Active antenna with compensation (its variants) and antenna array composed of active antennas with compensation

FIELD: antenna engineering, possible usage as receiving antennas in radio broadcasting, radio communications and radio direction finding.

SUBSTANCE: antennas consist of working electrode, connected to input of antenna amplifier, isolated compensating electrode, connected to additional output of amplifier and positioned between working electrode and counterweight. On compensating electrode, signal transfer coefficient close to one in terms of voltage is provided for relatively to working electrode. Various elements of surface shape may be used as working electrode. Antenna array consists of N≥1 pairs, working electrodes of which are connected to inputs of amplifiers, and compensating electrodes - in crisscross manner and mutually are connected to additional outputs of amplifiers of pair. On these outputs, signal transfer coefficient by voltage relatively to working electrode close to one is enforced.

EFFECT: high frequency receipt mode, high efficiency of antenna array.

3 cl, 5 dwg

 

The invention relates to the field of radio, namely antenna technique and can be used as foster electrically short antenna in radio broadcasting, radio communication and radio. Owing to their small size, the frequency selectivity of the current height, simple tastes to the purity of the antenna insulator and one-pointedness of the receiving part of the antenna array, they can be used in portable receiving devices, and equipment for receiving and direction finding sources for vehicles and aircraft.

Known for the design of the active whip antenna having a working electrode in the form of a steel pin length 0.4 m, mounted separately in the vehicle and connected to the input of a broadband antenna amplifier (Zybaev astray freight, Novels BS Antenna amplifiers. The owls. Radio, M, 1980). The antenna was designed to work with car receivers of all makes and receives radio stations with the AM bands LW, MW, KB and FM in the range of VHF. This type of antenna belong to electrically short antennas, since the wavelengths of the received signals significantly exceeds their geometrical dimensions, and so they work as a resonant capacitive probes. Their impedance is capacitive and is determined by the capacitance of the working electrode relative against the weight. As a working electrode are insulated pins, as well as the surface structure in the form of discs, parts of the counterweight or different structural elements above the counterweight. The sensitivity of such antennas as the number of its actual height h∂ provides or increase their size, or of elevating the working electrode above the counterweight, which leads to overloading of the input circuits of the antenna amplifiers from intensive out-of-band signals, as well as to the deterioration of their performance. In the upper part of the UHF broadcasting band length pin of the antenna becomes comparable with the length of the received waves and begins to manifest itself as a resonant array antenna. Hence its h∂ becomes frequency-dependent, which narrows the channels of effective reception. Approval for the antenna is provided by connecting it to the antenna amplifier having low input capacitance and a large input impedance, which places high demands on the material and clean the surface of the antenna insulator.

Closest to the claimed devices to the technical nature of an active antenna with compensation (RF Patent No. 32324, IPC H 01 Q 23/00, Appl. 12.05.03, publ. 10.09.03. Bull. No. 25). Is the electrical pin connected to the input of the antenna condition the amplifier around the base of which in isolation is a compensating electrode in the form of a cylinder, connected to the antenna output of the amplifier operating in repeater mode voltage, and around the lower part of the compensating electrode is a screen in the form of a cylinder, connected to the counterweight.

This antenna design is not susceptible to the quality of the insulator, because the way of current leakage between the working electrode and the counterweight is closed compensating electrode potential equal. The same currents leakage between the compensating electrode and the counterweight does not have a shunting effect on the output of the antenna amplifier, so as to flow parallel to the low impedance output impedance of the voltage follower. By eliminating the displacement currents in the lower hemisphere of the working electrode with compensation increases its current height h∂(f) compared to the same antenna, but without the compensating electrode. This increase occurs in the frequency range, which is provided on the presence of compensating electrode antenna amplifier gain voltage close to unity, concerning the work. This allows you to make small antenna and reduce out-of-band signals, which leads to reduction of the nonlinear interference of the third order,i.e. the type fP1=2f1-f2or fP2=2f2-f1(where f1and f2- frequency interaction of which have products of harmonic distortion third order fP1and fP2).

The disadvantage of such constructions antennas with compensation is the high frequency limit. So, having a single output at the antenna amplifier and repeater mode voltage do not allow for the necessary concurrent approval as a compensating electrode, and a connecting line that goes to the receiver. At high frequencies is also noticeable phase foray into the presence of compensating electrode, insertion of the connecting line, which was not considered in the prototype. It is also necessary to take measures to reduce the mutual capacitance between the working and compensating electrodes, and a compensating electrode and the counterweight.

Known antenna array consisting of omnidirectional in the azimuthal plane passive whip antenna elements of the lattice (Azithromcin, Antenna-feeder devices. M.: Izd-vo Communication, 1977). The power of the grating elements may be serial or parallel circuit. To ensure the required sensitivity of the antenna array based compensation loss for approval pins reactive elements with connecting cable and sweat the R in the cable sizes get quite large. Broadband antenna array in the lower frequency depends on the interaction of its elements. Than habarane working electrodes and less than the distance between them in the structure of the lattice, the more this factor. Thus, when the distance between adjacent elements is less thanλ/3increases the interaction between them, resulting in the reduction of the gain grating and worsen its directional properties. There are also difficulties in ensuring its bandwidth with the approval of the working electrode with connection cable in the high frequencies. In the case of difficult weather conditions the efficiency of the elements in an antenna array depends on the condition of the surfaces of the antenna insulators. Arrays of passive whip antennas have a low coefficient directional (KND) and the ambiguity of bearing on the source of the received signal.

Antenna array-prototype consists of N, where N>1 identical active whip antenna connected to the antenna inputs of the amplifiers, and the outputs connected to the inputs of the adders in a parallel circuit (Vulgarthon, Vntrs, Ceglinski, Uthmanic. Active phased arrays, M.: Radio and Communication, 1993, p.160). As mentioned above, the elements of this lattice are very sensitive to the quality of the antenna insulator, and to overload the antenna gain is residents from intensive out-of-band signals. Despite the smaller pins compared with passive antennas, the interference between them at low frequencies is stored, which degrades the characteristics of the lattice. Antenna amplifiers is provided broadband agreement between the capacitive output pin and a high-impedance input of the amplifier, but remains low KND, ambiguity bearing and dependent on the quality of the antenna insulator.

The purpose of these inventions is to develop elements of the antenna array in the form of active antennas with compensation, providing for the extension of the operating range in the high frequency region and construction on the basis of these elements of the antenna array with a higher value KND, unambiguous bearing to the signal source, reducing dependence on quality antenna insulators and increase noise immunity from intensive out-of-band signals.

The goal for the elements of the antenna array in the form of active antennas with compensation is achieved in two declared variants. However in common with the prototype features are the presence of working electrically "short" electrodes which are connected with inputs of antenna amplifiers, isolated compensating electrode, using the main output of the antenna amplifier and the counterweight.

In the antenna according to the first variant, containing as a working e is ectrode pin, connected to the input of the antenna amplifier, the compensating electrode, the main output of the antenna amplifier and power, unlike the prototype compensating electrode is placed around the lower part of the worker, between its side surface and the counterweight, and is connected to the secondary output of the antenna amplifier, which together with the connection provides compensative electrode transfer ratio of the signal voltage, relative, close to unity. In one particular case, a compensating electrode is made in the form of a cylinder and is located around the lower part of the pin, and in another case, a compensating electrode is made in the form of a disk and is located on the counterweight around the base of the pin. Also, in special cases can be used several additional outputs antenna amplifier with appropriate radiotracking to them, and attached to the compensating electrodes, which can also be manufactured and even mesh. The effectiveness of compensation depends on the uniformity of the strength distribution received field on the perimeter of the compensating electrode, so that during its manufacturing net it is desirable to have the perimeter of the continuous conductor.

In the second case the goal is achieved the same way as in the first, the differences are only in the desktop and compens the dominant electrodes. As a working electrode used here surface forms, which in special cases include disks, parts of the counterweight or different structural elements above the counterweight. Compensating electrode is determined by the work, and it also has a surface shape and is located between the working electrode and the counterweight. In addition to the individual cases, the first option is that the working electrode may also be a mesh or cutout.

The goal in an antenna array is achieved by the fact that in the known antenna array, consisting of N≥1 pairs of active antennas, in which the electrodes are connected to the inputs of the antenna amplifier and the main amplifier outputs connected to the inputs of the adders of the voltage, the outputs of adders for N>1 are summarized further in the parallel scheme, unlike the prototype, each active antenna further comprises between the working electrode and the opposed compensating electrode, and mutually cross-connected to an additional output of the antenna amplifier, the other pair of antennas, the transmission factor of the signal voltage on the secondary output antenna amplifier, relative to the working electrode, close to one.

In particular cases as working electrodes are used pins, discs, part of the counterweight or construction the e elements, located above the counterweight, the shape of the compensating electrodes are determined by the workers. For the case of the provision in the proposed lattice of one-way admission to the inputs of the adders are set driven keys, shorting command input signals on the counterweight.

The introduction of additional output from the antenna amplifier and the rejection of his work in repeater mode voltage allows to provide on the presence of compensating electrode transfer coefficient voltage is close to unity at higher frequencies. Increasing the gain of the voltage also allows you to match the amplifier to the output cable, and also to compensate for the loss in it. Further, at high frequencies is invalid phase shift in the connection to which compensate the electrode, therefore, would require a transfer ratio close to unity, directly on the presence of compensating electrode. The presence of mutual capacitance between the working and compensating electrodes, and between the compensating electrode and the opposed lead at high frequencies to invalid phase lag of the voltage on the presence of compensating electrode relative to the work. To reduce the mutual capacitance in private cases, a division of compensatory electrogena segments with their separate connection to several additional outputs of the antenna amplifier. Each additional output of the amplifier is accordingly your path. For this purpose it is possible to manufacture a working electrode (the second option) and the compensatory and the area of contrast, adjacent to which compensate mesh materials.

Thus, in both cases, the active antennas with compensation provides the same result is fundamentally the same way, and that led to the unification of these two technical solutions as two options in one application.

Antenna array, which is made on the basis of such active antennas with compensation, is becoming less dependent on the quality of the antenna insulators and high levels of out-of-band signals, is expanding its frequency response at low frequencies and improves its KND. Cross-connection of the compensating electrodes to additional outputs antenna amplifiers in pairs allows to improve the Directive gain of the antenna array in the case of the perpendicular position of the main maximum of the directivity diagram (NAM), and at the longitudinal location of the maximum of DN to get in the particular case of unidirectional signals. This is because in addition to the phase difference between received signals from the main outputs of antenna amplifiers pairs defined by the angle of incidence of the field θ and the value of RA the nose of working electrodes d, change the amplitude of these signals. In fact, if identical working electrodes, as well as the frequency response and phase characteristics of the antenna amplifiers the signal amplitude at work and compensating electrodes in the pair will be the same, but different phases. This phase difference is determined by the angle θ in the azimuthal plane relative to the normal to the grating; the relative step size of the antenna array d/λ; relative phase velocity of the n=c/Vcdistribution of signals Vcin the connecting lines connecting the compensating electrodes cross and mutually with the additional outputs of the pair of antenna amplifiers and their lengths l. In this regard, when the angle θ will change the phase relation of the voltage between the working and compensating electrodes, and this leads to variations in the currents between them, which leads to the change of their output voltages.

The claimed device is illustrated by drawings on which is shown: figure 1 - General view of the antenna in the first embodiment for the case of the compensating electrode in the form of a cylinder; figure 2 - General view of the antenna according to the second variant for the case of the working electrode in the form of a disk; figure 3 equivalent circuit of the antenna array; 4 - DN antenna array on the main outputs of antenna amplifiers pair in transverse and longitudinal position of the main peaks; figure 5 - day prototype and allenou antenna array at the output of adder pairs.

The antenna in the first embodiment (see Fig 1) consists of a working electrode 1 in the form of a pin that is connected to the antenna input of the amplifier 2, the isolated compensating electrode 3 in the form of a cylinder and located around the bottom of the work, between its side surface and a counterweight 4, connected to the secondary output of the amplifier 2. On the lower part of the compensating electrode 3 is the screen 5 in the form of a cylinder, connected to the counterweight 4. Between the work 1 and enclosure 3 electrodes is an insulator 6, and between the compensating electrode 3 and the screen 5 is an insulator 7. Amplifier 2 is grounded on the counterweight 4, and with its main output an amplified signal using a shielded connectors is supplied to the input of the receiver. If necessary, work 1 and 3 compensating electrodes, and the screen 5 can be made telescopic design.

The antenna according to the second option (see figure 2) consists of a working electrode 1 in the form of a disk connected to the antenna input of the amplifier 2, the isolated compensating electrode 3 is also the surface shape in the form of a disk, in the particular case he has boards that cover working with 1 ends, and connected to the secondary output of the amplifier 2. In the particular case of the counterweight 4 has a recess 5, the aperture of which by means of insulators 6 and 7 is exeroise system of electrodes 1, 3. From the main amplifier output 2 signal using shielded connectors is supplied to the input of the receiver.

The operation of the antenna by the first and second options is as follows. Electric accept field induces on the working electrode 1 (see Fig 1 and 2) certain potential that is input to the antenna amplifier 2. With the additional output of the amplifier via a connecting line on the presence of compensating electrode 3 is formed, the signal voltage equal to the input amplitude and in-phase with him in the operating frequency band. In this case, between the electrodes 1 and 3 capacitive and galvanic currents will be missing, and the native capacity of the antenna is formed in only the upper part of the working electrode 1, which leads to an increase in its current height. For signals outside the bandwidth of the amplifier through a compensating electrode 3 opposed to 4 will flow bias currents, the shunt working electrode 1. Thus, e is generated by frequency-dependent h∂(f) already at the input of the amplifier 2. The use of antenna amplifier 2 with gain greater than unity allows you to provide on the presence of compensating electrode 3 effect of correlation at higher frequencies and coordination main output cable going to the receiver. Measures have also been taken to reduce the EOI is alot of tanks between the work 1 and enclosure 3 electrodes, and between the enclosure 3 and the counterweight 4 at high frequencies. In private cases, there are several compensating electrodes 3, the connecting lines and additional outputs antenna amplifier 2, as well as production work, the compensating electrodes and counterweight underneath the mesh.

The equivalent circuit of an antenna array consisting of a single pair of antennas N=1 according to the second variant, shown in figure 3. Working electrodes in the form of discs 1 and mitigation in the form of disks with flanges 3 are located in the aperture deepening of the counterweight 4 and connected to the antenna inputs of the amplifiers 2 and through the connecting lines 8 - additional outputs 9 pairs of antenna amplifiers 2, respectively. With the main outputs of the amplifiers 2 signals are fed to the inputs of the adder 10. From the adder 10 is removed, the output signal of the antenna array, and when N>1 summation with other pairs of lattice occurs on additional adders in a parallel circuit. In the particular case to implement unidirectional receiving antenna array at the inputs of the adders are the keys 11, which teams are shorting on the case corresponding inputs of the adder 10.

The claimed antenna array operates as follows (see figure 3). Falling on the grating at an angle θaccepted field induces on the working electrode in the form of discs 1 certain is that the potential of the signal U with. Each additional outputs 9 of the amplifier 2 is formed by a voltage equal to the input amplitude and phase for each amplifier. Then these stresses in cross-pair is transmitted to the compensating electrodes 3 lattice. Depending on θd/λ, n and the length l of the connecting lines 8 between the work 1 and enclosure 3 electrodes a potential difference appearswhere Δϕ the phase difference between the signals on the electrodes. Hence h∂(f)maxeach antenna will be at ΔU=0, and h∂(f)minwhen ΔU=2Uwith. In the case of fixed valuesd/λn and l will be the dependence of the effective antenna heights not only on frequency but also on the angle of incidence of the fields in the form h∂(f, θ), that is, the elements of the lattice acquire dependence on θ with the main outputs of antenna amplifiers. Selecting appropriate valuesd/λ, n and l, it is possible to obtain the position of the main maximum in the bottoms of the pair of antennas both lengthwise and across the antenna array. When the longitudinal position of the main maximum element of the lattice in the form of a capacitive probe acquires a unique feature of one-way reception, the ability to receive from the opposite direction is reduced about three times. This is achieved by shortages of the respective inputs of the adder 10 is omashu keys 11 on the counterweight. When the transverse position of the main peak remains ambiguous reception in the form of two equal angles differing by 180°. Then received and amplified signals from the main antenna outputs of the amplifiers 2 are summed at the adder 10. As is known, the sum of signals takes into account the amplitude and phase of input voltages. In the proposed lattice amplitude at the inputs of the adder 10 is determined by the dependence of h(f, θ), and phase depend on θ andd/λ. As a result, the transverse acceptance DN lattice has expressed a pointed shape with KND more than the prototype. Further summation of the signals from the other antenna pairs is carried out on the parallel scheme.

Industrial applicability and benefits of active antennas with compensation (options) confirmed by comparative tests.

In the first embodiment was used pin and a compensating cylinder with a height of 0.3 m and 0.1 m above the counterweight, respectively. When connecting the compensating electrode to the secondary output of the antenna amplifier compensatory increase the existing height of the antenna Δh=h(f)-h∂ remained until the frequency of 108 MHz, and in the schema of the prototype corresponds to the frequency of 47 MHz.

The second option, as the working electrode used in the disk diameter is ω 0.22 m, and compensating with a diameter of 0.25 m and placed flush in the aperture of the opposed recess of 0.08 m With this design, the antenna was measured h(f)=0,11 m with the upper receive frequency 88 MHz, and the prototype of 25 MHz. In the particular case we used the partitioning of the compensating electrode into two equal segments, as well as making them net and connect to two additional identical outputs antenna amplifier with separate radiotracking to them. If this had been an increase in the upper frequencies up to 105 MHz.

The claimed antenna array, consisting of active antennas with compensation, calculated the values of d/λ in the range of 0≤d/λ≤1.0 for transverse and longitudinal acceptance, at different values of n and equality grating spacing the length of the connecting line d=l. So for n=1.2 and 2.0 the values d/λ to cross (0,0; 0,83) and (0,0; 0,5; 1,0), longitudinal (0,0; 0,45; 0,83) and (0,0; 0,33; 0,66; 1,0) positions of the main maxima, respectively.

As a two-element lattice was used antennas with surface forms of working electrodes in the form of discs (the second option), see figure 2. Figure 4 shows the NAM on the main outputs of antenna amplifiers for control reception d/λ=0.5 and longitudinal d/λ=0,33, curves 1 and 2, respectively, with n=2.0 and d=l. From figure 4 it is seen that DN in poperen the th 1 has expressed a pointed shape, and with longitudinal 2 observed unidirectional techniques, with a maximum of unidirectional reception of the source signal corresponds to the antenna, which is closer to the source, and the far antenna maximum directed in the opposite direction. When applying the received signals to the inputs of the adder 10, the output DN is undergoing changes and is shown in figure 5. It is evident that the bottoms of the transverse 1 no reception with the longitudinal direction in comparison with the bottoms of prototype 2 in the stated lattice KND much higher. For longitudinal reception 3 d/λ=0,33 due to the masking effect of the adder NAM approaching circular and becomes circular when d/λ=0.0 or 1.0.

In the particular case when implementing unidirectional reception provided by the managed keys 11, see figure 3, through which, if necessary, eliminated the masking feature of the adder 10 pairs for longitudinal reception. Thus, by using the antenna grid of multiple pairs of its elements N≥2, intersecting in the middle part, you can use the keys 11 are electrically oriented NAM grid in azimuth in the right direction, regardless of the actual position of the lattice in space. The evaluation showed that optimizing the lattice parameters of unidirectional reception is implemented in the frequency range from 30 to 100 MHz.

Check critically the th lattice work on the quality of the antenna insulators of its elements was simulated by shortages of working 1 and 3 compensating electrodes, see 1, 2, 3 a resistance of several kilo-ohms, while not recorded a marked decrease in the signal from the main amplifier output, but the same procedure with the prototype will significantly reduce the signal level.

1. Active antenna with compensation, containing isolated working electrode in the form of electrical pin connected to the antenna input of the amplifier, insulated compensating electrode, the output of the antenna amplifier and the counterweight, wherein the compensating electrode is placed around the lower part of the working electrode between its side surface and a counterweight attached to the secondary output of the antenna amplifier, which together with the connection provides compensative electrode transfer coefficient voltage on the working electrode, close to one.

2. The antenna according to claim 1, distinguish fact that the compensating electrode is made in the form of a cylinder and covers the lower part of the pin.

3. The antenna according to claim 2, characterized in that the compensating electrode on the outer side has a screen in the form of a cylinder, which covers the lower part and connected to the counterweight.

4. The antenna according to claim 1, characterized in that the compensating electrode is made in the form of a disk and is located on the counterweight around the base of the working electrode.

5. The antenna according to claim 2 to 4, characterized in that manservisi electrode, the screen and the surface of the opposed, adjacent to which compensate electrode made of a mesh all, or individually, or in combinations thereof.

6. The antenna according to claim 5, characterized in that the perimeter of the mesh electrode and the screen is made solid.

7. The antenna according to claim 1, characterized in that the compensating electrode is divided into segments with a separate connection to several additional outputs antenna amplifier, with each additional amplifier output has accordingly its path.

8. Active antenna with compensation, containing isolated working electrode in the form of a surface element connected to the input of the antenna amplifier, insulated compensating electrode, the output of the antenna amplifier and the counterweight, wherein the compensating electrode is located between the working electrode and a counterweight attached to the secondary output of the antenna amplifier, which together with the connection provides compensative electrode transfer ratio of the signal voltage on the working electrode, close to one.

9. Antenna of claim 8, wherein the working electrode is used, the disk portion of the counterweight or structural element above the counterweight.

10. Antenna of claim 8, wherein the compensating electrode is made with b the mouths on edges and covers the working electrode and bottom ends.

11. Antenna of claim 8, characterized in that the working and compensating electrodes arranged in the aperture deepening counterweight or in its hole.

12. Antenna of claim 8, characterized in that the working electrode, a compensating electrode and the surface of the opposed, adjacent to which compensate electrode made of a mesh all, or individually, or in combinations thereof.

13. The antenna according to item 12, wherein the perimeter of the mesh electrode is made of a solid.

14. Antenna of claim 8, wherein the working electrode has a surface cut.

15. Antenna of claim 8, wherein the compensating electrode is divided into segments with a separate connection to several additional outputs antenna amplifier, with each additional amplifier output has accordingly its path.

16. Antenna array of active antennas with compensation consisting of N≥1 pairs of active antennas, each antenna provides a stand-alone working electrode connected to the input of the antenna amplifier, the outputs of the antenna pair of amplifiers connected to inputs of adder stress and counterweight, wherein the active antenna is optionally and independently contain between the working electrodes and the opposed compensating electrodes that are interconnected with additional outputs antennapedia another pair of antennas, and the gear ratio of the signal voltage on the secondary outputs of these antenna amplifiers on their workers electrodes close to one.

17. Antenna array according to item 16, characterized in that as a working electrode using an electric probe.

18. Antenna array according to 17, characterized in that the compensating electrode is made in the form of a cylinder and covers the lower part of the pin.

19. Antenna array according to 17, characterized in that the compensating electrode on the outer side has a screen in the form of a cylinder, which covers the lower part and connected to the counterweight.

20. Antenna array according to item 16, wherein the compensating electrode is made in the form of a disk and is located on the counterweight around the base of the working electrode.

21. Antenna array according to item 16, wherein the working electrode is superficial element in the form of a disk, part of the counterweight or structural element above the counterweight.

22. Antenna array according to item 21, wherein the compensating electrode surface element is designed with flanges at the edges and covers his bottom and ends.

23. Antenna array according to item 21, wherein the working and compensating electrodes arranged in the aperture deepening counterweight or in its hole.

24. Antenna array p is item 21, characterized in that the working electrode has a surface cut.

25. Antenna array on PP, 19, 21 and 22, characterized in that the surface of the opposed, adjacent to which compensate the electrode, screen, working, and compensating electrodes made of mesh all, or individually, or in combinations thereof.

26. Antenna array on A.25, characterized in that the perimeter of the mesh electrode is made of a solid.

27. Antenna array according to item 16, wherein the compensating electrode is divided into segments with a separate connection to several additional outputs antenna amplifier, with each additional amplifier output has accordingly its path.

28. Antenna array according to item 16, wherein the inputs of the adders are set driven keys, shorting the corresponding input signals.



 

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4 cl, 2 dwg

FIELD: antenna engineering.

SUBSTANCE: proposed device has radio-transparent insulating layer and helical components forming lattice structure which are equally spaced apart therein. Axes of all helical components are positioned unidirectionally and lie in insulating layer plane; axis and ends of each helical component form plane perpendicular to direction of reflected wave propagation. Each helical component has following characteristics: Nt turns and helix pitch angle α found from formula where α is angle of helix pitch angle; Nt is turn number of helical component. Length of conductor forming helical component equals half the length of electromagnetic wave.

EFFECT: ability of transforming linearly polarized electromagnetic wave into circularly polarized wave irrespective of plane position of incident linearly polarized electromagnetic wave at desired direction of incident wave propagation.

3 cl, 4 dwg

FIELD: microwave radio engineering, route surveillance radars.

SUBSTANCE: proposed antenna arrangement incorporating power splitters and array of waveguide-slot stripline radiators (strips) has its power splitter disposed in plane parallel to that incorporating strips; it is made in the form of E-plane folded serpentine waveguide that has coupling members with strips. Power splitter longitudinal axes incorporating even- and odd-numbered coupling members with strips are spaced apart through integer odd number of quarter-wavelength in power splitter waveguide. Power splitter waveguide line section between adjacent coupling members is twice bent through 180 deg. and its length is chosen to be a multiple of integer odd number of half-waves in power splitter waveguide. Even- and odd-numbered strips are different in length. Half-wave phasing section affording phase shift required for matching even- and odd-numbered outputs of power splitter is inserted in input section of each strip by changing size of strip waveguide wide wall.

EFFECT: reduced level of side lobes, standing-wave voltage ratio at normal-frequency power splitter input, enhanced amplifier gain, directive gain, and antenna sheet surface utilization factor.

4 cl, 3 dwg

FIELD: microwave radio engineering; radars.

SUBSTANCE: proposed antenna array incorporating power splitters and array of waveguide-slot stripline radiators (strips) has its power splitter made in the form of two boards; it has slow-wave structure in the form of E-plane folded serpentine waveguide and members providing coupling with strips. Coupling members are essentially coupling windows and matching projections. Coupling windows are made in waveguide narrow wall of one power splitter plate and matching projections, against coupling members on other waveguide narrow wall of other power splitter plate. Power splitter longitudinal axes incorporating even- and odd-numbered strip coupling members are spaced apart through integer number of quarter-wavelengths in power splitter waveguide. Each strip is essentially rectangular waveguide whose narrow wall has alternately inclined slots. Even-numbered strips have their slots inclined in specular direction relative to that of odd-numbered strip slots and difference in lengths of even- and odd-numbered strips equals amount of displacement of power splitter longitudinal axes.

EFFECT: reduced side-lobe level and standing-wave voltage ratio at normal-frequency power splitter input, amplifier gain, directive gain, and antenna sheet utilization factor.

6 cl, 2 dwg

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