Frequency-independent dipole

FIELD: physics.

SUBSTANCE: device is a dipole whose radiating arm lies over a passive arm (base) and on its opposite side there is a matching circuit in form of a parallel circuit consisting of two conductors connected in series and a capacitor. The common end of the capacitor of the circuit and one of the conductors of the matching circuit are connected to the radiating arm of the dipole through a coupling capacitor, and its other ends are connected to the outer side of the passive arm of the dipole, respectively. The arms of the dipole and conductors of the matching circuit are made from plates and capacitor elements are made from pieces of coaxial cable. Corresponding ends of the arms of the dipole and the matching circuit are connected via dielectric supports. Metal grids in form of cones, on whose apexes there is an antiradar plate, can be soldered to outer sides of the radiating arm of the dipole and conductors of the matching circuit.

EFFECT: simple design of the matching circuit, wider transmission band with low standing-wave ratio, directivity and noise immunity.

2 cl, 4 dwg

 

The invention relates to the field of radio, antenna-feeder equipment and can be used to build different types of frequency-independent radio and television aerials.

The use of the invention allows to build different types of frequency-independent radio and television antennas ratio of frequencies in the range of 20:1 with an SWR<2,5.

Antenna vibrator is a symmetric electric vibrator bearing shoulder which is over passive shoulder (bottom). Passive shoulder vibrator connected inner braided supply line in the form of a coaxial cable, and to the radiating arm of the vibrator - the inner conductor of the line and the capacity of the connection with a matching chain, made on the outer side of the passive arm of the vibrator in the form of a parallel circuit consisting of two conductors connected in series and capacitance of the circuit, the total end of it and one of the two conductors of a matching network connected to the opposite end of the vessel connection with radiating shoulder of the vibrator and the other end of the tank circuit and a matching circuit connected to the outer side of the passive arm of the vibrator.

The ends of the radiating arm of the vibrator and guide the matching circuits are connected to a passive shoulder with dielectric supports. To the outer side of the radiating arm of the vibrator and guides the matching circuit soldered metal mesh in the form of cones, inside the tops of which is a plate made of radar absorbing material.

Among the known vibratory antennas there is a wide variety of methods for their constructive execution, nutrition, balancing and reconciliation:

1. Rodionov V.M. transmission Line and antenna VHF. M: Energy. 1977, p.66-86.

2. Sazonov D.M. Antennas and microwave devices. M.: Higher school. 1988, s-250.

3. U.S. patent No. 2567235. Matching device for concerns antennas. NCI 343-851.

The lack of such vibrators - narrow bandwidth, due to the fact that the dipole is equivalent to the 2-wire line losses, open at one end (Sazonov D.M. Antennas and microwave devices. M.: Higher school. 1988, s-235), the input impedance of which is a periodic function of the arm length of the vibrator and the waves. However, depending on the ratio of these lengths input resistance equivalent series or parallel circuit, and when the offset occurs a significant reactive component of impedance, which leads to escapologist when negotiating supply line and a vibrator.

At the same time, the symmetric half-wave vibrator front beamwidths equal to the posterior lobe, which reduces noise and coefficient directional (G=1,64 or of 2.15 dB) (Rodionov V.M. transmission Lines and antennas of the criminal code is. M: Energy. 1977, p.64).

To increase the coefficient of directional apply Director of antennas and antenna type "wave channel", but they are still narrow and cumbersome devices.

To increase bandwidth used combination of Director antenna (log periodic antenna), while the overlap factor of the frequency range can be 10:1 when the CWS=2 (Sazonov D.M. Antennas and microwave devices. M.: Higher school. 1988 s-272).

Log periodic antennas are also quite complex and cumbersome devices. Closest to the proposed invention is a patent RU 2132587, IPC6H01Q 9/16.

In this invention to radiant shoulders symmetric electric vibrator through baluns and matching circuit connected coaxial line (power). Baluns and matching circuit is made in the form of a segment of cable with two conductors, which are connected in series at one end of the cut cable, but on the other end they are consistently included in one of the two conductors of the supply environment, which are connected to different arms of the vibrator, and the outer conductor to the shoulders of the vibrator is not connected. The overlap factor of the frequency range of 10:1 when the CWS=2,5.

Symmetrise and the matching device of the present invention has the following disadvantages:

1) to instructiona the complexity of implementation;

2) no galvanic connection of the outer conductor of a matching network with a vibrator;

3) an impedance of coaxial feed line is 50 Ohm.

The structural complexity of the matching network due to the need for connection of conductors with distributed parameters contained within the segment of cable, cable, power line, as well as simultaneous balancing and alignment vibrator. No galvanic connection of the outer conductor of a matching network with a vibrator leads to additional reactivity, which reduces the bandwidth negotiation.

Constructive performance simmetriya and matching network does not allow the use of a coaxial line power supply with an impedance of 75 Ohms, while the input impedance of electric vibrator at l/λ=0,25 (l is the geometric length of the forearm of the vibrator, λ is the wavelength) is approximately equal to 75 Ohms (Sazonov D.M. Antennas and microwave devices. M.: Higher school. 1988, s).

The aim of the invention is to simplify the design of a matching network, the greater bandwidth at a lower VSWR, ratio directional and noise immunity.

The aim is achieved in that the matching circuit is made in the form of a parallel circuit consisting of two conductors connected in series, the total geometric length of their men is higher λ/4, and capacity, the total end through which the tank is connected to the radiating arm of the vibrator, and the other ends of the tank circuit and a matching circuit connected to the passive arm of the vibrator, while the radiating arm of the vibrator is on passive shoulder of the vibrator (the Foundation). The conductors of the matching circuit and the shoulders of the vibrator is made of plates, to a passive shoulder which are connected the ends of the radiating arm and the conductor of the matching circuit with dielectric supports, and to the outer sides of the radiating arm of the vibrator and guides the matching circuit soldered the ends of the metal mesh, side of the cell which are 0, 1 λ min, in the form of cones, and their tops attached stealth plate.

This choice total geometric length of segments matching chain, made in the form of a parallel circuit provides compensation of amplitude-frequency characteristics of the vibrator with a periodic sequence changes its input resistance. Because the radiating arm of the vibrator is on his passive shoulder, it is similar to the coil antenna, which increases the ratio of directed action, and the absence of a eld over conductors radiating shoulder and a matching network allows the metal shield in the form of cones, soldered thereto, and the nalitch the e radioparadise plates inside them provides an absorbent passage concerns fluctuations useful source, and the outer side of the screen reflects concerns fluctuations other sources, which increases the noise immunity of the vibrator.

The invention is illustrated by drawings:

figure 1 - scheme of connection of the elements of the frequency-independent vibrator 1;

figure 2 - example of frequency-independent vibrator;

figure 3 - example of frequency-independent vibrator 2;

figure 4 - experimental frequency response VSWR:

(a) frequency-independent vibrator;

b) dipole.

The proposed device is frequency-independent vibrator (figure 1) consists of symmetric electric vibrator having two conductors: radiant and passive shoulder 1 shoulder (base) 2; a matching network of the two conductors connected in series, one end of the conductor 3 is connected to the outer side of the passive shoulder 2, and the other end 4 is connected with the radiating shoulder 1 of the vibrator through the capacity of the links 5 and respectively with the outer side passive shoulder 2 of the vibrator through the tank circuit 6.

Figure 2 and 3 shows examples of constructive perform frequency-independent vibrator in the air-strip design. Figure 2 shoulders 1, 2 symmetric electric vibrator and the conductors 3, 4 matching network with a total length of less than λ/4 made of plates (aluminum, steel), and the capacity of the links 5 and container of the feature contour 6 of the segments of the coaxial cable 50 Ohm, the geometric length of which is less than λ/4.

The power cable 7 (75 Ohm) connected to the ends of the arms of the vibrator, which are interconnected using a dielectric support 8, and their opposite ends are connected through the dielectric support 9.

Figure 3 frequency-independent vibrator is depicted with a shield made in the form of cones 10, 11 of the metal mesh, the cells of which are 0, 1 λ min Their ends soldered to the outer sides of the radiating shoulder 1 of the vibrator and the conductors 3, 4 matching chain.

At the vertices of the cones is a plate 12 of radar absorbing material. The transverse dimensions of the conductors (aluminum) matching network and the radiating arm of the vibrator is equal to (3×8) mm2and passive shoulder respectively (4×15) mm2provide acceptable value of their wave resistance (less than 300 Ohms) and remove from passive shoulder.

The dimensions of the dipole (150×760) mm2, a matching circuit (130×550) mm2. Figure 4 presents the values of the VSWR of the vibrator when the length of the concerns of the cable 7 m in range (20-1200) MHz. The overlap factor of the frequency range of the experimental frequency response of the frequency-independent vibrator is 20:1 with an SWR<a 2.5. The overlap in frequency dipole will be (52-100) MHz with an SWR<a 2.5. The use of the proposed frequency-independently researched and is independent of the vibrator allows you to cover the entire frequency range of domestic television and design of the vibrator antennas as the air-strip, and microstrip implementation.

1. Electric vibrator with the supply line in the form of a coaxial cable and a matching network of the two conductors connected in series, one end of which is connected to the arm of the vibrator, wherein the inner conductor coaxial line is connected to the radiating arm of the vibrator located above his passive shoulder (base), and on the other side of this shoulder is matching device made in the form of a parallel circuit, the total end of the tank circuit and one of the conductors of the matching circuit via the capacitance is connected to the radiating arm of the vibrator and the other end of the tank circuit is connected to a passive shoulder of the vibrator, which is also connected the ends of the radiating arm of the vibrator and the matching circuit using a dielectric supports.

2. The device according to claim 1, wherein the outer sides of the radiating arm of the vibrator and the conductors of the matching circuit is made in the form of plates, soldered metal mesh in the form of cones at the vertices of which is fixed a plate of radar absorbing material.



 

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