Double-polarized array

FIELD: microband microwave arrays for use in radars, microwave imagers, medical apparatuses, information receiving and transmitting systems.

SUBSTANCE: the radiators are positioned in the points of the hexagonal grid with a horizontal pitch determined by the required band of absence of the combination lobes in the directivity pattern, antiphase exciting elements of orthogonal linear polarizations are connected to the plate in antiphase on the orthogonal diagonals of the square.

EFFECT: reduced level cross-polarized components of the signal induced at polarizationally orthogonal outputs of the array for the band of electronic scanning exceeding +-45 deg.

3 dwg

 

The invention relates to a microstrip antenna arrays, microwave range and can be used in polarimetric radar, radioastronomy, medical electromagnetic applicators, systems transmit and receive information.

Known antenna arrays, microwave range, and their separate elements for reception of signals on orthogonal polarizations in polarimetric radar, radioastronomy, medical electromagnetic applicators, systems transmit and receive information - microstrip antenna arrays, RF patents №2156524, 2156525, publication date: 20.09.2000, Polarization diversity phased array cellular base station and associated methods. Sweden, patent No. 5724666, publication date: 11.05.95, Wide-band, dual polarized planar antenna, Japan, patent No. 5453751, publication date: 01.09.93.

As a prototype of the invention can be considered a patent of the Russian Federation: "Microstrip antenna array with polarization adaptation", patent No. 2156526, publication date: 20.09.2000. Proposed microstrip antenna array has an even number of emitters in the form of a rectangle that is placed in the nodes of a rectangular grid and separated by gaps. Average emitters four rays rectangular coordinate grid is made in the shape of a rectangle having one side equal to the wavelength, and the other, related parties is as equal to half the wavelength. On the middle line of the contact element of the secondary emitters are connected to the earth surface, the remaining emitters are made in the shape of a square with sides equal to the wavelength. Each secondary emitter at a point in the middle of a side edge connected to one end of the driving element, and the second ends are connected with the power distribution.

A common shortcoming considered analogs and prototypes is that effective interchange crosspolarization signal components induced in the orthogonal antenna elements, is achieved only in the position corresponding to the normal to the leaf antenna. When the deviation of the main beam of these antenna arrays from normal interchange crosspolarization signal components induced in the orthogonal antenna elements, significantly worsens and for a range of electronic scanning within ±45° not more than 10 dB, which is insufficient for most of the reported radio applications.

The positive effect of the present invention, which consists in reducing crosspolarization signal components induced in the orthogonal outputs of the antenna at different polarizations when the deviation angle of arrival waves from the normal range of electronic scanning over ±45° is achieved by the fact that the emitters have the camping on the nodes of a hexagonal grid with a horizontal step, define the required range of the absence of Raman petals in the BOTTOM, and the emitter uses a square plate, antiphase stimulating elements orthogonal linear polarizations which are connected to the plate pairs are in opposite phase with respect to orthogonal diagonals of the square.

An example embodiment of the invention shown in figure 1:

The numbers mark:

1) a square plate - planar emitters offer HEADLIGHTS;

2) orthogonal pairs of opposite phase activated point elementary excitation of planar emitters offer the HEADLIGHTS.

To check the radiation characteristics of the proposed HEADLIGHTS at the first stage was made layout sublattice of the seven radiators located on the nodes of a hexagonal grid with step 135 mm in the horizontal plane, with the circuit shown in figure 1, a single emitter grid had dimensions 86×86 mm and four point anti-phase excitation, located at a distance of 15 mm from the center of the plates.

Figure 2 and 3 shows the experimentally measured BOTTOM on the main and spurious polarizations chetyrehhodovogo emitter (two inputs for the excitation of each of the orthogonal polarization component) as part of HEADLAMP when scanning in the H and E planes, respectively. On X axis is the angle relative to the normal to the plane and the Tenna, Y - signal level in dB relative to the signal level along the normal to the antenna.

The planar antenna array of dual polarized, containing the emitters in the form of a rectangle placed over the conductive surface and connected to the exciting elements, characterized in that the emitters are located at the nodes of a hexagonal grid and executed in the form of square plates deployed at an angle of 45° with respect to the axes of a hexagonal grid, and antiphase stimulating elements orthogonal linear polarizations are connected to each emitter pairs are in opposite phase with respect to orthogonal diagonals of the square.



 

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FIELD: microband microwave arrays for use in radars, microwave imagers, medical apparatuses, information receiving and transmitting systems.

SUBSTANCE: the radiators are positioned in the points of the hexagonal grid with a horizontal pitch determined by the required band of absence of the combination lobes in the directivity pattern, antiphase exciting elements of orthogonal linear polarizations are connected to the plate in antiphase on the orthogonal diagonals of the square.

EFFECT: reduced level cross-polarized components of the signal induced at polarizationally orthogonal outputs of the array for the band of electronic scanning exceeding +-45 deg.

3 dwg

FIELD: microwave radio engineering; radar frequency-controlled antennas.

SUBSTANCE: proposed antenna is made in the form of flat array of linear radiators connected to power splitter in the form of sine-wave configured line. Components coupling power splitter with linear radiators are divided at antenna input into two groups so that longitudinal axis incorporating all even-numbered coupling members is offset relative to axis incorporating all odd-numbered coupling members by integer odd number of quarter-wavelengths in sine-wave line of power splitter. Phase mismatch occurring in this case is compensated for by respective difference in input section lengths of even- and odd-numbered linear radiators.

EFFECT: reduced space requirement, improved matching and performance characteristics of antenna and radar as a whole.

2 cl, 2 dwg

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

3 cl, 5 dwg

FIELD: the invention refers to the field of radio technique namely to antenna technique.

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4 cl, 7 dwg

FIELD: radio engineering; radio direction finding and radio communication systems.

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1 cl, 30 dwg, 2 tbl

FIELD: short-range radio communication and radar systems.

SUBSTANCE: proposed method includes storage of electric field potential by means of storage capacitor, avalanche discharge of storage capacitor, reception and radiation of electromagnetic wave by means of receiving-radiating element, concurrent generation, transmission, and radiation of pulsed signals. Electric field potential is stored by storage capacitor simultaneously with its storage at receiver input from current waves formed by pulses of receiving electromagnetic wave across two separated conductors of transceiving element; avalanche discharge of storage capacitor is conducted simultaneously with generation of current waves in same conductors producing radiated electromagnetic wave pulse. Device implementing proposed method has sawtooth current pulse generator connected to storage capacitor, avalanche diode, receiving-radiating element, and receiver. Receiving-radiating element is made in the form of two separated conductors shorted out on one end; they are series-connected with avalanche diode and storage capacitor at input and parallel-connected with receiver input through controlled limiter.

EFFECT: enhanced antenna efficiency and gain, as well as noise immunity, reduced power loss.

4 cl, 2 dwg

FIELD: antenna engineering.

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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.

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4 cl, 3 dwg

FIELD: microwave radio engineering; radars.

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6 cl, 2 dwg

FIELD: physics.

SUBSTANCE: invention refers to antenna engineering and can be used for production, at manufacturing plants, of dipole, phased or digital arrays (A) for signal reception/transfer within VHF range with various polarisation within wide single-beam scanning sector, that is in production period and cost, less by a factor of ten than production of conventional large-dimensioned arrays. The invention consists in that design of ready-to-operate array includes carrying submodule trusses whereon are fixed and galvanic ally coupled in either square or orthogonal curtain the identical prefabricated antenna modules representing vibrator arrays of coherent parameters, with orthogonal arms (cross-vibrators) inclined at an angle 45° to screen plane of single standard dimension-type, with arm length of horizontally polarised vibrator Lhor=0.463λo and vertically polarised vibrator Lvert. = 0.452λo, their height being equal h=0.226λo over conducting screen. Cross-vibrators are placed in array curtain along triangular mesh in the form of isosceles triangles with angularly placed vibrators, coordinate distances between their columns being dx=0.45λo and between their lines dy=0.32λo. Array is calibrated by experiment-calculated method with scattering matrix evaluation and VSWR calculation within its small fragment from 37 cross-vibrators of adjustable dimensions for fine adjustment until optimum dimension-type of required VSWR is attained. To provide ready-to-assembly array in-site in short terms, fit-up and adjustment of array curtain is carried out at a manufacturing plant.

EFFECT: extended scanning sector with matching of completely built-up array within whole scan sector up to ±60° at considerably reduced of time of array calibration and its setting into operation.

5 cl, 4 dwg

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