Microstrip series-fed linear array circularly polarized microstrip antenna

Abstract

The invention provides a microstrip series-fed linear array circularly polarized microstrip antenna and aims to provide a high gain, low axis ratio, wide band waveguide interface microstrip series fed antenna, the invention is realized by the following technical scheme: A surface copper coating on a dielectric substrate (2) is etch into a linear array microstrip metal radiation patch (5) connected in series with a microstrip string feed line (4) and a transition metal patch (8) connected with that microstrip string feed line, a rectangular coupling slots of corresponding transition metal patch and H-shaped couple patch (10) placed into the rectangular coupling slot (9) are etched on that metal floor of the lower surface layer of the dielectric substrate (2); Metal shield hole (6) penetrating that upper and lower surface of the dielectric substrates are arranged around of the rectangular coupling gap in an enveloping manner; The metal plate (1) is provided with a waveguide cavity (7)penetrating the metal plate; The circularly polarized microstrip antenna in which the transition metal patch, a rectangular coupling slot, an H-shaped coupling patch and a metal shield hole realize the electromagnetic wave transmission between the series feeder and the waveguide interface, and a microstrip metal radiation patch realizes radiation is formed. .

Description

technical field [0001] The invention relates to a circularly polarized microstrip antenna applicable to satellite navigation, radar and other field systems, in particular to a microstrip series feeder array circularly polarized microstrip antenna applied to the V frequency band. Background technique [0002] Circularly polarized antennas have unique anti-interference performance. The so-called circular polarization means that the end point of the electric field vector moves with time at a fixed position in space. If the trajectory formed by the motion is a circle, it is called circular polarization. It can be decomposed into two linearly polarized waves, which are orthogonal to each other, have the same amplitude, but are 90° out of phase. Compared with linearly polarized antennas, circularly polarized antennas have the following advantages: (a) Any linearly polarized incoming waves can be received by circularly polarized antennas, and any linearly polarized antenna can rec...

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Problems solved by technology

Although the coaxial line feeding can avoid the influence of the feeder line on the performance of the antenna, the processing process is more complicated and it is not easy to integrate; the microstrip line feeding adopts the coplanarity of the feeder line and the patch, which is easy to achieve impedance matching, and the structure is simple and low in cost, suitable for miniaturization The disadvantage is that the bandwidth is narrow; the electromagnetic coupling feed uses multiple feed points to feed, which is often used to solve the feed problem of multi-layer antenna arrays, but the feed circuit is usually more complicated, the cost is higher, and the size is larger

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