Miniature low-profile broadband dual-circular-polarization microstrip antenna

Abstract

The invention discloses a miniature low-profile broadband dual-circular-polarization microstrip antenna.The antenna is composed of a first dielectric substrate, a metal supporting frame, a second dielectric substrate and a third dielectric substrate.Parasitic metal surface-mounted devices are arranged on the upper surface and the lower surface of the first dielectric substrate, the surface-mounted device on the upper surface is larger than the surface-mounted device on the lower surface in size, and the surface-mounted devices are connected through four metalized through holes; a feed surface-mounted device is arranged on the upper surface of the second dielectric substrate; the third dielectric substrate comprises four strip lines, a 90-degree bridge, two feed probes and two radio frequency coaxial connectors.The 90-degree bridge and dual-feed technologies are adopted for realizing dual circular polarization, a laminated structure and a dual-parasitic surface-mounted device structure connected through the metalized through holes are adopted comprehensively to expand the bandwidth of the microstrip antenna, so that the bandwidth of the antenna reaches 19.4%, and the circular polarization ratio within the frequency band range is smaller than 1.3 dB; the antenna has miniature low-profile characteristics, and the size is 0.45 lambda0*0.45 lambda0*0.075 lambda0.

Description

technical field [0001] The invention relates to antenna technology in the field of communication and navigation, in particular to a miniaturized low-profile wide-band dual circularly polarized microstrip antenna. The invention is suitable as an array element of a phased array antenna, so it is suitable for occasions requiring relatively high bandwidth and circular polarization performance in vehicle-mounted, airborne and other low-profile satellite mobile communications. Background technique [0002] Microstrip antenna has the advantages of low profile, light weight and low cost, etc., but its inherent narrow-band characteristics (generally less than 5% relative bandwidth) limit its application range. People have adopted many techniques to widen the bandwidth of the microstrip antenna, such as the use of irregular metal patch, laminated structure and other measures. However, it is difficult to design with irregular metal patches, and often affects the polarization performan...

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Problems solved by technology

[0003] After patent retrieval, the relevant patents closely related to the present invention are as follows: Patent No.: CN200810114878.2, circular polarization broadband capacitance compensation probe feed stacked microstrip antenna array, through stacked structure and capacitance compensation probe technology Achieved a standing wave bandwidth greater than 20%, but only achieved single circular polarization; patent number: CN201010521963.8, a single-feed wideband circularly polarized laminated microstrip antenna and its feeding device, realized through a laminated structure 15.6% of the 3dB axial ratio bandwidth, and the antenna height > 0.14λ 0 ;Patent No.: CN201310444387.5, UHF frequency band dual-band circularly polarized low-profile air microstrip antenna, capable of dual-band operation, without broadband characteristics; Patent No.: CN201420045812.3, high-bandwidth dual-polarized microstrip antenna, The working frequency ba...

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