Dual-band Broadband Patch Circularly Polarized Antenna

Abstract

The invention discloses a dual-frequency broadband patch circularly polarized antenna, which includes a dielectric plate and a copper-clad metal ground. Four dual-frequency monopole radiation patches and a feeding network are arranged on the dielectric plate. The four dual-frequency monopoles are The radiation patch is connected to the four ports of the feed network in turn. The feed network includes a coaxial connector, a first dual-frequency coupler and a second dual-frequency coupler. The signal line of the coaxial connector is connected to the first dual-frequency coupler. The input end of the coaxial connector is connected to the input end of the second dual-band coupler. The through end of the first dual frequency coupler is connected to the first port, the coupling end of the first dual frequency coupler is connected to the second port, the isolation end of the first dual frequency coupler is connected to the first resistor; the through end of the second dual frequency coupler is connected to the first port. The terminal is connected to the fourth port, the coupling terminal of the second dual-frequency coupler is connected to the third port, and the isolation terminal of the second dual-frequency coupler is connected to the second resistor. The present invention realizes the miniaturization, dual-frequency characteristics or broadband characteristics of the circularly polarized antenna through the reasonable layout of the feed network.

Description

technical field [0001] The invention relates to the technical field of satellite communication, in particular to a dual-frequency broadband patch circularly polarized antenna. Background technique [0002] In recent years, with the rapid development and wide application of satellite navigation and satellite communications, circularly polarized antennas are used as front-end equipment for these systems, and their performance indicators play an important role in the performance of satellite communications handheld terminals and RFID card reading devices extremely important role. In addition, in order to facilitate the large-scale popularization and application of satellite communication terminals and radio frequency identification systems, the economic cost and volume of the system are crucial considerations. Under the premise, it must have the characteristics of low cost, compact structure and small size. When feeding circularly polarized antennas or array antennas, it is n...

AI Technical Summary

Problems solved by technology

[0003] The main purpose of the present invention is to provide a dual-frequency broadband patch circularly polarized antenna, which aims to solve the problem that the existing feeding network is bulky, which is not conducive to the integration of the radio frequency front end of the circularly polarized antenna, and most of them work at a single frequency point, which is not easy to solve. Technical Issues Facilitating Operation in Multi-Frequency or Broadband Conditions

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