Dual-band Broadband Patch Circularly Polarized Antenna

Abstract

Disclosed is a dual-frequency, broadband, circularly polarized patch antenna, comprising a dielectric plate and a copper pour metal ground. Four dual-frequency monopole radiation patches and a feed network are provided on the dielectric plate. The four dual-frequency monopole radiation patches are sequentially connected to four ports of the feed network. The feed network comprises a coaxial connector, a first dual-frequency coupler, and a second dual-frequency coupler. A signal line of the coaxial connector is connected to an input end of the first dual-frequency coupler. A ground wire of the coaxial connector is connected to an input end of the second dual-frequency coupler. A straight-through end of the first dual-frequency coupler is connected to a first port. A coupling end of the first dual-frequency coupler is connected to a second port. An isolation end of the first dual-frequency coupler is connected to a first resistor. A straight-through end of the second dual-frequency coupler is connected to a fourth port. A coupling end of the second dual-frequency coupler is connected to a third port. An isolation end of the second dual-frequency coupler is connected to a second resistor. According to the present invention, by means of a reasonable layout of a feed network, miniaturization of a circularly polarized antenna and the dual-frequency characteristic or broadband characteristic thereof are achieved.

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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