CIRCULARLY POLARIZED ANTENNA HAVING DUAL-FREQUENCY BROADBAND FUNCTION

摘要

Disclosed is a circularly polarized antenna having a dual-frequency broadband function, comprising a dielectric plate and a copper-coated 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, and the feed network comprises a coaxial connector, a first dual-frequency coupler, and a second dual-frequency coupler; a signal wire of the coaxial connector is connected to an input end of the first dual-frequency coupler, and a ground wire of the coaxial connector is connected to an input end of the second dual-frequency coupler. A direct-connection 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, and an isolation end of the first dual-frequency coupler is connected to a first resistor; a direct-connection 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, and an isolation end of the second dual-frequency coupler is connected to a second resistor. The utility model implements miniaturization, dual-frequency characteristics or broadband characteristics of a circularly polarized antenna.