Circularly polarized microstrip duplex antenna

Abstract

The invention discloses a circularly polarized microstrip duplex antenna. The circularly polarized microstrip duplex antenna comprises a microstrip patch antenna, two feed probes, a duplex power distribution network, a transmitting port and a receiving port; the two feed probes are both connected with the duplex power distribution network; the duplex power distribution network comprises a power distribution microstrip line, a transmitting microstrip band elimination filter, a transmitting impedance conversion microstrip line, a receiving microstrip band elimination filter and a receiving impedance conversion microstrip line; each feed probe comprises a horizontal microstrip and a vertical metal probe; one end of the vertical metal probe is connected with the center of the horizontal microstrip while the other end of the vertical metal probe is connected with the power distribution microstrip line. The microstrip circularly polarized antenna with a duplexing function is designed in the invention; transmitting and receiving of the antenna adopt the same electromagnetic wave polarization mode which refers to left-hand circular polarization electromagnetic wave; and meanwhile, by virtue of the setting of the transmitting and receiving microstrip band elimination filters, high isolation degree between transmitting and receiving ports can be realized.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a circularly polarized microstrip duplex antenna. Background technique [0002] The antenna feeder system is the front end of the wireless communication system and an indispensable key component of the wireless communication system. The antenna feed system mainly includes antennas, filters and duplexers. The traditional method is to design the three separately and then connect them. The disadvantage is that all three need a separate matching network to match the 50 ohm feeder, which is likely to cause problems of large size and total weight. At the same time, too many matching networks bring the disadvantage of high loss. [0003] With the development of wireless communication, the communication system tends to be miniaturized and integrated more and more. Therefore, there is a great demand for an integrated antenna-feeder system. Duplex antennas combine antennas...

AI Technical Summary

Problems solved by technology

The disadvantage is that all three need a separate matching network to match the 50 ohm feeder, which is likely to cause problems of large size and total weight. At the same time, too many matching networks bring the disadvantage of large loss

[0006] Therefore, the current co-polarized duplex antenna generally has the disadvantages of low port isolation, a large interval between antenna transmit and receive frequencies, and low antenna gain.

Moreover, the current co-polarized duplex antennas are basically linearly polarized duplex antennas, and there are relatively few circularly polarized duplex antennas.

Images