Dual-band circularly polarized microstrip antenna

Abstract

A dual-band circularly polarized microstrip antenna disclosed by the present invention mainly solves the problems in the prior art that the dual-band circularly polarized microstrip antenna is narrower in impedance matching bandwidth and axis ratio bandwidth and larger in structural size. The dual-band antenna comprises an antenna radiation unit (1), a dielectric substrate (2) and a metal grounding plate (3), the antenna radiation unit and the metal grounding plate are located on the upper and lower surfaces of the dielectric substrate respectively and are connected with a SMA joint (4) arranged at the bottom of the dielectric substrate, the antenna radiation unit is formed by connecting an impedance matching microstrip line (11), a circular arc-shaped microstrip line (12) a T-shaped microstrip line (13) and an L-shaped microstrip line (14), and the T-shaped microstrip line and the L-shaped microstrip line are used to control the radiation characteristics of the low and high frequency bands of the antenna respectively. The experiments show that the impedance and axis ratio bandwidths of the present invention can satisfy the demands of a wireless local area network (WLAN), and the antenna can be applied to a modern wireless communication system and a satellite navigation positioning system.

Description

technical field [0001] The invention belongs to the technical field of communication, and further relates to a dual-frequency circularly polarized microstrip antenna, which can be used for an infinite local area network (WLAN). Background technique [0002] WLAN is one of the most effective wireless access networks at present, and WLAN has been regarded as an important part of wireless communication technology. The wireless communication system generally requires the equipment to be able to send and receive data in a fast, efficient and reliable two-way manner, which is reflected in the antenna subsystem, that is, the antenna unit is required to be small and multi-frequency broadband, and the structure is simple and easy to integrate with wireless communication equipment. Compared with linearly polarized antennas, circularly polarized antennas can receive arbitrary polarized electromagnetic waves and effectively reduce the impact of multipath responses. Microstrip antennas ...

AI Technical Summary

Problems solved by technology

The dual-frequency antenna still has the following disadvantages: the antenna cannot achieve circularly polarized radiation, and polarization loss will occur during communication with other polarized antennas, resulting in energy loss, so its application in the communication field is limited

[0005] The literature "W.Liang, Y.C.Jiao, Y.Luan, and C.Tian, ​​A dual-band circularly polarized complementary antenna, IEEE Antenna Wireless Propag. Lett., vol.14, pp.1153–1156, 2015." introduced A dual-frequency circularly polarized microstrip antenna with a compact structure and serving wireless communication networks, through the combined action of the zigzag branches attached to the metal floor and the folded monopole antenna, it realizes the frequency band 2.3-2.7GHz and 4.8- Dual-frequency operation within 6.8GHz and circularly polarized radiation within the frequency bands 2.39-2.43GHz and 5.06-5.70GHz, circular polarization performance is good, but the disadvantage of this dual-frequency circularly polarized antenna is that the axial ratio bandwidth is quite narrow and cannot 5.70-5.825GHz band covering WLAN

[0006] A dual-frequency dual-frequency The circularly polarized microstrip antenna achieves dual-frequency circularly polarized radiation by coupling and feeding the microstrip line on the lower surface to the cross-shaped slots with different lengths on the upper surface. The circularly polarized radiation effect is better, but the dual-frequency The disadvantage of circularly polarized antennas is that they are larger in size and cannot better meet the requirements of miniaturization.

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