Broadband compact circularly polarized antenna based on common mode and differential mode

Abstract

The broadband compact circularly polarized antenna comprises an annular metal structure printed on the upper surface of a dielectric substrate and a T-shaped metal structure printed on the lower surface of the dielectric substrate, and a T-shaped opening gap is etched in the annular metal structure on the upper surface of the dielectric substrate; the upper surface of the dielectric substrate outside the T-shaped opening gap is provided with a port a, and the tail part of the T-shaped metal structure is provided with a port b; the coaxial line inner core and the outer conductor are respectively connected with the metal structures at the two sides of the port a to realize the feed of the port a; the T-shaped metal structure on the lower surface of the dielectric substrate and the annular metal structure on the upper surface of the dielectric substrate are respectively connected to realize the feed of the port b; the antenna can realize circular polarization radiation when the port a and the port b carry out equal-amplitude in-phase feeding. The antenna integrates miniaturization and broadband of a circularly polarized antenna, has the advantages of wide frequency band, small size, compact structure, stable directional diagram, bidirectional radiation and the like, and is suitable for realizing broadband circularly polarized radiation of the antenna in the field of wireless communication.

Description

technical field [0001] The invention relates to antenna design technology in the field of wireless communication, in particular to a wide-band compact circularly polarized antenna based on common mode and differential mode. Background technique [0002] Modern communication systems need to achieve stable communication in complex environments and conditions, which have high requirements for antenna stability and anti-interference. Circular polarization is widely used in the fields of radio frequency identification, electronic countermeasures, wireless local area network and global positioning system because of its advantages of avoiding polarization loss and suppressing multipath interference. With the rapid development of modern wireless communication technology, people put forward higher and higher requirements for the bandwidth of communication equipment, so in recent years, broadband circularly polarized antenna has become a research hotspot. Traditional single-feed circ...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a wide-band compact circularly polarized antenna based on common mode and differential mode, so as to solve the problem that existing circularly polarized antennas are difficult to balance between miniaturization and wide frequency band

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