A Broadband Circularly Polarized Patch Antenna Loaded by a Metal Plate

Abstract

The invention discloses a broadband circularly polarized patch antenna loaded with a metal sheet, including a circular radiation patch, two feeding probes, a metal loading sheet, a metal floor and a broadband balun, all of which are printed The circuit board technology is printed on the dielectric substrate; among them, the feeding probe is an L-shaped feeding probe, which is printed on one side of the dielectric substrate; the metal loading sheet is printed on both sides of the dielectric substrate. Through the broadband balun, the input signal is divided into two equal-amplitude orthogonal signals, and the energy is respectively fed into two L-shaped probes by means of the metal vias opened on the substrate; the adjustment placed between the two feeding probes The size and position of the metal loading piece can greatly broaden the axial ratio bandwidth of the antenna. The present invention aims at the characteristics of the standing wave and the narrow bandwidth of the axial ratio of the ordinary patch antenna, and realizes a circularly polarized antenna with a wide standing wave bandwidth and a wide axial ratio by using the printed circuit technology. The antenna can be easily integrated with the active circuit, adapting to Meet the communication requirements of L-band and S-band.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to an L-band and S-band mobile communication handheld antenna. Background technique [0002] Today, with the rapid development of communication, radar and other technologies and the expansion of application scope, the antenna as the front end of the receiving and transmitting system needs to work in various polarization modes and harsh weather conditions, and a single polarization mode is increasingly unable to meet the requirements. practical application needs. [0003] A circularly polarized wave can be superimposed by two linearly polarized waves with equal amplitude and a phase difference of 90 degrees; a linearly polarized wave can also be superimposed by two circularly polarized waves with different hand directions. Therefore, linearly polarized waves of different rotation directions can be received by circularly polarized antennas, and circularly polarized wav...

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Problems solved by technology

[0002] Today, with the rapid development of communication, radar and other technologies and the expansion of application scope, the antenna as the front end of the receiving and transmitting system needs to work in various polarization modes and harsh weather conditions, and a single polarization mode is increasingly unable to meet the requirements. Practical application needs

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