A Circularly Polarized Antenna

Abstract

The invention discloses a circularly polarized antenna in the field of communication and measurement and control, which includes a horn antenna body and a rectangular waveguide for feeding. The horn antenna body includes a radiation layer, a feeding network layer dielectric plate and a reflection cavity layer. The feed network layer dielectric board is set under the radiation layer, the reflective cavity layer is set under the feed network layer dielectric board, and the polarizer on the feed network layer dielectric board is a hook surrounded by an inner curve and an outer curve. Type structure, the inner curve and the outer curve are gradient curves, and the other end of the hook structure opposite to the hook head of the hook structure is the feed input end. The invention adopts the antenna structure with wide standing wave bandwidth and wide axial ratio bandwidth designed according to the requirements of communication, measurement and control on polarization purity and installation space, and also has the characteristics of low profile, small size and easy integration, and is especially suitable for communication, measurement and control Fabrication of High Performance Low Profile Circularly Polarized Antennas for Aircraft Carriers in Systems.

Description

technical field [0001] The invention relates to a circularly polarized antenna in the fields of communication and measurement and control. The invention is more suitable for use in communication and measurement and control systems requiring circularly polarized radiation antennas. Background technique [0002] At present, the antennas that can form circular polarization in communication and measurement and control systems mainly have the following structural forms. Although they have their own characteristics in performance, they all have certain shortcomings. [0003] 1. Corner-cut circularly polarized microstrip antenna: This type of antenna has a simple structure and low profile, but the antenna axial ratio and standing wave bandwidth are less than 2%, and the radiation efficiency is low, which is not conducive to achieving higher gain. [0004] 2. Circularly polarized microstrip antenna form with external circularly polarized bridge. The axial ratio and standing wave ban...

AI Technical Summary

Problems solved by technology

[0003] 1. Corner-cut circularly polarized microstrip antenna: This type of antenna has a simple structure and low profile, but the antenna axial ratio and standing wave bandwidth are less than 2%, and the radiation efficiency is low, which is not conducive to achieving higher gain

[0004] 2. Circularly polarized microstrip antenna form with external circularly polarized bridge. The axial ratio and standing wave bandwidth of this form of microstrip antenna are generally wider than 3dB. The axial ratio bandwidth is greater than 15%, and the standing wave bandwidth of less than 2 is greater than 20. %, but the external circular polarization bridge takes up a lot of space, the feeder is long, and the difference loss is large, which is not conducive to the integrated design of antenna and network

[0005] 3. Circularly polarized horn antenna. Compared with the traditional circularly polarized microstrip antenna, this form of circularly polarized antenna has the characteristics of wide impedance and axial ratio bandwidth, low insertion loss of the feed network, and high radiation efficiency, but the feed The network is bulky, which is not conducive to miniaturization design

Images