A New Broadband Low Profile Array Antenna

Abstract

A new broadband low-profile array antenna, including: a waveguide slot array, composed of several segmented waveguide sub-arrays; a multi-stage rectangular coaxial impedance converter, which adopts a multi-layer folded form, has multiple output ports, and passes through multiple An output port is fixedly connected to each waveguide sub-array to feed each waveguide sub-array; the waveguide coaxial converter is connected to the input port of the multi-stage rectangular coaxial impedance converter, which is used to convert the rectangular waveguide into SMA coaxial Feed form, easy to test and apply. The array of waveguide slots is arranged in a "line", which expands the bandwidth of the antenna; the multi-stage rectangular coaxial impedance transformer is adopted, which combines the advantages of the microstrip feeding network and the waveguide feeding network, which not only effectively expands the frequency bandwidth, but also improves the in-band Flatness and reduced insertion loss; multi-stage rectangular coaxial impedance converter can realize any number of ports and any power distribution ratio of multiple ports according to actual application requirements, and can adopt single-stage or multi-stage impedance transformation according to bandwidth requirements Form; multi-layer folding form is adopted to effectively reduce the profile.

Description

Technical field [0001] The present invention relates to the field of antenna, and more particularly to a new type of broadband low profile array antenna. Background technique [0002] In recent years, with the development of modern radar communications and electronic confrontation technology, many military use, civilian sectors provide increasing demanding requirements, high gain, low pair, broadband, low loss performance, and low profile Simple structural requirements, has become a tireless pursuit of many scholars at home and abroad. [0003] The waveguide gap array antenna benefits its compact, high radiation efficiency, high power capacity, and easy to control caliber distribution, especially the ridge waveguide antenna can expand the frequency band width to a certain extent, reduce antenna size, therefore widely used In many ways to require narrow beam, low sub-petar systems and microwave communications. [0004] High gain antennas are usually implemented in array, how to fe...

AI Technical Summary

Problems solved by technology

However, the microstrip / stripline feed network has a large impedance discontinuity at the branch, and there is coupling between the parallel microstrip lines. For higher operating frequencies, the excessive electrical length can not be ignored. transmission loss and cause fluctuations in the power amplitude at the outlet of the fractional network; the feed structure of the waveguide network is usually simple in structure and low in loss, but relatively narrow in bandwidth

Images