Vivaldi antenna array with symmetrical directional diagrams

Abstract

The invention provides a vivaldi antenna array with symmetrical directional diagrams. The vivaldi antenna array comprises array feeding and array antenna radiation arm design and array mounting and feeding mode design, wherein an array feeding part comprises a multi-stage transition line power divider, and width and length of each cascaded power division line are adjusted through software to realize impedance matching; an array antenna radiation arm part adopts a coplanar exponential line radiation arm; an array mounting and feeding mode is as follows: an antenna array is rotated by 180 degrees, and two feed ports are opposite in the leftward and rightward direction and subjected to constant-amplitude inverse feeding through magic T. With adoption of asymmetric design of unit radiation arms, the disadvantage is turned into the advantage, and a feeding network is simple and easy and convenient to design; after rotation and inverse feeding are adopted, radiation of higher-order modes with symmetrical structures cancels, and effective energy concentration radiation is facilitated; due to polarization cancellation of electrical fields in other directions, lateral radiation of the rotated arrays is remarkably reduced.

Description

technical field [0001] The present invention relates to an antenna array, especially a vivaldi antenna array. Background technique [0002] The exponential tapered slot antenna is an end-fired traveling wave antenna, also known as the vivaldi antenna, because of its wide frequency band, symmetrical E-plane H pattern, medium gain, light weight, and easy integration with microwave circuits. It is widely used in ultra-wideband wireless communication systems, wideband phased array radar and radio astronomy and other fields. However, the current asymmetry of the radiation arm of the exponentially tapered slot antenna fed by microstrip, the excitation of cross-polarization and high-order modes will cause significant distortion of the pattern, resulting in significant fluctuations in the gain at certain angles and the antenna pattern asymmetrical properties. This defect seriously affects the large airspace coverage and wide-angle scanning capabilities of the angle-scanning array ...

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Problems solved by technology

[0004] In order to solve the problem of asymmetric radiation pattern caused by the asymmetry of the radiation arm and the asymmetry of the radiation arm current in the antenna array composed of the antenna, the present invention adopts the symmetrical radiation arm, feeds the antenna array with a microstrip line, and connects each row The linear array is printed on a dielectric substrate, and the radiation arm has a symmetrical characteristic, so that two adjacent gradient slot arrays are rotated 180 degrees and placed opposite to each other, and the two adjacent arrays are fed in reverse to realize the E-plane of the end-fire vivaldi array Symmetry of the pattern

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