Coplanar Vivaldi antenna with L-shaped slot line

Abstract

The invention belongs to the technical field of antennas, and particularly relates to a coplanar Vivaldi antenna with an L-shaped slot line. The antenna comprises an antenna dielectric substrate, an antenna radiation module and a microstrip line-via hole feed structure; the antenna radiation module is divided by the L-shaped slot line to form an upper metal radiation patch and a lower metal radiation patch; the L-shaped slot line is composed of two sections of linear slot lines and a gradually-changed slot line; the linear slot line parallel to the horizontal central axis of the antenna dielectric substrate plays a role in connection in the L-shaped slot line, and forms the L-shaped slot line together with the linear slot line with an open circuit at the tail end and the gradually-changed slot line; the gradually-changed slot line is provided with a trumpet-shaped opening, is symmetrical about the horizontal central axis of the dielectric substrate and is in exponential gradual change, and the microstrip line is coupled with a linear slot line playing a connecting role in the L-shaped slot line. Impedance matching of the antenna at low frequency is improved through a simple structure, the working frequency band of the antenna is remarkably expanded, miniaturization of the antenna is achieved, and meanwhile the radiation efficiency of the antenna is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of antennas, in particular to a coplanar Vivaldi antenna with L-shaped slot lines. Background technique [0002] The Vivaldi antenna, also known as the exponential gradient slot antenna, was proposed by Gibson in 1979 and is a planar end-fire antenna. Due to its wide operating frequency band, high gain, low cross polarization, simple structure, and easy processing, it is widely used in ultra-wideband fields, such as ground-penetrating radar, ultra-wideband communication systems, etc. [0003] Antenna miniaturization is a research hotspot in the field of antenna technology. Usually, the size of the Vivaldi antenna is about half of the wavelength corresponding to the lowest operating frequency, which limits the application of the Vivaldi antenna in many important occasions. Therefore, many scholars at home and abroad have conducted research on its miniaturization, mainly using Methods include improving the f...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of coplanar Vivaldi antenna with L-shaped groove line, solve the technical problem that the antenna radiation efficiency of Vivaldi antenna reduces in the process of expanding the antenna operating frequency band and miniaturization

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