A Small Ultra-Wideband Patch Antenna for Foreign Object Detection

Abstract

The invention provides a miniaturized ultra-wide band patch antenna used for foreign matter detection. The antenna is characterized by comprises a dielectric substrate disposed in the middle, the two sides of the dielectric substrate are respectively provided with a top-layer radiation metal patch layer and a bottom-layer grounding plate metal layer, the top-layer radiation metal patch layer comprises a semicircular radiation patch and a segment of a microstrip feed line which are connected, the bottom-layer grounding plate metal layer comprises a semicircular grounding patch and a step-like parasitic coupling patch which are separate, signals are fed from the microstrip feed line, and the semicircular radiation patch and the semicircular grounding patch which are disposed at the two sides form a dipole antenna together. According to the invention, the miniaturized broadband antenna is designed based on the demand of a microwave imaging foreign matter detection system. According to the antenna, the bandwidth is expanded through additionally arranging a slit and the parasitic patch on the basis of a semicircular patch antenna, and at the same time, the antenna has the advantage of miniaturization.

Description

technical field [0001] The invention relates to a small-sized low-frequency ultra-wideband patch antenna that can be used for foreign object detection, which can effectively judge whether there are foreign objects inside a complex structure and determine the position and size of the foreign objects, and belongs to the technical field of microwave antennas. Background technique [0002] Microwave imaging refers to an imaging method that uses microwaves as information carriers. It uses electromagnetic waves of 300MHz to 300GHz and corresponding wavelengths of 1m to 1mm to irradiate the measured object, and then reconstructs the shape or ( complex) dielectric constant distribution. Because the dielectric constant is closely related to the water content of biological tissue, microwave imaging is very suitable for imaging biological tissue. When the large discontinuity limits the efficiency of ultrasonic imaging, and the low density of biological tissue limits the use of X-rays, ...

AI Technical Summary

Problems solved by technology

However, due to the shortcoming of its narrow frequency band, the development of microstrip antennas is limited. In recent years, the miniaturization and broadband technology of microstrip antennas have attracted more and more attention.

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