Cavity-backed patch antenna based on substrate integrated waveguide

Abstract

In order to obtain a better omnidirectional antenna, the invention discloses a cavity-backed patch antenna based on a substrate integrated waveguide, which comprises a dielectric plate, a first conductive plate, a second conductive plate and a feed probe, the first conductive plate, the second conductive plate and the dielectric plate are cylindrical, and one bottom surface of the first conductiveplate is connected with one bottom surface of the dielectric plate. The area of the section of the first conductive plate is equal to that of the section of the dielectric plate, and the circle center of the first conductive plate is coaxial with that of the dielectric plate; a first circular hole is formed in the conductive plate, and the circle center of the first circular hole, the circle center of the second circular hole and the circle center of the dielectric plate are coaxial; a plurality of short-circuit via holes are formed in the edge of the first circular hole in a surrounding manner; one bottom surface of the second conductive plate is connected with one bottom surface of the dielectric plate, the radius of the section of the second conductive plate is smaller than that of thefirst circular hole, and the circle center of the second conductive plate is coaxial with the circle center of the dielectric plate; a second circular hole is formed in the second conductive plate; the feed probe is arranged at the center of the antenna and longitudinally penetrates through the dielectric plate.

Description

technical field [0001] The invention relates to the field of antennas, in particular to a cavity-backed patch antenna based on a substrate integrated waveguide. Background technique [0002] The omnidirectional antenna is a kind of antenna commonly used in wireless communication. It can achieve omnidirectional radiation in azimuth, allowing multiple users to use it at the same time. Existing omnidirectional antennas include monopole antennas and microstrip patch antennas. A monopole antenna is easy to fabricate, but it is thicker and has a smaller bandwidth. The microstrip patch antenna is easy to fabricate, and can achieve large bandwidth by loop coupling, loading short-circuit nails and double-layer dielectric boards. However, the performance of the microstrip patch antenna is easily affected by surface waves and the external environment. Due to the cavity-back structure, the cavity-backed antenna is less affected by surface waves. However, most of the existing cavity...

AI Technical Summary

Problems solved by technology

The invention adopts the dielectric integrated waveguide technology, which solves the problem that the traditional microstrip patch antenna is easily affected by surface waves, and has the characteristics of easy integration and processing; plate, this structure enables a first-order cavity mode, a second-order cavity mode and a second-order patch mode of a small conductive plate to couple, thereby realizing the broadband characteristics of the triple resonance

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