Slot-coupled broadband single-feed circularly polarized microstrip antenna

Abstract

The invention provides a slot-coupled broadband single-feed circularly polarized microstrip antenna. The slot-coupled broadband single-feed circularly polarized microstrip antenna comprises a first radiation patch, an air supporting structure, a second radiation patch and a metal grounding plate which are arranged from top to bottom in a covering manner, and the first radiation patch and the second radiation patch are provided with corner cut structures. The first radiation patch and the second radiation patch are both pasted on the dielectric layer. The air supporting structure is of a rectangular-ambulatory-plane narrow frame structure. The top of the metal grounding plate is provided with a coupling gap, the bottom of the metal grounding plate is provided with a feed dielectric layer, aradio frequency signal feeder line is arranged below the coupling gap, and the radio frequency signal feeder line penetrates through the feed dielectric layer and feeds to the first radiation patch and the second radiation patch. According to the microstrip antenna adopted by the invention, the coupling gap size is reduced, network layout is facilitated, an air layer is improved, and the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of antennas, in particular to a slot-coupled broadband single-feed circularly polarized microstrip antenna. Background technique [0002] The structure of the microstrip antenna is generally composed of a dielectric substrate, a radiator and a ground plane. The thickness of the dielectric substrate is much smaller than the wavelength. The thin metal layer at the bottom of the substrate is connected to the ground plane, and the thin metal layer with a specific shape is made on the front side by photolithography as a radiator. The shape of the radiation sheet can be changed in many ways according to requirements. The rise of microwave integration technology and new manufacturing processes has promoted the development of microstrip antennas. Compared with traditional antennas, microstrip antennas are not only small in size, light in weight, low profile, easy to conform, easy to integrate, low in cost, suitabl...

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Problems solved by technology

[0007] The coupling gap of the microstrip antenna in the prior art is too long, and the longest part is equivalent to the radiation patch, so it is impossible to carry out the layout of the complex network, and the back radiation is relatively large; in addition, in the prior art, the air layer in the double-layer radiation patch Some of them are filled with a medium with a dielectric constant close to air, and the material is very expensive, which increases the production cost of the product, and at the same time requires high uniformity of the dielectric material

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