Wideband wide beam circularly polarized dielectric resonant antenna and design method thereof

Abstract

The present invention provides a wideband wide beam circularly polarized dielectric resonant antenna and a design method thereof. The antenna comprises a cylindrical microwave dielectric radiation unit, a dual-layer circuit substrate, a microstrip circuit, a coaxial feed and a choke sleeve. The cylindrical microwave dielectric radiation unit is arranged on the upper-layer circuit substrate of thedual-layer circuit substrate, and the dual-layer circuit substrate comprises an upper layer, an intermediate layer and a lower layer. The upper layer is a copper clad floor with an intersected gap, the intermediate layer is a rectangular microstrip, and the lower layer is a circular patch. The upper layer and the lower layer are connected via a metal via hole, the choke sleeve is connected with the lower-layer circular patch, and the coaxial feed penetrates the choke sleeve and is connected with the rectangular microstrip via the metal via hole. The antenna enables the bandwidth and the beam width to be increased, at the same time, has a lower structure complexity.

Description

technical field [0001] The invention relates to the field of antennas, in particular to a wide-bandwidth beam circularly polarized dielectric resonant antenna and a design method thereof. Background technique [0002] With the development of modern wireless communication systems, circularly polarized antennas have received more and more attention. Circularly polarized radiation can be used to reduce rain and fog interference and anti-multipath reflection, and requires high flexibility in the positioning of both receiving parties. It is becoming more and more attractive in many wireless communication applications. In addition, a wide 3-dB axial ratio beamwidth is also an important design requirement. In the global navigation and positioning system, the circularly polarized antenna used generally requires a 3-dB axial ratio beamwidth greater than 120° to ensure that wireless signals can be received anywhere on the earth. [0003] Existing methods to achieve wide aspect ratio...

AI Technical Summary

Problems solved by technology

The multi-feed method can provide greater bandwidth, but generally requires additional circuits such as power splitters and couplers, which is complex and not conducive to miniaturization

The structure of the single-feed method is simple, but the circular polarization bandwidth it can provide is also relatively narrow. At present, there are methods such as ladder-shaped or similar-shaped dielectric structures to expand the bandwidth, but there is no method that can simultaneously increase the bandwidth and axial ratio beamwidth.

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