Circularly polarized ceiling antenna

Abstract

The invention discloses a circularly polarized ceiling antenna, which comprises a reflecting grounding plate with one side grounded and a plurality of groups of dielectric plates vertically arranged on the reflecting grounding plate. The dielectric plates are arranged on the surface of the reflecting grounding plate around the circumference by taking the center of the reflecting grounding plate as a circle center; a radiation patch is etched on one side surface of each group of dielectric plates; the radiation patch is provided with a gap used for changing a current path. Coaxial feed is carried out through the through hole in the center of the reflecting grounding plate, and the feed mode does not affect the characteristics of the antenna. According to the antenna, a substrate with a radiation patch composed of rectangular micro-strips and trapezoidal micro-strips on the four sides is vertically welded to a reflecting grounding plate, the back face of the reflecting grounding plate is grounded, and the circular polarization characteristic is easily achieved through the structure. Each radiation patch is loaded with an inverted-L-shaped gap, and the inverted-L-shaped gaps are used for changing current paths on the radiation patches, so that the radiation intensity of the antenna in the radiation direction is enhanced, and the problem of radiation zero points of the antenna in the radiation direction is effectively solved.

Description

technical field [0001] The invention is applied to the technical field of microwave antennas, in particular to a circularly polarized ceiling antenna. Background technique [0002] With the development of wireless communication technology, the number of communication systems continues to increase, and multiple antennas must be used on the same wireless device, but these antennas have different polarization characteristics. Transceiver antennas with different polarization characteristics will produce polarization loss, etc., while circularly polarized (CP) antennas can receive incoming waves with any polarization, so that the transmission and reception of wireless communication becomes very flexible, and there is no need for strict alignment of the transceiver antenna Accurate, and can suppress multipath, provide more reliable sensitivity, very attractive in modern wireless communication. [0003] The circular polarization of the antenna can be realized by methods such as an...

AI Technical Summary

Problems solved by technology

This design greatly improves the performance of the antenna, such as increasing the gain, increasing the axial ratio bandwidth, etc., but increases the complexity of the design structure and feeding method

Images