Circularly polarized slot antenna based on triangular substrate integrated waveguide resonant cavity

Abstract

The invention discloses a circularly polarized slot antenna based on a triangular substrate integrated waveguide resonant cavity. Two vertical rectangular radiation slots are etched at the central area of the upper metal surface of the equilaterally triangular resonant cavity, and the grounded coplanar waveguide on the lower metal surface of a dielectric plate is enabled to perform feeding so that the antenna is enabled to work in a TE<120> mode and a TE<210> mode in turn. Splitting of two degenerate modes in the resonant cavity is caused by adjusting the length difference of two radiation slots on the cavity so that the linearly polarized electromagnetic waves radiated by the two radiation slots are enabled to realize equal amplitude in a certain frequency band with the phase difference of 90 degrees, and thus the circularly polarized waves can be formed in the far field through superposition. According to the antenna structure, the advantage of high radiation performance of the conventional metal back cavity slot antenna is reserved and the profile is quite low. Besides, the whole antenna, including the radiation slots, the feed structure and the back cavity, is completely manufactured on the single layer dielectric plate so that the processing complexity can be greatly reduced, the processing cost can be reduced and planar circuit integration is enabled to be easier.

Description

technical field [0001] The invention relates to a circularly polarized slot antenna based on a triangular substrate integrated waveguide resonant cavity, which belongs to the field of microwave technology. Background technique [0002] In a wireless communication system, the antenna is an important electronic component for transmitting or receiving signals, and its performance is directly related to the performance of the entire system. Therefore, it has become an urgent need to develop miniaturized, integrated and high-performance RF antennas. practical needs. [0003] Due to the advantages of high efficiency, easy formation, and integration, the planar slot antenna just conforms to the development trend of modern wireless electronic communication systems, and is more and more favored by scientific researchers and engineering designers. Since the radiation from the gap on the metal surface is bidirectional, in practical engineering applications, the antenna usually needs t...

AI Technical Summary

Problems solved by technology

However, this traditional cavity-backed slot antenna has the disadvantages of large volume, complex structure, and high cost. Therefore, it is necessary to design a low-profile, high-gain slot antenna with light weight, low cost, and easy integration with planar circuits.

Images