Loop traveling wave antenna generating radio frequency OAM on basis of metal ring cavity

Abstract

The invention discloses a loop traveling wave antenna generating radio frequency OAM on the basis of a metal ring cavity. The structure of an antenna body is the metal ring cavity, the top face of the metal ring cavity is provided with a seam along the circumference, two port metallic waveguides are formed in the positions, 1 / 4 away from the circumference, of the metal ring cavity to serve as double-source excitation ports of the antenna, and when microwave sources with the same frequency and a phase difference of + / - 90 degrees are input into the two double-source excitation ports, an electromagnetic field in the metal ring cavity is distributed as traveling waves around the circumference clockwise or anticlockwise. The seam in the top of the metal ring cavity forms a loop traveling wave antenna. The size of the metal ring cavity and the position of the seam are reasonably designed, so that switching of a microwave guide mode and an OAM mode can be achieved, and transmission of radio frequency OAM wave beams of different I orders is formed in a space. According to the loop traveling wave antenna, a traditional metal waveguide is used for achieving OAM wave beam transmission of a planar radio frequency waveguide structure, and the loop traveling wave antenna plays a very important role in developing radio frequency high-speed OAM communication.

Description

technical field [0001] The invention belongs to the technical field of OAM wireless communication, and relates to a ring traveling wave antenna for generating radio frequency OAM based on a metal ring cavity. Background technique [0002] As the world enters the mobile Internet era, the spectrum gap for mobile communication services is becoming increasingly serious. Due to the limited high-quality spectrum resources in the low frequency band, it is difficult to meet the new demands of mobile communications only by allocating new spectrum. In this case, it is particularly important to develop new technologies to improve the efficiency of the use of bits / Hz. At present, people have done a lot of research on expanding information capacity resources based on the dimensions of frequency spectrum, phase, and amplitude of electromagnetic waves, such as improving the spectrum utilization rate of a new intelligent wireless communication technology - cognitive radio; improving the sp...

AI Technical Summary

Problems solved by technology

So far, most OAM beam generation methods come from the circular array antenna idea designed by Thide et al. in 2007, but the order of the OAM beam generated by this method is limited by the number of circular array antennas

Assuming that the number of circular array antennas is N, the order l of the OAM beams generated must be less than N / 2, and this method is not conducive to the multiplexing of OAM beams

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