OAM radio wave generating device

Abstract

The present invention discloses an OAM radio wave generating device. The device comprises a first substrate, a second substrate, a grounding plate, N radiation patches and feeding networks. The firstsubstrate and the second substrate are insulating medium substrates, and the grounding plate is a conducting medium grounding plate. The back surface of the first substrate, the grounding plate and the front surface of the second substrate are bonded successively, the radiation patches are arranged on the front surface of the first substrate, and the feeding networks are arranged on the back surface of the second substrate. The radiation patches form a circular antenna array of N array elements, and the radiation patches are circular polarized antennas. The input terminal of the feeding networks is a signal input terminal, each output terminal of the feeding networks is connected with each radiation patches, and the lengths of the feeding networks from the input terminal to each output terminal are equal. According to the device, equal phase difference feeding is not needed, and a phase shifter is not needed, so that the complexity of a feeding system is greatly reduced, and the structure is simple. The device does not need to change the feeding system when the device generates different mode number OAM radio waves, so that the application scope is very wide.

Description

technical field [0001] The present invention particularly relates to a device for generating OAM radio waves. Background technique [0002] Orbital angular momentum (OAM) radio waves have attracted a lot of attention in recent years because they show the potential to transmit multiple signals simultaneously at the same frequency, which can be used to improve spectral efficiency and thus channel capacity. The utilization of OAM radio waves was initially concentrated in the optical domain and has recently been proposed for lower frequency radio communications and radar imaging. [0003] There are generally two categories of methods for generating OAM radio waves. The first type is OAM radio waves generated by plane wave transformation, such as variable helical phase plates; the second type is OAM radio waves generated by phased uniform circular arrays, namely: N antenna units arranged in a circular array , feeding a signal of the same amplitude, but with a continuous phase d...

AI Technical Summary

Problems solved by technology

The first type is OAM radio waves generated by plane wave transformation, such as variable spiral phase plates; the second type is OAM radio waves generated by phased uniform circular arrays, that is, N antenna elements are arranged in a circular array , feeding signals of the same magnitude, but with a continuous phase delay between the antenna elements where the integer l is the number of OAM modes

In these designs, in order to generate a continuous phase delay between the array elements, phase shifters need to be added to the feed system, which makes the design relatively complicated

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