Adjustable plasma photonic crystal frequency-selecting filter

Abstract

The invention relates to an adjustable plasma photonic crystal frequency-selecting filter. The filter comprises a support box and a plasma generation device arranged in the support box. A first interface and a second interface are arranged at the top and bottom of the support box respectively. The inside of the first interface and the inside of the second interface are both connected with the plasma generation device. One of the outside of the first interface and the outside of the second interface is connected with a drive power supply, and the other is connected with the ground. A rectangular waveguide is arranged on the left side of the support box. A photoelectric signal conversion device is arranged on the right side of the support box. The photoelectric signal conversion device comprises a photodetector and a signal output interface connected with the photodetector. According to the invention, the filter made by a plasma photonic crystal has a good filtering effect within a forbidden band range; the transmitted frequency component is single; the degree of agreement between the actual effect and the design is high; the production cost is low; and adjustable narrowband frequency selection is realized through plasma adjustment.

Description

technical field [0001] The invention relates to the technical field of microwave communication, in particular to an adjustable plasma photonic crystal frequency selection filter. Background technique [0002] Microwave Communication (Microwave Communication) is communication using microwaves, electromagnetic waves with a wavelength between 1 millimeter and 1 meter. Because of its wide frequency bandwidth and large capacity, microwave communication can be used for the transmission of various telecommunication services. Such as telephone, telegraph, data, fax and color TV can be transmitted through microwave circuits. In a microwave communication system, a filter is a wavelength selective device. Simply put, it is a device that separates useful and unwanted signals, and plays an important role in multiplexing equipment. With the increasing development of microwave communication, frequency resources are becoming more and more scarce, and the development of wavelength division...

AI Technical Summary

Problems solved by technology

Secondly, when processing information in the electrical signal domain, circuit filters often have disadvantages such as large loss, large difference between filtering effect and design, and high cost.

In comparison, the optical filter directly processes the optical signal, and the filtering effect is often ideal, especially the photonic crystal filter with a "band gap", which has good filtering characteristics, including low loss, anti-electromagnetic interference, operating frequency Wide range, etc., but traditional photonic crystal filters often have the disadvantage of not being adjustable

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