A Dual Frequency Energy Selective Surface

Abstract

A dual-frequency energy selection surface, which is a space-adaptive energy selection surface that works simultaneously in C-band and S-band dual-frequency, includes a dielectric substrate, and the upper surface of the dielectric substrate is printed with periodically arranged surface structures, The surface structure includes a series of metal units distributed in an array. The metal unit contains two parallel and opposite rectangular metal rings, which are respectively the first metal ring and the second metal ring. There is a certain distance between the two metal rings. This spacing is the spacing between two adjacent long sides of the first metal ring and the second metal ring. The first metal ring and the second metal ring have the same length and different widths; A gap is provided to disconnect the two metal rings respectively, and the gaps of the first metal ring and the second metal ring are respectively connected through a loading diode and a lumped capacitor. The invention realizes the frequency selection characteristic of incident electromagnetic waves and the energy selection characteristic of sensing electromagnetic energy.

Description

technical field [0001] The invention is a dual-frequency energy selection surface simultaneously working in the C-band and the S-band, which is applied to the self-adaptive protection of the "front door" of the electronic information system. Background technique [0002] With the rapid development of electronic information technology, the degree of integration, intelligence and miniaturization of various electronic information equipment is continuously improved, its frequency is increasing day by day, energy consumption is also decreasing day by day, and its performance has been greatly improved. The sensitivity and vulnerability of electronic information equipment to strong electromagnetic interference and strong electromagnetic attack. At the same time, in addition to the strong electromagnetic interference that exists in nature, man-made strong electromagnetic interference and attack methods are becoming more and more mature. Sensitive equipment in the military and civil ...

AI Technical Summary

Problems solved by technology

[0003] At present, most of the protection methods against strong electromagnetic threats are "back door" protection methods such as filtering, shielding and grounding. These methods start from circuit design. Although simple and convenient, they increase the complexity and design difficulty of the system.

As for the "before front", it is mainly to install a high-power limiter in the front-end circuit. Although the high-power attenuator can greatly attenuate the current flowing into the circuit, it will affect the passage of normal signals while satisfying the greatly attenuated signal.

In addition, although the front-end filter or frequency selective surface (FSS) can isolate the out-of-band high-power signal, it cannot adaptively change its own working state according to the change of the electromagnetic environment, and cannot detect the strong electromagnetic frequency within the passband. Pulse for effective protection

[0004] Although some literatures put forward the concept of energy selection surface, which can adaptively change its working state according to the spatial field strength, and adaptively protect against strong electromagnetic pulses in the band, but its working frequency is L-band, and it is a low-pass filter, which cannot satisfy Protection requirements for high-frequency electronic systems

Or although the protection of S-band and C-band has been achieved respectively, its working frequency band is only a single frequency band, and simultaneous protection of multiple frequency bands is not possible.

[0005] From the comparison of the working frequency bands, in the published literature reports, no energy selection surface with multi-band working characteristics has been proposed for the time being.

Images