Design method of active frequency selective surface

A technology of frequency selective surface and design method, which is applied in the field of microwave technology and aircraft stealth, can solve the problems of prone to parasitic resonance and lack of scalability, and achieve the effect of reducing parasitic resonance, simple structure and easy processing

Active Publication Date: 2018-03-13
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0004] The purpose of the present invention is to solve the technical problem that the active frequency selective surface technology in the prior art does not have scalability, and is prone to spurious resonance phenomenon under wide-angle (0°~50°) irradiation, and provides an active frequency Choose a design method for the surface

Method used

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  • Design method of active frequency selective surface
  • Design method of active frequency selective surface
  • Design method of active frequency selective surface

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Embodiment

[0052] Assume that active radar composite guidance radome active radar works at 14GHz±200MHz, and passive radar band works at 2GHz~4GHz. When working, the transmittance of the two passbands of AFSS is ≥ 90%, when not working, in the range of 0°~50° incident angle, in the range of 2GHz~4GHz, the reflectivity of AFSS is ≥90%. Next, how to implement the present invention will be shown by taking the technical index requirement as an example.

[0053] The design method of the active frequency selective surface provided by the present invention takes the densely arranged cross metal patches as an example, and the densely arranged Y-shaped metal patches can also refer to the following implementation manners. Only two states of on and off are required between the metal patches. Therefore, PIN diodes are selected as the electronically controlled lumped components.

[0054] The first choice is to define the supporting medium of the AFSS metal patch. The present invention selects a poly...

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Abstract

The invention relates to a design method of an active frequency selective surface, which belongs to the field of microwave technology and aircraft stealth technology. It solves the technical problems that the active frequency selection surface technology in the prior art has no expandability, and the parasitic resonance phenomenon is prone to occur under wide-angle (0°-50°) irradiation. This method first periodically loads electronically controlled lumped elements on the patch-type frequency selective surface with dense arrays, and then converts the patch-type frequency-selective surface loaded with electronically controlled lumped elements into a bridge network diagram and displays it on On the XOY plane Cartesian coordinate system, detect the potential at both ends of each electronically controlled lumped element, and get a pair of parallel equipotential lines on the bridge network diagram, that is, determine that the feeding mode of the active frequency selective surface is along the parallel equipotential lines Potential line feed, and then optimize the active frequency selective surface of the design. The design method of the invention has wide application prospects in the fields of radome, wave-absorbing material, omnidirectional scanning antenna, phased array radar and the like.

Description

technical field [0001] The invention relates to a design method of an active frequency selective surface, belongs to the field of microwave technology and aircraft stealth technology, and is mainly used in the design of active and passive radar composite guidance radome. Background technique [0002] The radome used by the aircraft is a kind of transparent electromagnetic window, and only the stealth technology that does not affect the wave-transmitting function of the radome can be applied to the radome. At present, Frequency Selective Surface (FSS) is the best technical way to solve the problem of radome stealth. For the stealth of the active and passive radar composite guidance radome, it is required that the frequency response characteristics of the FSS must be within the scanning range of 0°~50°. 0 The ±Δf(Ku) band maintains "high transparency" transmission, and the passive radar 2GHz~4GHz(S) band shows "high transparency" when it is working, and it shows "high reflect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P1/20H01P11/00H01Q1/42
Inventor 高劲松徐念喜单冬至
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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