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Design method of active frequency selection surface

A technology of frequency selective surface and design method, applied in the field of microwave technology and aircraft stealth, can solve the problems of lack of scalability and easy occurrence of parasitic resonance, and achieve the effect of simple structure, reduced parasitic resonance, and mature manufacturing process

Active Publication Date: 2016-01-13
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 selection 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 selection surface, belongs to the fields of microwave technology and aircraft stealth technology, and solves the technical problems that a technology of the active frequency selection surface in the prior art is not expansible and a parasitic resonance phenomenon tends to occur under wide angle (0 to 50 degree) irradiation. The method comprises that electric-control lumped elements are loaded on the surface-mounted frequency selection surface of dense distribution periodically; the surface-mounted frequency selection surface loaded with the electric-control lumped elements is converted into a bridge network diagram, the bridge network diagram is displayed in an XOY planar rectangular coordinate system, the potentials at the two ends of each electric control lumped element are detected, and a pair of parallel isopotential lines is obtained from the bridge network diagram, namely, it is determined that the active frequency selection surface carries out feed along the parallel isopotential lines; and the designed active frequency selection surface is optimized. The design method can be widely applied in the fields including radomes, absorbing materials, omnidirectional scanning antennas and phased array radars.

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...

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Application Information

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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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