A frequency selective surface with ultra-wide incident angle stability and its design method
A technology of frequency selective surface and design method, which can be applied to antennas, electrical components, etc., and can solve problems such as limited improvement of structural angular stability and impact on system transmission performance.
Active Publication Date: 2022-05-20
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology
It can be seen that the use of miniaturized design to improve the angular stability of the structure is limited, and the transmission performance of the system will still be greatly affected when the oblique incidence is super large angle
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[0039] The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0040] An embodiment of the present invention proposes a frequency selective surface with ultra-wide incident angle stability, and the specific components include: a dielectric plate, a resonant structure located on the upper surface of the dielectric plate, a feed structure located on the lower surface of the dielectric plate, and a connection between the upper and lower surfaces of the dielectric plate metal vias.
[0041] The resonant structure includes two upper parallel microstrip lines, two rectangular metal patches of the same size, and a varactor diode located between the two rectangular metal patches; the two rectangular metal patches are located between the two upper parallel microstrip lines, The feed lines on both sides of the varactor diode are connected to the feed structure through metal through holes.
[0042] In one embodiment of the pres...
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The invention discloses a frequency selective surface with ultra-wide incident angle stability and a design method thereof, which can realize the matching of structural equivalent impedance and air impedance at various oblique incidence angles, thereby realizing oblique incidence angles from 0° to 80° Maintains a stable transmission response throughout the range. The frequency selective surface proposed by the present invention includes a dielectric plate, a resonant structure located on the upper surface of the dielectric plate, a feed structure located on the lower surface of the dielectric plate, and a metal through hole connecting the upper and lower surfaces of the dielectric plate. The present invention determines the condition that the equivalent impedance of the structure satisfies according to the air impedance, and obtains μ t and ε t Conditions to be met; design the parameters of the resonant structure located on the upper surface of the dielectric plate; divide the square metal patch into two rectangular metal patches of equal size, and embed a varactor diode in the middle, and add a feeder line at the bottom of the medium, The varactor diodes are connected to both sides of the upper layer through metal vias, and distributed along a direction perpendicular to the upper layer parallel metal lines.
Description
technical field [0001] The invention belongs to the technical field of frequency selective surface design, in particular to a frequency selective surface with ultra-wide incident angle stability and a design method thereof. Background technique [0002] Frequency selective surfaces (FSSs) have been studied for decades and are widely used in a wide variety of applications such as subreflectors, polarizers, bandpass radomes, etc. As one of the important applications of FSS, the airborne radome is placed at the front end of the airborne radar system to protect the microwave devices from the damage of the external environment. In this case, the FSS radome is designed to losslessly transmit the desired signal within the operating frequency band of the antenna, while reflecting electromagnetic waves outside the operating frequency band. At the same time, in order to ensure the radiation performance of the system, the stable wave-transmitting performance of the FSS radome is parti...
Claims
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IPC IPC(8): H01Q15/00
CPCH01Q15/002H01Q15/0046
Inventor 金城吕奇皓张彬超曹凯淇黎亮
Owner BEIJING INSTITUTE OF TECHNOLOGYGY