Super thin one side steep filter property frequency selecting surface

Abstract

This invented super thin single-side steep filter property frequency selection surface can be used in multiple frequency antennas of satellite, radar communication system as a frequency band multiplex machine, which is processed on a multi-layer chip with three-layers of metal faces and two dielectric layers formed by laminating two microwave plate layers, in which, the top and bottom metal surfaces are etched with periodic large square loop slots in the same size, another size of periodic small square loop slot coincident with the central position of the large one is etched on the middle metal side, two media layers are filled among the three metal surfaces, a serial metal through holes in even intervals around each of the slot unit on the laminated multi-layer chip to form a chip integrated waveguide cavity equivalent to traditional metal cavities.

Description

technical field [0001] The invention is an ultra-thin frequency selective surface with unilateral steep drop filter characteristics based on substrate integrated waveguide cavity cascading, which can be used as a frequency band multiplexer and applied to multi-frequency antennas of communication systems such as satellites and radars, belonging to microwave technology field. Background technique [0002] Frequency selective surfaces (FSS) are widely used in engineering applications. FSS has good selectivity for the transmission and reflection of electromagnetic waves. It has all-pass characteristics for electromagnetic waves in its passband, and total reflection characteristics for electromagnetic waves in its stopband. It has a spatial filtering function. In the microwave field, FSS can be used in the frequency band multiplexer of the communication satellite system, and the communication capacity can be expanded by using multi-feed configuration. Another main use is to mak...

AI Technical Summary

Problems solved by technology

Traditional FSS formed by periodic patch or slit array is poor in selectivity

In order to improve the frequency selection characteristics of FSS, the most common method in the world is to cascade multi-screen FSS to obtain better selection characteristics, but most of them are Chebyshev response characteristics, and the selection characteristics are not high enough.

At the same time, a dielectric layer used as an impedance transformer is filled between the cascaded multi-layer FSS. The thickness of the dielectric layer is about a quarter of the wavelength corresponding to the center frequency of the working frequency band, which makes the thickness of the entire FSS structure very large, which limits It is used in many practical applications

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