A dual-polarization broadband external suppression three-dimensional frequency selective surface

Abstract

The invention discloses a dual-polarization broadband external suppression three-dimensional frequency selective surface. The frequency selective surface is a three-dimensional periodic structure processed by a dielectric substrate, which includes a square coaxial waveguide and a parallel plate waveguide. The surface of the dielectric substrate has a metal patch, and the two ends of the metal patch in the electromagnetic wave propagation direction are provided with rectangular grooves, and the metal via holes in the dielectric substrate are connected to the metal patches on both sides. The parallel slab waveguides form a dual-mode resonator, producing a passband containing two transmission poles, and due to the interaction between the two waveguides, a wide stopband containing two transmission zeros near the passband. The invention has low polarization sensitivity in the dual-polarization working mode, can control the frequency range of the passband and the stopband by changing its related physical parameters, realizes dual-polarization application and has good incident angle stability.

Description

technical field [0001] The invention belongs to electromagnetic field and microwave devices and structures, in particular to a dual-polarized broadband external suppression three-dimensional frequency selective surface. Background technique [0002] Frequency Selective Surface (FSS), as a periodic array, has been widely used in many fields in the past decades. Especially in the military field, FSS can be used as a radome to effectively reduce the radar scattering cross section of various aircrafts, missiles, satellites, etc. equipped with radar sensors, so as to achieve the purpose of stealth; The small size of the spaceborne antenna can build a multi-band multiplexing antenna system; it can also be used as a stealth mast for naval ships, integrating various radar and communication antennas inside. In the civilian field, FSS can be integrated in buildings as a spatial filter to improve indoor wireless security and optimize the coverage of wireless local area networks; it ca...

AI Technical Summary

Problems solved by technology

The traditional FSS with a simple structure is difficult to achieve steep frequency selection characteristics and wide out-of-band suppression characteristics, which have a certain impact on communication quality. Therefore, in order to effectively ensure low-loss signal transmission in the frequency band, a wide As a solution, the stop band improves the FSS with steep frequency selective characteristics and wide out-of-band rejection characteristics

[0003] At present, most bandpass frequency selective surfaces are mainly designed around multi-layer two-dimensional frequency selective surface cascading, mixed arrangement structure of different frequency units, fractal structure and complementary structure. There are also some problems in realizing frequency selective characteristics, such as geometric structure Too large, poor angular stability and high processing accuracy requirements, etc.

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