Dual polarization broadband external inhibition three-dimensional frequency selective surface

Abstract

The invention discloses a dual polarization broadband external inhibition three-dimensional frequency selective surface. The frequency selective surface is of a three-dimensional periodic structure processed by a dielectric substrate, and comprises a square coaxial line waveguide and a parallel slab waveguide. The surface of the dielectric substrate is provided with metal patches, rectangular grooves are formed in two ends of each metal patch in the propagation direction of electromagnetic waves, and metal via holes in the dielectric substrate are connected to the metal patches on two sides. Adual mode resonator is formed by the parallel slab waveguide, a passband containing two transmission poles is generated, and due to the interaction between the two waveguides, a wide stop band containing two transmission zero points is generated near the passband. The frequency selective surface has low polarization sensitivity in a dual polarization operating mode, the frequency ranges of the passband and the stop band can be controlled by changing relevant physical parameters, dual polarization application is realized, and the frequency selective surface has high 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 cross-section of various aircrafts, missiles, satellites, etc. equipped with radar sensors 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 can also be applied ...

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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