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Multi-band-pass terahertz band-pass filter based on frequency selective surface structure

A frequency selective surface, band-pass filter technology, applied in waveguide-type devices, optical filters, electrical components, etc., can solve the problems of weakening and disappearing filtering characteristics, and achieve low insertion loss, reduced manufacturing costs, and easy processing. Effect

Inactive Publication Date: 2015-06-03
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0005] In order to solve the technical problem that the existing terahertz band-pass filters can only perform frequency-selective filtering of a single frequency band, and are all polarization-sensitive devices, when the direction of the electric field or magnetic field is changed, the filtering characteristics are weakened or even disappear, the present invention provides A Terahertz Bandpass Filter Based on Frequency Selective Surface Structure

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[0027] Combine the following Attached picture The present invention is described in detail:

[0028] Figure 1 As shown, the multi-passband terahertz bandpass filter based on the frequency selective surface structure provided by the present invention includes a substrate dielectric substrate and two frequency selective surface layers on the upper and lower surfaces of the substrate dielectric substrate. Each frequency selective surface layer is composed of resonant units arranged in periodic square concentric metal rings, the intervals between rows and columns arranged periodically are equal, and the arrangement structure and shape of the metal resonant units in the two surface layers are the same. The upper and lower surface layers of the resonance unit are composed of three square concentric metal rings. The outermost square metal ring has a side length of P and a ring width of W1. The middle metal ring has a side length of L and a width of W2. The innermost metal ring Th...

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Abstract

The invention relates to a multi-band-pass terahertz band-pass filter based on a frequency selective surface structure, and belongs to the technical field of electromagnetic wave transmission function devices. The multi-band-pass terahertz band-pass filter is composed of an underlay dielectric substrate through which terahertz waves can be transmitted and two frequency selective surface layers which are arranged on upper surface and the lower surface of the underlay dielectric substrate; the two frequency selective surface layers are arranged oppositely and are the same in structure; each frequency selective surface layer comprises a plurality of resonance units arranged in a matrix. The multi-band-pass terahertz band-pass filter has the characteristics of three-band-pass filtering, polarization insensitivity, small insertion loss, flat band-pass ripple, remarkable out-of-band rejection, simple structure, small size and the like, and is convenient to adjust and control and easy to process.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic wave transmission functional devices, in particular to a three-pass band terahertz band-pass filter based on a frequency-selective surface structure and its design. Background technique [0002] Terahertz (THz) waves usually refer to electromagnetic waves with a frequency of 0.1-10THz (wavelength of 0.03-3mm), which is between microwave and infrared light, and has the characteristics of microwave and infrared light at the same time. It is characterized by moderate beam width and system bandwidth. Larger, very conducive to target detection and imaging, high-speed and large-capacity communication. THz waves have many characteristics that microwaves and light waves do not have. For example, THz photon energy is low, only a few millielectron volts, and will not cause damage to the detection substance. Most non-metallic non-polar materials have little absorption of THz waves, making It can be ...

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Application Information

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IPC IPC(8): H01P1/20G02B5/20
Inventor 范文慧陈徐
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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