KR-20260067904-A - METAMATERIAL RESONATOR AND WAVEGUIDE BAND-PASS FILTER INCLUDING THE SAME

KR20260067904AKR 20260067904 AKR20260067904 AKR 20260067904AKR-20260067904-A

Abstract

A metamaterial resonator according to one embodiment of the technical concept of the present disclosure comprises a first metamaterial resonant element extending in a vertical direction and a second metamaterial resonant element extending in a horizontal direction and intersecting the first metamaterial resonant element, and in terms of one cross-sectional area, the first metamaterial resonant element and the second metamaterial resonant element form a cross shape.

Inventors

조지행
박경열
임철민
윤익재
김원교

Assignees

국방과학연구소

Dates

Publication Date: 20260513
Application Date: 20241106

Claims (18)

A first metamaterial resonance element extending in the vertical direction; and A second metamaterial resonance element extending in a horizontal direction and intersecting the first metamaterial resonance element; Includes, A metamaterial resonator in which, from the perspective of one cross-sectional area, the first metamaterial resonant element and the second metamaterial resonant element form a cross shape.
In Article 1, A metamaterial resonator in which the length in the vertical direction of the first metamaterial resonant element is different from the length in the horizontal direction of the second metamaterial resonant element.
In Article 1, The first metamaterial resonant element includes an overlapping segment that overlaps with the second metamaterial resonant element, and non-overlapping segments spaced apart from each other along the vertical direction with the overlapping segment in between. A metamaterial resonator in which the vertical lengths of at least two of the above-mentioned overlapping segments and the above-mentioned non-overlapping segments are different.
In Article 1, The second metamaterial resonance element comprises an overlapping segment that overlaps with the first metamaterial resonance element, and non-overlapping segments spaced apart from each other along the horizontal direction with the overlapping segment in between. The length of the above-mentioned overlapping segment in the horizontal direction is different from the length of the above-mentioned non-overlapping segments in the horizontal direction, and A metamaterial resonator in which the horizontal lengths of each of the above-mentioned non-overlapping segments are equal to each other.
In Article 1, A metamaterial resonator in which the first cross-section perpendicular to the vertical direction of the first metamaterial resonant element and the second cross-section perpendicular to the horizontal direction of the second metamaterial resonant element are each square in shape.
In Article 5, A metamaterial resonator in which the area of the first cross-section is constant along the vertical direction and the area of the second cross-section is constant along the horizontal direction.
Article 1 The first metamaterial resonance element and the second metamaterial resonance element are integrally formed, forming a metamaterial resonator.
Article 7 A metamaterial resonator comprising the first metamaterial resonant element and the second metamaterial resonant element, the base and a metal thin film covering the surface of the base.
A waveguide extending in a first horizontal direction; and A plurality of metamaterial resonators arranged along the first horizontal direction in the internal space of the waveguide; Includes, Each of the above plurality of metamaterial resonators is, It includes a first metamaterial resonance element extending in a vertical direction and a second metamaterial resonance element extending in a second horizontal direction perpendicular to the first horizontal direction and intersecting with the first metamaterial resonance element, A waveguide bandpass filter in which, from the perspective of one cross-sectional area, the first metamaterial resonant element and the second metamaterial resonant element form a cross shape.
In Article 9, A waveguide bandpass filter in which at least some of the plurality of metamaterial resonators are arranged to be spaced apart at inconsistent intervals in the first horizontal direction.
In Article 9, A waveguide bandpass filter in which the plurality of metamaterial resonators are arranged such that the metamaterial resonators on one side and the metamaterial resonators on the other side are mirror-symmetric with respect to an imaginary line crossing the center of the waveguide.
In Article 11, The spacing between the metamaterial resonators on the above-mentioned side gradually increases along the first direction, and A waveguide bandpass filter in which the spacing between the metamaterial resonators on the other side gradually decreases along the first direction.
In Article 9, A waveguide bandpass filter, wherein the plurality of metamaterial resonators are arranged in the internal space of the waveguide such that one end of the first metamaterial resonant element is spaced apart from one of the inner surfaces of the waveguide facing each other in the vertical direction, and both ends of the second metamaterial resonant element are spaced apart from the inner surfaces of the waveguide facing each other in the second horizontal direction.
In Article 13, A waveguide bandpass filter in which the spacing between one end of the first metamaterial resonant element and one of the inner surfaces of the waveguide facing each other in the vertical direction is greater than the spacing between both ends of the second metamaterial resonant element and the inner surfaces of the waveguide facing each other in the second horizontal direction.
In Article 9, The above waveguide includes an input section, a filter section, and an output section, and The plurality of metamaterial resonators mentioned above are located in the filter section, and A waveguide bandpass filter, wherein at least one of the input section and the output section comprises a metamaterial port configured to couple an electromagnetic wave signal to the plurality of metamaterial resonators.
In Article 15, The above metamaterial port is, It includes first and second metamaterial port elements extending in the vertical direction, and third metamaterial port elements extending in the second horizontal direction and intersecting with the first and second metamaterial port elements, A waveguide bandpass filter in which, from the perspective of one cross-sectional area, the first and second metamaterial port elements and the third metamaterial port element form a double cross shape.
In Article 9, The above waveguide and the plurality of metamaterial resonators are integrally formed, a waveguide bandpass filter.
Article 17 The above waveguide and the plurality of metamaterial resonators are a waveguide bandpass filter comprising a base and a metal thin film covering the surface of the base.

Description

Metamaterial Resonator and Waveguide Band-Pass Filter Including the Same The technical concept of the present disclosure relates to a metamaterial resonator and a waveguide bandpass filter including the same. Waveguide filters, particularly waveguide bandpass filters, are core components of wireless communication devices for satellites and aerospace communications. Recently, there has been a demand for reductions in the size and weight of waveguide bandpass filters due to the need for miniaturization and lightweighting in communication payloads, including microsatellites such as Low Earth Orbit (LEO) satellites, as well as geostationary and medium-orbit satellites and aircraft. Accordingly, research is being conducted to realize lightweight waveguide filters by utilizing 3D printing technology and metal coating technology in order to find an alternative to the CNC (Computer Numerical Control) machining method, which has disadvantages in terms of weight and cost as a manufacturing method for general waveguide filters. For example, a waveguide bandpass filter with a metastructure applied using 3D printing technology and metal coating technology can be cited. The waveguide bandpass filter has a structure in which a pin-type LRM (Locally Resonant Metamaterial, LRM) resonator with a resonant frequency (fr) is added to a waveguide having a cutoff frequency (fc), and resonance is utilized at a spacing between resonators shorter than half the wavelength of the electromagnetic wave. The aforementioned waveguide bandpass filter has the advantage of being able to be designed with a reduced length compared to waveguide bandpass filters that do not apply a metastructure. However, there are limitations in implementing high performance, such as steep skirt characteristics (high Out-Of-Band (OOB) rejection performance). To improve OOB rejection performance, the width of the filter section must be reduced; however, this is because reducing the filter section width narrows the passband and imposes constraints on matching at the transition portion due to increased discontinuity characteristics in the input/output sections (flanges). Therefore, measures to resolve such problems are required. A brief description of each drawing is provided to help to better understand the drawings cited in the present disclosure. FIG. 1 is a perspective view showing a waveguide bandpass filter according to one embodiment of the present disclosure. FIG. 2 is a plan view showing a waveguide bandpass filter according to one embodiment of the present disclosure. FIGS. 3 and 4 are drawings for illustrating a metamaterial resonator of a waveguide bandpass filter according to one embodiment of the present disclosure. FIG. 5 is a graph showing the dispersion of a metamaterial resonator according to one embodiment of the present disclosure. FIG. 6 is a graph showing the electric field storage energy density and impedance characteristics of a metamaterial resonator according to one embodiment of the present disclosure and a conventional metamaterial resonator. FIG. 7 is a graph showing the simulation results of the transmission coefficients of a metamaterial resonator according to one embodiment of the present disclosure and a conventional metamaterial resonator. FIGS. 8 and 9 are drawings for illustrating a metamaterial port of a waveguide bandpass filter according to one embodiment of the present disclosure. FIG. 10 is a graph showing the results of simulating the reflection coefficient and transmission coefficient of a waveguide bandpass filter according to one embodiment of the present disclosure. Exemplary embodiments according to the technical concept of the present disclosure are provided to more fully explain the technical concept of the present disclosure to those skilled in the art, and the following embodiments may be modified in various different forms, and the scope of the technical concept of the present disclosure is not limited to the following embodiments. Rather, these embodiments are provided to make the present disclosure more faithful and complete and to fully convey the technical concept of the present invention to those skilled in the art. In this disclosure, terms such as "first," "second," etc. are used to describe various members, regions, layers, parts, and/or components; however, it is obvious that these members, parts, regions, layers, parts, and/or components should not be limited by these terms. These terms do not imply a specific order, hierarchy, or superiority, and are used solely to distinguish one member, region, part, or component from another. Accordingly, the first member, region, part, or component described below may refer to the second member, region, part, or component without departing from the teachings of the technical concept of this disclosure. For example, without departing from the scope of rights of this disclosure, the first component may be named the second component, and similarly, the second componen