• 한국군사과학기술학회지
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• 제25권2호
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• pp.135-143
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• 2022

In this paper, the compact waveguide slot array antenna for interferometric radar altimeter is proposed. The proposed antenna structure consist of corrugation structure which is applied between each channel to improve isolation, three-channel waveguide slot array antenna and feeder. In addition, to reduce the occurrence of phase ambiguity, the baseline spacing of the three-channel antenna is analyzed and the results are applied to the design. For compact design, reduced height and SMP connector structure are used and the dip brazing method which is the conjugation method after dipping to flux is used for the fabrication of the lightweight antenna. The measurement result of the proposed antenna shows less than 1.41 : 1 (VSWR) and 48.3 dBc (isolation). The antenna gain is higher than 20.2 dBi and the side lobe levels are lower than 18.8 dB (vertical plane) and 10.0 dB (horizontal plane).

• Journal of Korean Vacuum Science & Technology
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• 제4권4호
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• pp.107-111
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• 2000

We extend numerical analysis investigating the waveguide parameter dependency of the two resonant frequencies at the small-signal gain regime in a waveguide free-electron laser to the case that there exists a nonlinear coupling. The properties of the nonlinear interaction between the two resonant waves, one with higher frequency and positive slippage and the another one with lower frequency and negative slippage, are numerically investigated in the high gain regime. The results of numerical work with a set of partial differential equations describing the space and time interaction of the two resonant waves are analyzed.

• 대한전자공학회논문지TC
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• 제47권11호
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• pp.43-48
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• 2010

유전체 직각 릿지 표면 플라즈몬 도파로의 주요 파라미터인 모드 유효굴절률과 도파길이를 해석하였다. 여러 금속 및 유전체를 릿지의 폭과 두께를 변화시키며 유한요소법을 이용하여 계산하였다. 상반되는 두 파라미터를 포함하는 메트릭으로 2차원 figure of merit을 사용하였다. 계산결과를 이용하면 광통신 파장대역에서 파장이하로 모여 낮은 전파손실을 가진 도파로의 여러 파라미터 및 크기를 설계할 수 있다.

• 전기학회논문지
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• 제56권7호
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• pp.1282-1287
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• 2007

We investigated the damage of the CMOS IC which manufactured three different technologies by high power microwave. The tests separated the two methods in accordance with the types of the CMOS IC located inner waveguide. The only CMOS IC which was located inner waveguide was occurred breakdown below the max electric field (23.94kV/m) without destruction but the CMOS IC which was connected IC to line organically was located inner waveguide and it was occurred breakdown and destruction below the max electric field. Also destructed CMOS IC was removed their surface and a chip condition was analyzed by SEM. The SEM analysis of the damaged devices showed onchuipwire and bondwire destruction like melting due to thermal effect. The tested results are applied to the fundamental data which interprets the combination mechanism of the semiconductors from artificial electromagnetic wave environment and are applied to the data which understand electromagnetic wave effects of electronic equipments.

• 한국콘텐츠학회:학술대회논문집
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• 한국콘텐츠학회 2003년도 춘계종합학술대회논문집
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• pp.403-405
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• 2003

학부생들이 쉽게 사용할 수 있는 기법인 반복 그린함수 방법(IGFM)을 이용하여 복잡한 전자파 도파관 구조를 이론적으로 해석한다. IGFM은 그린함수와 반복법을 이용한다. IGFM의 간단한 공식화를 위해 단순한 수학 방정식만을 사용한 물리적인 메커니즘을 이용한다. 전형적인 전자파 도파관 구조인 평행판 E평면 T접합에 대한 산란 특성을 IGFM 관점에서 이론적으로 공식화한다. 수치해석 결과를 주파수에 대한 반사와 투과 전력 관점에서 보인다. 우세모드 해를 유도하고 그 결과를 고차모드에 의한 해와 비교한다.

• 전자공학회논문지A
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• 제32A권6호
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• pp.787-798
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• 1995

We implement the E-plane T-juncition manifold mutiplexer having low insertion loss for output multiplexer of Ku-band satellite transponder. Manifold multiplexer implemented here is composed of 2 channel filters, T-junctions, half-wave waveguide connecting channel filters and manifold, and manifold itself.[1-4] Considering the mass and volume of the satellite transponder, the channel filters are designed to dual-mode.[5-13] And Elliptic filter function is used, which has good characteristics of suppressing the interference between 2 channels. Since the performance of manifold multiplexer depends on the manifold waveguide transmission line length, it's necessary proper analysis. In this paper, we do optimization process of T-junction and other elements by using CAD and implement the manifold multiplexer. An experiment shows that characteristic response of multiplexer matches wel its modeling result.

• 한국전자파학회:학술대회논문집
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• 한국전자파학회 2002년도 종합학술발표회 논문집 Vol.12 No.1
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• pp.173-176
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• 2002

An efficient design method for E-plane waveguide bandpass filter has been developed. The analysis method for E-plane discontinuities with finite length is based on Generalized Scattering Matrix (GSM) method. Furthermore, the design portion is based on the filter synthesis method. Waveguide bandpass filters designed with this method have been fabricated and measured. Excellent agreements with design have been obtained

• 대한전자공학회논문지
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• 제26권8호
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• pp.1145-1151
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• 1989

New method to calculate the characteristics of the dominant and higher order modes of waveguide latching phase shifters are presented. Due to the tensor permeability, E and H fields inside the ferrite are expanded in terms of the LSE and LSM eigenmodes of the dielectric-slab-loaded waveguide. The equivalent coupled transmission line equations on the transverse plane are derived to obtain the dispersion characteristics and the E and H field distributions. Numerical results at X-band are compared with those published previously. The derived field distributions can be used to suppress the higher order modes of the latching phase shifters, so that the phase shift from the dominant mode only contributes the performance of the phase shifters.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1999년도 하계종합학술대회 논문집
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• pp.323-326
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• 1999

This paper describes a point matching method that is based on an expansion of the electromagnetic field in terms of a series of Bessel and modified Bessel functions multiplied by trigonometric functions. In this method, the electric and magnetic fields inside the waveguide core are matched to those outside the core at matching points on the boundary to yield matrix equations. As an example applying this method, the paper presents the results of the computation in the form of curves of the propagation constants in a semicircular optical waveguide, be formed by annealing for reduced insertion(radiation) loss when connected to optical fiber. The propagation curves are presented in a form of refractive index independent. Also, it presents relative energy distributions between inside the core and outside the core of various modes and presents field distributions.

• 전자공학회논문지A
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• 제32A권12호
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• pp.80-90
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• 1995

In this paper, methods of designing CPW(coplanar waveguide) traveling-wave electrodes are described and their properties are discussed. Especially, the effect of buffer layer thickness to the microwave characteristics of the CPW electrodes are studied in detail. The trade-off relationship between buffer layer thickness and electro-optical properties of the devices are clearly revealde. The microwave characteristics and driving voltage can be further improved by using selected parameters suggested in this paper. To reduce time and effort in designing CPW electrode structure, exact analytical models are proposed.