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평면형 패치 안테나의 최적설계를 위한 PSO와 APSO 알고리즘 비교 연구
김군태(Koon-Tae Kim),김형석(Hyeong-Seok Kim) 대한전기학회 2013 전기학회논문지 Vol.62 No.11
In this paper, stochastic optimization algorithms of PSO (Particle Swarm Optimization) and APSO (Adaptive Particle Swam Optimization) are studied and compared. It is revealed that the APSO provides faster convergence and better search efficiency than the conventional PSO when they are adopted to find the global minimum of a two-dimensional function. The advantages of the APSO comes from the ability to control the inertia weight, and acceleration coefficients. To verify that the APSO is working better than the standard PSO, the design of a 10㎓ microstrip patch as one of the elements of a high frequency array antenna is taken as a test-case and shows the optimized result with 5 iterations in the APSO and 28 iterations in th PSO.
SRR과 등가회로 모델링을 이용한 적층 PCB의 임피던스 저감 연구
김군태(Koon-Tae Kim),이제광(Je-Kwang Lee),최규태(Gyu-Tae Choi),김형석(Hyeong-Seok Kim) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
This paper deals with an equivalent circuit model for PCB models. Rational functions are obtained from the frequency responses of EM simulation by using partial fraction expressions. The adaptive frequency sampling(AFS) method also implemented to obtain the rational functions. The equivalent circuit model could find characteristics of PCB using time domain reflectometry(TDR) simulations. And it will be used to analyze complex 3D EM structures
진화전략 기법을 이용한 19.05㎓ 고이득 4×4 배열 안테나 최적설계
김군태(Koon-Tae Kim),권소현(So-Hyun Kwon),고재형(Jae-Hyeong Ko),김형석(Hyeong-Seok Kim) 대한전기학회 2011 전기학회논문지 Vol.60 No.4
In this paper, we propose a optimal design using the Evolution Strategy of a high gain 4x4 array antenna that have the resonant frequency of a 19.05㎓ with 18.86㎓~19.26㎓ bandwidth. The proposed array antenna structure is designed to be allocated equally electric power by microstrip patch power splitter. Thus the optimal array antenna with power splitter are determined by using an optimal design program based on the evolution strategy. To achieve this, an interface program between a commercial EM analysis tool and the optimal design program is constructed for implementing the evolution strategy technique that seeks a global optimum of the objective function through the iterative design process consisting of variation and reproduction. The simulation result of 4×4 array antenna is confirmed that the Gain is 19.36 dBi at resonance frequency 19.05㎓.
김군태(Koon-Tae Kim),고재형(Jae-Hyeong Ko),백현(Hyun Paek),권소현(So-Hyun Kwon),김형석(Hyeong-Seok Kim) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
본 논문에서는 SIR(Stepped Impedance Resonator)를 이용하여 RFID 주파수 대역의 이중대역 필터를 설계 연구하였다. 반파장 SIR을 parallel-coupled 형태로 설계하고 넓은 주파수 간격의 이중대역 필터를 구현하기 위해서 2st 공진 주파수를 2.45㎓ 대역에 맞추고 1st 공진 주파수를 억제하기 위해서 대역저지 필터를 결합하였다. 입출력에 대역 저지 필터를 구성하고 반파장 parallel-coulpled SIR은 미앤더 구조로 설계하여 크기를 줄였다. 본 논문에서 설계된 필터는 두 대역에서 -3.5~3.9㏈의 삽입 손실을 가지며 433㎒에서 8㎒, 2.45㎓에서 21㎒의 대역폭을 나타낸다. 관심 주파수 이외의 대역에서는 -50㏈ 이 상의 저지 특성을 가진다.
진화 알고리즘을 이용한 삼중대역 PIFA 최적 설계에 관한 연구
고재형(Jae-Hyeong Ko),김군태(Koon-Tae Kim),김경아(Kyong-Ah Kim),김형석(Hyeong-Seok Kim) 대한전기학회 2010 전기학회논문지 Vol.59 No.4
In this paper, we study on an optimal design of a triple-band PIFA (Planar Inverted-F Antenna) of 433 ㎒, 912 ㎒ and 2.45 ㎓ by using evolution strategy. Generally, the resonant frequency of the PIFA is determined by the width and length of a U-type slot used. However the resonant frequencies of the multiple U slots are varied by the mutual effect of the slots. Thus the optimal width and length of U-type slots are determined by using an optimal design program based on the evolution strategy. To achieve this, an interface program between a commercial EM analysis tool and the optimal design program is constructed for implementing the evolution strategy technique that seeks a global optimum of the objective function through the iterative design process consisting of variation and reproduction. The resonant frequencies of initial model are 439.5 ㎒, 981.5 ㎒ and 2.563 ㎓. However, the resonant frequencies of the triple-band PIFA yielded by the optimal design program are 430.5 ㎒, 907 ㎒ and 2.4515 ㎓. Measured resonant frequencies are 433.5 ㎒, 905.5 ㎒ and 2.454GHz, which show a good agreement with the simulation results.