유전자 알고리즘을 사용한 안테나 고차 변압 회로 구성과 변압 회로를 사용한 Wheeler Cap 효율 측정법 = On the Design of High Order Transformer Circuit Using the Genetic Algorithm and Its Application to the Wheeler Cap Measurement

다국어 초록 (Multilingual Abstract)

Generally, the Wheeler cap method is used to measure the efficiency of small antennas. This method often gives an unreliable efficiency when the antenna has a complicated operating principle. However, if the high-order circuit model which more closely represents the input impedance of the antenna is used in Wheeler cap method, then more accurate efficiency can be achieved. In this paper, we propose a novel method that can build the high-order circuit model using transformer circuits with the genetic algorithm(GA). To efficiently reduce the searching space in the GA and improve the convergence of the GA process, we suggest a novel scheme that finds appropriate initial values. Finally we verify the proposed method by measuring the efficiency of some passive RFID tag antennas.

참고문헌 (Reference)

1 "개선된 Wheeler Cap 방식을 이용한 안테나 효율 측정" 317-323, 2006

2 "UHF 대역 수동형 RFID 태그 안테나 설계" 872-882, 2005

3 "UHF 대역 수동형 RFID 태그 안테나 설계" 872-882, 2005

4 "Two methods for the measurement of antenna efficiency" 23 : 457-461, 1975

5 "On the Wheeler cap measurement of the efficiency of microstrip antenna" 53 : 2328-2332, 2005

6 "Genetic Algorithms in Search" 1989.

7 "Equivalent circuit modeling of UWB antennas using a modified Cauchy method" 155-, 2005

8 "Electromagnetic Optimization by Genetic Algorithms" 1999.

9 "Comparison of three methods for the measurement of printed antenna efficiency" 36 : 136-139, 1988

10 "An analysis of the wheeler method for measuring the radiation efficiency of antennas" 25 : 552-556, 1977