Open AccessSynthesis of transmission‐line filters with stubs using genetic algorithms
Author(s) -
Yamamoto Takayuki,
Sanada Hirofumi,
Takezawa Megumi,
Watanabe Kazuhisa
Publication year - 2007
Publication title -
electronics and communications in japan (part iii: fundamental electronic science)
Language(s) - English
Resource type - Journals
eISSN - 1520-6440
pISSN - 1042-0967
DOI - 10.1002/ecjc.20262
Subject(s) - filter (signal processing) , cascade , prototype filter , m derived filter , filter design , transmission line , line (geometry) , connection (principal bundle) , algorithm , transmission (telecommunications) , computer science , genetic algorithm , electronic engineering , low pass filter , topology (electrical circuits) , mathematics , engineering , telecommunications , electrical engineering , geometry , chemical engineering , machine learning , computer vision
This paper discusses the design of transmission‐line filters with stubs by using the genetic algorithm. In many cases, the transmission‐line filter is realized by connecting equal‐length elements by several transform operations starting with the lumped‐element prototype filter. In the proposed method, the determination of the filter configuration is treated as an optimization problem. A structure realizing the desired characteristics is determined by the genetic algorithm (GA). In this case, the characteristic resistance and the section length in a certain section are arbitrary. Therefore, there is no regulation of the distribution of the characteristic resistances. Also, the filter can be constructed by cascade connection of unequally long sections. As a result, it is possible to obtain filters with structures different from the conventional ones. It will be possible to realize small filters of simpler structure and filters with frequency characteristics not easily treated by the filter structure consisting of a cascade connection of equal‐length elements. The actual design of several low‐pass filters is performed and it is demonstrated that the proposed method can be used as a design approach for a transmission‐line filter. © 2006 Wiley Periodicals, Inc. Electron Comm Jpn Pt 3, 90(1): 1–8, 2007; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/ecjc.20262