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Multi-objective optimisation technique for coupling matrix synthesis of lossy filters
     
  
  
刊名:
IET Microwaves, Antennas & Propagation
作者:
Yuting Zhao
(Department of Electronic Engineering and Information Science, University of Science and Technology of China)
Gang Wang
(Key Laboratory of Electromagnetic Space Information, University of Science and Technology of China)
刊号:
730C0004-H
ISSN:
1751-8725
出版年:
2013
年卷期:
2013, vol.7, no.11
页码:
926-933
总页数:
8
分类号:
TN8; TN925; TM
语种:
eng
文摘:
Coupling matrix synthesis technique based on multi-objective evolutionary algorithm (MOEA) is proposed for pseudoelliptic low-pass filter prototypes with lossy resonators and arbitrary topology. MOEA-based synthesis can deal with multi-objective functions so that different filter characteristics of high-performance lossy filter, such as return loss, out of band rejection and passband flatness, can be optimised simultaneously. In the proposed MOEA-based lossy filter synthesis, a chromosome pair coding model is defined to treat real and imaginary parts of complex coupling matrix of a lossy filter, and additional constraints on Q-factor to characterise lossy resonator in the filter are applied. For demonstration, non-dominated sorting genetic algorithm II with extended arithmetic crossover and adaptive mutation operator are used to synthesise three symmetric/asymmetric lossy filters. The results indicate that the proposed MOEA-based synthesis technique can provide perfect passband ripple as required in high-performance microwave filters.
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