Design of multiple-passband filters using coupling matrix optimisation
This study presents the design of microwave filters based on the coupling matrix approach; determination of the matrix is based on a hybrid optimisation algorithm which may be applied to cross-coupled filters having diverse topologies. Various filter responses from dual-band to quad-band are given a...
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Published in | IET microwaves, antennas & propagation Vol. 6; no. 1; pp. 24 - 30 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Stevenage
Institution of Engineering and Technology
01.01.2012
The Institution of Engineering & Technology |
Subjects | |
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Abstract | This study presents the design of microwave filters based on the coupling matrix approach; determination of the matrix is based on a hybrid optimisation algorithm which may be applied to cross-coupled filters having diverse topologies. Various filter responses from dual-band to quad-band are given as examples of the approach. The optimisation is performed on the coupling matrix and a genetic algorithm (GA) is employed to generate initial values for the control variables for a subsequent local optimisation. The novel cost function in this study measures the difference of the frequency locations of reflection and transmission zeros between the response produced by the coupling matrix and the ideal response. Convergence of the coupling matrix optimisation is fast, and no initial values for the control parameters are required by the GA. An eighth-order X-band dual-band waveguide filter with all-capacitive-coupling irises has been fabricated and measured to verify the design technique. An excellent agreement between simulation and experimental result has been achieved. |
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AbstractList | This study presents the design of microwave filters based on the coupling matrix approach; determination of the matrix is based on a hybrid optimisation algorithm which may be applied to cross-coupled filters having diverse topologies. Various filter responses from dual-band to quad-band are given as examples of the approach. The optimisation is performed on the coupling matrix and a genetic algorithm (GA) is employed to generate initial values for the control variables for a subsequent local optimisation. The novel cost function in this study measures the difference of the frequency locations of reflection and transmission zeros between the response produced by the coupling matrix and the ideal response. Convergence of the coupling matrix optimisation is fast, and no initial values for the control parameters are required by the GA. An eighth-order X-band dual-band waveguide filter with all-capacitive-coupling irises has been fabricated and measured to verify the design technique. An excellent agreement between simulation and experimental result has been achieved. |
Author | NICHOLSON, G. L LANCASTER, M. J SHANG, X WANG, Y |
Author_xml | – sequence: 1 givenname: X surname: SHANG fullname: SHANG, X organization: School of Electrical, Electonic and Computer Engineering, The University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom – sequence: 2 givenname: Y surname: WANG fullname: WANG, Y organization: School of Electrical, Electonic and Computer Engineering, The University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom – sequence: 3 givenname: G. L surname: NICHOLSON fullname: NICHOLSON, G. L organization: School of Electrical, Electonic and Computer Engineering, The University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom – sequence: 4 givenname: M. J surname: LANCASTER fullname: LANCASTER, M. J organization: School of Electrical, Electonic and Computer Engineering, The University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom |
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Keywords | Waveguide filters Return loss X band Characteristic polynomial Iterative method Centimetric wave Specification Microwave filter Quadratic programming Transmission zero Optimization Multi-band circuit Difference frequency Simulation Genetic algorithm Sequential method Band pass filter Cost function Matrix method Capacitive coupling Localization Interconnected system |
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SubjectTerms | Applied sciences Circuit properties Convergence Electric, optical and optoelectronic circuits Electronic circuits Electronics Exact sciences and technology Frequency filters Genetic algorithms Joining Microwave antennas Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits Optimization Reflection Waveguide filters X-band |
Title | Design of multiple-passband filters using coupling matrix optimisation |
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