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Microwave filter design by synthesis and optimization

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2 Author(s)
Swanson, Dan ; Tyco Electron., Lowell, MA ; Macchiarella, G.

In this article, a process that might be described as "synthesis and approximation" was outlined. Starting from an exact prototype, the desired physical configuration using equivalent circuits and corrections to the resonators due to the influence of the coupling networks was approximated. A process that might be described as "approximation and optimization" was also outlined. Starting from an approximate filter network, optimization can be used to find an exact equal ripple solution. The starting point can be generated using synthesis or narrow-band approximations when appropriate. Applying optimization in an intelligent way allows the designer to circumvent some of the limitations of the classic ladder synthesis method. This article explores some ways to mix approximate filter dimensioning (based on network synthesis) and optimization (based on EM modeling), allowing a fast and accurate design of microwave filters

Published in:

Microwave Magazine, IEEE  (Volume:8 ,  Issue: 2 )

Date of Publication:

April 2007

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