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This letter presents a novel technique for synthesis of coupled-resonator filters with inter-resonator couplings varying linearly with frequency. The values of non-zero elements of the coupling matrix are found by solving a nonlinear least squares problem involving eigenvalues of matrix pencils derived from the coupling matrix and reference zeros and poles of scattering parameters. The proposed method was verified by numerical tests carried out for various coupling schemes including triplets and quadruplets for which the frequency-dependent coupling was found to produce an extra zero.
Published in:
Microwave and Wireless Components Letters, IEEE
(Volume:22
,
Issue:
6
)
Date of Publication: June 2012
- Page(s):
- 312 - 314
- ISSN :
- 1531-1309
- INSPEC Accession Number:
- 12769123
- Digital Object Identifier :
- 10.1109/LMWC.2012.2197386
- Product Type:
- Journals & Magazines
- Date of Publication :
- 17 May 2012
- Date of Current Version :
- 01 June 2012
- Issue Date :
- June 2012
- Sponsored by :
- IEEE Microwave Theory and Techniques Society
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