Parallel-coupled switched delay line (SDL) reconfigurable microwave filter

Conventional realizations of varactor-loaded tunable filters exhibit high losses due to the degradation of Q factor caused by varactor's losses. These filters also suffer from nonlinear-related problems such as intermodulation distortion due to varactor nonlinearity. In this paper, a new class...

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Bibliographic Details
Published in2009 IEEE MTT-S International Microwave Symposium Digest pp. 513 - 516
Main Authors Wong, P.W., Hunter, I.C.
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.06.2009
Subjects
Band pass filters
Bandwidth
Degradation
Delay lines
high linearity
Intermodulation distortion
low loss
Microwave filters
Narrowband
Prototypes
Q factor
reconfigurable filter
switched delay line
Tunable microwave filter
Varactors
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Summary:Conventional realizations of varactor-loaded tunable filters exhibit high losses due to the degradation of Q factor caused by varactor's losses. These filters also suffer from nonlinear-related problems such as intermodulation distortion due to varactor nonlinearity. In this paper, a new class of parallel-coupled SDL reconfigurable filter is shown. Theoretical analysis together with experimental prototype is presented. The filter provides narrowband quasi-elliptic filter response with constant bandwidth (50 MHz) tuning across 45% tuning range. The minimum stopband rejection level is 45 dB and it possesses passband loss of < 4 dB and an IP3 of >32 dBm for deltaf = 1 MHz.
ISBN:1424428033
9781424428038
ISSN:0149-645X
2576-7216
DOI:10.1109/MWSYM.2009.5165746