Title :
Parallel-coupled switched delay line (SDL) reconfigurable microwave filter
Author :
Wong, Peng W. ; Hunter, Ian C.
Author_Institution :
Sch. of Electron. & Electr. Eng., Univ. of Leeds, Leeds, UK
Abstract :
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.
Keywords :
Q-factor; microwave filters; varactors; Q factor; parallel-coupled; reconfigurable microwave filter; switched delay line; varactor loaded tunable filters; Band pass filters; Bandwidth; Degradation; Delay lines; Intermodulation distortion; Microwave filters; Narrowband; Prototypes; Q factor; Varactors; Tunable microwave filter; high linearity; low loss; reconfigurable filter; switched delay line;
Conference_Titel :
Microwave Symposium Digest, 2009. MTT '09. IEEE MTT-S International
Conference_Location :
Boston, MA
Print_ISBN :
978-1-4244-2803-8
Electronic_ISBN :
0149-645X
DOI :
10.1109/MWSYM.2009.5165746