Title :
Using SPUDT structure to design high selectivity W-CDMA base station filters
Author :
Pyman, A.C. ; Deacon, J.M. ; Gibson, W. ; Bains, R.S. ; Galipeau, J.D. ; Lindemayer, T.M. ; Bi, F.Z.
Author_Institution :
Micro Networks, Dorcan, Swindon, UK
Abstract :
Two weighting algorithms for SPUDT structures have been developed. By being able to approximate a complex-valued time response at one sample per wavelength, these new algorithms can compensate for passband slope and other distortions. A withdrawal-weighting (WW) algorithm has been applied to filters with about 2% fractional bandwidth. For improved stop band rejection, an apodization algorithm has also been developed for the design of wideband CDMA SPUDT filters with up to 5% fractional bandwidth
Keywords :
UHF filters; band-pass filters; code division multiple access; surface acoustic wave filters; ultrasonic transducers; SPUDT structure; W-CDMA base station filters; apodization algorithm; complex-valued time response; fractional bandwidth; high selectivity filters; passband slope distortions; stop band rejection; withdrawal-weighting algorithm; Acoustic distortion; Band pass filters; Bandwidth; Base stations; Fingers; Frequency response; Multiaccess communication; Passband; Time factors; Transducers;
Conference_Titel :
Ultrasonics Symposium, 2001 IEEE
Conference_Location :
Atlanta, GA
Print_ISBN :
0-7803-7177-1
DOI :
10.1109/ULTSYM.2001.991626
