Design of SAW filters in SS-FDMA routers for mobile satellite systems
Abstract
The present paper reports the design of a SAW filter bank consisting of 26 linear phase filters with bandwidths ranging from 60 to 2180 kHz, 0.5/40 dB transition width narrower than 30 kHz, and stopband rejection as high as possible. Passbank amplitude and phase ripple limits are 1 dB and 4 deg peak-to-peak respectively. Three candidate filters of bandwidth 60 kHz, 400 kHz and 2.180 MHz were selected for detailed design, taking into account spurious effects such as acoustic regeneration and diffraction as well as technology limits. The electrical specifications are met by all but the 2180 kHz filter, whose shape factor, for a 30 kHz transition band, would be 1.027 : 1, beyond the state of the art. The filter bank has about 27 dB insertion loss per filter, plus roughly 14 dB (1 : 26) power split loss.
- Publication:
-
International Journal of Satellite Communications
- Pub Date:
- November 1989
- Bibcode:
- 1989IJSC....7..321A
- Keywords:
-
- Frequency Division Multiple Access;
- Interdigital Transducers;
- Linear Filters;
- Mobile Communication Systems;
- Satellite Communication;
- Surface Acoustic Wave Devices;
- Bandwidth;
- Digital Filters;
- Fir Filters;
- Frequency Response;
- Insertion Loss;
- Narrowband;
- Onboard Data Processing;
- Electronics and Electrical Engineering