NDLI: Reflector-filter using an SAW waveguide directional coupler for IF applications in CDMA system

Content Provider	IEEE Xplore Digital Library
Author	Tsutsumi, J. Matsuda, T. Ikata, O. Satoh, Y.
Copyright Year	1999
Description	Author affiliation: Fujitsu Labs. Ltd., Akashi, Japan (Tsutsumi, J.)
Abstract	The reflector-filter design is an attractive technique to obtain steep skirt characteristics in a short chip length because the SAW propagation path is folded and the frequency response is synthesized by utilizing both IDT and reflector responses. In this paper, we propose a new reflector-filter structure using an SAW waveguide directional coupler to realize small-size CDMA IF filters. For the implementation of proposed reflector-filter, the key technology is the design of SAW waveguides. An Al grating, which has the stopband kept away from that of IDTs, is first employed to form a low-loss waveguide. The directional coupler is composed of two Al grating waveguides, and the coupling property is verified. Using the proposed reflector-filter structure, PCS-CDMA IF filters are fabricated on quartz substrates. The filter exhibits an insertion loss of 8.5 dB and fulfils the specified frequency response. The package size is 4.8/spl times/9.1 mm and a size half that of a conventional transversal filter is achieved.
Starting Page	932
Ending Page	935
File Size	284340
Page Count	4
File Format	PDF
ISBN	0780354001
ISSN	10756787
DOI	10.1109/FREQ.1999.841457
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1999-04-13
Publisher Place	France
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Directional couplers Gratings Surface acoustic waves Artificial intelligence Filters Temperature Insertion loss Stability Waveguide discontinuities Surface waves
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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