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Design of mobile phone IIDT-type SAW filters with block-like distribution of transducers

Title data

Fischerauer, Gerhard ; Bader, Bernhard ; Russer, Peter ; Weigel, Robert:
Design of mobile phone IIDT-type SAW filters with block-like distribution of transducers.
In: IEEE Transactions on Microwave Theory and Techniques. Vol. 42 (July 1994) Issue 7 . - pp. 1380-1386.
ISSN 0018-9480
DOI: https://doi.org/10.1109/22.299732

Official URL: Volltext

Abstract in another language

Wide band low-loss SAW filters employing interdigitated interdigital transducers (IIDT’s) and suitable for cellular radio applications are presented. After an investigation of the many design parameters that have to be taken into account, a new block-like distribution of transducers within the IIDT structure is studied in detail. This distribution leads to almost identical impedances at the filter input and output. An automatic optimization algorithm is also described. In particular, the finger numbers and the withdrawal weighting functions employed to increase the stopband rejection have been optimized by this algorithm. Filters fabricated on 36°rot Y, X-LiTaO3 exhibit fractional bandwidths of up to 5.2% with passband ripples smaller than 1 dB at a center frequency of 500 MHz. The minimum insertion loss and the stopband rejection obtained were 1.8 and 23 dB, respectively.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Engineering Science > Chair Measurement and Control Technology > Chair Measurement and Control Technology - Univ.-Prof. Dr.-Ing. Gerhard Fischerauer
Faculties
Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Measurement and Control Technology
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 25 Feb 2016 15:05
Last Modified: 25 Feb 2016 15:05
URI: https://eref.uni-bayreuth.de/id/eprint/31136