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Considerations for dynamic temperature compensation of wideband ladder‐type SAW filter
Author(s) -
Nakamura Nobuyuki,
Komatsu Tomoya,
Omori Tatsuya,
Hashimoto KenYa,
Yamaguchi Masatsune
Publication year - 2013
Publication title -
electronics and communications in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.131
H-Index - 13
eISSN - 1942-9541
pISSN - 1942-9533
DOI - 10.1002/ecj.10420
Subject(s) - wideband , insertion loss , capacitor , bandwidth (computing) , surface acoustic wave , resonator , electronic engineering , electronic filter , materials science , acoustics , compensation (psychology) , band pass filter , optoelectronics , electrical engineering , computer science , engineering , physics , telecommunications , psychology , psychoanalysis , voltage
Because of their excellent features such as small size, wide bandwidth, and low insertion loss, ladder‐type filters based on surface acoustic wave (SAW) technology have been widely used as radio‐frequency (RF) filters in mobile communications. We can realize wide bandwidth and low insertion loss in ladder‐type SAW filters on a Cu‐grating/15°LiNbO 3 substrate structure. On the other hand, it is said that wide‐bandwidth filters have poor temperature characteristics. Therefore, this paper discusses dynamic temperature compensation for wideband ladder‐type SAW filters. First, we investigate how wide tunability is achievable using variable capacitors connected in parallel and/or series to SAW resonators in the filter configuration. Second, we measured the temperature characteristics of the resonator. Finally, we simulated temperature compensation in wideband ladder‐type SAW filters. As a result, we were able to compensate the change of the characteristics with the ladder‐type SAW filter connected using variable capacitors. © 2013 Wiley Periodicals, Inc. Electron Comm Jpn, 96(4): 61–66, 2013; Published online in Wiley Online Library (wileyonlinelibrary.com). DOI 10.1002/ecj.10420