NDLI: Non-reflective electrode cell for SAW with quarter-wavelength electrodes

Content Provider	IEEE Xplore Digital Library
Author	Biryukov, S.V. Martin, G. Schmidt, H. Weihnacht, M.
Copyright Year	2012
Description	Author affiliation: IFW Dresden, Dresden, Germany (Biryukov, S.V.; Martin, G.; Schmidt, H.; Weihnacht, M.)
Abstract	Non-reflective interdigital transducers (IDTs) for surface acoustic waves (SAWs) are important elements for development of SAW devices with precise frequency responses. Until now a common way to have a non-reflective periodic cell of IDT at the resonance frequency is to use split electrodes with periodicity P/4 and finger width P/8, where P is the IDT period equal to the SAW wavelength. But for 2.45 GHz (ISM frequency band), standard lithography allows electrode (and gap) widths only to be about quarter-wavelength. Thus, a new structure solution for non-reflective IDT is required for high frequencies. A novel solution for non-reflective cell with two quarter-wavelength electrodes per one-wavelength period is based on 2D-periodic structure consisting of alternating active IDT tracks and passive reflector tracks. If tracks have equal apertures and if electrodes in adjacent tracks are shifted to each other by P/4, SAWs reflected from electrodes in adjacent tracks have equal amplitudes but with phases shifted by a half wavelength. So the reflected waves cancel each other and the total reflection from the structure should be equal to zero.
Starting Page	1786
Ending Page	1789
File Size	792137
Page Count	4
File Format	PDF
ISBN	9781467345613
ISSN	19485719
e-ISBN	9781467345620
DOI	10.1109/ULTSYM.2012.0448
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-10-07
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Electrodes Resonant frequency Apertures Surface acoustic waves Reflection coefficient Periodic structures Surface acoustic wave devices
Content Type	Text
Resource Type	Article

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