NDLI: GHz-range low-loss wideband SAW filters using new narrow-gap floating electrode type unidirectional transducers

Content Provider	IEEE Xplore Digital Library
Author	Odagawa, H. Meguro, T. Yamanouchi, K.
Copyright Year	1996
Description	Author affiliation: Res. Inst. of Electr. Commun., Tohoku Univ., Sendai, Japan (Odagawa, H.)
Abstract	GHz-range unidirectional SAW transducers are very important for high efficiency SAW devices, for example, low loss SAW filters and high efficiency convolvers. Also, low-loss filters using unidirectional transducers (UDT) with good phase characteristics are very important for linear group delay devices, especially in digital communication systems. The frequency ranges of mobile communication systems are now 1 GHz and extending to 2.4 GHz. In the near feature, SAW devices will require the frequency range around 10 GHz. In this paper, /spl lambda//4 electrode thickness difference type single phase unidirectional transducer (ETD-SPUDT) and new narrow-gap floating electrode type single phase unidirectional transducer (NG-FEUDT) with the electrode pattern width of about /spl lambda//4 are investigated. They are fabricated by cutting part of a meander-line electrode using the shadow of the resist pattern. The theoretical and experimental results show low-loss and large directivity. Low-loss filters on 128/spl deg/ Y-X LiNbO/sub 3/ are fabricated by optical photo-lithography techniques in 2 GHz-range and by electron beam exposure in 5 GHz and 10 GHz-range. The results show a 3.0 dB insertion loss at 2 GHz, a 4.1 dB loss at 5 GHz and a 9.4 dB loss at 10 GHz.
Starting Page	188
Ending Page	193
File Size	435517
Page Count	6
File Format	PDF
ISBN	0780333098
DOI	10.1109/FREQ.1996.559842
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1996-06-05
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Wideband SAW filters Transducers Electrodes Optical losses Surface acoustic wave devices Frequency Optical filters Surface acoustic waves Convolvers
Content Type	Text
Resource Type	Article

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