In:
Japanese Journal of Applied Physics, IOP Publishing, Vol. 37, No. 5S ( 1998-05-01), p. 2933-
Abstract:
Elastic convolvers are very important in signal processing devices of spread spectrum communication (SSC) systems. Highly efficient convolvers are required in the application of the spread spectrum and next stage communication systems. A high value of the coupling coefficient is very important for wideband and high efficiency surface acoustic wave (SAW) devices, such as SAW convolvers. Potassium niobate (KNbO 3 ) has large piezoelectric constants and a very large electromechanical coupling coefficient ( K 2 ) of 0.53 for surface acoustic waves, which is about 10 times higher than that of LiNbO 3 . Therefore, highly efficient elastic SAW convolvers using KNbO 3 substrates are expected in the future. In this paper, the use of the rotated 60° Y-cut, X-propagating KNbO 3 substrates in convolvers is demonstrated. The experimental results show that the efficiency of the convolver using 60° Y–X KNbO 3 is 15 dB higher than that of the convolver using Y–Z LiNbO 3 .
Type of Medium:
Online Resource
ISSN:
0021-4922
,
1347-4065
DOI:
10.1143/JJAP.37.2933
Language:
Unknown
Publisher:
IOP Publishing
Publication Date:
1998
detail.hit.zdb_id:
218223-3
detail.hit.zdb_id:
797294-5
detail.hit.zdb_id:
2006801-3
detail.hit.zdb_id:
797295-7
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