Download e-book for kindle: Surface Acoustic Wave Devices and Their Signal Processing by Colin Campbell

By Colin Campbell

ISBN-10: 0121573451

ISBN-13: 9780121573454

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Additional info for Surface Acoustic Wave Devices and Their Signal Processing Applications

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4 Acoustic Bulk Waves and IDT Bandwidths In S A W filter d e s i g n , there is yet a n o t h e r p r o b l e m d u e t o a c o u s t i c bulk w a v e e x c i t a t i o n . It relates t o the a m o u n t o f i n p u t p o w e r Ρ c o n v e r t e d i n t o bulk w a v e energy t h r o u g h t h e i n p u t I D T . T h u s Ρ - P + P , w h e r e P represents the p o w e r in t h e excited S A W w a v e , w h i l e P relates that c o m p o n e n t radiated as bulk w a v e s . P will b e split in s o m e w a y b e t w e e n transverse a n d l o n g i t u d i n a l m o d e s .

3 Bulk Wave Propagation Bulk w a v e s c a n b e c o n s i d e r e d as radiating f r o m e a c h excited finger o f the i n p u t I D T . A s w i t h a p h a s e d - a r r a y a n t e n n a , t h e r e f o r e , there will b e preferential r a d i a t i o n a n g l e s φ at w h i c h the radiated bulk w a v e s will b e in p h a s e w i t h m a x i m u m strength. W i t h reference t o F i g . 2 . 17) cos φ w h e r e Ρ is the I D T finger s p a c i n g b e t w e e n electrodes o f e q u a l p o l a r i t y , a n d v is the v e l o c i t y a s s o c i a t e d w i t h transverse or l o n g i t u d i n a l bulk w a v e c o m p o n e n t s , for p r o p a g a t i o n a n g l e s 0 < φ < ± 9 0 ° .

This particular transmission line model of SAW propagation on a piezoelectric surface assumes that the travelling electric field is purely longitudinal in the direction of wave propagation, to a depth on the order of one acoustic wavelength. A s a n aid t o m o d e l l i n g s o m e S A W t r a n s m i s s i o n a n d reflection p r o c e s s e s , it is a l s o c o n v e n i e n t t o u s e e q u i v a l e n t t r a n s m i s s i o n line circuit m o d e l s a n d c o n c e p t s . A s w i t h t h e electrical t r a n s m i s s i o n line c o n s i d e r e d a b o v e , t h e a c c u r a c y o f e a c h m o d e l will b e d i c t a t e d b y t h e a s s u m e d b o u n d a r y a n d transm i s s i o n c o n d i t i o n s .

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Surface Acoustic Wave Devices and Their Signal Processing Applications by Colin Campbell


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