http://iet.metastore.ingenta.com
1887

Model for s.a.w. scattering by i.d.t. and its application to s.a.w. track changer

Model for s.a.w. scattering by i.d.t. and its application to s.a.w. track changer

For access to this article, please select a purchase option:

Buy article PDF
$19.95
(plus tax if applicable)
Buy Knowledge Pack
10 articles for $120.00
(plus taxes if applicable)

IET members benefit from discounts to all IET publications and free access to E&T Magazine. If you are an IET member, log in to your account and the discounts will automatically be applied.

Learn more about IET membership 

Recommend Title Publication to library

You must fill out fields marked with: *

Librarian details
Name:*
Email:*
Your details
Name:*
Email:*
Department:*
Why are you recommending this title?
Select reason:
 
 
 
 
 
IEE Journal on Microwaves, Optics and Acoustics — Recommend this title to your library

Thank you

Your recommendation has been sent to your librarian.

A superposition model for surface-acoustic-wave (s.a.w.) scattering by an interdigital transducer (i.d.t.) has been developed. In essence, it consists of two steps, (a) The incident s.a.w. induces a voltage across the i.d.t. (b) The bidirectionally radiated s.a.w., due to this induced voltage, is superposed with the incident s.a.w. to yield the scattered s.a.w. field. It is shown to considerably simplify the s.a.w. scattering parameter calculations for i.d.t. The results agree with earlier observations. Scattering parameter calculations of nonuniformly illuminated, resonantly loaded hybrid-junction i.d.t.s (r.l.h.i.d.t.) show that (i) s.a.w.s are unidirectionally radiated over the unilluminated part of the h.i.d.t. and (ii) it is described by a (track-changing) transfer function of bandpass type, with flat bandwidths up to 20% of nearly 0 dB loss, under appropriate conditions. The r.l.h.i.d.t. track changer should, therefore, be useful in realising long delay lines. The attractive feature of the r.l.h.i.d.t. as an s.a.w. track changer is that its implementation is practically feasible even on a low piezoelectric-coupling substrate like ST quartz. However, its main disadvantages are the requirement of (a) multilevel high-resolution lithography and (b) the additional high-Q tuning inductors for resonant loading.

References

    1. 1)
      • W.R. Smith , H.M. Gerard , J.H. Collins , T.M. Reeder , H.J. Shaw . Analysis of interdigital surface wave transducers by use of an equivalent circuit model. IEEE Trans. , 856 - 864
    2. 2)
      • S.G. Joshi , P. Sudhakar . Scattering parameters of interdigital surface acoustic wave transducers. IEEE Trans. , 201 - 205
    3. 3)
      • S.G. Joshi , R.M. White . Excitation and detection of surface elastic waves in piezoelectric crystals. J. Accoust. Soc. Am. , 17 - 27
    4. 4)
      • P. Sudhakar , A.B. Bhattacharyya , Bimal Mathur . An s.a.w. bandpass filter with — 50 dB sidelobes using unweighted i.d.t.s. Electron. Lett , 437 - 439
    5. 5)
      • Matthaei, G.L., Hoiem, B.E., Krimholtz, R.S., Hanson, B.A.: `Non-reflecting surface acoustic wave filters and switching devices', Proceedings of the IEEE Ultrasonics Symposium, 1972, p. 381–383.
    6. 6)
      • F.G. Marshall , C.O. Hewion , E.G.S. Paige . Surface acoustic wave multistrip components and their applications. IEEE Trans. , 216 - 225
    7. 7)
      • Puttagunta, Sudhakar: `Physical modelling of surface acoustic wave (s.a.w.) interdigital transducers and its application to the design of s.a.w. track changers and bandpass filters', January 1979, Ph.D. thesis, Indian Institute of Technology, Delhi, India.
    8. 8)
      • W.R. Smith , H.M. Gerard , J.H. Collins , T.M. Reeder , H.J. Shaw . Design of surface wave delay lines with interdigital transducers. IEEE Trans. , 865 - 873
    9. 9)
      • T.M. Reeder , W.R. Sperry . Broad-band coupling to high-Q resonant loads. IEEE Trans. , 453 - 458
    10. 10)
      • de Vries, A.J., Miller, R.L., Wojcik, T.J.: `Reflection of a surface wave from three types of ID transducers', Proceedings of the IEEE Ultrasonics Symposium, 1972, p. 343–345.
http://iet.metastore.ingenta.com/content/journals/10.1049/ij-moa.1979.0028
Loading

Related content

content/journals/10.1049/ij-moa.1979.0028
pub_keyword,iet_inspecKeyword,pub_concept
6
6
Loading
This is a required field
Please enter a valid email address