Title :
Frequency-dependent behaviour of an acoustic-surface-wave multistrip coupler
Author :
Maines, J.D. ; Marshall, F.G. ; Oliver, J.F.C. ; Paige, E.G.S.
Author_Institution :
Royal Radar Establishment, Great Malvern, UK
Abstract :
The distribution of acoustic intensity within a surface-wave multistrip coupler on lithium niobate has been observed using a laser probe. The number of metal strips required for complete transfer of energy between coupled tracks has been determined as a function of acoustic frequency. Two stopbands were observed in the frequency range explored. A simple analytic expression is presented which is in good agreement with experiment away from the vicinity of the stopbands. It may be regarded as useful for coupler design; it is used to demonstrate that the 3 dB fractional bandwidth of the coupler may exceed 120%.
Keywords :
acoustic microwave devices; directional couplers; strip line components; surface phenomena; acoustic frequency; acoustic intensity; acoustic microwave devices; coupled tracks; directional couplers; laser probe; multistrip coupler; stopbands; strip line components; surface phenomena; surface wave multistrip coupler;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19720060
