Title :
Untuned low insertion loss surface leaky wave filter
Author :
Zhang, Dejing ; Shui, Y.A. ; Wu, W.Q.
Author_Institution :
Nanjing University, Institute of Acoustics, Nanjing, China
Abstract :
The letter presents a broadband low insertion loss surface leaky wave filter using reflective multistrip couplers on an optimum cut and orientation of lithium niobate. The insertion loss has been reduced to 3¿4 dB without any inductors for phase-shift networks or tuning, and the out-of-band rejection is about 23 dB. The fractional bandwidth is up to 2¿5%. The out-of-band rejection can be reduced to 40 dB, when the IDTs are apodised.
Keywords :
crystal filters; lithium compounds; passive filters; surface acoustic wave devices; IDT structure; SAW devices; SLW device; broadband; interdigital transducer; low insertion loss; optimum cut; passive filters; piezoelectric devices; reflective multistrip couplers; surface leaky wave filter; wideband;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19850395
