S.A.W. bandpass filter with −50 dB sidelobes using unweighted i.d.t.s

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S.A.W. bandpass filter with −50 dB sidelobes using unweighted i.d.t.s

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© The Institution of Electrical Engineers
Published

The use of a resonantly loaded i.d.t. (r.l.i.d.t.) as an s.a.w. track changer in bandpass filter design is described. A filter with 3dB fractional bandwidth (f.b.w.) of 11.5% and −50 dB sidelobes is realised using unweighted input/output i.d.t.s of 5½ finger pairs each and a 7½ finger pair r.l.i.d.t. as the s.a.w. track changer. The scheme is expected to be useful in realising low-shape-factor low-sidelobe bandpass filters using relatively short i.d.t.s.

Inspec keywords: band-pass filters; surface acoustic wave devices

Other keywords: -50 dB sidelobes; surface acoustic wave; resonantly loaded interdigital transducer; 3 dB fractional bandwidth; SAW bandpass filter; unweighted IDT

Subjects: Acoustic signal processing; Transduction; devices for the generation and reproduction of sound; Ultrasonics, quantum acoustics, and physical effects of sound; Passive filters and other passive networks; Acoustic wave devices

References

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