A multi-IDT input tunable surface acoustic wave filter

A multi-IDT input tunable surface acoustic wave filter

Tunable surface acoustic wave (SAW) filters (TSF) have been widely used in the wireless telecommunication systems. A prototype of multi-IDT (interdigital transducer) input TSF has been developed. The device consists of 11 IDTs paralleled in the SAW propagation path. Different SAW filter configuratio...

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Veröffentlicht in:IEEE transactions on ultrasonics, ferroelectrics, and frequency control ferroelectrics, and frequency control, 2001-09, Vol.48 (5), p.1383-1388
Hauptverfasser: Jiahua Zhu, Emanetoglu, N.W., Yicheng Lu, Kosinski, J.A., Pastore, R.A.
Format: Artikel
Sprache:eng
Schlagworte:
Acoustic propagation
Acoustic transducers
Acoustic waves
Bandwidth
Devices
Ferroelectric materials
Frequency
Impedance
Interdigital transducers
Noise levels
Prototypes
Ripples
SAW filters
Surface acoustic wave devices
Surface acoustic waves
Weighting methods
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Beschreibung
Zusammenfassung:Tunable surface acoustic wave (SAW) filters (TSF) have been widely used in the wireless telecommunication systems. A prototype of multi-IDT (interdigital transducer) input TSF has been developed. The device consists of 11 IDTs paralleled in the SAW propagation path. Different SAW filter configurations are realized by selecting or combining various IDTs, resulting in the tunability of both center frequency and 3 dB bandwidth. The center frequencies of the SAW filter range from 126.8 to 199.1 MHz; the 3 dB bandwidths range from 15.2 to 58.9 MHz. Impedance weighting methods have been applied. The passband ripple has been reduced from 6.44 to 1.37 dB after resistance weighting.
ISSN:0885-3010
1525-8955
DOI:10.1109/58.949747