High Performance SAW Filters with Several New Technologies for Cellular Radio

Hikita, M.; Tabuchi, T.; Kojima, H.; Sumioka, A.; Nakagoshi, A.; Kinoshita, Y.

doi:10.1109/ultsym.1984.198268

Cited by 34 publications

(2 citation statements)

References 17 publications

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“…have been presented [7,8] on bulk substrates. In this For low loss and wide band devices, IIDT structures paper, the characteristics of the IIDT structure on ZnOlDiamondlSi including velocity dispersion are discussed.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of IIDT on ZnO/diamond/Si structures

Hachigo

Malocha²,

Richie³

1996 IEEE Ultrasonics Symposium. Proceedings

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Characteristics of interdigitated interdigital transducer (IIDT) structure on ZnOidiamondlSi structures are discussed including velocity dispersion. The pass band width and the null frequency band width of the IWT structure are narrower than that of non dispersive surface acoustic wave (SAW) velocity because of the velocity dispersion. A comparison of the velocity dispersive case with the non velocity dispersive case for sidelobe reduction for the IIDT structure will be presented.

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Section: Introductionmentioning

confidence: 99%

Characteristics of IIDT on ZnO/diamond/Si structures

Hachigo

Malocha²,

Richie³

1996 IEEE Ultrasonics Symposium. Proceedings

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“…This filter structure [ Figure 11 makes the passband width and shape closely dependent on the piezoelectric material parameters such as the coupling coefficient k2 and the mechanical reflection constant: Allowed maximum bandwidth is about k2/1.5 [2] and the number of finger pairs for zero susceptance of the coupling transducers is about 1.5/k2. This last condition requires operation in the transducer stopband region for which analysis is complicated if a non pure surface nature of the acoustic wave is used and may be disturbed by a negative mechanical reflection as for LiNbO, 128' [l].…”

Section: Introductionmentioning

confidence: 99%

Electroacoustic characterisation of +64 degrees and +41 degrees Y-rotated LiNbO/sub 3/ for wide bandwidth low loss filter design

Doisy¹,

Hodé²,

Desbois³

et al.

IEEE Symposium on Ultrasonics

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Low frequency material parameters for 64' and 41O-rotated Y-cut LiNbO,, can be found in the published literature, however these cannot be easily interpreted due to the non Rayleigh wave nature of acoustic propagation. In addition, to properly design high frequency low loss filter, accurate electroacoustic material parameters are required. Acoustic propagation on metallized surface high coupling coefficient 64' and 41' rotated Y-cut LiNbO, have been both experimentally and theoretically investigated. A complete set of experimentally determined acoustic parameters in the 0.85 to 1.6 GHz frequency range is presented: velocity and attenuation versus metallization thickness. 11.6 4: and 21 X coupling constant values have been deduced from transducer admittance measurement for 64' and' 41' LiNbO, respectively. These data have been applied to the design of 1 GHz Image Impedance Connected low loss filters. 7% and 10% 3 dB fractional bandwidth have been obtained with 8 and 13 dB insertion loss on 64' and 41' LiNbO, respectively.

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Design of low–loss saw filters employing distributed acoustic reflection transducers

Kodama

Kawabata

Sato

et al. 1987

Electron Comm Jpn Pt II

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As a means to reduce the loss in an SAW filter, the IDT (interdigital transducer) called the internal reflection‐type transducer has been studied extensively recently. This IDT is believed to be useful as a filter for video and broadband data transmission since it is simple in structure and has low loss over a broadband while its fabrication process and external circuit are simple. So far, the filter constructed with this IDT has had a large ripple in the passband due to a large spurious reflection. To alleviate this problem, a new distributed acoustic reflection transducer is proposed as an internal reflection type IDT in which suppression of the unwanted spurious reflection is possible over a broad frequency range. Next, the operation mechanism of this IDT is investigated and a first‐order design method is presented. It is pointed out that a low‐loss filter with an insertion loss less than 10 dB and spurious reflection suppressed by more than 45 dB can be realized with this IDT over a broad frequency range.

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High Performance SAW Filters with Several New Technologies for Cellular Radio

Cited by 34 publications

References 17 publications

Characteristics of IIDT on ZnO/diamond/Si structures

Characteristics of IIDT on ZnO/diamond/Si structures

Electroacoustic characterisation of +64 degrees and +41 degrees Y-rotated LiNbO/sub 3/ for wide bandwidth low loss filter design

Design of low–loss saw filters employing distributed acoustic reflection transducers

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