New unidirectional transducer and broadband reflector of acoustic surface waves

Marshall, F.G.; Paige, E.G.S.; Young, A.S.

doi:10.1049/el:19710431

Cited by 30 publications

(1 citation statement)

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“…For example, the multistrip coupler-based unidirectional transducers [3] are suitable for use on highk 2 substrate but occupy additional substrate area. Phase shifting and matching circuitry is needed in three-phase unidirectional transducers [4] and group-type unidirectional transducers [5].…”

Section: Introductionmentioning

confidence: 99%

New Low-Loss Surface Acoustic Wave Transducers in the UHF Range

Yamanouchi¹,

Chen²,

Meguro³

1987

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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Absfracf-Some new low-loss surface acoustic wave (SAW) transducers are described which can be used for UHF range applications.The characteristic of these new low-loss SAW transducers is that the electrode widths are about X0/4 (X,:SAW wavelength), so the frequency limitation of these devices is almost the same as that for the conventional uniform two-electrodeslwavelength transducers. The theoretical analysis includes the internal reflections within the transducers caused by the difference of the thickness of metal electrode film or both the difference of electromechanical coupling coefficients ( K ' ) and the mass loading effect. The fundamental equations are derived and some simple results are given.In addition, the new low-loss SAW transducers are fabricated by a self-aligned angle evaporation technique which use only one photo mask, and no mask alignment is needed in the fabrication process. Experimental results show directivities of 10-26 dB/transducer at about 500 MHz and 10 dB at about 2 GHz. A prototype SAW filter has shown a very encouraging passband characteristic with a minimum insertion loss of 2.8 dB at about 500 MHz on 128" Y-X LiNb03.

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Section: Introductionmentioning

confidence: 99%

New Low-Loss Surface Acoustic Wave Transducers in the UHF Range

Yamanouchi¹,

Chen²,

Meguro³

1987

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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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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Nanometer‐fabrication process and ghz‐range low‐loss saw filters

Yamanouchi

Lee

1993

Electron Comm Jpn Pt II

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Recently, the frequency range allocated to mobile communication has been extended to the gigahertz band (quasi‐microwave). The filters used in RF stages for this high‐frequency application require wide bandpass characteristics and must have ample attenuation outside this bandpass frequency. This paper describes the fine lithography technology necessary for fabricating surface acoustic wave devices used at the gigahertz band and also a low insertion loss surface acoustic‐wave (SAW) filter.

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New unidirectional transducer and broadband reflector of acoustic surface waves

Cited by 30 publications

References 0 publications

New Low-Loss Surface Acoustic Wave Transducers in the UHF Range

New Low-Loss Surface Acoustic Wave Transducers in the UHF Range

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

Nanometer‐fabrication process and ghz‐range low‐loss saw filters

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