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

Kodama, T.; Kawabata, Hirokazu; Sato, H.; Yasuhara, Y.

doi:10.1002/ecjb.4420700904

Cited by 23 publications

(20 citation statements)

References 10 publications

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“…In the present analysis the reflection center is taken at the center of the reflector (center of the wide electrode of 8 / 3 0 λ width), and the transduction center is taken at the center of the space between opposite polarity electrodes. DART structures [9] have been used for implementing the reflectivity in SAW structures, where three electrodes per unit cell are used. In Fig.1 a1 and a2 (b1 and b2) are input (output) acoustic signals at port 1 and port 2 respectively.…”

Section: Three-port Reflecting Cell Modelmentioning

confidence: 99%

Reflecting Cell Model for SAW Structures

Priyanka¹,

Joshi²,

Panwar³

2010

IJCA

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The study presents three-port reflecting cell model for analyzing SAW structures employing strong electrode reflections. Basic objective is to analytically approximate all the p-matrix elements for a SAW structure in terms of reflection, transduction, and transmission strengths. This model is an approximate one and it does not take into account the effects of bulk wave excitation, diffraction, and propagation loss etc for convenience. This 3-port reflecting cell model has been used to show that it is possible to realize Infinite Impulse Response (IIR) filters on SAW devices, which can result in much smaller size as compared to very high order Finite Impulse Response (FIR) SAW filters for given specifications. Simulation results for this new 3-port reflecting cell model and IIR filter realization are presented for validation purpose.

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Section: Three-port Reflecting Cell Modelmentioning

confidence: 99%

Reflecting Cell Model for SAW Structures

Priyanka¹,

Joshi²,

Panwar³

2010

IJCA

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“…Hanma and Hunsinger [1] introduced the first type in 1976, and the main other types are the group-type [2], FEUDT [3], and the Distributed Acoustic Reflection Transducer or DART [4], which emerged in the 1980s. The DART, with differing electrode widths and exploiting mechanical loading, is now in common use, usually on quartz substrates.…”

Section: Introductionmentioning

confidence: 98%

Quasi-static analysis of floating electrode unidirectional SAW transducers

Morgan¹

2001

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

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The quasi-static theory of SAW transducers is a simplified Green's function analysis that has previously been shown to be effective for transducers in which short-circuit reflections are negligible. Here, the theory is extended to allow for floating electrodes, which occur in floating-electrode unidirectional transducers (FEUDTs). An analysis for the coupled-mode (COM) parameters of FEUDTs is developed, giving the capacitance, transduction, and reflection parameters and the locations of the transduction and reflection centers. For a FEUDT with six electrodes per period, algebraic results are obtained in terms of Legendre function expressions, giving the COM parameters as functions of metalization ratio. These results agree with earlier derivations by other authors, but they are obtained much more simply. Numerical results are straightforward to obtain. A FEUDT with five electrodes per period is also analyzed, showing that it performs similarly to the six-electrode type.

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“…The FEUDT (Floating-Electrode-Unidirectional Transducer) [1], EWC-SPUDT (Electrode-Width-Controlled Single-Phase-Unidirectional Transducer) [2], and DART (Distributed-Acoustic-Reflection Transducer) [3] are widely used as ways to reduce the loss of surface acoustic wave devices and to achieve reduction of chip area. In FEUDT, reflectors are installed inside the interdigital electrodes on the bidirectional substrate so that the center of reflection is shifted from the center of the electrode in order to obtain unidirectionality.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Finite‐Element Analysis of Surface Acoustic Waveguides with One‐Wavelength Period along Propagation Direction

Hasegawa

Koshiba

2002

Electron Comm Jpn Pt II

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SUMMARYThe finite-element analysis method based on the hybrid variational principle is proposed for analysis of the dispersion characteristic of periodic surface acoustic waveguides with a one-wavelength period. A new formulation is used for finite element approximation applied to the periodic function part of Floquet modes. This approach allows elimination of the uniform field without sinusoidal variations in the periodic direction, which has been included in the conventional hybrid finite-element analysis to directly approximate the entire field distribution. Hence, an analysis of periodic waveguide structures with a one-wavelength period is now possible. Specifically, the reflection properties are studied for a metallic grating reflector with a one-wavelength period formed on an X-112°Y LiTaO 3 substrate and for a DART and an EWC-SPUDT.

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

Cited by 23 publications

References 10 publications

Reflecting Cell Model for SAW Structures

Reflecting Cell Model for SAW Structures

Quasi-static analysis of floating electrode unidirectional SAW transducers

Hybrid Finite‐Element Analysis of Surface Acoustic Waveguides with One‐Wavelength Period along Propagation Direction

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