Frequency Responses of Surface-Acoustic-Wave Filters with Two-Track Slanted Finger Interdigital Transducers

Tung, Hsin-Yuan; Ro, Ruyen

doi:10.1143/jjap.44.4025

Cited by 2 publications

(3 citation statements)

References 16 publications

(30 reference statements)

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“…With given those COM parameters, reflection and transmission characteristics of reflection gratings and two-track SAW filters are calculated using the transmission matrix method. [5,6] Detailed information of the transmission matrix and the associated procedure for the calculation of the S-parameters of the two-track SAW filter can be found in references. [3,5,6] …”

Section: Saw Parameters Calculationmentioning

confidence: 99%

“…To overcome this problem, some researchers employed the window function to modify the reflectivity or line width distributions of reflectors to gain an improved suppression capability. [6][7][8] In this study, the Chebyshev window function, which has been widely used in the optimum design of antennas and filters, is proposed to modify the reflectivity distributions of reflectors.…”

Section: Introductionmentioning

confidence: 99%

“…The transmission matrix method is then applied to evaluate frequency responses of SAW filters. [5,6] …”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Design of IF Two-Track Surface Acoustic Wave Filters Using (100) AlN/Diamond Structures

Sung

Lee

et al. 2010

IUTAM Symposium on Recent Advances of Acoustic Waves in Solids

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Abstract. In this paper, characteristics of two-track surface acoustic wave (SAW) filters based on Cu electrode/(100) AlN/diamond structures were analyzed using the finite element method (FEM) and the transmission matrix method. To achieve optimum performance, the Chebyshev window function was used to modify the reflectivity distributions of reflectors. The SAW parameters for weighted reflectors with various electrode thicknesses and different metallization ratios are retrieved using the FEM. The transmission matrix method was then employed to calculate the scattering parameters of weighted reflectors and two-track SAW filters. Simulation results show a two-track SAW filter with low insertion loss, good shape factor, good sidelobe suppression, small group delay, and flat passband can be tailored and applicable to the code division multiple access (CDMA) system.

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Section: Saw Parameters Calculationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Design of IF Two-Track Surface Acoustic Wave Filters Using (100) AlN/Diamond Structures

Sung

Lee

et al. 2010

IUTAM Symposium on Recent Advances of Acoustic Waves in Solids

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Frequency Responses of SAW Ladder Filters with Apodized Interdigital Transducers and Width-Controlled Reflectors

Lee

Tung

et al. 2007

2007 Sixteenth IEEE International Symposium on the Applications of Ferroelectrics

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Frequency responses of surface acoustic unidirection IDT to decrease the insertion loss [8], using wave (SAW) ladder filters with apodized interdigital high frequency shunt element to improve rejection band transducers (IDTs) and width-controlled reflection [9], and utilizing the longitudianl leaky SAW to obtain gratings are investigated in this study. A novel low insertion loss and wide passband [10]. It is known transmission matrix method is employed to simulate the that the use of window functions to design apodized scattering parameters as well as the characteristic IDTs can adjust specifications of SAW bandpass filters impedance of one-port resonators, while the frequency [11] and the stopband suppression can be implemented responses of the multi-section ladder filters cascaded by employing width-controlled reflection gratings [12, from one-port resonators are constructed via the image 13]. To meet high performance requirment for ladder parameter method. Different window functions such as filters and duplxers in 3G systems, the adoption of Kaiser and Chebyshev functions are adopted to adjust the different window functins to design apodized IDTs of overlap width distributions of the IDTs and electrode one-port resonators with width-controlled reflection width variations of the gratings. Effects on the resonance gratings to broaden bandwidth and suppress spurious frequencies and spurious modes of one-port resonators responses is investigated in this study. The transmission are illustrated. Different stepwise weighting schemes are matrix method is applied to calculate the frequency applied to recalculate the width distributions of IDTs and responses of one-port rsonators. By using the image gratings for the realization of the modulated one-port parameter method, the ladder filters with different static resonators. Simulation results show that the bandwidth of capacitance ratios can be matched to both source and the ladder filter can be effectively increased using the load impedances and the correpsonding frequency apodized IDTs. By adjusting the overlap width ratios of responses will be also reported. the one-port resonators in the parallel and series arms, the sideband suppression level of the ladder filter is THEORETICAL MODELING enhanced. The results obtained in this study can be employed to design RF filters with broad bandwidth andThe scchematic of a one-port resonator with apodized good sideband suppression.IDT and width-controlled reflecting grating is shown in Fig. 1 and the corresponding block diagram for applying INTRODUCTION the transmission matrix method is plotted in Fig. 2.

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Frequency Responses of Surface-Acoustic-Wave Filters with Two-Track Slanted Finger Interdigital Transducers

Cited by 2 publications

References 16 publications

Design of IF Two-Track Surface Acoustic Wave Filters Using (100) AlN/Diamond Structures

Design of IF Two-Track Surface Acoustic Wave Filters Using (100) AlN/Diamond Structures

Frequency Responses of SAW Ladder Filters with Apodized Interdigital Transducers and Width-Controlled Reflectors

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