112°-LiTaO/sub 3/ periodic waveguides

Hartmann, C.S.; Plessky, V.P.; Jen, Shen

doi:10.1109/ultsym.1995.495541

Cited by 6 publications

(4 citation statements)

References 5 publications

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“…Hartmann et al reported the same phenomenon at a one-port resonator on X-112Y LiTaO 3 . 5) They called these leaks 'side-radiation' and observed the distribution of side radiation by direct laser probe measurement.The effects of an unguided 'side-radiation' observed in our calculation and measurement results in ref 5. are caused by frequency dispersion caused by internal reflection.…”

mentioning

confidence: 47%

“…The effects of an unguided 'side-radiation' observed in our calculation and measurement results in ref. 5 are caused by frequency dispersion caused by internal reflection. When the phase velocity of the periodic structure becomes higher than that of the busbar near the upper stopband edge, waves propagating on the periodic structure leak to the busbar.…”

Section: Comparison With Previous Analysismentioning

confidence: 99%

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Two-Dimensional Coupling-of-Modes Analysis in Surface Acoustic Wave Device Performed by COMSOL Multiphysics

Tokuda

Hirota

2011

Jpn. J. Appl. Phys.

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Practical two-dimensional (2D) simulation is required in the analysis of surface acoustic wave (SAW) responses and in the design of SAW devices. As one of the 2D simulation methods, 2D coupling-of-modes (2D-COM) equations were adopted to analyze SAW behaviors on a surface plane. However, the method solving equations analytically lacks versatility and simplicity. In this paper, we propose a method that solves equations numerically by a finite element method (FEM) to realize high versatility. To verify the validity of this method, we carried out a 2D analysis for a two-port resonator by this method. An analysis model can be built simply by using a commercial FEM tool that can solve arbitrary equations. The simulation result obtained by this method is in good agreement with previous analytical and measured ones.

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mentioning

confidence: 47%

Section: Comparison With Previous Analysismentioning

confidence: 99%

Two-Dimensional Coupling-of-Modes Analysis in Surface Acoustic Wave Device Performed by COMSOL Multiphysics

Tokuda

Hirota

2011

Jpn. J. Appl. Phys.

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“…Clinton consulted TI to support development of compressive receivers and pulse compression radars using slanted IDTs [46][47][48]. He also consulted ASCOM Microsystems (later Advanced SAW Products, or ASP, and then Micronas) for development of radio frequency (RF) SAW devices for communications [54][55][58][59][60][61][62][63][64][65][66][67][68][69][70][71][72][73]. Some stories in this period are given in the next section.…”

Section: IImentioning

confidence: 99%

Clinton Sylvester Hartmann: His achievements and our unwritten stories

Hashimoto

2013

2013 IEEE International Ultrasonics Symposium (IUS)

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A brilliant super-star in the SAW community, Clinton Sylvester Hartmann passed away in Dallas, TX, on February 4, 2013, at the age of 68. This article reviews Clinton's professional career and achievements at first, and then a few stories between Clinton and me are given. The stories tell how deeply Clinton contributed to my career up and early achievements. They also show how Clinton motivated, trained, and directed one young engineer.

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“…The waveguides were found to become leaky in the same frequency range. That is a consequence of the special velocity dispersion within the grating stopband as described in [8]. Therefore we assume the said sidelobes to be connected with this effect.…”

Section: Resultsmentioning

confidence: 99%

Two-channel cascading of transversely coupled resonator filters

Martin

Schmidt

Wall³

IEEE Symposium on Ultrasonics, 2003

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Transversely Coupled Resonator Filters (TCRF) usually form a cascade of two single filters accompanied by additional loss. As known, this loss can be compensated by so-called coupling coils. However, those coils give rise to additional costs. The first try to diminish the cascade loss is to widen the aperture of coupling transducers at the expense of the remaining transducers. As a result the mean cascade coupling is hardly increased. As an alternative, the coupling IDTs are divided into two IDT components. Each IDT component has an input of its own and two inputs of different single filters are connected with each other forming a cascade connection. Thus the total TCRF has two cascade connections called channels. The sum of apertures of coupling IDT components is wider than that of the remaining IDTs of the respective single filter. Simulations show that the splitting of both resonances gets wider. As a result, the mean coupling is clearly increased and the cascading loss is reduced. This effect is confirmed experimentally.

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112°-LiTaO/sub 3/ periodic waveguides

Cited by 6 publications

References 5 publications

Two-Dimensional Coupling-of-Modes Analysis in Surface Acoustic Wave Device Performed by COMSOL Multiphysics

Two-Dimensional Coupling-of-Modes Analysis in Surface Acoustic Wave Device Performed by COMSOL Multiphysics

Clinton Sylvester Hartmann: His achievements and our unwritten stories

Two-channel cascading of transversely coupled resonator filters

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