Tapered transducers-design and applications

Solie, L.P.

doi:10.1109/ultsym.1998.762094

Cited by 25 publications

(6 citation statements)

References 9 publications

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“…In contrast to previous magneotoacoustic studies performed with conventional IDTs 10,12,20,22,23,31,42,49 , here we use "tapered" or "slanted" interdigital transducers (TIDTs) [52][53][54][55] to characterize SAW-SW interaction in three different magnetic thin micro-stripes in one run. Although the fingers of the TIDT are slanted, the SAW propagates dominantly parallel to the x-axis in Fig.…”

Section: Methodsmentioning

confidence: 99%

Forward volume magnetoacoustic spin wave excitation with micron-scale spatial resolution

et al. 2022

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The interaction between surface acoustic waves (SAWs) and spin waves (SWs) in a piezoelectric-magnetic thin film heterostructure yields potential for the realization of novel microwave devices and applications in magnonics. In the present work, we characterize magnetoacoustic waves in three adjacent magnetic micro-stripes made from CoFe + Ga, CoFe, and CoFe + Pt with a single pair of tapered interdigital transducers (TIDTs). The magnetic micro-stripes were deposited by focused electron beam-induced deposition and focused ion beam-induced deposition direct-writing techniques. The transmission characteristics of the TIDTs are leveraged to selectively address the individual micro-stripes. Here, the external magnetic field is continuously rotated out of the plane of the magnetic thin film and the forward volume SW geometry is probed with the external magnetic field along the film normal. Our experimental findings are well explained by an extended phenomenological model based on a modified Landau–Lifshitz–Gilbert approach that considers SWs with nonzero wave vectors. Magnetoelastic excitation of forward volume SWs is possible because of the vertical shear strain ɛ xz of the Rayleigh-type SAW.

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Section: Methodsmentioning

confidence: 99%

Forward volume magnetoacoustic spin wave excitation with micron-scale spatial resolution

et al. 2022

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“…For obtaining the frequency responses of the SAW filters with the high rectangularity, large fractional bandwidth, low passband ripples and medium insertion loss the tapered (fanshaped) SPUDTs are used [1]. But sufficiently large insertion losses of 9-10 dB limit the application of these filters.…”

Section: Introductionmentioning

confidence: 99%

Balanced wide band fan-shaped three-tranducer SAW filters with reduced insertion loss and improved frequency response

Doberstein

2014

2014 IEEE International Ultrasonics Symposium

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This paper presents the new balanced SAW filters using fan-shaped IDTs with reduced insertion loss, a fractional bandwidth of 10-24% on 128ºYX LiNbO 3 Keywords-SAW; filter; fan-shaped; IDT; low loss . The fan-shaped threetransducer structure containing one input IDT and two output IDTs with the split electrodes is used in these filters. The constructional and topological optimization of the SAW filters is provided with a computer simulation using an δ-function model. The 255, 305 MHz samples of the SAW filters have shown 3-dB bandwidth of 30-61 MHz, insertion loss of 5.5-7.5 dB, passband ripple of around 3 dB, shape factor of 1.28-1.5, stopband attenuation over 40 dB in a matched system. The samples were housed in the 5x5x1.35 mm SMD packages and could operate in balanced/unbalanced 50-Ω system.

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“…Later, in particular in the 90s, SFITs became important for wide band filters with flat passband, steep skirts, and good stopband rejection [2]- [11]. Saw and Campbell [9] as well as Solie [10] suggested to combine tapered electrode structures and single-phase unidirectional transducers (SPUDT) cells. As a consequence, reflectionless SFITs are feasible, in particular by weighting cell reflection coefficient.…”

Section: Introductionmentioning

confidence: 99%

“…SPUDT are applicable for narrow-band, low-loss filters. But now, according to [9] and [10] wide-band, low-loss filters can be realized. In the present work, such transducers are called unidirectional slanted finger interdigital transducers (USFIT).…”

Section: Introductionmentioning

confidence: 99%

SAW filters including one-focus slanted finger interdigital transducers

Martin

Steiner

2003

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

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The present paper describes a new filter type, slanted finger interdigital transducer (SFIT) that allows fast analysis as a precondition for fast optimization. Therefore, filter structure and analysis are especially suitable for optimizing unidirectional SFIT (USFIT) filters. For analysis, a SFIT filter is usually divided into many narrow channels. Every channel is considered to be a subfilter and is analyzed separately. Therefore, the total filter analysis is very time consuming. For reducing computing time, we suggest a one-focus structure. In contrast to conventional SFIT filters, not only the finger and gap widths but also the spaces between transducers of different channels differ by one and the same scaling factor. As a consequence, all prolonged finger edges of both transducers intersect in one point called focus. As a result, the parameters of all subfilters can be calculated from the parameters of only one subfilter by simple frequency scaling. Consequently, the total time for analysis is essentially reduced. However, one-focus SFIT filters with continuous finger edges show a deep minimum within the passband. This problem can be overcome by using stepped one-focus structures.

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Tapered transducers-design and applications

Cited by 25 publications

References 9 publications

Forward volume magnetoacoustic spin wave excitation with micron-scale spatial resolution

Forward volume magnetoacoustic spin wave excitation with micron-scale spatial resolution

Balanced wide band fan-shaped three-tranducer SAW filters with reduced insertion loss and improved frequency response

SAW filters including one-focus slanted finger interdigital transducers

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