Second Order Effects in Surface Wave Devices

Jones, W.S.; Hartman, C.S.; Sturdivant, T.D.

doi:10.1109/t-su.1972.29688

Cited by 83 publications

(20 citation statements)

References 11 publications

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“…The amplitude droop is more pronounced for the narrowband devices than for the wideband devices. In [17], similar types of distortion were observed for the impulse responses of phase-coded SAW correlators fabricated using aluminum metallization on lithium niobate. The authors concluded that the major contribution to the observed distortions was acoustic mismatch at the electrode discontinuities (Le., finger reflections).…”

Section: Measurements and Comparison To Theorysupporting

confidence: 56%

“…The distinguishing difference among the measured responses is the appearance of the trailing sidelobes. Distortion of the trailing sidelobes is typical of phase-coded SAW correlators [17], [24]. As discussed previously, acoustic reflections at the metal electrode edges due to mechanicalloading and piezoelectric shorting are the major cause of this distortion.…”

mentioning

confidence: 85%

“…The deviation from theoretical varies by 1.4-3.8 dB. This is attributed mainly to acoustic mismatch (i.e., finger reflections) at the metal electrode edges [17]. The input and output transducers of a SAW device consist of interdigital metal fingers connected to common bus bars.…”

Section: Autocorrelation Response Measurementsmentioning

confidence: 99%

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A SAW-based commutation signaling modem for broadband indoor wireless communication

Kipens

Leib²,

Saw³

et al. 1998

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

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This manuscript has been reproduced trom the microfilm master. U1v.1I films the teX! directly fram the original or copy submitted. Thus, sorne thesis and dissertation copies are in typewriter face, while others may be fram any type of computer printer.The quality of this reproduction is dependent upon the quality of the copy submitted. Broken or indistinct print, colored or poor quality illustrations and photographs, print bleedthrough, substandard margins, and improper alignment can adversely affect reproduction.In the unlikely event that the author did not send U1\fi a complete manuscript and there are missing pages, these will be noted. Also, if unauthorized copyright material had to be removed, a note will indicate the deletion.Oversize materials (e.g., maps, drawings, charts) are reproduced by sectioning the original, beginning at the upper left-hand corner and continuing from left to right in equal sections with small overlaps. Each original is aIso photographed in one exposure and is included in reduced fonn at the back ofthe book.Photographs included in the original manuscript have been reproduced xerographically in this copy. Higher quality &' x 9" black and white photographic prints are available for any photographs or illustrations appearing in this copy for an additional charge. Contact UMI directly to order. The author has granted a nonexclusive licence allowing the National Library of Canada to reproduce, loan, distribute or sell copies of this thesis in microform, paper or electronic formats. UMIThe author retains ownership of the copyright in this thesis. Neither the thesis nor substantial extracts frOID it may be printed or otherwise reproduced without the author' s permISSIon.L'auteur a accordé une licence non exclusive permettant à la Bibliothèque nationale du Canada de reproduire, prêter, distribuer ou vendre des copies de cette thèse sous la forme de microfiche/film, de reproduction sur papier ou sur format électronique.L'auteur conserve la propriété du droit d'auteur qui protège cette thèse. Ni la thèse ni des extraits substantiels de celle-ci ne doivent être imprimés ou autrement reproduits sans son autorisation.Commutation signaling is a bandwidth expanding modulation scheme that is robust to multipath induced intersymbol interference. Surface Acoustic Wave (SAW) technology is very suitable for implementing high.-speed commutation signaling modems. A SAW-based commutation signaling modem for broadband indoor wireless communication is described. The differential coherent detector is a key element since it performs IF matched filtering and differentially coherent demodulation of the received signaL A commutation signaling differential coherent detector has been implemented using SAW and analog silicon technologies. The bit rate is 40 Mb/s, the chip rate is 200 Mel s and the operating frequency (IF frequency) is 1 GHz. A multicarrier commutation signaling modem uses frequency-division multiplexed subcarriers to combine a number of lower rate bit streams in order to achieve high-rate data tra...

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Section: Measurements and Comparison To Theorysupporting

confidence: 56%

mentioning

confidence: 85%

See 1 more Smart Citation

A SAW-based commutation signaling modem for broadband indoor wireless communication

Kipens

Leib²,

Saw³

et al. 1998

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

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show abstract

“…However, the stringent requirements on the time sidelobes ( = 40 dB), passband ripples ( :::= 0.1 dB) and insertion loss ( ::: 3 dB) prohibits the use of this methodology. The spurious signals [6,7] arising from Triple Transit Echo (TIE), electrode edge reflections, bulk waves, diffraction etc play a vital role in determining the response of these devices. In the present case, the methodologies adopted to minimize these effects, to improve the device performance are as follows.…”

Section: Second Order Effects In Saw Devicesmentioning

confidence: 99%

“…The requirement of low loss, large bandwidth, in the front-end receivers prognosticates the use of high coupling materials {Lithium Niobate or Lithium Tantalate). However, the performance of the devices fabricated on these materials is considerably influenced by the second order effects [6,7] such as triple transit echo, edge reflections, electrode reflections, electro-acoustic regeneration etc. These effects can be minimised, using low-coupling material (Y-X or S-T Quartz), at the cost of incurring higher insertion loss in the device.…”

mentioning

confidence: 99%

An Improved Transducer Configuration for Phase-Coded Surface Acoustic Wave Devices

Majumder¹,

Panwar²

1992

IETE Journal of Research

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Scattering of Shear Horizontal Waves by Massive Metallic Electrodes in Saw Devices

Bahgai-Wadji

1991

Physical Acoustics

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Second Order Effects in Surface Wave Devices

Cited by 83 publications

References 11 publications

A SAW-based commutation signaling modem for broadband indoor wireless communication

A SAW-based commutation signaling modem for broadband indoor wireless communication

An Improved Transducer Configuration for Phase-Coded Surface Acoustic Wave Devices

Scattering of Shear Horizontal Waves by Massive Metallic Electrodes in Saw Devices

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