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Author

Manfred B. Schulz

Bio: Manfred B. Schulz is an academic researcher from Raytheon. The author has contributed to research in topics: Surface wave & Surface acoustic wave. The author has an hindex of 5, co-authored 6 publications receiving 160 citations.

Papers
More filters
Journal ArticleDOI
R.H. Tancrell1, Manfred B. Schulz1, Harrison H. Barrett1, L. Davis1, Melvin G. Holland1 
01 Jun 1969
TL;DR: In this paper, a model has been devised which accurately predicts the phase and amplitude characteristics of the interdigital electrode arrays with variable element spacings on LiNbO 3, which operate at 60 MHz with low insertion loss and a 3dB bandwidth over 25 percent.
Abstract: Surface ultrasonic wave delay lines with dispersive time-frequency characteristics have been made using interdigital electrode arrays with variable element spacings on LiNbO 3 . The devices operate at 60 MHz with low insertion loss and a 3-dB bandwidth over 25 percent. A model has been devised which accurately predicts the phase and amplitude characteristics of the devices. "Weighting" the array to improve the phase characteristic is described.

52 citations

Patent
01 Oct 1971
TL;DR: In this paper, a temperature compensated acoustic surface wave delay line is provided by the deposition of an interdigital electrode structure on a substrate with an overlay film surface of piezoelectric material of a predetermined thickness.
Abstract: A temperature compensated acoustic surface wave device, such as a surface wave delay line is provided in which temperature compensation is provided by the deposition of an interdigital electrode structure on a substrate with an overlay film surface of piezoelectric material of a predetermined thickness. A double substrate arrangement is also disclosed in which the interdigital electrode structure is deposited upon the surface of a non-piezoelectric layer which in turn is placed upon the surface of a piezoelectric substrate.

43 citations

Journal ArticleDOI
TL;DR: In this paper, a 1.16 GHz, 2μsec pulse has been compressed to 18 nsec using Bragg scattering of light by an acoustic beam using an ultrasonic delay line containing a frequency ramp signal.
Abstract: Pulse compression using Bragg scattering of light by an acoustic beam has been demonstrated. An ultrasonic delay line containing a frequency ramp signal is used to scatter monochromatic diverging light. If the incident and divergence angles are properly adjusted, the scattered light is focused and rapidly traverses a slit in front of a photodetector. A 1.16‐GHz, 2‐μsec pulse has been compressed to 18 nsec. Five‐nanosecond compressed pulses should be possible with this scheme.

30 citations

Patent
02 Mar 1973
TL;DR: In this article, the phase shift is varied as a function of frequency over a broad range of frequencies by varying the shape of the conductive layer, thereby permitting a desired phase response to be achieved.
Abstract: A surface acoustic wave device in which a phase or velocity shifting electrically conductive layer is located between the receiving and transmitting transducers. In one embodiment as a filter, the phase shift may be varied as a function of frequency over a broad range of frequencies by varying the shape of the conductive layer thereby permitting a desired phase response to be achieved.

25 citations

Patent
Frank Sandy1, Manfred B. Schulz1
24 May 1976
TL;DR: In this article, the authors describe a surface acoustic wave device having substantially all of the surface wave energy produced at an input transducer coupled to the output utilization means, which is determined by the interaction of the transfer properties of each of the reflecters as well as those of the input and output transducers.
Abstract: A surface acoustic wave device having substantially all of the surface wave energy produced at an input transducer coupled to the output utilization means. Plural reflecting means upon the surface of a piezoelectric substrate reflect surface waves produced by the input transducer in plural directions. The passband characteristics of the device are determined by the interaction of the transfer properties of each of the reflecters as well as those of the input and output transducers. Devices are described having extremely low insertion loss and wide bandwidth with low sidelobes and steep passband skirts.

9 citations


Cited by
More filters
Journal ArticleDOI
01 May 1985
TL;DR: In this article, an exact formulation of the grating diffraction problem without approximations is presented, using a series of fundamental assumptions, which reduces to the various existing approximate theories in the appropriate limits.
Abstract: Diffraction characteristics of general dielectric planar (slab) gratings and surface-relief (corrugated) gratings are reviewed. Applications to laser-beam deflection, guidance, modulation, coupling, filtering, wavefront reconstruction, and distributed feedback in the fields of acoustooptics, integrated optics, holography, and spectral analysis are discussed. An exact formulation of the grating diffraction problem without approximations (rigorous coupled-wave theory developed by the authors) is presented. The method of solution is in terms of state variables and this is presented in detail. Then, using a series of fundamental assumptions, this rigorous theory is shown to reduce to the various existing approximate theories in the appropriate limits. The effects of these fundamental assumptions in the approximate theories are quantified and discussed.

989 citations

Journal ArticleDOI
R.H. Tancrell1, M.G. Holland1
01 Mar 1971
TL;DR: In this article, the authors developed models to describe delay lines and compared the predictions of these theories with several experimental filters, including band-pass filters and dispersive delay lines, in the UHF range, and the frequency response is determined by the finger spacing and overlap of the interdigital comb structures used as input and output transducers.
Abstract: Acoustic surface waves offer several advantages in the construction of delay lines and filters in the UHF range. In these devices the frequency response is determined by the finger spacing and overlap of the interdigital comb structures used as input and output transducers. Models are developed to describe these devices, and the predictions of these theories are compared with several experimental filters, including band-pass filters and dispersive delay lines.

338 citations

Journal ArticleDOI
01 Aug 1970
TL;DR: In this article, the propagation of various elastic waves at the surfaces of solids is considered, followed by descriptions of the many ways which have been demonstrated for transduction between surface elastic waves and electromagnetic waves.
Abstract: Many of the recently discovered characteristics and applications to electronics of surface elastic waves are discussed. First the propagation of various elastic waves at the surfaces of solids is considered, followed by descriptions of the many ways which have been demonstrated for transduction between surface elastic waves and electromagnetic waves. Surface-wave amplification, primarily in semiconductors, and wave guiding, focusing, and reflection are examined. The properties of these waves suit them for use in a number of applications, which are discussed, ranging from realization of electronic amplifiers, frequency and analog time-domain filters, and coding devices, to the modulation of light beams and the measurement of surface properties of solids. Many references to the recent surface-wave literature are included.

328 citations

Patent
18 Aug 1997
TL;DR: In this paper, an enhanced backscatter RF-ID tag reader system and a multiprotocol RF tag reader were presented, where a non-stationary interrogation signal was used to detect a stronger phase component from quadrature phase representations or determining phase transition edges in a phase of a received signal.
Abstract: An enhanced backscatter RF-ID tag reader system and multiprotocol RF tag reader system is provided. In a multiprotocol mode, the system emits a non-stationary interrogation signal, and decodes a phase modulated backscatter signal by detecting a stronger phase component from quadrature phase representations or determining phase transition edges in a phase of a received signal. The RF tag reader system predicts or follows the phase of the backscatter signal, thereby avoiding interference from nulls in the received signal waveform due to the non-stationary interrogation signal, relative movement or environmental effects. An acoustic RF-ID tag detection system detects the reradiated signal corresponding to respective transformation of a signal in the tag. Detection of either type of RF-ID tags therefore is possible, and the absence of any tag or absence of any valid tag also determined.

287 citations

Journal ArticleDOI
TL;DR: In this article, a coupled wave analysis for the acoustooptic interaction in an anisotropic medium is presented, and the bandwidth and angular aperture characteristics of acoustoptic devices are discussed in terms of simple phase mismatch considerations.
Abstract: Abstruct-The theory, technology, and applications of bulk-wave acoustooptic devices are reviewed. A coupled wave analysis for the acoustooptic interaction in an anisotropic medium is presented. The bandwidth and angular aperture characteristics of acoustooptic devices are discussed in terms of simple phase mismatch considerations. The present status of acoustooptic materials and transducer technology is summarized. The characteristics and applications of acoustooptic devices, including deflectors, modulators, and optical filters, are discussed.

239 citations