Patent
Method and means for coupling a multiplicity of surface acoustic wave transducers to a single electromagnetic wave transmission line
TLDR
In this paper, the inductance value of the inductor was chosen such that minimum transducer insertion loss is achieved at the center frequency of the midband channel, subject to the constraint that the insertion losses of all the remaining channels, measured at their respective center frequencies, lie at or near the above optimum value within an acceptable prespecified margin.Abstract:
The input transducers of a multichannel surface acoustic wave device are electrically connected in a series or series-parallel circuit arrangement and are connected to a single channel electromagnetic wave transmission line through an inductor. The inductance value of the inductor is chosen such that minimum transducer insertion loss is achieved at the center frequency of the midband channel. The circuit arrangement is selected which achieves optimum coupling to the midband channel subject to the constraint that the insertion losses of all the remaining channels, measured at their respective center frequencies, lie at or near the above optimum value within an acceptable prespecified margin.read more
Citations
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Patent
Low loss wide bandwidth parallel channel acoustic filter
TL;DR: An acoustic wave filtering apparatus includes an acoustic wave propagating substrate for supporting propagation of acoustic waves and a plurality of acoustic wave filters for filtering an electrical signal as discussed by the authors, each of said plurality further comprises an input for supplying electrical input signals, an input unidirectional acoustic wave transducer for converting electrical signal energy into acoustic energy, an output unIDirectional audio wave transducers for converting acoustic signals to electrical signals, and an output for combining and delivering electrical output signals to external electrical apparatus.
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Monolithic lattice saw filter
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High power acoustic wave arrangement with N2 parallel-series connected acoustic wave devices
TL;DR: In this paper, the authors proposed a parallel-series arrangement of N 2 acoustic wave devices (A,B,S,T; where T is an integer greater than unity) with substantially the same electrical impedance and transfer characteristics at a given operating frequency, but an increased active device area.
References
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Patent
Acousto-electric filter utilizing surface wave propagation in which the center frequency is determined by a conductivity pattern resulting from an optical image
Robert Adler,Adrian J De Vries +1 more
Patent
Surface wave frequency discriminator
TL;DR: In this paper, a pair of surface wave electromechanical filters are placed upon a single substrate, and the spectral responses of the filters are offset in frequency and have a triangular profile so that by subtraction of the detected voltages at the output of these filters, an S characteristic is obtained.
Patent
Selectable frequency bandpass filter
TL;DR: In this paper, a selectable frequency bandpass filter includes a set of electrical filters with each of which is associated with a switch, and a subset of the electrical filters is connected in parallel between the input and the output of the selectable filter.
Patent
Surface wave frequency discriminators
TL;DR: In this article, a plurality of interdigitated surface wave transducers are formed on a piezoelectric substrate along a common acoustic channel and the signal from the output transducers is rectified and then filtered to separate the r.f. component from the audio signal.