Method and Means for Coupling a Multiplicity of Surface Acoustic Wave Transducers to a Single Electromagnetic Wave Transmission Line.
DEPARTMENT OF THE AIR FORCE WASHINGTON D C
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The patent relates to the input transducers of a multichannel surface acoustic wave device which 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.
- Line, Surface and Bulk Acoustic Wave Devices