Single phase undirectional surface acoustic wave transducer and improved reflectors
First Claim
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1. A surface acoustic wave (SAW) device, comprising:
- a defined area on a piezoelectric substrate within which is located an open circuit reflector perpendicular to the SAW direction of propagation; and
a pair of low reflectivity transducer electrodes located within said defined area and connected to opposing bus bars, said electrodes perpendicular to the direction of said SAW propagation and positioned with the excitation center of said pair of electrodes located about seven-eighths of a Rayleigh wavelength at a center frequency of said SAW from said reflector.
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Abstract
A unidirectional transducer for a surface acoustic wave (SAW) device. In one embodiment the device includes (1) a defined area on a piezoelectric substrate within which is located an open circuit reflector perpendicular to the SAW direction of propagation; and a pair of low reflectivity transducer electrodes located within the defined area and connected to opposing bus bars, the electrodes perpendicular to the direction of the SAW propagation and positioned with the excitation center of the pair of electrodes located about seven-eighths of a Rayleigh wavelength at a center frequency of the SAW from the reflector.
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21 Claims
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1. A surface acoustic wave (SAW) device, comprising:
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a defined area on a piezoelectric substrate within which is located an open circuit reflector perpendicular to the SAW direction of propagation; and a pair of low reflectivity transducer electrodes located within said defined area and connected to opposing bus bars, said electrodes perpendicular to the direction of said SAW propagation and positioned with the excitation center of said pair of electrodes located about seven-eighths of a Rayleigh wavelength at a center frequency of said SAW from said reflector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification