High frequency filter including both dielectric and surface acoustic wave resonators
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United States of America Patent
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Sep 15, 1998
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Oct 28, 1997
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Dec 17, 1993
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Abstract
A high-frequency filter having series and parallel electrode patterns formed on a mount substrate, surface acoustic wave resonators connected to a signal input/output line of the electrode patterns in series, and coaxial dielectric resonators having respective one input/output terminals connected to the signal input/output line and the other input/output terminals connected to a ground element. In such a composite high-frequency filter, the surface acoustic wave resonators form the resonators in the serial arms while the coaxial dielectric resonators form resonators in the parallel arms. The high-frequency filter can meet all the requirements of enhanced miniaturization, selectivity and power handling.
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