Dielectric filter having inter-resonator coupling including both magnetic and electric coupling
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United States of America Patent
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Mar 7, 1995
Issued Date -
N/A
app pub date -
Oct 12, 1993
filing date -
Apr 24, 1991
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Abstract
A small and thin plane type narrow-band dielectric filter to be used for a portable telephone and the like, includes a plurality of end short-circuited strip line resonators having a length of about quarter-wavelength formed parallel and closely to each other on a first dielectric substrate and directly magnetically coupled to each other. The thus formed strip line resonators are partially bonded to parallel plane capacitor electrodes formed on a second dielectric substrate in respective overlapping areas thereby electrically coupling the strip line resonators through the parallel plane capacitors, so that the inter-resonator coupling can be reduced due to the fact that it is achieved in combination with the magnetic coupling and the electrical coupling.
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