| 摘要 |
PROBLEM TO BE SOLVED: To make up a resonator device equipped with a resonator of a High Qo with decreased conductor loss in a capacitor portion (a capacitive region), formed in miniaturized conductor lines of a thin film on a dielectric substrate, and to provide a filter, a duplexer and a communications device. SOLUTION: In the dielectric substrate 1, a region where the end of the conductor line approximates an end of the other conductor line, constituting the same resonant ingredient as the former line in the width direction is made up as the capacitive region. Adjacent capacitive regions are set so as not to overlap each other in the width direction of the conductor line. A shielding electrode 13 is provided in a mounting substrate 11. Then, by mounting a high-frequency circuit element 100 comprising the dielectric substrate 1 and the conductor lines 2 on a mounting substrate 11, a conductive line portion other than the capacitive region of the high-frequency circuit elements 100 and the shield electrode 13 on the sides of the mounting substrate 11 is made to act as an inductive region. Consequently, the resonator device is constituted of a plurality of the resonant ingredients, forming circular shapes in the capacitive region and in the inductive region. COPYRIGHT: (C)2005,JPO&NCIPI
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