Radio-frequency filter, in particular in the form of a duplex filter
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United States of America Patent
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Issued Date -
Dec 9, 2004
app pub date -
Jan 9, 2004
filing date -
Jun 5, 2003
priority date (Note) -
Abandoned
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Abstract
An improved radio-frequency filter is distinguished by the following features: the resonators (9, 19) are coupled to the continuous line (3) through a dielectric, preferably in the form of the board or of the substrate (1), at least a portion of the resonators (9, 19) is arranged such that, when viewed at right angles to the board or to the substrate (1), at least a portion of the resonator (9, 19) overlaps the continuous line (3), and in the area or section in which the continuous line (3) overlaps at least one section or one portion of the resonators (9, 19), the continuous line (3) has a line constriction (5a) or a broadened line area (5b), at least for one resonator (9, 19),
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