Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Reexamination Certificate
2007-01-18
2008-10-07
Tran, Anh Q (Department: 2819)
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
C333S185000, C333S219000
Reexamination Certificate
active
07432786
ABSTRACT:
A high frequency filter incorporates first to third resonators provided inside a layered substrate. The first and third resonators are adjacent to each other and inductively coupled to each other. The second and third resonators are also adjacent to each other and inductively coupled to each other. The first and second resonators are not adjacent to each other but are capacitively coupled to each other through a conductor layer for capacitive coupling. The conductor layer for capacitive coupling incorporates: a first portion for forming a first capacitor between itself and the first resonator; a second portion for forming a second capacitor between itself and the second resonator; and a third portion having an end connected to the first portion and the other end connected to the second portion, the ends being opposed to each other in the longitudinal direction. The width of at least part of the third portion is smaller than the width of each of the first portion and the second portion.
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Matsubara Hideya
Okada Atsunori
Toda Shinichiro
Tomaki Shigemitsu
Oliff & Berridg,e PLC
TDK Corporation
Tran Anh Q
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