Diplexer
AssigneeFujikura Ltd.
InventorYusuke Uemichi
Life of this patent
Estimating the term…
Abstract
An embodiment of the present invention provides greater isolation between a port serving as a Tx port and a port serving as an Rx port in a diplexer. A diplexer (1) includes: a filter pair (11) constituted by first and second filters (12, 13) having a passband which is a first frequency band, the first and second filters being arranged next to each other; first and second directional coupler sections (21, 31), each of which is connected to a respective one of opposite sides of the filter pair (11); and a third filter (41) which is connected to a port (third port 213) of the first directional coupler section (21) on a side away from the filter pair (11), the third filter having a passband which is a second frequency band.
Claims6
A diplexer comprising:
- a filter pair constituted by (i) a first filter including a first port and a second port and (ii) a second filter including a first port and a second port, the first filter and the second filter each having a passband that is a first frequency band, the first filter and the second filter being arranged next to each other;
- a first directional coupler section including a first port and a second port arranged next to each other and a third port and a fourth port arranged next to each other, the first port of the first directional coupler section being connected to the first port of the first filter, the second port of the first directional coupler section being connected to the first port of the second filter;
- a second directional coupler section including a first port and a second port arranged next to each other and a third port and a fourth port arranged next to each other, the first port of the second directional coupler section being connected to the second port of the first filter, the second port of the second directional coupler section being connected to the second port of the second filter;
- and
- a third filter having a passband that is a second frequency band differing from the first frequency band, the third filter including a first port and a second port, the first port of the third filter being connected to the third port of the first directional coupler section.
Dependencies are inferred from the claim text.