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US 7,479,845 B2Granted
Branching filter package
AssigneeOki Electric Industry Co., Ltd.
InventorsWataru Ohashi, Hajime Shimamura, Tomokazu Komazaki, Yoshiaki Fujita
Life of this patent
Estimating the term…
Abstract
A branching filter package has a SAW filter chip housing area which houses a piezo electric base, on which a transmitting SAW filter and a receiving SAW filter having a different frequency passing band with each other, are formed, and an impedance matching circuit and a branching circuit for the transmitting SAW filter and the receiving SAW filter.
Claims16
A surface acoustic wave (SAW) duplexer comprising:
- a transmitting SAW filter having:
- a plurality of first SAW resonators connected to a ground, and
- an output portion;
- a receiving SAW filter having:
- a plurality of second SAW resonators connected to the ground, and
- an input portion, wherein a number of the second SAW resonators is larger
- than a number of the first SAW resonators;
- a single piezoelectric substrate on which the transmitting and receiving SAW filters are formed;
- a package base board on which the single piezoelectric substrate is mounted;
- an antenna terminal formed on the package base board, wherein the antenna terminal is connected to the output portion of the transmitting SAW filter and the input portion of the receiving SAW filter;
- an input terminal positioned on the package base board, the antenna terminal being electrically connected to the input portion of the receiving SAW filter through the input terminal of the package base board;
- and
- an output terminal positioned on the package base board, the antenna terminal being electrically connected to the output portion of the transmitting SAW filter through the output terminal of the package base board,
- wherein a distance between the input terminal and the output terminal of the package base board is greater than a distance between the output portion of the transmitting SAW filter and the input portion of the receiving SAW filter.
11 more elements
A surface acoustic wave duplexer, comprising:
- a transmitting SAW filter having a plurality of first SAW resonators connected to a ground;
- a receiving SAW filter having a plurality of second SAW resonators connected to the ground, wherein a number of the second SAW resonators is greater than a number of the first SAW resonators;
- a single piezoelectric substrate on which the transmitting and receiving SAW filters are formed;
- a package base board on which the single piezoelectric substrate is mounted;
- an antenna terminal formed on the package base board, wherein the antenna terminal is connected to the transmitting and receiving SAW filters;
- a plurality of sub package base boards constituting the package base board;
- and
- a plurality of ground voltage patterns formed on one of the sub package base boards, the ground voltage patterns being electrically connected to the transmitting and receiving SAW filters.
5 more elements
A surface acoustic wave duplexer, comprising:
- a transmitting SAW filter having a plurality of first SAW resonators connected to a ground;
- a receiving SAW filter having a plurality of second SAW resonators connected to the ground, wherein a number of the second SAW resonators is greater than a number of the first SAW resonators;
- a single piezoelectric substrate on which the transmitting and receiving SAW filters are formed;
- a package base board on which the single piezoelectric substrate is mounted, wherein the package base board comprises a heat radiating opening that radiates heat generated from the transmitting and receiving SAW filters;
- and
- an antenna terminal formed on the package base board, wherein the antenna terminal is connected to the transmitting and receiving SAW filters.
3 more elements
A surface acoustic wave (SAW) duplexer comprising:
- a transmitting SAW filter having a first input portion, a first output portion, a ground portion and a plurality of first SAW resonators connected to the ground portion;
- a receiving SAW filter having a second input portion, a second output portion, the ground portion and a plurality of second SAW resonators connected to the ground portion, and wherein a number of the second SAW resonators is larger than a number of the first SAW resonators;
- a single piezoelectric substrate on which the transmitting and receiving SAW filters are arranged in series in an arranging direction, wherein the single piezoelectric substrate has first and second sides which face each other in an orthogonal direction, the orthogonal direction being orthogonal to the arranging direction;
- a package base board on which the single piezoelectric substrate is mounted;
- and
- an antenna terminal formed on the package base board, wherein the antenna terminal is connected to the first output portion and the second input portion,
- wherein the first output portion of the transmitting SAW filter is positioned closer to the first side than the second side, and the second input portion of the receiving SAW filter is positioned closer to the second side than the first side.
4 more elements
Dependencies are inferred from the claim text.