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US 8,508,318 B2Granted
Transmission line filter
AssigneeNEC Corporation
InventorMizuki Iwanami
Life of this patent
Estimating the term…
Abstract
A stop band or a pass band is generated in a transmission line filter by providing a plurality of dielectric bodies having a periodic structure in the length direction of the transmission line filter and causing Bragg reflection of transmission wave. A voltage is applied to some or all of the dielectric bodies and the frequency of the stop band or the pass band is changed or controlled by adjusting the voltage.
Claims15
A transmission line filter comprising:
- a plurality of ferroelectric bodies of the same shape arranged periodically in a periodical arrangement direction;
- a strip conductor connecting said plurality of ferroelectric bodies in said periodical arrangement direction;
- a plurality of paraelectric bodies having a dielectric constant lower than that of said plurality of ferroelectric bodies;
- a ground plane,
- wherein said plurality of paraelectric bodies are of the same shape and arranged in a same direction as said periodical arrangement direction of said plurality of ferroelectric bodies,
- wherein a dielectric composite layer including said plurality of ferroelectric bodies and said plurality of paraelectric bodies are layered and positioned between said strip conductor and said ground plane;
- and
- a voltage applying circuit connected to at least one of said plurality of ferroelectric bodies,
- wherein said voltage applying circuit applies a voltage to said at least one of said plurality of ferroelectric bodies to control a frequency of a stop band of said transmission line filter so that the voltage is applied in a direction in which said ground plane and said dielectric composite layer are layered.
6 more elements
A transmission line filter comprising:
- a plurality of ferroelectric bodies of the same shape arranged periodically in a periodical arrangement direction;
- a strip conductor connecting said plurality of ferroelectric bodies in said periodical arrangement direction;
- a plurality of paraelectric bodies having a dielectric constant lower than that of said plurality of ferroelectric bodies;
- a ground plane;
- a second dielectric body layered and positioned on said ground plane,
- wherein said strip conductor is further layered and formed on said second dielectric body,
- wherein each of said plurality of ferroelectric bodies has a groove engaged with said strip conductor and layered on said strip conductor and said second dielectric body with close contact therewith;
- and
- a voltage applying circuit connected to at least one of said plurality of ferroelectric bodies,
- wherein said voltage applying circuit applies a voltage to said at least one of said plurality of ferroelectric bodies to control a frequency of a stop band of said transmission line filter, and
- wherein said voltage applying circuit is connected with said at least one of said plurality of ferroelectric bodies so that the voltage is applied in a direction perpendicular to both of a direction in which said ground plane and said second dielectric body is layered and a length direction of said strip conductor.
8 more elements
A transmission line filter comprising:
- a plurality of ferroelectric bodies of the same shape arranged periodically in a periodical arrangement direction;
- a strip conductor connecting said plurality of ferroelectric bodies in said periodical arrangement direction;
- a plurality of paraelectric bodies having a dielectric constant lower than that of said plurality of ferroelectric bodies;
- and
- a ground plane,
- wherein each of said plurality of ferroelectric bodies has a hole which said strip conductor passes through to be engaged therewith,
- wherein said strip conductor is connected with said plurality of ferroelectric bodies, passing through said hole of each of said plurality of ferroelectric bodies, and
- wherein said plurality of ferroelectric bodies, which are integrated with said strip conductor passing therethrough, are each positioned on said ground plane with close contact therewith.
5 more elements
A transmission line filter comprising:
- a plurality of ferroelectric bodies of the same shape arranged periodically in a periodical arrangement direction;
- a strip conductor connecting said plurality of ferroelectric bodies in said periodical arrangement direction;
- a plurality of paraelectric bodies having a dielectric constant lower than that of said plurality of ferroelectric bodies;
- and
- a second dielectric body having a lower dielectric constant than that of said plurality of ferroelectric bodies,
- wherein said strip conductor is divided into a plurality of segments of the same shape,
- wherein said plurality of segments of said strip conductor and said plurality of ferroelectric bodies are alternately arranged in one direction and arranged in close contact with a surface of said second dielectric body,
- wherein the transmission line filter further comprises a voltage applying circuit connected to at least one of said plurality of ferroelectric bodies,
- wherein said voltage applying circuit applies a voltage to at least one of said plurality of ferroelectric bodies to control a frequency of a stop band of said transmission line filter, and
- wherein said voltage applying circuit is connected with said at least one of said plurality of ferroelectric bodies so that the voltage is applied in a direction perpendicular to both of a direction in which said ground plane and the composite of said plurality of ferroelectric bodies and said strip conductor are layered in a length direction of said strip conductor.
7 more elements
A control method of a transmission line filter, comprising:
- inputting an arbitrary transmission wave into a transmission line filter including a plurality of ferroelectric bodies arranged in a length direction of said transmission line filter;
- causing Bragg reflection on said transmission wave by using said plurality of ferroelectric bodies;
- changing a frequency of a stop band caused by said Bragg reflection by applying a predetermined voltage to at least one of said plurality of ferroelectric bodies in a direction perpendicular to a length direction of said transmission line filter;
- and
- controlling the frequency of said stop band by controlling said applied voltage.
2 more elements
Dependencies are inferred from the claim text.