Resonator, filter, duplexer, and communication device
First Claim
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1. A resonator comprising:
- a substrate; and
a set of lines comprising a plurality of spiral lines;
wherein inner and outer ends of the spiral lines are distributed substantially along an inner periphery and an outer periphery of the set of lines respectively, the inner and outer peripheries being centered around a specified point on the substrate, wherein the lines do not cross each other and wherein the width of at least one of the lines is substantially equal to or narrower than the skin depth of a conductor material of the line at a resonant frequency of the resonator.
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Abstract
A resonator can provide good loss characteristics by effectively suppressing power losses due to an edge effect. In addition, a filter, a duplexer, and a communication device incorporating the resonator are formed. In the resonator, a plurality of spiral lines are disposed on a surface of a dielectric substrate in such a manner that the inner and outer ends of the lines are aligned respectively along an inner periphery and an outer periphery which are centered around a central point on the substrate so that the lines do not cross each other. With this arrangement, the edge effect in the spiral lines is substantially canceled, by which power losses due to the edge effect can be effectively suppressed.
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Citations
18 Claims
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1. A resonator comprising:
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a substrate; and
a set of lines comprising a plurality of spiral lines;
wherein inner and outer ends of the spiral lines are distributed substantially along an inner periphery and an outer periphery of the set of lines respectively, the inner and outer peripheries being centered around a specified point on the substrate, wherein the lines do not cross each other and wherein the width of at least one of the lines is substantially equal to or narrower than the skin depth of a conductor material of the line at a resonant frequency of the resonator. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
a transmitting circuit;
a receiving circuit; and
the duplexer in accordance with claim 16;
said transmitting circuit being connected to said transmitting terminal; and
said receiving circuit being connected to said receiving terminal.
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18. A communication device comprising:
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a transmitting circuit;
a receiving circuit; and
the filter in accordance with claim 15;
wherein at least one of said signal input and output said conductors is connected to at least one of said transmitting circuit and said receiving circuit.
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2. A resonator comprising:
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a substrate; and
a set of lines comprising a plurality of spiral lines;
wherein the spiral lines are disposed in rotation-symmetrical positions around a specified point on the substrate, wherein the spiral lines do not cross each other, and wherein the width of at least one of the lines is substantially equal to or narrower than the skin depth of a conductor material of the line at a resonant frequency of the resonator.
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3. A resonator comprising:
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a substrate; and
a set of lines comprising a plurality of lines formed thereon, each line being indicated by a monotonically increasing or decreasing line in a polar-coordinate expression with one axis representing angles and the other axis representing radius vectors;
wherein each line is arranged on the substrate in such a manner that a width of the line is within an angular width equal to or less than a value obtained by dividing 2π
radians by the number of the lines, and the width of the overall set of the lines is constantly within an angular width of 2π
radians or less at any arbitrary radius vector.
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Specification