MICROWAVE RESONATOR CONFIGURED BY COMPOSITE RIGHT/LEFT-HANDED META-MATERIAL AND ANTENNA APPARATUS PROVIDED WITH THE MICROWAVE RESONATOR
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Accused Products
Abstract
A reflective impedance element is connected to a port of a composite right/left-handed transmission line, and operates at a predetermined operating frequency so that an impedance when the reflective impedance element is seen from the port becomes a pure imaginary number jB. A reflective impedance component is connected to a port of the composite right/left-handed transmission line, and operates at the predetermined operating frequency so that an impedance when the reflective impedance element is seen from the port becomes −jB.
247 Citations
26 Claims
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1-13. -13. (canceled)
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14. A microwave resonator including a microwave transmission line configured by cascade-connecting at least one unit cell between first and second ports,
wherein the unit cell includes a series branch circuit equivalently including a capacitive element, a parallel branch circuit equivalently including an inductive element, and at least one transmission line part, wherein each unit cell of the microwave transmission line has such a circuit configuration that the microwave transmission line has a predetermined phase constant in a dispersion curve that indicates a relation between an operating frequency of a microwave signal inputted to the microwave transmission line and a phase constant of the microwave transmission line, wherein the microwave transmission line comprises a first port and a second port, wherein the microwave resonator comprises: -
a first reflective impedance circuit connected to the first port of the microwave transmission line, the first reflective impedance circuit configured to operate so that an impedance when the first reflective impedance circuit is seen from the first port becomes a first impedance at a predetermined operating frequency, a second reflective impedance circuit connected to the second port of the microwave transmission line, the second reflective impedance circuit configured to operate so that an impedance when the second reflective impedance circuit is seen from the second port becomes a second impedance at the predetermined operating frequency, and wherein an imaginary part of the first impedance and an imaginary part of the second impedance have signs different from each other, and a magnitude of the imaginary part of the first impedance and a magnitude of the imaginary part of the second impedance are substantially equal to each other. - View Dependent Claims (15, 16, 17)
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18. An antenna apparatus comprising a microwave resonator,
wherein the microwave resonator includes a microwave transmission line configured by cascade-connecting at least one unit cell between first and second ports, wherein the unit cell includes a series branch circuit equivalently including a capacitive element, a parallel branch circuit equivalently including an inductive element, and at least one transmission line part, wherein each unit cell of the microwave transmission line has such a circuit configuration that the microwave transmission line has a predetermined phase constant in a dispersion curve that indicates a relation between an operating frequency of a microwave signal inputted to the microwave transmission line and a phase constant of the microwave transmission line, wherein the microwave transmission line comprises a first port and a second port, wherein the microwave resonator comprises: -
a first reflective impedance circuit connected to the first port of the microwave transmission line, the first reflective impedance circuit configured to operate so that an impedance when the first reflective impedance circuit is seen from the first port becomes a first impedance at a predetermined operating frequency, a second reflective impedance circuit connected to the second port of the microwave transmission line, the second reflective impedance circuit configured to operate so that an impedance when the second reflective impedance circuit is seen from the second port becomes a second impedance at the predetermined operating frequency, wherein an imaginary part of the first impedance and an imaginary part of the second impedance have signs different from each other, and a magnitude of the imaginary part of the first impedance and a magnitude of the imaginary part of the second impedance are substantially equal to each other, and wherein the antenna apparatus further comprises a feeding circuit connected to one of the first reflective impedance circuit and the second reflective impedance circuit, the feeding circuit configured to output a microwave signal received by the microwave resonator. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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25. A band-pass filter apparatus comprising a microwave resonator,
wherein the microwave resonator includes a microwave transmission line configured by cascade-connecting at least one unit cell between first and second ports, wherein the unit cell includes a series branch circuit equivalently including a capacitive element, a parallel branch circuit equivalently including an inductive element, and at least one transmission line part, wherein each unit cell of the microwave transmission line has such a circuit configuration that the microwave transmission line has a predetermined phase constant in a dispersion curve that indicates a relation between an operating frequency of a microwave signal inputted to the microwave transmission line and a phase constant of the microwave transmission line, wherein the microwave transmission line comprises a first port and a second port, wherein the microwave resonator comprises: -
a first reflective impedance circuit connected to the first port of the microwave transmission line, the first reflective impedance circuit configured to operate so that an impedance when the first reflective impedance circuit is seen from the first port becomes a first impedance at a predetermined operating frequency, a second reflective impedance circuit connected to the second port of the microwave transmission line, the second reflective impedance circuit configured to operate so that an impedance when the second reflective impedance circuit is seen from the second port becomes a second impedance at the predetermined operating frequency, wherein an imaginary part of the first impedance and an imaginary part of the second impedance have signs different from each other, and a magnitude of the imaginary part of the first impedance and a magnitude of the imaginary part of the second impedance are substantially equal to each other, wherein the microwave transmission line is an unbalanced microwave transmission line, wherein the first reflective impedance circuit comprises a first impedance changing circuit that changes the first impedance, wherein the second reflective impedance circuit comprises a second impedance changing circuit that changes the second impedance, and wherein the band-pass filter apparatus further comprises a controller configured to control each of the first and second impedance changing circuits to change a band-pass frequency of the band-pass filter apparatus.
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26. A band-stop filter apparatus comprising a microwave resonator,
wherein the microwave resonator includes a microwave transmission line configured by cascade-connecting at least one unit cell between first and second ports, wherein the unit cell includes a series branch circuit equivalently including a capacitive element, a parallel branch circuit equivalently including an inductive element, and at least one transmission line part, wherein each unit cell of the microwave transmission line has such a circuit configuration that the microwave transmission line has a predetermined phase constant in a dispersion curve that indicates a relation between an operating frequency of a microwave signal inputted to the microwave transmission line and a phase constant of the microwave transmission line, wherein the microwave transmission line comprises a first port and a second port, wherein the microwave resonator comprises: -
a first reflective impedance circuit connected to the first port of the microwave transmission line, the first reflective impedance circuit configured to operate so that an impedance when the first reflective impedance circuit is seen from the first port becomes a first impedance at a predetermined operating frequency, a second reflective impedance circuit connected to the second port of the microwave transmission line, the second reflective impedance circuit configured to operate so that an impedance when the second reflective impedance circuit is seen from the second port becomes a second impedance at the predetermined operating frequency, wherein an imaginary part of the first impedance and an imaginary part of the second impedance have signs different from each other, and a magnitude of the imaginary part of the first impedance and a magnitude of the imaginary part of the second impedance are substantially equal to each other, wherein the microwave transmission line is an unbalanced microwave transmission line, wherein the first reflective impedance circuit comprises a first impedance changing circuit that changes the first impedance, wherein the second reflective impedance circuit comprises a second impedance changing circuit that changes the second impedance, and wherein the band-stop filter apparatus further comprises a controller configured to control each of the first and second impedance changing circuits to change a band-stop frequency of the band-stop filter apparatus.
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Specification