Patent ID: 8947317
Filing Date: 2015-02-03
Classification: H01P,H01Q,H03H

Abstract:
1. A microwave resonator including a microwave transmission line configured by cascade-connecting at least one unit cell between a first port and a second port, 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 the first port and the 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.