Patent ID: 8294538
Filing Date: 2012-10-23
Classification: H01P,H01Q

Abstract:
1. A transmission line microwave apparatus including a microwave transmission line constituted by cascade-connecting at least one unit cell between first and second ports, wherein said unit cell includes a series branch circuit equivalently including a capacitive element, a shunt branch circuit equivalently including an inductive element, and at least one nonreciprocal transmission line part, wherein the nonreciprocal transmission line part is made of a material that is magnetized by one of spontaneous method and magnetization method by an external magnetic field so as to have gyrotropic characteristic by being magnetized in a magnetization direction different from a propagation direction of a microwave, and the nonreciprocal transmission line part has an asymmetric structure with respect to a plane formed by the propagation direction and the magnetization direction, and wherein each of said unit cells of the microwave transmission line has such a circuit configuration that the microwave transmission line has a predetermined propagation constant in a dispersion curve that represents a relation between an operating frequency of a microwave signal inputted to the microwave transmission line, and the propagation constant of the microwave transmission line so that a propagation constant in a forward direction and a propagation constant in a backward direction have mutually different nonreciprocal phase characteristics.