Patent ID: 9490511
Filing Date: 2016-11-08
CPC Classification: H01P,H01Q

Claim Text:
1. A nonreciprocal transmission line apparatus configured by connecting in cascade at least one unit cell, each unit cell including: (a) a microwave transmission line section; (b) a series branch circuit equivalently including a capacitance element; and (c) first and second parallel branch circuits provided branched from the transmission line section, each of the first and second parallel branch circuit equivalently including an inductive element between first and second ports, wherein a propagation constant in a forward direction and a propagation constant in a backward direction of the nonreciprocal transmission line apparatus are different from each other, wherein the transmission line section of each unit cell has spontaneous magnetization so as to have gyro anisotropy by being magnetized in a direction different from a propagation direction of microwaves or by being externally magnetized by an external magnetic field, wherein the first parallel branch circuit is a first stub conductor having a first electrical length, wherein the second parallel branch circuit is a second stub conductor having a second electrical length shorter than the first electrical length, and wherein, when a phase constant in a first mode of propagation in the forward direction is β