Nonreciprocal transmission line apparatus having asymmetric structure of transmission line

摘要

A nonreciprocal transmission line apparatus is provided with a cascade connection of unit cells between ports. Each unit cell includes a transmission line part for a microwave signal, and shunt branch circuits equivalently including inductive elements. Each unit cells has spontaneous magnetization or is magnetized by an external magnetic field so as to have gyrotropy by being magnetized in a magnetization direction different from a propagation direction of the transmission line part. In each of the unit cells, the shunt branch circuits includes a first stub conductor formed on one side with respect to a plane composed of the propagation direction and the magnetization direction, and a second stub conductor formed on the other side with respect to the plane, and the stub conductors have different electric length from each other.

主权项

1. A nonreciprocal transmission line apparatus having forward and backward propagation constants different from each other,
wherein the nonreciprocal transmission line apparatus comprises a cascade connection of at least one unit cell between first and second ports, each of the at least one unit cell comprises a transmission line part for a microwave signal, and first and second shunt branch circuits, and each of the first and second shunt branch circuits is branched from the transmission line part and equivalently include an inductive element, wherein each of the at least one unit cell has spontaneous magnetization or is magnetized by an external magnetic field so as to have gyrotropy by being magnetized in a magnetization direction different from a propagation direction of the transmission line part, and wherein in each of the at least one unit cell, the first shunt branch circuit is formed on one side with respect to a plane composed of the propagation direction and the magnetization direction, and the second shunt branch circuit is formed on the other side with respect to the plane, and an impedance of the first shunt branch circuit seen from the transmission line part is different from an impedance of the second shunt branch circuit seen from the transmission line part.