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Non-reciprocal transmission apparatus with different backward and forward propagation constants, provided for circularly polarized wave antenna apparatus

Foreign code F170009054
File No. J1012-06WO
Posted date Apr 26, 2017
Country United States of America
Application number 201515121530
Gazette No. 20160373160
Gazette No. 10014903
Date of filing Feb 25, 2015
Gazette Date Dec 22, 2016
Gazette Date Jul 3, 2018
International application number JP2015055434
International publication number WO2015129757
Date of international filing Feb 25, 2015
Date of international publication Sep 3, 2015
Priority data
  • P2014-036943 (Feb 27, 2014) JP
  • 2015WO-JP55434 (Feb 25, 2015) WO
Title Non-reciprocal transmission apparatus with different backward and forward propagation constants, provided for circularly polarized wave antenna apparatus
Abstract (US10014903)
In a circularly polarized wave antenna apparatus including a non-reciprocal transmission line apparatus having forward and backward propagation constants different from each other, the non-reciprocal transmission line apparatus includes a transmission line part for a microwave, a series branch circuit equivalently including a capacitive element, and a shunt branch circuit branched from the transmission line part and equivalently includes an inductive element.
The non-reciprocal transmission line apparatus is formed in a nonlinear shape and magnetized in a magnetization direction different from a propagation direction of the microwave.
The non-reciprocal transmission line apparatus includes first and second reflectors provided at both ends of the non-reciprocal transmission line apparatus, respectively, and reflecting a signal; and satisfies that a phase difference between each pair of line parts located at positions opposed to each other across a substantially central part of the non-reciprocal transmission line apparatus is substantially 180 degrees.
Scope of claims [claim1]

1-9. (canceled)
[claim2]
10. A non-reciprocal transmission line apparatus having forward and backward propagation constants different from each other, wherein the non-reciprocal 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 including a transmission line part for a microwave, a series branch circuit equivalently including a capacitive element, and a shunt branch circuit branched from the transmission line part and equivalently including an inductive element,
wherein each of the at least one unit cell is disposed in a nonlinear shape,
wherein each of the at least one unit cell has a transmission line part having spontaneous magnetization or magnetized by an external magnetic field so as to have gyrotrophy by being magnetized in a magnetization direction different from a propagation direction of the microwave,
wherein the non-reciprocal transmission line apparatus is configured such that dispersion curves of a right-handed mode and a left-handed mode intersect each other, the right-handed mode and the left-handed mode being in an opposite directional relation to each other in a direction of transmitted power transmitted along the non-reciprocal transmission line apparatus, and the microwave propagates utilizing as an operating frequency a frequency band within a band gap occurring as a result of coupling, or a frequency around a frequency at an intersection of the two dispersion curves where no band gap appears, and
wherein the non-reciprocal transmission line apparatus comprises first and second reflectors connected to both ends of the non-reciprocal transmission line apparatus, respectively, and the first and second reflectors reflect an input signal.
[claim3]
11. The non-reciprocal transmission line apparatus as claimed in claim 10, wherein the non-reciprocal transmission line apparatus configures a pseudo-travelling wave resonator, and
wherein the pseudo-travelling wave resonator includes:
a first line part causing a current to flow in a predetermined first direction and radiating an electromagnetic wave polarized in the first direction, and
a second line part causing a current to flow in a second direction, which is a vertical direction substantially orthogonal to the current flowing through the first line part, and radiating an electromagnetic wave which is polarized in the second direction, and moreover, a phase of which is advanced or delayed by 90 degrees from a phase of the electromagnetic wave of the first line part.
[claim4]
12. The non-reciprocal transmission line apparatus as claimed in claim 10, wherein each of the unit cells is disposed in a single-turn ring shape having a circular, elliptical, square or rectangular shape, a spiral shape with a plurality of turns, or an L-shape.
[claim5]
13. The circularly polarized wave antenna apparatus as claimed in claim 10, wherein the circularly polarized wave antenna apparatus radiates an electromagnetic wave of right-hand circular polarization or left-hand circular polarization by switching over the magnetization direction to opposite directions.
[claim6]
14. The circularly polarized wave antenna apparatus as claimed in claim 10, wherein the phase gradient is adjusted by changing at least one of a number of unit cells, magnitude of the magnetization, and an electrical length of the shunt branch circuit.
[claim7]
15. The circularly polarized wave antenna apparatus as claimed in claim 10, wherein the first and second reflectors satisfy one of the following setting conditions:
(1) a first setting condition where an impedance thereof is 0, or the impedance has a value equal to or smaller than a predetermined value;
(2) a second setting condition where an admittance thereof is 0, or the admittance has a value equal to or smaller than a predetermined value; and
(3) a third setting condition that the first and the second reflectors have reactance elements in a complex conjugate relation.
  • Inventor, and Inventor/Applicant
  • UEDA TETSUYA
  • POROKHNYUK ANDREY
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
IPC(International Patent Classification)
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