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

外国特許コード F170009054
整理番号 J1012-06WO
掲載日 2017年4月26日
出願国 アメリカ合衆国
出願番号 201515121530
公報番号 20160373160
出願日 平成27年2月25日(2015.2.25)
公報発行日 平成28年12月22日(2016.12.22)
国際出願番号 JP2015055434
国際公開番号 WO2015129757
国際出願日 平成27年2月25日(2015.2.25)
国際公開日 平成27年9月3日(2015.9.3)
優先権データ
  • 特願2014-036943 (2014.2.27) JP
  • 2015WO-JP55434 (2015.2.25) WO
発明の名称 (英語) Non-reciprocal transmission apparatus with different backward and forward propagation constants, provided for circularly polarized wave antenna apparatus
発明の概要(英語) (US20160373160)
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.
特許請求の範囲(英語) [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.
  • 発明者/出願人(英語)
  • UEDA TETSUYA
  • POROKHNYUK ANDREY
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
国際特許分類(IPC)
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