Title:
分合波器、アンテナ装置およびフェージング消去方法
Document Type and Number:
Japanese Patent JP6455694
Kind Code:
B2
Abstract:
Used is a demultiplexer/multiplexer including: an input terminal, which receives input signals from respective phases of a quadrifilar helix antenna; a first phase shifter/separator/mixer, which is configured to alternately phase shift right-handed circularly polarized waves and left-handed circularly polarized waves of an input signal of phase 1 and phase 2, respectively, by 90°/-90° to produce phase-shifted waves and then combine the phase-shifted waves in an inphase combination; a second phase shifter/separator/mixer, which is configured to alternately phase shift right-handed circularly polarized waves and left-handed circularly polarized waves of an input signal of phase 3 and phase 4, respectively, by 90°/-90° to produce phase-shifted waves, and then combine the phase-shifted waves in an inphase combination; a first phase shifter/mixer, which receives the left-handed circularly polarized waves from the first phase shifter/separator/mixer and the second phase shifter/separator/mixer, and is configured to phase shift one of the left-handed circularly polarized waves by 180°/-180° to produce a phase-shifted wave, and then combine the phase-shifted wave and the other of the left-handed circularly polarized waves in an antiphase combination; a second phase shifter/mixer, which receives the right-handed circularly polarized waves from the first phase shifter/separator/mixer and the second phase shifter/separator/mixer, and is configured to phase shift one of the right-handed circularly polarized waves by 180°/-180° to produce a phase-shifted wave, and then combine the phase-shifted wave and the other of the right-handed circularly polarized waves in an antiphase combination; a variable phase shifter, which is configured to adjust an output signal from one of the first phase shifter/mixer and the second phase shifter/mixer by an amount of phase shift that is received in advance; and an output terminal, which outputs an output signal from the variable phase shifter and the other output signal that is not input to the variable phase shifter. As a result, a multipath effect on the quadrifilar helix antenna is reduced.
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Inventors:
Tatsuji Moriguchi
Application Number:
JP2017534100A
Publication Date:
January 23, 2019
Filing Date:
August 02, 2016
Export Citation:
Assignee:
NEC
International Classes:
H01Q11/08; H01P5/16
Domestic Patent References:
| JP2060307A | ||||
| JP58024248A | ||||
| JP57159138A |
Foreign References:
| WO2001001518A1 | ||||
| WO2008147465A2 | ||||
| US3906509 |
Attorney, Agent or Firm:
Kenho Ikeda
Takashi Sasaki
Takashi Sasaki