Power feed circuit comprising a synthesizing-distributing unit and a phase shifting unit configured for feeding a two point or a four point circularly polarized antenna
AssigneeHarada Industry Co., Ltd.
InventorYutaka Imamura
Life of this patent
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Abstract
A power feed circuit for a circularly polarized antenna includes a synthesizing-distributing unit and a phase shift unit. The synthesizing-distributing unit distributes input signals to two paths with the same phase and same amplitude. The phase shift unit has two phase shift circuits connected respectively between the two paths distributed by the synthesizing-distributing unit and two feed points of a circularly polarized antenna. The phase shift unit outputs signals whose phase difference is 90° to the two feed points and of the circularly polarized antenna.
Claims10
A power feed circuit for feeding power to a circularly polarized antenna, the power feed circuit comprising:
- a synthesizing-distributing unit that distributes input signals to two paths with the same phase and same amplitude;
- and
- a phase shift unit that has two phase shift circuits connected respectively between the two paths distributed by the synthesizing-distributing unit and two feed points of the circularly polarized antenna and that outputs signals whose phase difference is 90° to the two feed points of the circularly polarized antenna, wherein
- the phase shift unit is constituted by one of the phase shift circuits of the phase shift unit shifting the phase of a signal by −45°, and the other of the phase shift circuits of the phase shift unit shifting the phase of a signal by +45°.
A power feed circuit for feeding power to a four-point-feed circularly polarized antenna, the power feed circuit comprising:
- a first power feed circuit including a first synthesizing-distributing unit that distributes signals from a first input terminal to two paths, which are separate from each other, with the same phase and same amplitude, and a first phase shift unit that has two first phase shift circuits connected respectively between the two paths distributed by the first synthesizing-distributing unit and two feed points of the four feed points of the circularly polarized antenna and outputs signals whose phase difference is 90° to the two feed points of four feed points of the circularly polarized antenna;
- a second power feed circuit including a second synthesizing-distributing unit that distributes signals from a second input terminal to two paths, which are separate from each other, with the same phase and same amplitude, and a second phase shift unit that has two second phase shift circuits connected respectively between the two paths distributed by the second synthesizing-distributing unit and the remaining two feed points of the four feed points of the circularly polarized antenna and outputs signals whose phase difference is 90° to the remaining two feed points of the four feed points of the circularly polarized antenna;
- and
- a 180° synthesizing-distributing unit that distributes input signals to two paths, which are separate from each other, such that a phase difference between the signals is 180°, the two paths distributed by the 180° synthesizing-distributing unit being connected respectively to the first input terminal and the second input terminal and outputting the signals whose phase difference is 180° to the first input terminal and the second input terminal.
Dependencies are inferred from the claim text.