Antenna device and signal reception method

Patent metadata

Field	Value
Publication number	US-10523481-B1
Application number	US-201916289407-A
Country	US
Kind code	B1
Filing date	Feb 28, 2019
Priority date	Jun 20, 2018
Publication date	Dec 31, 2019
Grant date	Dec 31, 2019

Abstract

According to one embodiment, an antenna device includes an antenna, a first circuit, a second circuit and a control processing circuit. The antenna receives a radio wave signal and separates the radio wave signal into a right-hand circularly polarized wave signal and a left-hand circularly polarized wave signal. The first circuit divides the right-hand circularly polarized wave signal into a first right-hand circularly polarized wave signal and a second right-hand circularly polarized wave signal. The second circuit divides the left-hand circularly polarized wave signal into a first left-hand circularly polarized wave signal and a second left-hand circularly polarized wave signal. The control processing circuit detects a phase difference between the first right-hand circularly polarized wave signal and the first left-hand circularly polarized wave signal.

First claim

The invention claimed is:

1. An antenna device comprising:
an antenna configured to receive a radio wave signal and separate the radio wave signal into a right-hand circularly polarized wave signal and a left-hand circularly polarized wave signal;
a first circuit configured to divide the right-hand circularly polarized wave signal into a first right-hand circularly polarized wave signal and a second right-hand circularly polarized wave signal;
a second circuit configured to divide the left-hand circularly polarized wave signal into a first left-hand circularly polarized wave signal and a second left-hand circularly polarized wave signal; and
a control processing circuit configured to detect a phase difference between the first right-hand circularly polarized wave signal and the first left-hand circularly polarized wave signal.

2. The antenna device according to claim 1 , further comprising:
a first phase shifter configured to be able to shift a phase of the second right-hand circularly polarized wave signal; and
a second phase shifter configured to be able to shift a phase of the second left-hand circularly polarized wave signal, wherein
the control processing circuit controls at least one of the first phase shifter and the second phase shifter based on the phase difference.

3. The antenna device according to claim 2 , further comprising a branch circuit configured to synthesize the second right-hand circularly polarized wave signal adjusted by the first phase shifter and the second left-hand circularly polarized wave signal adjusted by the second phase shifter and output the synthesized signal.

4. The antenna device according to claim 3 , wherein a shape of the branch circuit is substantially symmetric with respect to the antenna.

5. The antenna device according to claim 3 , wherein a sum of electrical lengths of transmission lines connecting among the antenna, the first circuit, the first phase shifter and the branch circuit is substantially equal to a sum of electrical lengths of transmission lines connecting among the antenna, the second circuit, the second phase shifter and the branch circuit.

6. The antenna device according to claim 3 , wherein a shape of transmission lines connecting among the antenna, the first circuit, the first phase shifter and the branch circuit is substantially symmetric to a shape of transmission lines connecting among the antenna, the second circuit, the second phase shifter and the branch circuit when seen from the antenna.

7. The antenna device according to claim 2 , wherein the control processing circuit fixes a phase shift amount of one of the first phase shifter and the second phase shifter to a maximum value or a minimum value of a range of phase shift amount of the one phase shifter and shifts a phase shift amount of the other phase shifter.

8. The antenna device according to claim 2 , wherein insertion loss of the first phase shifter is substantially equal to insertion loss of the second phase shifter.

9. The antenna device according to claim 2 , wherein the first phase shifter has a configuration identical to the configuration of the second phase shifter.

10. The antenna device according to claim 1 , wherein the control processing circuit detects the phase difference using an amplitude of the first right-hand circularly polarized wave signal and an amplitude of the first left-hand circularly polarized wave signal.

11. The antenna device according to claim 1 , further comprising:
a first amplitude adjustment circuit configured to be able to adjust an amplitude of the second right-hand circularly polarized wave signal; and
a second amplitude adjustment circuit configured to be able to adjust an amplitude of the second left-hand circularly polarized wave signal, wherein
the control processing circuit controls at least one of the first amplitude adjustment circuit and the second amplitude adjustment circuit based on a difference between an amplitude of the second right-hand circularly polarized wave signal and an amplitude of the second left-hand circularly polarized wave signal.

12. The antenna device according to claim 11 , wherein the first amplitude adjustment circuit has a configuration identical to the configuration of the second amplitude adjustment circuit.

13. The antenna device according to claim 1 , further comprising:
a first phase shifter configured to be able to shift a phase of the right-hand circularly polarized wave signal; and
a second phase shifter configured to be able to shift a phase of the left-hand circularly polarized wave signal, wherein
the first circuit divides the right-hand circularly polarized wave signal adjusted by the first phase shifter into a third right-hand circularly polarized wave signal and a fourth right-hand circularly polarized wave signal,
the second circuit divides the left-hand circularly polarized wave signal adjusted by the second phase shifter into a third left-hand circularly polarized wave signal and a fourth left-hand circularly polarized wave signal, and
the control processing circuit controls at least one of the first phase shifter and the second phase shifter based on a phase difference between the third right-hand circularly polarized wave signal and the third left-hand circularly polarized wave signal.

14. The antenna device according to claim 13 , further comprising a branch circuit configured to synthesize the fourth right-hand circularly polarized wave signal and the fourth left-hand circularly polarized wave signal and output the synthesized signal.

15. The antenna device according to claim 1 , further comprising:
a first phase shifter configured to be able to shift a phase of the second right-hand circularly polarized wave signal;
a second phase shifter configured to be able to shift a phase of the second left-hand circularly polarized wave signal;
a third circuit configured to divide the second right-hand circularly polarized wave signal adjusted by the first phase shifter into a third right-hand circularly polarized wave signal and a fourth right-hand circularly polarized wave signal; and
a fourth circuit configured to divide the second left-hand circularly polarized wave signal adjusted by the second phase shifter into a third left-hand circularly polarized wave signal and a fourth left-hand circularly polarized wave signal, wherein
the control processing circuit controls at least one of the first phase shifter and the second phase shifter based on a phase difference between the first right-hand circularly polarized wave signal and the first left-hand circularly polarized wave signal, and
the control processing circuit controls at least one of the first phase shifter and the second phase shifter based on a phase difference between the third right-hand circularly polarized wave signal and the third left-hand circularly polarized wave signal.

16. The antenna device according to claim 15 , further comprising a branch circuit configured to synthesize the fourth right-hand circularly polarized wave signal and the fourth left-hand circularly polarized wave signal and output the synthesized signal.

17. The antenna device according to claim 1 , wherein a sum of an electrical length of a transmission line connecting between the antenna and the first circuit and an electrical length of a transmission line connecting between the first circuit and the control processing circuit is substantially equal to a sum of an electrical length of a transmission line connecting between the antenna and the second circuit and an electrical length of a transmission line connecting bet

Assignees

• Toshiba Kk

Inventors

• Sano Makoto

Classifications

• H03D3/02

  by detecting phase difference between two signals obtained from input signal (H03D3/28 - H03D3/32 take precedence; {muting in frequency-modulation receivers H03G3/28}; limiting arrangements H03G11/00) · CPC title

• H04B1/16 Primary

  Circuits · CPC title

• H04L27/22 Primary

  Demodulator circuits; Receiver circuits · CPC title