PHASE SHIFTER

• US 20110304409A1
• Filed: 02/04/2011
• Published: 12/15/2011
• Est. Priority Date: 06/09/2010
• Status: Abandoned Application

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: TAMURA, Koichi
• Application Number:
  US13/021,116
• Publication Number:
  US 20110304409A1
• Time in Patent Office: Days
• US Class Current: 333/139
• CPC Class Codes: H01P 1/18 Phase-shifters H01P1/165 takes precedence
• CPC Class Codes: H03H 11/20 Two-port phase shifters providing an adjustable phase shift
• CPC Class Codes: H03H 7/20 Two-port phase shifters providing an adjustable phase shift

Abstract

According to one embodiment, a phase shifter includes an input terminal; an output terminal; a first signal path; a second signal path; and a switching circuit for selectively connecting one of the first signal path and the second signal path to the input terminal and the output terminal. The first signal path includes a high-pass filter constituting a main path and a low-pass filter secondarily added in parallel to the high-pass filter and constituting a subsidiary path. The low-pass filter compensates for insertion loss caused by the high-pass filter in a frequency range in which a transmission phase difference is given to an RF signal passing through the high-pass filter.

Claims

1. A phase shifter comprising:

an input terminal;

an output terminal;

a first signal path;

a second signal path; and

a switching circuit for selectively connecting one of the first signal path and the second signal path to the input terminal and the output terminal, wherein

the first signal path includes

a first high-pass filter constituting a main path and

a first low-pass filter secondarily added in parallel to the first high-pass filter and constituting an subsidiary path, and

the first low-pass filter compensates for insertion loss caused by the first high-pass filter in a frequency range in which a transmission phase difference is given to an RF signal passing through the first high-pass filter.

2. The phase shifter according to claim 1, wherein the second signal path includes a second low-pass filter.

3. The phase shifter according to claim 1, wherein the second signal path includes a second low-pass filter constituting a main path, and a second high-pass filter secondarily added in parallel to the second low-pass filter and constituting an subsidiary path.

4. The phase shifter according to claim 1, wherein the first high-pass filter is a T-type C-L-C (capacitor-inductor-capacitor) circuit, and the first low-pass filter is a II-type C-L-C (capacitor-inductor-capacitor) circuit.

5. The phase shifter according to claim 1, wherein the first high-pass filter is a II-type L-C-L (inductor-capacitor-inductor) circuit, and the first low-pass filter is a T-type L-C-L (inductor-capacitor-inductor) circuit.

6. The phase shifter according to claim 3, wherein the second low-pass filter is a II-type C-L-C circuit, and the second high-pass filter is a T-type C-L-C circuit.

7. The phase shifter according to claim 3, wherein the second low-pass filter is a T-type C-L-C circuit, and the second high-pass filter is a II-type C-L-C circuit.

8. The phase shifter according to claim 1, wherein the second signal path is a microstrip line.

9. The phase shifter according to claim 1, wherein the switching circuit constitutes a DPDT (double pole double throw) switch.

10. A phase shifter comprising:

an input terminal;

an output terminal;

a first signal path;

a second signal path; and

a switching circuit for selectively connecting one of the first signal path and the second signal path to the input terminal and the output terminal, wherein

the second signal path includes

a first low-pass filter constituting a main path and

a first high-pass filter secondarily added in parallel to the first low-pass filter and constituting an subsidiary path, and

the first high-pass filter compensates for insertion loss caused by the first low-pass filter in a frequency range in which a transmission phase difference is given to an RF signal passing through the first low-pass filter.

11. The phase shifter according to claim 10, wherein the first signal path is a microstrip line.