Diversity apparatus using leakage transmission path

• US 20070077897A1
• Filed: 10/02/2006
• Published: 04/05/2007
• Est. Priority Date: 10/05/2005
• Status: Active Grant

• Current Assignee: Toshiba Tec Corporation (Toshiba Corporation)
• Original Assignee: Toshiba Tec Corporation (Toshiba Corporation)
• Inventors: Oishi, Sadatoshi, Sugiyama, Tomonori, Yaginuma, Jun
• Granted Patent: US 7,783,264 B2
• Time in Patent Office: Days
• US Class Current: 455/78
• CPC Class Codes: H01P 1/184 Strip line phase-shifters H01P1/181, H01P1/185, H01P1/19 take precedence

Abstract

A diversity apparatus includes a transceiver, a phase shifter which switches phases of a carrier wave transmitted from the transceiver, and a leakage transmission path which transmits the carrier wave output from the phase shifter. The transceiver switches a phase of the phase shifter depending on a receiving level.

Claims

1. A diversity apparatus using a leakage transmission path comprising:

a transceiver;

a phase shifter which switches phases of a carrier wave transmitted from the transceiver; and

a leakage transmission path which transmits the carrier wave output from the phase shifter,

wherein the transceiver controls the phase shifter such that a phase of the phase shifter is switched depending on a receiving level.

2. The diversity apparatus according to claim 1, wherein the phase shifter switches a phase by 90°

.

3. The diversity apparatus according to claim 1, wherein the phase shifter includes:

a first transmission line;

a second transmission line having a line length different from that of the first transmission line; and

a switch which switches a transmission line through which the carrier wave transmitted from the transceiver is output to the first transmission line or the second transmission line.

4. The diversity apparatus according to claim 2, wherein the phase shifter includes:

a first transmission line;

a second transmission line having a line length different from that of the first transmission line; and

a switch which switches a transmission line through which the carrier wave transmitted from the transceiver is output to the first transmission line or the second transmission line.

5. The diversity apparatus according to claim 3, wherein the first transmission line and the second transmission line includes circuits obtained by combining a plurality of series resistors R and a plurality of parallel capacitors C.

6. The diversity apparatus according to claim 4, wherein the first transmission line and the second transmission line includes circuits obtained by combining a plurality of series resistors R and a plurality of parallel capacitors C.

7. The diversity apparatus according to claim 1, wherein the phase shifter includes:

a power divider which distributes an input power; and

a switch which switches distributed outputs from the power divider to output any one of the distributed output.

8. The diversity apparatus according to claim 2, wherein the phase shifter includes:

a power divider which distributes an input power; and

a switch which switches distributed outputs from the power divider to output any one of the distributed output.

9. The diversity apparatus according to claim 7, wherein the power divider includes a hybrid coupler which distributes an input power in half.

10. The diversity apparatus according to claim 8, wherein the power divider includes a hybrid coupler which distributes an input power in half.