Diversity apparatus using leakage transmission path

• US 7,783,264 B2
• Filed: 10/02/2006
• Issued: 08/24/2010
• Est. Priority Date: 10/05/2005
• Status: Expired due to Fees

• Current Assignee: Toshiba Tec Corporation (Toshiba Corporation)
• Original Assignee: Toshiba Tec Corporation (Toshiba Corporation)
• Inventors: Yaginuma, Jun, Oishi, Sadatoshi, Sugiyama, Tomonori
• Primary Examiner(s): Milord; Marceau
• Application Number:
  US11/541,953
• Publication Number:
  US 20070077897A1
• Time in Patent Office: 1,422 Days
• Field of Search: 455/78, 455/561, 455/82, 455/504, 455/523, 455/14, 455/88, 455/101, 333/237, 343/702, 343/770
• 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 transmitting a carrier wave having power;

a phase shifter including

a power divider which distributes the power; and

a switch which switches distributed powers from the power divider to output any one of the distributed powers,

the phase shifter switching phases of the carrier wave transmitted from the transceiver; and

a single 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 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.

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

5. The diversity apparatus according to claim 2, wherein the power divider includes a hybrid coupler which distributes an input power in half.

6. 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.

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

8. The diversity apparatus according to claim 1, wherein the power divider includes a hybrid coupler which distributes an input power in half.