RADIO COMMUNICATION DEVICE AND POWER SUPPLYING METHOD FOR RADIO COMMUNICATION DEVICE

• US 20080268796A1
• Filed: 04/23/2008
• Published: 10/30/2008
• Est. Priority Date: 04/27/2007
• Status: Active Grant

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Narahashi, Shoichi, Okazaki, Hiroshi, Fukuda, Atsushi
• Granted Patent: US 8,073,407 B2
• Time in Patent Office: Days
• US Class Current: 455/127.1
• CPC Class Codes: H04B 1/1607 Supply circuits converters H02M; filters therefor H02M1/14; voltage stabilisers G05F1/46

Abstract

A radio communication device in which the output transmission signal of a high-frequency power amplifying part is sent out to an antenna via a circulator, a high-frequency signal reflected from the antenna is transferred via the circulator to a rectifying part to obtain a direct current power, and the direct current power is supplied to a power amplifying part or another constituent part in the radio communication device as an aid to the power supply from a power supply unit.

Claims

1. A radio communication device, comprising:

an antenna;

a high-frequency power amplifying part that supplies a transmission signal to said antenna;

a rectifying part that converts a high-frequency signal into a direct current power;

a circulator having a first port connected to the output of said high-frequency power amplifying part, a second port connected to said antenna and a third port connected to said rectifying part, and configured such that an input from the first port is outputted to the second port, and an input from the second port is outputted to the third port; and

a power supply unit that feeds electric power at least to said high-frequency power amplifying part;

wherein a direct current power from said rectifying part is supplied to at least one of said high-frequency power amplifying part and another constituent part in said radio communication device.

2. The radio communication device according to claim 1, further comprising a phase shifter inserted between said antenna and said circulator, for adjusting the phase of a transmission signal reflected by said antenna so as not to be in reverse relation with the phase of a transmission signal leaked from the first port to the third port of said circulator.

3. The radio communication device according to claim 1, wherein multiple sets of said high-frequency power amplifying part and said circulator are provided each for different frequency bands of transmission signals, said radio communication device further comprising:

a first switch that selects one of said multiple sets and supplies a transmission signal from the second port of said circulator in the selected set to said antenna, and a second switch that supplies electric power from at least one of said power supply unit and said rectifying part to said high-frequency power amplifying part in the selected one of the sets.

4. The radio communication device according to claim 3, wherein a phase shifter is provided between said first switch and said circulator in each of said multiple sets, and is configured to adjust the phase of a transmission signal reflected by said antenna so as not to be in reveres relation with the phase of a transmission signal leaked from the first port to the third port of said circulator.

5. The radio communication device according to claim 3, wherein a variable phase shifter is provided between said antenna and said switch, and is configured to adjust the phase of a transmission signal reflected by said antenna so as not to be in reverse relation with the phase of a transmission signal leaked from the first port to the third port of the circulator in the frequency band selected by the switch.

6. The radio communication device according to claim 1, wherein multiple sets of said signal source, said high-frequency power amplifying part, said circulator, said antenna and said rectifying part are provided, said radio communication device further comprising:

a power combiner that combines outputs from said rectifying parts in the multiple sets and supplies the combined power to at least one of said high-frequency power amplifying part and said functional constituent part.

7. The radio communication device according to claim 6, wherein a phase shifter is provided between said antenna and said circulator in each of the multiple sets, and is configured to adjust the phase of a transmission signal reflected by said antenna so as not to be in reverse relation with the phase of a transmission signal leaked from the first port to the third port of said circulator.

8. The radio communication device according to claim 1, wherein multiple sets of said signal source, said high-frequency power amplifying part, said circulator and said antenna are provided, said radio communication device further comprising:

a plurality of phase shifters each connected to the third port of said circulator in corresponding one of said multiple sets, and a power combiner that combines outputs from said plurality of phase shifters and supplies a combined output to said rectifying part;

wherein carrier frequency bands of transmission signals outputted from said high-frequency power amplifying parts of said multiple sets are equal to each other; and

said phase shifters are configured to adjust the phases of transmission signals reflected by said antennas so as not to be in reverse relation with each other.

9. The radio communication device according to claim 8, wherein a second phase shifter is provided between said antenna and said circulator of each set, and is configured to adjust the phase of a transmission signal reflected by said antenna so as not to be in reverse relation with the phase of a transmission signal leaked from the first port to the third port of said circulator.

10. The radio communication device according to any one of claims 1 to 9, wherein said rectifying part comprises two or more diodes having different current capacities for which ranges of output power levels are predetermined, and said rectifying part is configured such that one of the diodes for which an electric power corresponding to input power or output power of said high-frequency power amplifying part falls in corresponding one of the ranges, is selectively made operable as a rectifier of said rectifying part.

11. An electric power feeding method of a radio communication device that comprises:

an antenna;

a high-frequency power amplifying part that supplies a transmission signal to said antenna;

a rectifying part that converts a high-frequency signal into a direct current power;

a circulator having a first port connected to the output of said high-frequency power amplifying part, a second port connected to said antenna and a third port connected to said rectifying part, and configured such that an input from the first port is outputted to the second port, and an input from the second port is outputted to the third port; and

a power supply unit that feeds electric power at least to said high-frequency power amplifying part;

wherein a direct current power from said rectifying part is supplied to at least one of said high-frequency power amplifying part and another constituent part in said radio communication device, said method comprising;

sending out a high-frequency signal from said high-frequency power amplifying part to said antenna via said circulator;

sending a high-frequency signal reflected from said antenna to said rectifying part; and

converting the reflected high-frequency signal into a direct current power.

12. The electric power feeding method of a radio communication device according to claim 11, wherein said rectifying part comprises two or more diodes of different current capacities, and said converting step comprises a step of selecting one of the diodes in said rectifying part in accordance with an input power or output power of said high-frequency power amplifying part.