RADIO WAVE RECEIVING APPARATUS

• US 20120129477A1
• Filed: 01/27/2012
• Published: 05/24/2012
• Est. Priority Date: 06/24/2008
• Status: Active Grant

• Current Assignee: Casio Computer Company Limited
• Original Assignee: Casio Computer Company Limited
• Inventors: SOMEYA, Kaoru
• Granted Patent: US 8,229,380 B2
• Time in Patent Office: Days
• US Class Current: 455/193.1
• CPC Class Codes: H03J 1/0008 using a central processing unit, e.g. a microprocessor digital tuning in general H03J5/0245
• CPC Class Codes: H03J 2200/06 Tuning of antenna
• CPC Class Codes: H03J 2200/10 Tuning of a resonator by means of digitally controlled capacitor bank
• CPC Class Codes: H03J 7/02 Automatic frequency control H03J7/18 takes precedence

Abstract

A radio wave receiving apparatus includes: an antenna to receive a radio wave; a tuning member to allow a reception frequency of the antenna to be tuned to an intended frequency, in which tuning member a frequency characteristic is variable; a receiving member to receive a reception signal from the antenna to demodulate a modulation wave; a positive feedback member to perform a positive feedback in a signal path including the tuning member; and a switching member to turn on/off a feedback operation of the positive feedback member.

Claims

1. A radio wave receiving apparatus including:

an antenna to receive a radio wave;

a frequency adjusting member to adjust a frequency characteristic of the antenna;

a receiving member to receive a reception signal from the antenna to extract an information signal;

a feedback member to feed back, for oscillation, the reception signal output from the antenna;

a radiating antenna to radiate the reception signal fed back by the feedback member as a radio wave; and

a switching member to switch the feedback member between an operating status and a non-operating status,

wherein the antenna and the radiating antenna are coupled together in phase.

2. The radio wave receiving apparatus according to claim 1, wherein the frequency adjusting member is adapted to adjust an oscillation frequency of the antenna.

3. The radio wave receiving apparatus according to claim 2, wherein the frequency adjusting member is adapted to adjust an impedance of the antenna.

4. The radio wave receiving apparatus according to claim 1, wherein the feedback member includes an amplifier to amplify a signal to be fed back.

5. The radio wave receiving apparatus according to claim 1, wherein the feedback member includes a phase shifting member to shift a phase of a signal to be fed back.

6. The radio wave receiving apparatus according to claim 1, wherein the feedback member is connected so as to receive the reception signal which has been output from the antenna and has not been frequency-converted to feed back the reception signal.

7. The radio wave receiving apparatus according to claim 1, wherein the radiating antenna has a configuration in which a conductor is formed in pattern on a chip.

8. The radio wave receiving apparatus according to claim 1, further comprising:

a control member capable of switching a characteristic of the frequency adjusting member,

wherein the control member switches the characteristic of the frequency adjusting member while the feedback member is in the operating status so that loop oscillation occurs in a path composed of the antenna, the feedback member and the radiating antenna, and compares reception levels in the receiving member to perform correction processing of the frequency adjusting member.