Communication apparatus

• US 20060052069A1
• Filed: 06/09/2003
• Published: 03/09/2006
• Est. Priority Date: 06/10/2002
• Status: Abandoned Application

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Sasai, Takashi, Nishimura, Koji, Kakuda, Hiroshi, Odagiri, Kazuya
• Application Number:
  US10/517,221
• Publication Number:
  US 20060052069A1
• Time in Patent Office: Days
• US Class Current: 455/127.100
• CPC Class Codes: H04B 1/18 Input circuits, e.g. for coupling to an antenna or a transmission line coupling networks between antennas or lines and receivers independent of the nature of the receiver H03H
• CPC Class Codes: H04B 1/48 in circuits for connecting transmitter and receiver to a common transmission path, e.g. by energy of transmitter H04B1/46 takes precedence
• CPC Class Codes: H04M 2250/02 including a Bluetooth interface

Abstract

A communication apparatus which performs wireless communication with other communication devices existing in the neighborhood, includes: a transmission processing element 13 for processing a transmission signal; an antenna 17 for wirelessly transmitting an output of the transmission processing element 13; and an output power regulation element 16 for attenuating the output of the transmission processing element 13 to be output from the antenna 17 when a search signal to search for other communication devices is transmitted in a predetermined state from the transmission processing element 13. With such configuration, when a signal to search for other devices existing in the neighborhood is transmitted in short range wireless communication, a communication range can be restricted using a simple structure.

Claims

1-7. -7. (canceled)

8. A communication apparatus which performs wireless communication with another communication device existing in the neighborhood, comprising:

transmission processing means for processing a transmission signal;

first and second antennas to which an output of said transmission processing means is selectively supplied, in which said second antenna is formed of a signal line terminated in an impedance on the ground and the sensitivity thereof is made lower than that of said first antenna; and

output power control means for making the output of said transmission processing means output from said first antenna or from said second antenna when a search signal to search for other communication devices is transmitted from said transmission processing means, in which said second antenna is used to transmit the output in a predetermined state and said first antenna is used in other cases than that.

9. The communication apparatus according to claim 8, wherein

when said output power control means performs control to make said second antenna perform transmission output, further a gain of a transmission amplifier provided in said transmission processing means is made lower.

10. The communication apparatus according to claim 8, wherein

said first and second antennas are also connected to reception processing means for processing a reception signal, and a signal which is received by said first and second antennas and which is selectively supplied to the reception processing means is also supplied to said reception processing means.