Mobile terminal

• US 20050064903A1
• Filed: 07/19/2004
• Published: 03/24/2005
• Est. Priority Date: 09/19/2003
• Status: Active Grant

• Current Assignee: Maxell, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Chiba, Yutaka, Uotsu, Shinichi, Kumekawa, Masanobu
• Granted Patent: US 7,555,324 B2
• Time in Patent Office: Days
• US Class Current: 455/556.100
• CPC Class Codes: H04B 1/3805 with built-in auxiliary receivers
• CPC Class Codes: H04B 1/44 Transmit/receive switching
• CPC Class Codes: H04B 7/0814 based on current reception conditions, e.g. switching to different antenna when signal level is below threshold
• CPC Class Codes: H04M 2250/10 including a GPS signal receiver
• CPC Class Codes: H04W 52/0274 by switching on or off the equipment or parts thereof
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

In a cell phone, no consideration is given to a switch unit when a reception circuit for space diversity is added, and consequently an antenna can be optimally connected to the reception circuit for space diversity. The cell phone comprises a first antenna for radio communication, a transmission-reception circuit to exchange signals with a base station through the first antenna, and a GPS reception circuit to receive signals from the GPS satellite through the first antenna. The reception circuit receives a signal from the base station, a second antenna different from the first antenna is provided, and the switch unit changes over connections between the first antenna and the second antenna, and the transmission-reception circuit, the GPS reception circuit and the reception circuit according to operation modes.

Claims

1. A mobile terminal including a first antenna for radio communication;

a transmission-reception circuit to exchange signals with a base station through the first antenna; and

a GPS reception circuit to receive signals from GPS satellites through the first antenna, said mobile terminal comprising;

a reception circuit for receiving signals from the base station;

a second antenna different from the first antenna; and

a switch unit for changing over connections to the first antenna, the second antenna, the transmission-reception circuit, the GPS reception circuit, and the reception circuit according to a mode of operation.

2. A mobile terminal according to claim 1, further comprising an external monitor terminal and a connection detecting unit to detect that a connector is connected to the external monitor terminal, wherein when the connection detecting unit detects that the connector is connected and a specified operation is executed and, as a result, the external terminal mode become effective, the switch unit changes over the connection of the external monitor terminal to the transmission-reception circuit, the GPS reception circuit or the reception circuit according to the mode of operation.

3. A mobile terminal according to claim 1, further comprising a power supply control unit for tuning off the power supply to the reception circuit, wherein when the operation mode is voice communication, the power supply to the reception circuit is turned off by the power supply control unit.