INFORMATION TERMINAL DEVICE

• US 20090052360A1
• Filed: 11/10/2008
• Published: 02/26/2009
• Est. Priority Date: 05/30/2006
• Status: Abandoned Application

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: MANDAI, Harufumi, KATO, Noboru, KIMURA, Ikuhei
• Application Number:
  US12/267,666
• Publication Number:
  US 20090052360A1
• Time in Patent Office: Days
• US Class Current: 370/310
• CPC Class Codes: H01Q 1/2275 associated to expansion card or bus, e.g. in PCMCIA, PC cards, Wireless USB
• CPC Class Codes: H01Q 21/30 Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
• CPC Class Codes: H01Q 7/00 Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
• CPC Class Codes: H04B 1/0458 Arrangements for matching and coupling between power amplifier and antenna or between amplifying stages matching circuits in general H03H
• 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 1/38 Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving

Abstract

An information terminal device includes a casing, a wireless board, and an antenna arranged to utilize a plurality of radio systems. The antenna includes a power feeding terminal and a plurality of resonant circuits. The plurality of resonant circuits are arranged to radiate radio waves. The plurality of resonant circuits further define a matching circuit that provides impedance matching between an impedance on a power feeding side as viewed from the power feeding terminal and a radiation impedance of a free space.

Claims

1. An information terminal device for supporting a plurality of radio systems, comprising:

a casing;

a wireless board; and

an antenna including a power feeding terminal and a plurality of resonant circuits, the plurality of resonant circuits being arranged to radiate radio waves;

wherein

the plurality of resonant circuits further define a matching circuit arranged to provide impedance matching between an impedance on a power feeding side as viewed from the power feeding terminal and a radiation impedance of a free space.

2. The information terminal device according to claim 1, wherein the plurality of resonant circuits include a plurality of inductance elements and a plurality of capacitance elements, and at least one of the plurality of inductance elements is arranged to radiate radio waves.

3. The information terminal device according to claim 1, further comprising:

an extension slot electrically connected to the antenna;

wherein

a wireless communication card is mounted in the extension slot, and wireless communication is performed using the antenna.

4. The information terminal device according to claim 1, wherein the wireless board includes RF circuit units provided for a plurality of different radio systems.

5. The information terminal device according to claim 3, wherein the wireless communication card utilizes one of the RF circuit units for a radio system corresponding to the wireless board.

6. The information terminal device according to claim 3, wherein the radio system corresponding to the wireless communication card is different from a radio system corresponding to the wireless board.