WIRELESS COMMUNICATION TERMINAL APPARATUS AND METHOD OF CONTROLLING SAME

• US 20070285255A1
• Filed: 05/14/2007
• Published: 12/13/2007
• Est. Priority Date: 06/08/2006
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Ericsson Mobile Communications Japan Incorporated (Sony Group Corp.)
• Inventors: TSUSHIMA, Takaaki, Hatakeyama, Hideaki
• Granted Patent: US 8,406,686 B2
• Time in Patent Office: Days
• US Class Current: 340/572.700
• CPC Class Codes: G06K 19/0723 the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
• CPC Class Codes: G06K 19/0726 the arrangement including a circuit for tuning the resonance frequency of an antenna on the record carrier
• CPC Class Codes: G06K 19/07767 the first and second communication means being two different antennas types, e.g. dipole and coil type, or two antennas of the same kind but operating at different frequencies
• CPC Class Codes: G06K 7/0008 General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer

Abstract

A mobile communication terminal apparatus includes a non-contact communication section configured to perform non-contact communication with an external terminal apparatus. The non-contact communication section includes a main unit having a controller configured to control communication with the external terminal apparatus and a main antenna, and a sub-unit having a sub-antenna having a coil whose number of windings is smaller than the number of windings of a coil of the main antenna and an adjuster configured to adjust a resonance frequency.

Claims

1. A mobile communication terminal apparatus comprising:

a non-contact communication section configured to perform non-contact communication with an external terminal apparatus,

wherein the non-contact communication section includes

a main unit having a controller configured to control communication with the external terminal apparatus and a main antenna, and

a sub-unit having a sub-antenna having a coil whose number of windings is smaller than the number of windings of a coil of the main antenna and an adjuster configured to adjust a resonance frequency.

2. The mobile communication terminal apparatus according to claim 1, wherein the adjuster comprises at least one adjustment capacitor, a switching element connected in series to each adjustment capacitor, and a switch controller configured to control on/off of the switching element, and

the controller controls on/off of the switching element on the basis of an on/off pattern of the switching element, the on/off pattern being determined by the amount of deviation between a measured resonance frequency of the non-contact communication section and a target resonance frequency.

3. The mobile communication terminal apparatus according to one of claims 1 and 2, wherein the coupling coefficient of the main antenna and the sub-antenna is substantially 1.

4. The wireless communication terminal apparatus according to one of claims 1 to 3, wherein the ratio of the number of windings of the coil of the main antenna to that of the sub-antenna is greater than or equal to 2 and smaller than or equal to 3.

5. A method for adjusting a resonance frequency of a non-contact communication section configured to perform non-contact communication with an external terminal apparatus, the method comprising the steps of:

measuring a resonance frequency of the non-contact communication section;

computing the amount of deviation between the measured resonance frequency and a target resonance frequency; and

adjusting the resonance frequency of the non-contact communication section on the basis of the amount of deviation.

6. The adjustment method according to claim 5, wherein, in the adjustment, an on/off pattern of a switching element is obtained from a table in which on/off patterns of the switching element are stored in such a manner as to correspond to the amount of deviation, the switching element is set on/off, and the resonance frequency is adjusted.

7. A method for adjusting a resonance frequency of a non-contact communication section configured to perform non-contact communication with an external terminal apparatus, the method comprising the steps of:

reading an on/off pattern of a switching element, the on/off pattern corresponding to the amount of deviation, from a table in which on/off patterns of the switching element are stored in such a manner as to correspond to the amount of deviation; and

setting the switching element on or off on the basis of the read on/off pattern.