CIRCUIT INTEGRATING A TUNABLE ANTENNA WITH A STANDING WAVE RATE CORRECTION

• US 20100022203A1
• Filed: 03/05/2009
• Published: 01/28/2010
• Est. Priority Date: 03/07/2008
• Status: Active Grant

• Current Assignee: Stmicroelectronics Tours SAS (STMicroelectronics NV)
• Original Assignee: Stmicroelectronics Tours SAS (STMicroelectronics NV)
• Inventors: BONNET, Benoît, DUPONT, François
• Granted Patent: US 8,412,121 B2
• Time in Patent Office: Days
• US Class Current: 455/84
• CPC Class Codes: H01Q 1/241 used in mobile communications, e.g. GSM H01Q1/247, H01Q1/248 take precedence
• CPC Class Codes: H01Q 1/36 Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewithH01Q1/08, H01Q1/14 take precedence
• CPC Class Codes: H01Q 13/103 with variable reactance for tuning the antenna tuning resonant circuits H03J
• CPC Class Codes: H01Q 9/0442 with particular tuning means
• CPC Class Codes: H01Q 9/145 by varying the electrical length

Abstract

An integrated electronic radio-frequency transceiver circuit, including: at least one terminal intended to receive a signal to be transmitted or to transmit a received signal; at least one planar antenna, with a settable resonance frequency; at least one bidirectional coupler having a primary line interposed between the terminal and the antenna and having the respective terminals of a secondary line providing data representative of the transmitted power and of the power reflected on the primary line side; at least one detector of the transmitted power and of the reflected power; and a circuit for selecting the resonance frequency of the antenna according to the ratio between the transmitted power and the reflected power.

Claims

1. An integrated electronic radio-frequency transceiver circuit, comprising:

at least one terminal intended to receive a signal to be transmitted or to transmit a received signal;

at least one planar antenna with a settable resonance frequency;

at least one bidirectional coupler having a primary line interposed between said terminal and the antenna and having the respective terminals of a secondary line providing data representative of the transmitted power and of the power reflected on the primary line side;

at least one detector of the transmitted power and of the reflected power; and

a circuit for selecting the resonance frequency of the antenna according to the ratio between the transmitted power and the reflected power.

2. The circuit of claim 1, having no impedance matching circuit.

3. The circuit of claim 1, wherein the antenna with a settable frequency comprises one or several miniature electromechanical switches interposed between conductive elements.

4. The circuit of claim 1, wherein the antenna with a variable frequency comprises one or several elements of settable capacitance.

5. A radio-frequency transceiver device, comprising the circuit of claim 1.

6. The device of claim 5, having no impedance matching circuit.