Circuit integrating a tunable antenna with a standing wave rate correction
AssigneeSTMicroelectronics (Tours) SAS
InventorsBenoît Bonnet, François Dupont
Life of this patent
Estimating the term…
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.
Claims4
A radio frequency transceiver circuit comprising:
- a planar antenna having a resonant frequency that is adjustable, wherein the planar antenna includes a conductive ground plane having a T-shaped slot in the conductive ground plane, and switching elements connected between opposite edges of the ground plane on a horizontal section of the T-shaped slot in the conductive ground plane, the switching elements being configured to adjust the resonance frequency of the antenna;
- a bidirectional coupler configured to couple power to and from the antenna, the bidirectional coupler including a primary line and a secondary line, the secondary line providing a first signal representative of transmitted power and a second signal representative of reflected power on the primary line;
- a first detection circuit configured to detect the first signal representative of transmitted power;
- a second detection circuit configured to detect the second signal representative of reflected power;
- and
- a control circuit configured to adjust the resonance frequency of the antenna, based on a ratio of the detected transmitted power to the detected reflected power, by controlling the switching elements of the planar antenna.
Dependencies are inferred from the claim text.