System and method for regulating antenna electrical length

An antenna tuning system for a mobile wireless communication device comprising:

• an antenna comprising:
• an active element having a variable electrical length responsive to control signals, an input impedance that varies in response to chances in the active element electrical length, an antenna port configured to communicate electromagnetic communication signals, and a control port connected to the active element to accept the control signals;
• a transmission line communicably connected to the antenna port;
• a transceiver communicably connected to the transmission line, and configured to receive and transmit the communication signals via the transmission line;
• a detector having an input operatively connected to the transmission line, and configured to sense signals on the transmission line responsive to changes in the antenna port impedance, the sensed signals being a reflection of the communication signals;
• a regulator circuit having an input connected to the detector and configured to supply the control signals in response to the transmission line signals;
• and
• a control line connected to the regulator circuit and the control port of the antenna, and configured to supply the control signals to the antenna.

An antenna tuning system for a mobile wireless communication device comprising:

• an antenna comprising:
• an active element having a variable electrical length responsive to control signals, an antenna port configured to communicate electromagnetic communication signals, and a control port connected to the active element to accept the control signals;
• a transmission line communicably connected to the antenna port;
• a transceiver communicably connected to the transmission line, and configured to receive and transmit the communication signals via the transmission line;
• a detector having an input operatively connected to the transmission line, and configured to sense signals on the transmission line, the sensed signals being a reflection of the communication signals;
• a coupler having an input connected to the transmission line and an output connected to the detector input, the detector configured to convert signals from the coupler to a DC voltage, and to supply the DC voltage as the detected signal;
• a regulator circuit having an input connected to the detector and configured to supply the control signals in response to the transmission line signals;
• and
• a control line connected to the regulator circuit and the control port of the antenna, and configured to supply the control signals to the antenna.

An antenna tuning system for a mobile wireless communication device comprising:

• an antenna comprising:
• an active element having a variable electrical length responsive to control signals, an antenna port configured to communicate electromagnetic communication signals, and a control port connected to the active element to accept the control signals;
• a transmission line communicably connected to the antenna port;
• a transceiver communicably connected to the transmission line, and configured to receive and transmit the communication signals via the transmission line;
• a detector having an input operatively connected to the transmission line, and configured to sense signals on the transmission line, the sensed signals being a reflection of the communication signals;
• a regulator circuit having an input connected to the detector and a memory with coupler signal strength measurements cross referenced to the frequencies of coupled signals, the regulator circuit configured to supply the control signals in response to the transmission line signals and to supply a frequency offset control signal responsive to the reference signal;
• and
• a control line connected to the regulator circuit and the control port of the antenna, and configured to supply the control signals to the antenna.