CPC H01Q 1/36 (2013.01) [H01Q 3/28 (2013.01); H01Q 5/378 (2015.01)] | 18 Claims |
18. An antenna system, comprising:
a modal antenna comprising a driven element and a parasitic element positioned proximate to the driven element, the modal antenna operable in a plurality of different modes, each mode associated with a different radiation pattern;
a tuning circuit configured to control an electrical characteristic associated with the parasitic element to operate the modal antenna in the plurality of different modes;
a radio frequency circuit;
a transmission line coupling the radio frequency circuit to the modal antenna;
wherein:
the radio frequency circuit is configured to modulate a control signal onto an RF signal using amplitude-shift keying modulation to generate a transmit signal for communication over the transmission line to the tuning circuit; and
the tuning circuit is configured to demodulate the control signal and extract clock information from the control signal to interpret the control signal such that the radio frequency circuit can adjust a mode of the modal antenna via the control signal.
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