Antenna system and method for full duplex wireless transmission with channel phase-based encryption
First Claim
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1. An apparatus comprising:
- a first active antenna element;
a first plurality of switchable radio-frequency reflectors positioned around at least the first active antenna element;
a second active antenna element;
a transceiver including transmit circuitry and receive circuitry; and
a crossbar switch selectable between;
a first state in which the crossbar switch connects the first active antenna element to the transmit circuitry, the transmit circuitry configured to transmit a first signal to a device using the first active antenna element, and the crossbar switch connects the second active antenna element to the receive circuitry, the receive circuitry configured to receive a second signal from the device using the second active antenna element and to measure a channel phase value based on a phase difference between the first signal and the second signal; and
a second state in which the crossbar switch connects the first active antenna element to the receive circuitry, the receive circuitry configured to receive a third signal from the device using the first active antenna element, and the crossbar switch connects the second active antenna element to the transmit circuitry, the transmit circuitry configured to transmit a fourth signal to the device using the second active antenna element based on the received third signal.
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Abstract
An antenna assembly includes a first active antenna element and a second active antenna element, each of which may be a dipole. A first set of independently-switchable radio-frequency reflectors are positioned around at least the first active antenna element. These first switchable radio-frequency reflectors may also be positioned around the second active antenna element. Alternatively, a second set of independently-switchable radio-frequency reflectors may be positioned around the second active antenna element. The switchable reflectors enable controlled perturbation of the communication channel between the antenna assembly and a remote communications node, enabling securely encrypted communications.
155 Citations
20 Claims
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1. An apparatus comprising:
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a first active antenna element; a first plurality of switchable radio-frequency reflectors positioned around at least the first active antenna element; a second active antenna element; a transceiver including transmit circuitry and receive circuitry; and a crossbar switch selectable between; a first state in which the crossbar switch connects the first active antenna element to the transmit circuitry, the transmit circuitry configured to transmit a first signal to a device using the first active antenna element, and the crossbar switch connects the second active antenna element to the receive circuitry, the receive circuitry configured to receive a second signal from the device using the second active antenna element and to measure a channel phase value based on a phase difference between the first signal and the second signal; and a second state in which the crossbar switch connects the first active antenna element to the receive circuitry, the receive circuitry configured to receive a third signal from the device using the first active antenna element, and the crossbar switch connects the second active antenna element to the transmit circuitry, the transmit circuitry configured to transmit a fourth signal to the device using the second active antenna element based on the received third signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method comprising:
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transmitting from a first device to a second device, a first signal using a first active antenna element, wherein the first active antenna element includes a plurality of switchable radio-frequency reflectors positioned around the first active antenna element; receiving at the first device, a second signal using a second active antenna element, the second signal generated by the second device in response to receiving the first signal; measuring at the first device a channel phase value based on a phase difference between the first signal and the second signal; receiving at the first device a third signal using the first active antenna element, the third signal generated by the second device; and transmitting from the first device to the second device, a fourth signal using the second active antenna element, the fourth signal generated based on the received third signal. - View Dependent Claims (20)
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Specification