Patent ID: 8242951

Claim:
A two-element array antenna system, comprising: a first antenna element and a second antenna element, the first antenna element comprising a first frequency multiplier, the second antenna element comprising a second frequency multiplier; and a transmitting, receiving, and processing (TRP) system coupled to the first and second antenna elements, the TRP system being coupled to the first antenna element via a single first transmission element, the TRP system being coupled to the second antenna element via a single second transmission element, wherein the TRP system is configured to: transmit to the first antenna element a first input signal at a sub-multiple of a first frequency, receive from the first frequency multiplier a first calibration signal based on the first input signal, transmit to the second antenna element a second input signal at a sub-multiple of the first frequency, receive from the second frequency multiplier a second calibration signal based on the second input signal, and determine, based on the first and second calibration signals, a relative phase difference between the first and second transmission elements.