Honeywell International Inc.
MULTI-ELEMENT ANTENNA ARRAY WITH INTEGRAL COMPARISON CIRCUIT FOR PHASE AND AMPLITUDE CALIBRATION

Abstract:

Described herein is a calibration circuit for a multiple element antenna with two or more antenna transmit and receive elements. In some examples the multi-element antenna may also include a beamforming network that combine the multiple antenna radiating element inputs and outputs with controlled phase and amplitude relationships such that spatial beams can be formed by varying the phase and amplitudes of two or more signals applied to antenna input ports for the antenna. The calibration circuit of this disclosure may be used to obtain data to determine phase and amplitude offsets induced by the combined transmission elements, and any phase and amplitude offsets induced by the transmitter or receiver circuitry. The determined phase and amplitude offsets may then be removed from received signal measurements and compensated for in transmit signal generation.