Method and system for producing antenna element signals for varying an antenna array pattern

A system for producing a plurality of antenna element signals for producing a selected antenna array pattern, said system comprising:

• a transform matrix having first and second inputs and first and second outputs, said first and second outputs providing said plurality of antenna element signals for producing a selected antenna array pattern;
• first and second amplifiers having outputs coupled, respectively, to said first and second inputs of said transform matrix;
• first and second amplitude and phase sensors coupled to said outputs of said first and second amplifiers;
• a gain and phase error measurement circuit coupled to said first and second amplitude and phase sensors;
• a gain and phase correction circuit, responsive to said gain and phase error measurement circuit, having an output coupled to an input of said first amplifier;
• first and second signal combiners having at least a first and a second signal combiner input, and having outputs coupled, respectively, to an input of said gain and phase correction circuit and an input of said second amplifier;
• first and second signal gain modifiers, said first signal gain modifier having an output coupled to said second signal combiner input of said first signal combiner, and said second signal gain modifier having an output coupled to said second signal combiner input of said second signal combiner;
• and
• first and second modulators, said first modulator having an output coupled to said first signal combiner input of said first signal combiner and to an input of said second signal gain modifier, said second modulator having an output coupled to said first signal combiner input of said second signal combiner and to an input of said first signal gain modifier.

A system for producing a plurality of antenna element signals for producing a selected antenna array pattern, said system comprising:

• means for modifying the amplitude of a first input signal according to a first factor to produce a first modified signal;
• means for modifying the amplitude of a second input signal according to a second factor to produce a second modified signal;
• means for combining said first input signal and said second modified signal to produce a first combined signal;
• means for combining said second input signal and said first modified signal to produce a second combined signal;
• means for measuring a gain and phase of a first and second amplifier;
• means for modifying the gain and phase of at least one of said first and second combined signals in response to said measured gain and phase to produce first and second amplifier input signals;
• a first amplifier coupled to said first amplifier input signal to produce a first amplified signal;
• a second amplifier coupled to said second amplifier input signal to produce a second amplified signal;
• a transform matrix for transforming said amplified signals and producing said antenna element signals, said transform matrix having first and second inputs coupled to said first and second amplified signals, respectively.