Binary bi-phase shift modulator
AssigneeThe United States of America as represented by the Secretary of the Army
InventorsRoger D. Kaul, Jeffrey S. Pulskamp, Ronald G. Polcawich, Sarah Bedair
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Abstract
A binary bi-phase shift modulator having an input piezoelectric transducer and an output piezoelectric transducer connected in series between a radio frequency input and a radio frequency output. A fixed DC pole voltage having a first polarity is connected to one of the transducers. A DC switched pole voltage is connected to the other transducer which switches between the pole voltage of the first polarity and a pole voltage of the opposite polarity in accordance with a binary data signal. The polarity of the radio frequency input relative to the radio frequency output varies as a function of the polarity of the DC switched pole voltage.
Claims20
A binary bi-phase shift modulator comprising:
- an input piezoelectric transducer and an output piezoelectric transducer connected in series between a radio frequency input and radio frequency output,
- a DC pole voltage source connected to one of said transducers configured to apply a pole voltage of a first polarity,
- a DC switched pole voltage source connected to the other transducer configured to apply a pole voltage which switches between said pole voltage of said first polarity and a pole voltage of the opposite polarity in accordance with a binary data signal so that the phase of the radio frequency input relative to the radio frequency output varies as a function of the polarity of the DC switched pole voltage.
A method for modulating a radio frequency signal comprising:
- connecting an input piezoelectric transducer and an output piezoelectric transducer in series between a modulator input and a modulator output,
- supplying a radio frequency signal to said modulator input,
- applying a pole voltage of a first polarity to one of said transducers,
- phase modulating said modulator output relative to said modulator input by applying a pole voltage on the other transducer that switches between said pole voltage of said first polarity and a pole voltage of the opposite polarity in accordance with a binary data signal.
Dependencies are inferred from the claim text.