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 arid a pole voltage of the opposite polarity m accordance with a dinar 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.
Claims9
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 of a first polarity connected to one of said transducers,
- a DC switched pole voltage connected to the other transducer 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.
The modulator as defined in claim I wherein said input transducer is a lead zirconate titanate transducer.
The modulator as defined in claim I wherein said output transducer is a lead zirconate titanate transducer.
The modulator as defined in claim I and comprising a DC blocking capacitor connected in series between the radio frequency input and said input transducer.
A method fix modulating a radio frequency signal comprising the steps of:
- 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,
- poling one of said transducers with a fixed voltage of a first polarity,
- phase modulating the signal on said modulator output relative to said modulator input by switching a poling voltage on the other transducer between said fixed voltage of said first polarity and said fixed voltage of the opposite polarity in accordance with a binary data signal.
Dependencies are inferred from the claim text.