System and method for modulating a frequency signal
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United States of America Patent
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Aug 14, 2001
Grant Date -
N/A
app pub date -
Jul 20, 1998
filing date -
Jul 20, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A radio frequency transmitter circuit including a user input switch for producing an input signal, an oscillator for producing a frequency signal having a first frequency, an antenna connected to the oscillator for broadcasting the frequency signal, a coupling circuit disposed a predetermined distance from the antenna, and a microprocessor for enabling the oscillator and activating the coupling circuit in response to the input signal. When the coupling circuit is activated, a reflected impedance, derived from a change in inductance, is reflected from the coupling circuit upon the antenna thereby shifting the frequency signal to a second frequency. Sequentially activating and deactivating the coupling circuit modulates the frequency signal.
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