Fsk production by modification of antenna impedance

H - Electricity – 04 – L

Patent

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H04L 27/12 (2006.01)

Patent

CA 2295191

A radio frequency transmitter circuit (14) including a user input switch (34) for producing an input signal, an oscillator (16) for producing a frequency signal having a first frequency, an antenna (22) connected to the oscillator for broadcasting the frequency signal, a coupling circuit (18) disposed a predetermined distance from the antenna, and a microprocessor (32) 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.

L'invention concerne un circuit émetteur de fréquences radio (14). Ce circuit comprend un commutateur d'entrée d'utilisateur (34) pour générer un signal d'entrée, un oscillateur (16) pour produire un signal de fréquence comportant une première fréquence, une antenne (22) connectée à l'oscillateur pour diffuser le signal de fréquence, un circuit de couplage (18) disposé à une distance prédéterminée de l'antenne, et un microprocesseur (32) pour valider l'oscillateur et activer le circuit de couplage en réponse au signal d'entrée. Lors de l'activation du circuit de couplage, une impédance réfléchie, dérivée d'un changement d'inductance, est réfléchie à partir du circuit de couplage sur l'antenne, ce qui décale le signal de fréquence vers une deuxième fréquence. L'activation et la désactivation séquentielle du circuit de couplage module le signal de fréquence.

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