Signal transmitter utilizing ask modulation wave

A signal transmitter utilizing an ASK modulation wave, the signal transmitter comprising:

• a modulator circuit for outputting a first modulated signal through an ASK modulation of a data signal using an ASK modulation signal under a condition that the ASK modulation signal and data signal are synchronized with each other;
• a first push-pull circuit for executing a push-pull operation based on the first modulated signal;
• a first resonance circuit including a first coil antenna and a first capacitor, the first resonance circuit for transmitting a transmission signal in a radio wave through a resonance of the first coil antenna and the first capacitor under a condition that the first push-pull circuit is executing the push-pull operation;
• and
• a switching device connected between the first resonance circuit and a ground for switching to disconnect or connect the first resonance circuit and the ground,
• wherein the modulator circuit controls the switching device to cut off a connection between the first resonance circuit and the ground in synchronization with the first modulated signal.