| 摘要 |
A low power remote control transmitter is equipped with a base band signal input, a transistor oscillation circuit, a filter circuit, an antenna launch loop, an oscillating transistor (Q1) and a collector loop connected to vibration inductance (L1). the two ends of the collector and the emitter, as well as the launch grounding resistor (R3) , are all connected to main vibration capacitor (C2, C3) to form said transistor oscillation circuit, the oscillator circuit is internally connected with an acoustic surface resonator (SAW), the oscillation transistor output is connected to a parallel resonant circuit which consists of an inductance (L2 ), a capacitor (C5) ,with an output connected to the antenna launch loop, the antenna launch loop includes micro strip antenna (L3) which is made of a printed circuit board with a copper foil (A), a fine tuning capacitance (CT) which is connected with the micro strip antenna in series, and a coupling capacitor (C7). This device has advantages of simple circuit, high efficiency, excellent performance, high reliability, small size, low cost, simple debugging, and easy-for-large-scale production. |
