History(from google) Heinrich Hertz(1857-1894 In 1888, Heinrich Hertz built an apparatus that could transmit and receive electromagnetic waves of about 5 meters in I length. he used a coil to generate a high voltage spark between two electrodes which served as a transmitter The detector was a loop of wire with a small gap. A spark at the transmitter produces electromagnetic waves that travel to the detector, producing a spark in the gap. He showed that the waves were polarized, and that they could interfere with each other, just as predicted by theory 上海海学信息工程学院上海海事大学信息工程学院 History (from google) ◼ Heinrich Hertz (1857-1894) ◼ In 1888, Heinrich Hertz built an apparatus that could transmit and receive electromagnetic waves of about 5 meters in length. He used a coil to generate a high voltage spark between two electrodes which served as a transmitter. The detector was a loop of wire with a small gap. A spark at the transmitter produces electromagnetic waves that travel to the detector, producing a spark in the gap. He showed that the waves were polarized, and that they could interfere with each other, just as predicted by theory