| 摘要 |
The invention provides a loop antenna positioned around the underside edges of a motor vehicle chassis, for transmitting and receiving High Frequency radio signals in the 3 to 33 MHz wavelength region. The loop antenna is an open-ended, non-grounded radiating element that extends around three sides of the vehicle and uses the vehicle as physical support by clipping the high impedance antenna wire near the bottom edges of the vehicle chassis. With such an arrangement, the antenna functions by inserting energy into the vehicle edges where the electric fields are the most intense due to geometrical considerations. The vehicle becomes an efficient antenna because the high impedance antenna wire next to the vehicle body edge efficiently injects energy into the vehicle body, which then acts as a capacitor over ground. |
