| 摘要 |
A RF wireless modem with an integral antenna. The antenna is a compact, horizontally-polarized, balanced, multi-element, directional antenna with integral balun, constructed on one end of a printed wire board (PWB) and radiating preferably away from the modem circuitry on the remaining portions of PWB. The antenna includes a matching network for matching an impedance of the antenna with an impedance of an unbalanced connection and a balun for transforming a RF transmit signal received from the unbalanced connection into a balanced RF transmit signal. The antenna also includes a radiator for transmitting the balanced RF transmit signal and a reflector for reflecting at least some of the energy of the transmitted signal away from the modem circuitry. The antenna can also include a director for directing the RF transmit signal in a desired direction.
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