BALANCED ANTENNA SYSTEM FOR PORTABLE COMPUTERS

摘要

An efficient radio communications device. The device includes a computer and a balanced antenna system that delivers electromagnetic energy to and from the computer via a radio section. The radio section is connected to the computer and the antenna feed and interfaces the antenna system to the computer to facilitate electrical communication between the computer and the antenna system. The balanced antenna system includes an antenna feed for extending radiating elements of the antenna system from the computer to reduce electrical coupling and interference between the computer and electromagnetic energy radiated or received by the antenna system. The antenna system includes a ballun that interfaces the antenna feed to the radio section. In an alternative embodiment, the balun interfaces the antenna radiating elements to the antenna feed. The balun is a lumped or discrete element balun or a bazooka balun. The antenna feed includes a coaxial transmission line. The balanced antenna system includes a dipole antenna. The dipole antenna has approximately symmetrical radiating elements oriented in opposing directions. The radio section includes a transceiver and a duplexer that is connected between the antenna system and the transceiver and facilitates the sharing of antenna system resources between transmit and receive functions.