Mobile radio reception with antenna diversity

摘要

The radio receiver system contains a radio receiver (11) and a diversity box (12). Four antennas (3a to 3d) are connected with the amplifiers (4a to 4d) in the box, and the amplified signals are each fed to one of four contacts of a four stage antenna switch (5). The central contact of the switch is connected with a tuner (7) of the radio receiver (12) through the high frequency line (6), and the IF signal from the tuner goes to the evaluating unit (13) in the radio receiver (11). When there is a loss of quality in signal received, a signal goes to the logic unit (14) so that the switch (5) can change to another antenna.