| 摘要 |
In a cabinet (3) of portable radio equipment, two transmitting/receiving antennas (1, 2) are placed orthogonal to each other. These transmitting/receiving antennas (1, 2) are connected via a power distributor (5) to a radio unit (4). A tilt angle detector (9) detects the tilt of the cabinet (3). A control circuit (10) controls impedance transformation circuits (6, 7), based on the detected tilt angle, to alter the weighting of a distribution ratio of power being fed to the respective antennas. A composite impedance adjustment circuit (8) adjusts total composite impedance of the transmitting/receiving antennas (1, 2) and the radio unit (4). <IMAGE> |
