| 摘要 |
PURPOSE:To attain excellent matching state by detecting a change in an impedance of an antenna during transmission so as to apply tracking control of the output impedance of a transmitter. CONSTITUTION:The reactive component of an impedance Za0 viewing the antenna from a point (f) is adjusted to be zero while the antenna, an inverse reactance generating circuit 2 and a control signal detecting circuit 3 are matched, then the relation of ¦V1¦=¦V2¦, ¦V1¦>¦V0¦ is obtained. When the circuits become in unmatched state, since the relation changes as ¦V1¦<¦V2¦ or ¦V1¦> ¦V2¦, the voltage difference is detected so as to control the inverse reactance generating circuit 2 and a matching circuit 5 thereby keeping the matching state. |
