| 摘要 |
PURPOSE:To stabilize tuning operation and to establish remote control of a tuning frequency by providing a tuning section, an impedance circuit network connected to the tuning section and a transmission line having length nearly equal to an odd number multiple of lambda/4 electric length in the tuning frequency and inserted and connected between the tuning section and the impedance circuit network. CONSTITUTION:The reactance circuit network is connected to the tuning section via a transmission line having length nearly equal to an odd number multiple of lambda/4 electric length in the tuning frequency. The impedance converting function is realized in this way by the combination of the transmission line and the reactance circuit network and the converted reactance having a property opposite to that of the reactance of the reactance circuit network to be converted realized in this way is acted equivalently on the tuning section in parallel or series. For example, a caption 15 is the tuning section in Fig., and an impedance converter 19 comprising the connection of a series resonance circuit to be converted consisting of a varible capacitor 17 and a variable inductor 18 via a coaxial cable 16 of lambda/4 electric length is connected and installed. |
