| 摘要 |
PURPOSE:To eliminate the need for the direct trimming variation of a tuning part by the method of trial and error and to make a high-precision tuning adjustment by providing a coaxial cable which has lambda/4 electric length to the inductance converter of the tuning adjusting device, and connecting a part to be tuned to the cable. CONSTITUTION:A couple of electrodes are arranged at the part 200 to be tuned of the tuning adjusting device opposite each other across a dielectric, and an earth or common terminal is provided to opposite-directional end parts of the electrodes. The inductance converter 203 consisting of the transmission line 201 with lambda/4 electric length and a variable inductance element 202 is connected to the part 200 to be turned. The variation amount of the impedance of the element 202 is converted by a correlator 204 into a necessary adjustment controlled variable, which is applied to an adjusting device 205. The mutual relation of this correlator 204 is set in a correlation controller 207. The tuning device 205 controls an adjustment controller 208 to adjust the tuning frequency of the part 200 with high precision. |
