| 摘要 |
PURPOSE:To control attenuation, by fitting an electromagnetic wave absorbing body at one side of a broad conductor provided on a ferrite base and changing the stregth of magnetic field applied to the ferrite. CONSTITUTION:Since the distribution of electric field of microwave power from an input terminal 1 to an output terminal 5 is biased with a magnetic field applied vertically to a base 6, when an electromagnetic wave absorbing body 8 is provided at one side of a conductor 7, a part of the microwave power is absorbed to the body 8 and the attenuation from the terminal 1 to 5 can be varied according to the strength of magnetic field. The strength of magnetic field is varied with a current flowing to an electromagnet located at the conductor 7. With such a simple construction, the attenuation can be varied. |
