| 摘要 |
PROBLEM TO BE SOLVED: To easily and promptly remove/exclude an unnecessary high frequency signal in the case of a disaster or the like.SOLUTION: An emergency radio filtering device includes a basic stab 2 and a correction stab 3. In the case where a frequency of an unnecessary high frequency signal is low relatively to a predetermined high frequency signal, a length L1 is set on the basis of a wavelength λp of the predetermined high frequency signal in such a manner that one terminal of the basic stab is opened or short-circuited, another terminal is freely connected to a feeder 103 and impedance at a connection point A becomes infinite for the predetermined high frequency signal. The correction stab is connected while being branched from the basic stab 2, and a length L4 is set in such a manner that the impedance at the connection point A becomes zero for the unnecessary high frequency signal.SELECTED DRAWING: Figure 1 |
