| 摘要 |
PURPOSE:To improve detection sensitivity by combining an unreversible circuit, allowing several different-frequency signals to pass through, with a filter which allows or disallows them to pass through independently. CONSTITUTION:Hybrid 11 where signal lines 11a and 11b are connected is connected to circuit systems 15 and 16; circuit system 15 is formed of filter 15a, terminal 15e, curculator 15g, and terminal 15h, and circuit system 16 is similarly formed. By way of hybrid 11, signals from signal lines 11a and 11b of frequencies f1 and f2 are supplied to filter 15a, where while the signal of frequency f2 is cut off, that of frequency f1 is passed and sent to terminal 15e, so that the signal of f2 will be sent out as a detection signal to terminal 15h by circulator 15g. Therefore, the signal of f1 sent to terminals 15e and 16h can be used effectively without mutual interference, so that detection sensitivity can be improved. |
