| 摘要 |
PURPOSE:To restrain lowering of mismatching attenuation and fluctuation of muB characteristic, by utilizing the parallel capacity of a surge preventing circuit. CONSTITUTION:Inductance 33 which resonates with capacity 11 of surge preventing circuit 5 near frequency f3, where muB characteristic is fluctuated, and has a value to compensate impedance degradation components in frequency f2 is connected in series to equalizer 1. By this inductance 33, impedance degradation and fluctuation of muB characteristic in frequency f2 can be restrained. For the purpose of restraining furthermore fluctuation of muB characteristic and facilitating setting the value of inductance 33, series resonance circuit 22 which resonates near frequency f3, where muB characteristic is fluctuated, is connected in parallel after equalizer 1. By this constitution, muB characteristic and mismatching attenuation are improved. |
