| 摘要 |
PURPOSE:To block a harmonic frequency of a resonance frequency or an optional frequency by providing a 2nd transmission line coupled with part of a 1st transmission line of a ring form in a way of distrubution. CONSTITUTION:A tuning capacitor 7 and a resonance transmission line 8 form a ring form resonance circuit close to the TEM mode. The resonance frequency depends on the tuning capacitor capacitance and the length of the transmission line. A coupling capacitor 6 is provided as the input/output terminal of the resonance circuit. The input/output terminal of the resonance circuit is the capacitor 6 in general, while the resonance transmission line 8 and the coupling transmission line 9 are coupled in a way of distribution to form another input/ output terminal. Through the structure above, the input and output are isolated. The distribution coupling condition stated as above is adjusted to block the harmonic frequency of the resonance frequency or an optional frequency.
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