| 摘要 |
PURPOSE:To connect a band stop filter with a microwave band passing filter without deteriorating the transmission characteristic, by setting the impedance of the connecting line of the band stop filter about 2-8% smaller than the value designed to meet a required form of transmission characteristic. CONSTITUTION:A filter connecting circuit is constituted by connecting a band- pass filter 1 equipped with plural resonators and a connecting line connecting the resonators with each other with a band stop filter 3 equipped with resonators having a required form of transmission characteristic and a connecting line connecting the resonators with each other by means of a connecting line 4. The equivalent circuit of this filter connecting circuit is composed of line impedance Z1-Z15 and line lengths l1-l15. Then the line impedance Z15 of the band stop filter 3 is set about 2-8% smaller than a designed value which is set to show a maximally flat, Chebyshev, or other characteristics so that the filter 3 can be connected with the filter 1 with no deterioration of the transmission characteristic. |
