| 摘要 |
PURPOSE:To minimize the insertion loss, by eliminating a ground electrode at the back side of a substrate opposing to a capacitor fitting electrode for preventing the production of capacitance between the capacitor fitting electrode and the ground electrode, relating to a capacitive gap coupling transmission line filter using a microstrip line. CONSTITUTION:A part of ground pattern Ye corresponding to fitting patterns Y05, Y06, Y07 to fix a capacitor via a dielectric substrate epsilonr is eliminated in the titled filter so as to avoid the production of capacitance between the fitting patterns Y05, Y06, Y07 and the ground pattern Ye. The part where the ground pattern Ye is eliminated is a section represented by ls01 in Figure and also by S01. Through the constitution above, the reduction in the band width of the band pass filter due to the capacitance between the fitting patterns Y05, Y06, Y07 and the ground pattern Ye is avoided. |
