| 摘要 |
An UHF(Ultra High Frequency) band pass filter is provided to improve a pass property, a blocking property, and a broadband stop property by attaching a stub for removing a spurious harmonic resonance mode to an input/output port. A first capacitance parallel line(30) is connected to an input port(IN). A first inter-digital capacitor(40) is serially connected to the first capacitance parallel line. A first inductance linear line(50) is parallel connected to a center part of the first inter-digital capacitor. A second capacitance parallel line(60) is serially connected to the first inter-digital capacitor. A second inter-digital capacitor(70) is serially connected to the second capacitance parallel line. A second inductance linear line(80) is parallel connected to a center part of the second inter-digital capacitor. A third capacitance parallel line(90) is serially connected to the second inter-digital capacitor. A third inter-digital capacitor(100) is serially connected to the third capacitance parallel line. A third inductance linear line(110) is parallel connected to a center part of the third inter-digital capacitor. A fourth capacitance parallel line(120) connects the third inter-digital capacitor to an output port(OUT). |
