| 摘要 |
PURPOSE: A bandpass filter using a radial stub is provided to form a small filter by using a radial stub instead of an open stub. CONSTITUTION: A bandpass filter(100) comprises a substrate(110), a main-strip line(120), first and second radial stubs(130,150), and first and second feeding lines(161,162). The substrate is made of a dielectric material having a dielectric constant of 2 to 10. The substrate can be made of FR-4, high-resistive silicon, glass, or epoxy, etc. A main stripline is extended onto a strip to be a half wavelength of a center wavelength in a center frequency which is passed through an upper side of the substrate. The first and second radial stubs are symmetrically extended along a longitudinal direction and a direction meeting at right angle of the main-strip line in the center of the main-strip line.
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