| 摘要 |
PROBLEM TO BE SOLVED: To provide a compact and light band pass filter using a resonator where the both top ends of a 1/2 wavelength line are opened capable of fulfilling desired rejection band characteristics without increasing the number of stages of resonance lines. SOLUTION: A conductor line formed at the surface of a dielectric board 10 comprises conductor lines 31 and 32 for input/output designed with predetermined characteristic impedances, intermediate taps 33 and 34 for input/output to a band filter, one-side grounded and top end-opened conductor lines 11 and 12 formed with width W, a pass band frequency f<SB>1</SB>, and 1/4 wavelength (λ<SB>1</SB>/4), and top end-opened conductor lines 21 and 22 for ground side substitution formed with a pass band frequency f<SB>1</SB>, 1/4 wavelength (λ<SB>1</SB>/4), and width W. Thus, a resonator with a both-end opened 1/2 wavelength line is configured of the interdigital connected conductor lines 11 and 12 and top end-opened 1/4 wavelength conductor lines 21 and 22 for ground side substitution. COPYRIGHT: (C)2004,JPO
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