PURPOSE: To offer a planar dielectric filter, which is compact and excellent in soldering penetration or corrosion resistance, generating no sprious characteristics at the odd-numbered folding frequency of a passing frequency and extremely reducing no load Q or the less dispersion of a resonance frequency at the planar dielectric filter used for various radio communication equipments or measuring instruments, etc.
CONSTITUTION: At the planar dielectric filter having the structure of both opened terminals, both-end grounded terminals or one grounded terminal, between first and second facing ground faces 7 and 8, strip conductors 3 and 4 are constituted in the shape of having wide/narrow parts 3a, 3b, 4a and 4b at more than one point of conductor width, or the conductor width of the strip conductor is formed in shapes 3b and 4b so as to be gradually increased/ decreased.
FUKUSHIMA FUMIO
NISHIMURA HIROHARU
SASAKI KATSUMI
YONEDA TAKEHIKO
TAGI HIROMITSU
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