Band rejection filter with attenuation poles
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsHiromitsu Uchida, Moriyasu Miyazaki, Yoshihiko Imai, Norio Umemura, Junko Nakayama, Hirotaka Kamino
Life of this patent
Estimating the term…
Abstract
A band rejection filter with attenuation poles includes a plurality of series resonant circuits having end terminals connected in common and other end terminals connected in series via a plurality of transmission lines each having a length that is an odd multiple of about the one-quarter wavelength at the resonance frequency of the plurality of series resonant circuits, and a jump-coupling circuit for roughly coupling two of the plurality of series resonant circuits, which are not adjacent to each other, to each other.
Claims16
A band rejection filter with attenuation poles comprising:
- a plurality of series resonant circuits with one set of end terminals having a common connection which is an equipotential node, and another set of end terminals, each connected through via separate transmission lines each having a length that is an odd multiple of about a one-quarter wavelength corresponding to a resonance frequency of the plurality of series resonant circuits;
- and
- a jump-coupling circuit for coupling pairs of non-adjacent series resonant circuits, belonging to the plurality of series resonant circuits, to each other.
A band rejection filter with attenuation poles comprising:
- a plurality of parallel resonant circuits each connected to one of a pair of transmission lines having a length that is an odd multiple of about a one-quarter wavelength corresponding to a resonance frequency of the plurality of parallel resonant circuits;
- and
- a jump-coupling circuit for coupling two parallel resonant circuits, belonging to different transmission lines, to each other.
A band rejection filter with attenuation poles comprises:
- a plurality of parallel resonant circuits each connected through separate transmission lines having a length that is an odd multiple of about a one-quarter wavelength corresponding to a resonance frequency of the plurality of parallel resonant circuits;
- and
- a jump-coupling circuit for coupling two non adjacent parallel resonant circuits, belonging to the plurality of parallel resonance circuits, to each other, wherein said jump-coupling circuit includes a high impedance line having a length that is an odd multiple of about the one-quarter wavelength at the resonance frequency of the plurality of parallel resonant circuits, a low impedance line having substantially the same length as said high impedance line, and another high impedance line having substantially the same length as said high impedance line, which are connected in series.
Dependencies are inferred from the claim text.