Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Patent
1996-12-05
1999-07-20
Ham, Seungsook
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
333212, H01P 1207
Patent
active
059260793
ABSTRACT:
A ceramic waveguide filter made from a monolithic block of dielectric ceramic material which has longitudinally spaced resonators is described. Resonant structures having a grounded portion and ungrounded portion, each of the resonant structures being inductively coupled at the ungrounded portion describe the electrical schematic which corresponds to the waveguide filter. The positioning of the input and output on the block of dielectric ceramic material define a passband and also create a shunt resonant section. The shunt resonant section is associated with a shunt zero in the electrical schematic of the waveguide filter. Finally, the dielectric block of ceramic is mostly coated with an electrically conductive coating material with the exception of an uncoated area immediately surrounding the input and output. An extracted pole in the form of a shunt zero can provide a frequency response with a high side zero, low side zero, or both, and two extracted poles in the form of two shunt zeros can provide two high side zeros, two low side zeros, or one zero on each side of the passband. These features together provide a ceramic filter with a extracted pole.
REFERENCES:
patent: 4607242 (1986-08-01), Cozzie
patent: 4837535 (1989-06-01), Konishi et al.
patent: 4879533 (1989-11-01), De Muro et al.
patent: 4963844 (1990-10-01), Konishi et al.
Ballance Mark H.
Heine David R.
Pramanick Protap
Sokola Raymond
Cunningham Gary J.
Ham Seungsook
Motorola Inc.
Raufer Colin M.
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