The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 20, 1999
Filed:
Dec. 05, 1996
David R Heine, Albuquerque, NM (US);
Mark H Ballance, Albuquerque, NM (US);
Raymond Sokola, Albuquerque, NM (US);
Protap Pramanick, Saskatoon, CA;
Motorola Inc., Schaumburg, IL (US);
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.