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. 27, 2010
Filed:
Jun. 13, 2008
Ming Yu, Waterloo, CA;
S. Vahid Miraftab, Kitchener, CA;
Ming Yu, Waterloo, CA;
S. Vahid Miraftab, Kitchener, CA;
Com Dev International Ltd., Cambridge, CA;
Abstract
A cavity microwave filter assembly for filtering an electromagnetic wave including a plurality of cavity resonator assemblies, where each cavity resonator assembly has a bottom and including at least one lossy element for electromagnetically coupling two elements of the filter assembly, where at least one element is a cavity resonator assembly. The lossy elements provide attenuation in the loss variation of the filter and sharper slopes resulting in an improved Q factor for the filter. A method for realizing lossy elements as resistors requires determining an equivalent circuit model that can be manufactured using resistors, coupling elements, and transmission lines. The method includes representing the resistive element with a resistor, unity admittance inverters and coupling elements and then scaling to determine the resistor and coupling values. The method further includes replacing the admittance inverters with transmission lines of the appropriate length to account for the specific design of the filter.