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:
May. 17, 2011
Filed:
Sep. 26, 2006
Roman Kravchenko, Graz, AT;
Denys Orlenko, Munich, DE;
Georgiy Sevskiy, Munich, DE;
Patric Heide, Vaterstetten, DE;
Roman Kravchenko, Graz, AT;
Denys Orlenko, Munich, DE;
Georgiy Sevskiy, Munich, DE;
Patric Heide, Vaterstetten, DE;
Epcos AG, Munich, DE;
Abstract
A bandpass filter is described herein. The bandpass filter has two parallel signal branches, each connected, on an input side, to an input node and, on an output side, to an output node. The two signal branches form a ring resonator, having a wave mode with a complex amplitude of {right arrow over (U)}=|{right arrow over (U)}|exp{−jφ} propagating in a clockwise direction and a wave mode with a complex amplitude of {right arrow over (U)}=|{right arrow over (U)}|exp{−jφ} propagating in a counterclockwise direction. The vector sum of a resulting wave {right arrow over (U)}at the output node of the bandpass filter at two or more stop frequencies is: {right arrow over (U)}={right arrow over (U)}+{right arrow over (U)}=0, and |{right arrow over (U)}|=|{right arrow over (U)}| and |φ−φ|=180°. The stop frequencies are arranged such that a passband is formed between two stop frequencies.