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:
Jan. 27, 2009
Filed:
Apr. 29, 2005
Jukka Puoskari, Tupos, FI;
Jouni Ala-kojola, Kempele, FI;
Jukka Puoskari, Tupos, FI;
Jouni Ala-Kojola, Kempele, FI;
Filtronic Comtek Oy, Kempele, FI;
Abstract
A band stop filter comprises a transmission line with center and outer conductors, and coaxial resonators. The outer conductor forming a unitary conductive housing with an inner space divided by conductive partition walls into resonator cavities. Each of the resonator cavities contains at least one of the coaxial resonators, wherein each of the coaxial resonators separately has an electromagnetic coupling to the transmission line. The coupling arranged by a coupling element to form an attenuation peak in the a response curve of the filter, where the natural frequencies of the coaxial resonators differ from each other to shape the response curve of the filter. The transmission conductor is located inside the housing, running through openings in the partition walls across all the resonator cavities. The housing is the outer conductor of the transmission line, and a portion of the transmission conductor in a resonator cavity is the coupling element.