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:
Feb. 20, 2007
Filed:
May. 18, 2005
Jouni Ala-kojola, Kempele, FI;
Jouni Ala-Kojola, Kempele, FI;
Filtronic Comtek Oy, Kempele, FI;
Abstract
The invention relates to a tunable resonator filter. In each resonator cavity of the filter there is a movable dielectric tuning element () to adjust the resonator's natural frequency. The tuning elements are advantageously arranged to be moved by a common control implemented by a rod () joining them together, to shift the filter's band through equal displacements of the natural frequencies of the resonators. When the tuning element is moved horizontally sidewards from the resonator () axis, the electrical length and natural frequency of the resonator change. In that case, when sub-bands are used it is not necessary to tune the filters separately for each sub-band in the stage of manufacture, as the sub-band can be chosen when the filter is put into use. The tuning elements can be movable also in each resonator separately, to implement the basic tuning in connection with the manufacture of the filter. The basic tuning can be automated, in other words it can be made without inconvenient handwork.