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. 20, 2003
Filed:
Sep. 19, 2001
Erkki Niiranen, Ii, FI;
Tapani Vistbacka, Kempele, FI;
Filtronic LK OY, Kempele, FI;
Abstract
The invention relates to a high-pass filter realized in a conductive casing by means of mechanical structural elements, which filter is suitable for signal processing especially at microwave frequencies. In the casing ( ) there are in series rigid conductive elements ( IN, OUT) separated from each other. Between successive elements there is capacitance that can be adjusted within certain limits, if necessary. The insulating material between the elements is air or plastic, for example. At least some of the conductive elements involve a conductor ( ) less than half a wavelength long, short-circuited at the opposite end to the casing. This together with the casing connected to the signal ground provides a transmission line which, looking from the conductive element, is inductive at the operating frequencies. A signal path is thus provided in the filter with capacitance in the longitudinal direction and inductance in the transversal direction between each two capacitive elements. The structure is simple and sturdy, which means relatively good power handling capacity and reliability. In addition, the structure has few boundaries that may cause harmful intermodulation.