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:
Nov. 26, 2002
Filed:
Oct. 23, 2001
Young Su Kim, Ulsan, KR;
NRD Co., Ltd., Ulsan, KR;
Abstract
Disclosed is a metal post filter assembly, of a millimeter wave band, using an NRD guide. A filter to which an electromagnetic wave travels is disposed in a filter housing which includes parallel conductive plates facing each other. The filter forms a plurality of inserting holes, by segmenting them into multi-stages, along the length direction of side surface of a dielectric line and parallel to the parallel conductive plates. The filter has a structure that multi-staged dielectric resonators are formed in a single body by inserting metal posts which provide discontinuous surfaces which cause a reflection with respect to the electromagnetic wave in each of the inserting holes. Each impedance of the multi-staged dielectric resonators has an impedance coupling relationship that the impedance becomes gradually and symmetrically smaller to both end stages. According to the impedance coupling relationship, a reflection amount of, and a transmission amount of, the electromagnetic wave traveling along the filter are properly determined. As a result, the filter provides a filtering function which selectively passes only a certain frequency band of the electromagnetic wave. The filter assembly is suitable for a commercial use due to its simple structure, a small loss and superiority in processing, assembly and productivity.