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:
Aug. 31, 1999
Filed:
Jan. 12, 1998
Hirofumi Miyamoto, Kanazawa, JP;
Abstract
Stronger electromagnetic coupling than in conventional devices can be provided between adjacent resonator holes in a dielectric filter or a dielectric duplexer without changing the external shape and dimensions of a dielectric block. Resonator holes pass through opposing surfaces of a dielectric block, each including a large-diameter hole section and a small-diameter hole section. The small-diameter hole sections may be formed near a short-circuit end face of the dielectric block. The large-diameter hole sections and the small-diameter hole sections are connected to each other with their axes shifted from each other. The radius R of the large-diameter hole sections, the radius r of the small-diameter hole sections, and the shift distance P between the axes of the large-diameter hole sections and those of the small-diameter hole sections satisfy the expression R-r<P<R+r.