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. 23, 1999
Filed:
May. 20, 1997
Applicant:
Inventors:
Nobuhiko Oguma, Tokyo, JP;
Tsunehisa Marumoto, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01P / ;
U.S. Cl.
CPC ...
333113 ; 333117 ;
Abstract
A wavegide hybrid junction includes a coupling section, a coupling hole, and an external cavity resonator. The coupling section is formed by removing by a predetermined length part of a common narrow side wall for isolating two rectangular waveguides. The coupling hole is formed in the upper wall of a waveguide so as to communicate with the coupling section. The external cavity resonator externally cover the coupling hole.