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:
Oct. 20, 1998
Filed:
Feb. 18, 1997
Applicant:
Inventors:
Michael Ludwig, Erbach, DE;
Ralf Rieger, Andelfingen, DE;
Assignee:
Daimler-Benz Aerospace AG, Munich, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01P / ;
U.S. Cl.
CPC ...
333116 ; 333246 ;
Abstract
A directional coupler that can be produced entirely in integrated technology (MIC or MMIC), particularly for the X-band. The directional coupler can be designed for a high coupling attenuation (>30 dB) and a high directivity (>30 dB) with a large relative bandwidth (approximately 20%). This is achieved with a stepped arrangement comprising a plurality of .lambda./4 waveguide sections and coupling capacitors disposed between the respective paths of the coupler.