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:
Jan. 13, 1987
Filed:
Oct. 31, 1984
Adolph Presser, Kendall Park, NJ (US);
Stewart M Perlow, Marlboro, NJ (US);
RCA Corporation, Princeton, NJ (US);
Abstract
A four-port folded interdigitated coupler has two short conductive strips and three full length conductive strips disposed between the short strips. The full length strips are 1/4 wavelength long at a design frequency. The sum of the lengths of the short strips is 1/4 wavelength at that design frequency. The ends of the short strips remote from the ports are connected together and to the center one of the three full length strips by conductive jumpers. In one embodiment the two full length strips which are not connected to the short strips are connected by a conductive jumper at substantially the same longitudinal position as the jumpers which connect the ends of the two short strips. In this embodiment, the two short strips may have equal lengths or they may have unequal lengths. When their lengths are unequal, their jumpers and the associated jumper between the two outer full length strips are positioned off-center with respect to the longitudinal length of the full length strips. With the short strips having unequal lengths, the jumper between the two full length strips may be omitted. In another embodiment, the short strips have unequal lengths and no jumper connects the outer full length strips at the longitudinal position of the short strip jumpers.