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:
May. 12, 1998
Filed:
Jan. 16, 1996
Ming-Jong Shiau, Cerritos, CA (US);
John C Tippet, Rancho Palos Verdes, CA (US);
TRW Inc., Redondo Beach, CA (US);
Abstract
A multioctave multiplexer (10) with multiple independent filter channels with a circuit topology that employs a planar circuit segment (18) and conventional combline resonator circuits (38), (40) and (42). The planar circuit segment (18) forms a common input (28) etched on a substrate and concurrently feeds RF signals to the independent channels (12), (14) and (16). The first planar circuit segment (18) comprises two unit elements (51) and (52) and a .pi.-section capacitor network (54), (56) and (58). The second combline circuit segment (38) comprises shunt resonators (38a), (38b), and (38c) and inter-resonator inductors (44a), (44b) and (44c) . The first and second circuit segments generate a number of transmission zeros on a complex plane that is 2 at DC, 2N-4 at one-quarter wavelength and 2 at the complex frequency of S=+/-1 in the complex plane. The planar common junction multiplexer provides the advantages of low manufacturing cost and the ease of assembly of the prior art without sacrificing any loss in performance and equivalent performance of the more costly high precision conventional combline resonator multiplexers.