| 摘要 |
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 zero 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. <IMAGE> |
