A 1‐to‐ n way single‐ended‐to‐balanced substrate integrated waveguide filtering power splitter

Abstract

An approach to 1-to-n (n = 3, 4…) way single-ended-to-balanced filtering power splitter (SETBFPS) is proposed. The properly placed balanced ports with 0.5λg (λg is the substrate integrated waveguide [SIW] guided wavelength at f0) space make the TE32nd 103 and TE32nd 105 modes of n 32nd-mode SIW multimode resonators form differential-mode (DM) passband of the SETBFPS. Compared with the state-of-art single-ended-to-balanced power splitters, the proposed approach has all the functions of 1-to-n way, filtering, and common-mode (CM) suppression. A 1-to-3 way prototype is exemplified at 3.5 GHz with the minimum insertion loss (IL) of 0.09 dB, a fractional bandwidth (FBW) for a 15-dB return loss of 35%, and a FBW for 15-dB CM suppression of 52%. Low IL and wide bandwidth can be observed.