Design of an Ultra-Wideband Power Divider with Quarter wavelength Short-circuited Stubs

A microstrip line ultra-wideband (UWB) power divider (PD) is proposed, analyzed, and designed. This division is achieved by installing a UWB power divider consisting of a single 50-ohm transmission line in the horizontal plane and 3-Quarter wavelength(λ/4) short-circuited stubs (QWSCS) loaded in the vertical plane. One of the stubs is in the middle of one side of the 50-Ωtransmission line, while the other two, of the same proportions, are in symmetrical positions on the other side of the transmission line. All of the stubs are separated by about a half wavelength. Between the two output ports, a single resistor is suitably placed to improve isolation. Following a simple transmission line theory study, it is demonstrated that 3–4 dB power splitting from one input to two output ports, high impedance matching at all three ports, and excellent isolation between two output ports are produced within the specified 3.5-12 GHz UWB range.