Design of a Compact Low Loss Four-Way Power Divider at W-band

We have developed a compact, wideband four-way power divider operating in the W-band, employing a Riblet-type coupler and compared its performance with the conventional four way power divider developed by concatenating two two-way E-plane power divider to the output of a two -way E-plane power divider or the turnstile power divider which has structural similarity to a turnstile, a rotating gate, and functions by distributing electromagnetic energy into separate waveguide paths. This Riblet power divider enables efficient coupling between four adjacent waveguides through narrow walls. To enhance the power divider's performance, we've incorporated a taper in the input central waveguide, improving the return loss. Moreover, the power divider exhibits acceptable return loss and isolation between the output ports across the 81-86 GHz frequency range. Additionally, the amplitude imbalance between the output ports is minimal. The power divider boasts a fractional bandwidth of 5.98 %, and its coupling length is 1.7 times the guided wavelength $(\lambda g)$.