A High Efficiency D-band 32-Channel Radial Waveguide Power Divider/Combiner

In this paper, a high efficiency D-band 32-channel power divider/combiner is proposed. The design incorporates rectangular waveguide, coaxial line, radial waveguide, and three matching transitions. The electromagnetic wave is fed by a center rectangular waveguide port and then transmits to the radial waveguide through a coaxial line. Next, the electromagnetic wave is transferred from the radial waveguide to 32 rectangular waveguide ports. Note that three matching transitions are utilized to overcome the discontinuity in transport nodes. Based on such direct power divider configuration, this radial power divider/combiner has the merit of high efficiency with a large number of channels. To verify the mechanism, a D-band 32-channel radial power divider/combiner is fabricated and measured. The measured minimum insertion loss of two power dividers with back to back configuration is 2.74 dB, which is equivalent to the combination efficiency of 72.9 %.