A Ka-Band Compact Five-Port Power Divider

A compact Ka-band five-port power divider is designed, which consists of three rectangular waveguide ports, one coaxial port and one circular waveguide port. The three rectangular waveguides are connected at an angle of 120°, while the circular waveguide and the coaxial waveguide are located above and below the junction of the three rectangular waveguides, respectively. Two connected probes, a frustum, and two coaxial transitions can broaden the impedance bandwidth. When the circular waveguide port and the coaxial port are matched, the structure is automatically matched. When the circular waveguide port is connected to a matched load, the structure becomes a TEM mode to three-way TE
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mode power divider. Simulation results show that the return losses of the three waveguide ports and the coaxial port are more than 15 dB from 29 to 32 GHz, the isolations between the three rectangular waveguide ports are more than 22 dB, the isolation between the circular waveguide port and the coaxial port is more than 67 dB, and the isolation of the two degenerate TE
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modes of the circular waveguide port is more than 65 dB.