Analytical Design of the Radial Power Divider With Wide Isolation Bandwidths

The theoretical design of radial power divider with wide isolation bandwidths is proposed. This radial power divider can distribute a microwave signal into four directions without sacrificing the bandwidth performance. Moreover, by series connecting shorted stubs with four resistors which are shunted at four output ports, the isolation bandwidths among four output ports can be broaden. In order to validate the proposed circuit at 1 GHz, the compact radial power divider is fabricated. The wideband bandwidths of the fabricated radial power divider on -20 dB output matching and isolation are greater than 74.4% and 133.7%, respectively.