Ultra-Wideband 3-Way Equal-Power Divider based on Multi-Section Chebyshev Matching Method

In this paper, an ultra-wideband (UWB) 3-way power divider is proposed. It employs a three-section Chebyshev matching transformer to enhance the bandwidth. In addition, three pairs of isolation resistors connecting the three branches are utilized to improve the port isolations. The simulation results show that it operates in the frequency range from 1.0 to 6.3 GHz, i.e., a fractional bandwidth of 630%. In its operating band, the insertion losses of the three ways are within 0.8 dB variation compared with the theoretical values, and the transmission phase fluctuations between the output ports are less than 5°. The isolations between the three output ports are greater than 10 dB. These advantageous performance characteristics make it an alternative candidate as a network feed with both constant-amplitude and in-phase transmission characteristics for UWB array antennas.