Dual band equal power divider with coupled line section using stepped-impedance transformers

A novel Dual band equal power divider with coupled line section using stepped-impedance transformers is presented in this paper. Coupled lines section is used to achieve the necessary impedance transformation at two selected frequencies. The topology of the structure, different from conventional Wilkinson power divider, is the couple lines instead of the transmission lines. In this paper the structure is presents on the Rogers RT5880 substrate, Using CST Microwave studio, by this substrates design there is simulated return loss is greater than 10 dB at center frequencies 6.7 GHz and 8.0 GHz. The average insertion loss is 3 dB and group delays are around 0.90 ns at 6.7 GHz and 0.81 ns at 8 GHz at these two center frequencies. In addition, the isolations between the outputs ports are greater than 10 dB over these two bands.