Design of compact C-band one into eight-way equal Wilkinson Power Divider

Wilkinson power divider (WPD) is a widely adopted technique for splitting the microwave signal into two equal or unequal parts and maintaining good isolation between output ports. In order to increase the bandwidth, multi-stage WPD is used. This work aims to design and analyze the performance of a three-stage 1-into-8 Wilkinson equal power divider suitable for frequency band 4-8 GHz. The design has been realized on commercially printed circuit board (PCB) of RO4350B 10-mil substrate. The design was optimized for 1 into 2 two-stage WPD cell, and seven such cells have been utilized according to layout requirement. The overall size of the fabricated circuit is 81.28x25.4 mm. Physical results show average insertion loss at 4 GHz is better than 2.1 dB and at 8 GHz better than 3.95 dB. Return loss is better than 15 dB at both input and output ports. Isolation between adjacent output ports is better than 18.5 dB.