Design of Miniaturized Four-way Power Divider with Predefined Sequential Phase Difference for Antenna Feed Network

The manuscript presents a miniaturized four-way power divider with a sequential phase difference of 90°. The proposed power divider is designed using one rat-race coupler (RRC) and two branch-line couplers (BLC). For the minia-turization three open stub conversion of a single transmission line technique with meandering has been used. A Four-way power divider for the frequency of 145.825 MHz is designed and fabricated to discuss the proposed concept. The measured result shows a low insertion loss of 6.7 to 6.8 dB at each output ports. Also, the return loss for each port is better than 20 dB. Isolation between different output ports are better than 30 dB. The measured phase imbalance at each port is not more than 3°. The fabricated circuit size is
$0.265 \lambda_g \times 0.275 \lambda_g$
.