Broadband Eight-Way High-Isolation Cavity Power Divider with Low Insertion Loss for MIMO Communication Systems

Nowadays, MIMO technology is one of the hot issues in the development of communication technology. The power dividers have a large role in microwave circuits and it is very important in antenna array systems. This letter presents a broadband eight-way power divider based on the Wilkinson power divider for MIMO communication systems. The power divider is composed of a radial cavity equipped with coaxial probes serving as the power divider circuits, along with microstrip lines loaded with resistors that function as the isolation network. By combining these two parts, the power divider achieves more than 25% operating bandwidth with a theoretical 22.5 dB port isolation. Experimental verification for a C-band (5.8–7.3 GHz) broadband eight-way power divider is presented. Measured results show that the output return loss is better than 18 dB, the isolation is better than 20 dB, and the insertion loss is within 9.03±0.25 dB.