A Power Divider with High Isolation Based on Microstrip Branching Lines for Ka-Band Transceiver Applications

This paper presents a Ka-band power divider with microstrip branching lines (MBLs) based on a dielectric substrate (RT/duroid 5880 with a thickness of 0.254 mm, permittivity of 2.2, and loss tangent of 0.0009). The proposed power divider consists of two microstrip branching lines and a thin-film resistor of 100 ohm connected to the microstrip branching lines, which leads to high isolation and matching between the two output ports of this power divider. This designed power divider is fabricated and measured. Both simulated and measured results agree well with each other, and show that the insertion loss is less than 4.0 dB, the return loss is higher than 19 dB, and the isolation between the two output ports is higher than 30 dB in the band from 35 - 40 GHz.