Miniaturized broadband three-way power divider with 120° phase differences between output ports

Abstract

This paper presents a miniaturized broadband three-way power divider with 120° phase differences between output ports. The divider is developed by using a cascade connection of 90° Lange couplers and is implemented on an FR4 substrate. For the frequency range of 440–770 MHz, which corresponds to a relative bandwidth of more than 54%, the divider exhibits power splits of −5.3 ± 0.6 dB, return losses greater than 20 dB, and isolation between output ports greater than 19 dB. Furthermore, for the frequency range of 560–580 MHz, the divider exhibits errors in the desired relative phase difference between output ports of less than 4°. The measurement results reveal the feasibility of the proposed power divider configuration for broadband circuit applications with the output ports located well away from each other.