A MINIATURIZED THREE-PORT DIVIDER/COMBINER

International audienceWe propose a new topology based on a semi-lumped complex impedance transformer for the design of miniaturized power dividers. Our design is based on an impedance transformer in the input branch and a loop in the output branches. The input impedance transformer is constituted by a transmission line loaded with a capacitor. A prototype has been realized using hybrid technology for a 1 GHz operating frequency. The electrical length of the device is 26.4°. This leads to a miniaturized device, more than three times shorter than a typical Wilkinson power divider. This divider exhibits insertion loss lower than 0.3 dB, return loss better than 20 dB and the isolation between the two output ports above 20 dB. Moreover, the low-pass behavior of the input impedance transformer leads to a good rejection of the third harmonic