A novel wideband coupled-line Gysel power divider with function of impedance matching

Abstract

A new coupled-line circuit structure is proposed to design compact wideband Gysel power dividers with function of impedance matching between source and load. Based on traditional even- and odd-mode technique, closed-form equations are obtained for direct and accurate synthesis. By applying coupled lines and reducing their electrical lengths, this novel Gysel power divider has four main advantages: high power-handling capability, small size, enhanced bandwidth, and source-to-load impedance matching. The measured bandwidth ( & dB) of the fabricated Gysel power divider operating at 2 GHz is 62.6%, while the traditional one is 40.8%. Meanwhile, the size of this novel Gysel power divider is only 25.5% of the traditional one when the same substrate is used and the same operating band is considered.

Acknowledgements

This work was supported in part by the Fundamental Research Funds for the Central Universities (No. 2012RC0301), National Natural Science Foundation of China (No. 61201027), and Important National Science & Technology Specific Projects (No. 2010ZX03007-003-04).