Miniaturization and Harmonic Suppression of Power Divider using Coupled Line Section for High Power Applications

Abstract

This paper presents a compact transmission line based on the coupled line section to reduce the circuit size of Gysel power divider (GPD). The line composed of one direct line and one coupled line section. The coupled line section consists of two series lines and one coupled line. The proposed line not only reduces circuit size but also improve the out-off band performance. To validate the properties of the line, a GPD) is designed at 1 GHz. The physical size of the GPD occupies only 38% (0.32λg×0.16λg, λg¬ is the guided wavelength) circuit area compared to reference GPD. Furthermore, the proposed design includes 2nd order harmonic suppression with attenuation level better than -20 dB. The GPD is designed with a substrate of dielectric constant of 2.2, thickness of 0.787 mm, and loss tangent 0.0009.