Miniaturization And Harmonic Suppression Of Power Divider Using Coupled Line Section For High Power Applications

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 is 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 is symmetrical and analyzed with even-odd mode analysis to derive design equations. The line not only reduces circuit size but also improves the out-off band performance. To validate the properties of the line, a GPD is designed at 1 GHz. The physical size of this GPD occupies only 38% (0.32 lambda(g)x 0.16 lambda(g), lambda(g) 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 proposed GPD is designed and fabricated on an Arlon substrate of relative dielectric constant of 2.2, thickness of 0.787 mm, and loss tangent 0.0009.