Metal cylinder cavities for harmonic suppression in stripline power dividers
Compared with microstrip line power dividers, stripline power dividers have higher power capacity and less interference to systems. However, stripline power dividers usually have harmonics, which will affect the transmission characteristics. In this paper, metal cylinder cavities are used to suppress the harmonics of the stripline power dividers, which will greatly improve the transmission characteristics. A 1 to 2 Wilkinson power divider and a cascaded Wilkinson power divider are analyzed with and without the metal cylinder cavities. Calculated and measured results show that the 1 to 2 power divider with the metal cylinder cavity suppresses the harmonics at 2.05 GHz and 3.3 GHz. The cascaded power divider with the metal cylinder cavity suppresses the harmonics at 2.23 GHz, 3.12 GHz and 3.41 GHz.