Gysel Power Divider/Combiner for Wideband and Second Harmonic Suppression

This paper proposes a gysel power divider/combiner structure capable of achieving wideband operation and second harmonic suppression. The proposed structure incorporates a stub-based bandpass filter design. Furthermore, heat dissipation characteristics are improved through vias inserted to implement short-circuited stubs. By achieving impedance matching at the center frequency of 3GHz. the proposed structure realizes a wide bandwidth ranging from 2.5GHz to 3.5GHz. Additionally, the characteristics of the short-circuited stubs are utilized to suppress the second harmonic at 6GHz. Experimental results demonstrate a return loss of less than –18dB and a power division level of approximately –3.2dB within the operating band, while achieving harmonic suppression of less than –35dB at 6GHz.