Broadband Millimeter Wave Planar Power Combiner/Divider

This work presents a microstrip millimeter wave planar power combiner/divider (4 to 1). The exponential taper is connected to single and multiport transmission lines, using the narrow and wide side, respectively. An oversized transmission line is interfaced between taper wide-side and multiport (four ports) and then multiport are matched by stepped impedance transformer. Both bandwidth enhancement techniques, exponential and stepped impedance transformer, are employed to enhance the performance of the power combiner/divider. It operates in the frequency range 33.5-42.2 GHz with a combining efficiency of about 90%. The divider/combiner ports exhibit a 12dB return loss, an average insertion loss of 7.5dB and isolation of 6dB. Its size is 8.66mm × 17.82mm and the multiport distance 3.12mm.