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In this paper, defected ground structures have been implemented in order to obtain effective size reduction and harmonic suppression in dual-frequency Wilkinson power divider (WPD). At first, a dumbbell DGS is applied into dual-frequency WPD and both operating frequencies have been decreased as half as the previous ones. Therefore, 49% size reduction has been achieved. Second, by using spiral DGS, suppression for the second and third harmonics are achieved. Second harmonic of first operating frequency is suppressed by -21dB. Second and third harmonics of second operating frequency are suppressed by -37dB. There is a good agreement between simulated and measured results.

Improved dual-frequency Wilkinson power dividers with Defected Ground Structure