No abstract

No abstract

A modified design that can reject the nth harmonic output in the Wilkinson power divider is presented. After adding transmission lines between the resistor and each output port of the traditional design, a solution of the modified Wilkinson divider can be found. Experimental results show the third harmonic suppression to be 237.0 dB, while maintaining conventional performance at the fundamental frequency.Introduction: A Wilkinson power divider provides port matches and complete isolation at a frequency and its odd harmonics. It can also perform an insufficient division under port mismatches and incomplete isolation at its even harmonics [1]. Additional rejection filters become necessary in order to suppress its harmonics in the divider.In [2], a power divider with nth harmonic suppression was proposed by adding open stubs at the centre of quarter-wave transformers. However, its physical dimensions become larger owing to the added stubs and an inductor in parallel with a resistor should be added. Subsequently, design methods featuring an asymmetric spiral defected ground structure, an anti-coupled line, and a bandgap cell in transformer lines [3][4][5] are used to suppress the nth harmonics. The combination of bandgap elements and open stubs was found in [6]. However, there are disadvantages in their inherent structures according to the design frequency and the desired suppression terms.In this Letter, by adding stub segments between the resistor and the output ports and then modifying the traditional design parameters, a valid solution to reject the nth order component is found.