A Wilkinson power combiner (202) is described that includes a high-pass, HP, frequency circuit (500, 550), wherein the HP frequency circuit (500, 550) comprises at least one of: (i) one input port (510) coupled to at least two output ports (512, 514) via at least two paths; and an input shunt inductor (520) coupling the input port (510) to ground; wherein the one input port (510) is coupled to the at least two output ports (512, 514) via respective series capacitances (230, 238) on the at least two paths, which in cooperation with the input shunt inductor (520) forms a first HP frequency circuit; and (ii) at least one resistor (554, 526) - inductor (552, 524), R-L isolation circuit (500, 550) configured to couple the at least two output ports (512, 514) that forms a second HP frequency circuit.