Patent ID: 8319583

Claim:
A radial power combiner/divider, comprising: an RF layer comprising N planar RF transmission lines radiating from a common port to N ports where N is an integer greater than two, said lines configured to transmit electromagnetic waves centered at a wavelength λc, each said RF transmission line having a electrical length of approximately A*λc/4 where is A an integer, an isolation layer substantially parallel to the RF layer, said isolation layer comprising: a star resistor having N resistive arms radiating from a common junction, each of the resistive arms having an electrical length L 1 ; and N planar isolation transmission lines of electrical length L 2 coupled in series to the respective resistive arms, each said series pair of a one of the resistive arms and an one of the isolation transmission lines having a length L 1 plus L 2 approximately equal B*λc/2 where B is an integer; and N vertical interconnects between said RF layer and said isolation layer, each said vertical interconnect connecting an end of one of the N isolation transmission lines to an end of one of the N RF transmission lines at the N ports, respectively.