Patent ID: 9178262
Filing Date: 2015-11-03
Classification: H01P

Abstract:
1. A feed network comprising: three radio frequency (RF) devices constructed on a printed circuit that provides a five-port microwave device having a sum port and four feed ports, the printed circuit including a first circuit element layer, a dielectric bonding layer, and a second circuit element layer arranged in a stack with the dielectric bonding layer extending between the first and second circuit element layers, the first and second circuit element layers each including a respective conductive circuit element sub-layer, a respective conductive ground plane layer, and a respective dielectric substrate between the corresponding circuit element sub-layer and the corresponding ground plane layer, the three RF devices including at least one coupled-line quadrature hybrid and at least one Marchand balun, wherein respective portions of the at least one coupled-line quadrature hybrid and the at least one Marchand balun being defined by each of the circuit element sub-layer of the first circuit element layer and the circuit element sub-layer of the second circuit element layer; wherein each of the at least one coupled-line quadrature hybrid has only a respective single transmission line section providing two corresponding outputs with approximately equal amplitude power and a phase difference of 90°; wherein each of the at least one Marchand balun includes two offset-coupled transmission line sections separated by a gap and two outputs on opposite sides of the gap, the two outputs having approximately equal amplitude power and a phase difference of 180°; and wherein the three RF devices are electrically arranged relative to the sum port and the four feed ports such that the feed ports have equal amplitude power and a progressive 90° phase shift.