Artificial magnetic conductor antennas with shielded feedlines

摘要

An antenna system is described which is comprised of an artificial magnetic conductor (AMC), an antenna element, and a feed network comprised of shielded feedlines whose outer conductor, or shield, is routed through the substrate of the AMC. The feedline outer conductor is connected to both the substantially continuous conductive surface and the array of capacitive patches forming the AMC. The shielded feedline suppresses the excitation of undesired TM modes within the AMC substrate, results in a stable return loss over a frequency range associated with the AMC's high surface impedance and surface wave bandgap.

主权项

1. An electromagnetic radiating structure, comprising:
a frequency selective surface (FSS) comprised of a coplanar array of conductive patches; a substantially continuous conductive plane spaced apart from the FSS; a dielectric layer disposed between the FSS and the substantially continuous conductive plane; a conductive portion disposed facing a side of the FSS distal from the conductive plane; a transmission line having an outer conductor and an inner conductor; and a plurality of conductive elements each element connecting a conductive patch to the substantially continuous conductive plane, wherein the outer conductor of the transmission line is connected to the substantially continuous conductive plane and the outer conductor extends through the dielectric layer to connect to a conductive patch of the array of conductive patches; and, the inner conductor of the transmission line is connected to the conductive portion.