Artificial magnetic conductor antennas with shielded feedlines
AssigneeWemtec, Inc.
InventorWilliam E. McKinzie, III
Life of this patent
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Abstract
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.
Claims31
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.
An antenna system, comprised of:
- an artificial magnetic conductor configured to have a surface-wave bandgap, comprising:
- a frequency selective surface (FSS);
- a substantially continuous conductive surface disposed apart from the FSS;
- a dielectric layer disposed between the FSS and the substantially continuous conductive surface;
- a plurality of conductive elements connecting the FSS and the substantially continuous conductive surface;
- an antenna disposed such that the FSS lies between the antenna and the substantially continuous conductive surface;
- and
- a transmission line having an outer conductor and an inner conductor penetrating the substantially continuous conductive surface and having the outer conductor connected to the continuous conductive surface and the outer conductor extending through the dielectric layer to connect to the FSS, and the inner conductor connected to a feed point of the antenna.
Dependencies are inferred from the claim text.