Multiband artificial magnetic conductor
First Claim
1. A multi-band artificial magnetic conductor (AMC) comprising an equivalent circuit model, for plane waves at normal incidence, having N shunt capacitors and at least N series inductive elements, arranged in a one port Cauer type I ladder network where N is at least 2, the equivalent circuit having an input impedance with N non-harmonically related resonant frequencies, the capacitors being equivalent sheet capacitances of frequency selective surfaces (FSS) of the AMC.
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Accused Products
Abstract
A multi-band artificial magnetic conductor (AMC) is described in an electrically small antenna for use in handheld wireless devices and base station antenna applications. The multi-band AMC contains a ground plane, two or more frequency selected surfaces (FSS) having periodic conductive patches disposed on opposing surfaces and a dielectric layer sandwiched between the surfaces, and dielectric layers between the FSS layers and between the lower FSS layer and the ground plane. Various parameters of the dual band AMC are chosen such that the AMC has non-harmonically related resonant frequencies within two or more different frequency bands.
65 Citations
62 Claims
- 1. A multi-band artificial magnetic conductor (AMC) comprising an equivalent circuit model, for plane waves at normal incidence, having N shunt capacitors and at least N series inductive elements, arranged in a one port Cauer type I ladder network where N is at least 2, the equivalent circuit having an input impedance with N non-harmonically related resonant frequencies, the capacitors being equivalent sheet capacitances of frequency selective surfaces (FSS) of the AMC.
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11. A method of establishing design parameters of an artificial magnetic conductor (AMC), resonant in a plurality of non-harmonically related frequency bands, the AMC comprising a plurality of frequency selective surfaces (FSSs), each FSS having a layer of periodic conductive patches, the method comprising:
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choosing the non-harmonically related frequency bands;
choosing effective sheet capacitances for each FSS, selecting values for;
gap widths between conductive patches of a first of the FSSs, a chamfer distance for conductive patches of a second of the FSSs, permittivities of dielectric layers between the layers of the conductive patches, between the FSSs, and between one of the FSSs and a ground plane, and thicknesses of the dielectric layers, determining an overlap area of conductive patches on each FSS, determining a periodicity of the conductive patches on each FSS, and determining a chamfer distance for conductive patches of each FSS for which the chamfer distance was not selected.
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12. A method of establishing design parameters of an artificial magnetic conductor (AMC) in a plurality of non-harmonically related frequency bands, the AMC comprising a plurality of frequency selective surfaces (FSSs), each FSS having at least one layer of periodic conductive patches, the method comprising:
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grounding a first conductive layer;
separating the FSSs;
separating the first conductive layer from one of the FSSs; and
connecting the periodic conductive patches on a first layer of the at least one layer of periodic conductive patches of a first FSS of the plurality of FSSs to the first conductive layer and connecting at least some of the periodic conductive patches on a first layer of the at least one layer of periodic conductive patches of a second FSS of the plurality of FSSs to the first conductive layer.
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13. A multi-band AMC comprising:
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a ground plane;
a first frequency selective surface (FSS) separated from the ground plane by a first dielectric layer, the first FSS having a first and a second layer of periodic conductive patches that overlap and are separated by a second dielectric layer, the first layer of conductive patches more proximate to the ground plane than the second layer of conductive patches;
a second FSS separated from the first FSS by a third dielectric layer, the second FSS having a third layer of periodic conductive patches, the second FSS more distal to the ground plane than the first FSS; and
a periodic array of conductors connecting at least one of the layers of periodic conductive patches to the ground plane. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58)
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59. A multi-band artificial magnetic conductor (AMC) comprising:
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a ground plane;
a plurality of frequency selective surface (FSS) layers, each FSS layers having periodic conductive patches;
a first dielectric layer separating each of the FSS layers;
a second dielectric layer separating the ground plane from one of the FSS layers; and
an array of vertical conductors connecting at least some of the conductive patches on at least two of the FSS layers to the ground plane. - View Dependent Claims (60, 61, 62)
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Specification