Planar antenna
First Claim
1. An antenna comprising a lamina of conductive material, a slot loop being formed in the lamina, the antenna being operable in at least one resonant operational modes in which at least one portion of the slot loop is associated with an relatively high electromagnetic field and in which at least one other portion of the slot loop is associated with a relatively low or substantially zero electromagnetic field, wherein the lamina is folded on itself so that said at least one portion of the slot loop lies in a first plane and said at least one other portion of the slot loop lies in a second plane, the second plane being substantially parallel with the first plane, and wherein said antenna comprises a first and a second end region, and a central region located between the first and second end regions, each region comprising a respective portion of the lamina, and wherein said central region is located in said first plane and at least part of one or both of said end regions are located in said second plane, and wherein the central region includes at least two spaced apart portions of said slot loop and each end region includes a respective portion of said slot loop.
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Accused Products
Abstract
An antenna comprising a lamina of conductive material, the antenna being operable in one or more resonant operational modes in which at least one portion of the antenna is associated with an relatively high electromagnetic field and in which at least one other portion of the antenna is associated with a relatively low or substantially no electromagnetic field. The lamina is folded on itself so that said at least one portion of the antenna lies on an obverse face of the antenna and said at least one other portion of the antenna lies on the reverse face of the antenna. In one embodiment, the antenna is a slot-loop antenna. In a second embodiment, the antenna acts as a quarter wave monopole.
32 Citations
20 Claims
- 1. An antenna comprising a lamina of conductive material, a slot loop being formed in the lamina, the antenna being operable in at least one resonant operational modes in which at least one portion of the slot loop is associated with an relatively high electromagnetic field and in which at least one other portion of the slot loop is associated with a relatively low or substantially zero electromagnetic field, wherein the lamina is folded on itself so that said at least one portion of the slot loop lies in a first plane and said at least one other portion of the slot loop lies in a second plane, the second plane being substantially parallel with the first plane, and wherein said antenna comprises a first and a second end region, and a central region located between the first and second end regions, each region comprising a respective portion of the lamina, and wherein said central region is located in said first plane and at least part of one or both of said end regions are located in said second plane, and wherein the central region includes at least two spaced apart portions of said slot loop and each end region includes a respective portion of said slot loop.
- 12. An antenna comprising a lamina of conductive material, and a layer of conductive material which provides said lamina and which is shaped to define a slot loop around said lamina the antenna being operable in at least one resonant operational mode in which at least one portion of the antenna is associated with an relatively high electromagnetic field and in which at least one other portion of the antenna is associated with a relatively low or substantially zero electromagnetic field, wherein the lamina is folded on itself so that said at least one portion of the antenna lies in a first plane and said at least one other portion of the antenna lies in a second plane, the second plane being substantially parallel with the first plane, and wherein said at least one other portion is folded with respect to said at least one portion such that, in said at least one resonant operational mode, there is substantially no destructive electromagnetic interference between the respective electromagnetic near-fields generated by said antenna portions, the antenna being operable in one or more resonant operational modes in which at least one portion of said slot loop is associated with a relatively high electromagnetic field and in which at least one other portion of said slot loop is associated with a relatively low or substantially no electromagnetic field, wherein the conductive layer is folded on itself so that said at least one portion of said slot loop lies in said first plane and said at least one other portion of said slot loop lies in said second plane.
Specification