Planar antenna
A planar antenna can include one or more high permeability objects that are added near the planar coil's tips. Further, the planar antenna includes a coil having two or more layers, with each layer having two or more turns. The planar antenna also has a restricted conductor arrangement, where there are a maximum number of turns arranged in any horizontal layer. A turn's conductor could be a single conductor or could be two (2) or more conductors arranged in parallel.
1. A planar antenna, comprising:
a coil comprising:
a first turn in a first layer; and
a first tip; and
a first high permeability object positioned in proximity to the first tip, wherein the first high permeability object is a single piece object including a first section, a second section, and a third section between the first section and the second section, wherein the third section is recessed from the first second section and the second section and accommodates the coil, wherein the first section encircles the coil, wherein the second section is encircled by the coil, wherein the first turn includes two or more conductors electrically connected in parallel and in a same plane within the first layer, wherein the second section comprises a side wall having a first point and a second point that is opposite the first point, and wherein the second section comprises an uninterrupted top surface that spans over an entire top of the second section from the first point to the second point.
2. The planar antenna of claim 1 , wherein the coil further comprises a second layer.
3. The planar antenna of claim 2 , wherein the first layer includes a second turn.
4. The planar antenna of claim 1 , wherein the coil includes a void at a center of the coil.
5. The planar antenna of claim 4 , wherein the second section occupies the void.
6. The planar antenna of claim 3 , wherein the second turn includes two or more conductors electrically connected in parallel and in a same plane within the first layer.
7. The planar antenna of claim 6 , wherein the first layer includes fewer turns than the second layer.
8. The planar antenna of claim 6 , wherein the second layer has fewer turns than the first layer.
9. The planar antenna of claim 6 , wherein each of the first layer and the second layer has three or fewer turns.
10. The planar antenna of claim 1 , wherein the first high permeability object is made from one or more of ferrite, silicon-steel, amorphous steel, and/or soft steel.
11. The planar antenna of claim 10 , wherein the planar antenna is of rectangular shape.
12. The planar antenna of claim 11 , wherein a maximum number of turns in the first layer is determined by the ceiling function:
ceil
=
(
m
n
)
.
where m represents a total number of turns and n represents a total number of layers.
13. The planar antenna of claim 1 , wherein the side wall and the uninterrupted top surface of the second section form a cylinder shape that protrudes from the third section.