Antenna with high K backing material
View Patent ↗An antenna is disclosed. The antenna may have a slotted conductive reference sheet, a first dielectric material and a second dielectric material. The first dielectric material may reside on a first side of the reference sheet, and the second dielectric material may reside on the second side of the reference sheet. The first dielectric material has a first K-value, and the second dielectric material has a second K-value. The second K-value is larger than the first K-value.
1. An antenna, comprising:
a conductive reference sheet having a substantially spiral-shaped slot therein, the reference sheet having a first primary surface and a second primary surface;
a first dielectric material residing on a first side of the reference sheet, the first side being that which includes a surface-normal of the first primary surface, the first dielectric material having a first K-value;
a second dielectric material residing on a second side of the reference sheet, the second side being that which includes a surface-normal of the second primary surface, the second dielectric material having a second K-value, the second K-value being larger than the first K-value; and
a grounding structure electrically coupled to the reference sheet.
2. The antenna of claim 1 , wherein the first dielectric material resides in the slot.
3. The antenna of claim 1 , wherein the first K-value is not greater than one-fourth of the second K-value.
4. The antenna of claim 1 , further comprising air in the slot.
5. The antenna of claim 1 , wherein the first dielectric material is a polymer.
6. The antenna of claim 1 , wherein the first dielectric material is air.
7. The antenna of claim 1 , wherein the second dielectric material is alumina.
8. The antenna of claim 1 , wherein the second dielectric material is magnesium titanate.
9. The antenna of claim 1 , wherein the second dielectric material is barium titanate.
10. The antenna of claim 1 , wherein the reference sheet is fixed to one of the dielectric materials.
11. The antenna of claim 1 , further comprising a signal feed structure in communication with the reference sheet.
12. The antenna of claim 1 , wherein the slot is substantially an Archimedean spiral.
13. The antenna of claim 1 , further comprising a ground conductor in communication with the reference sheet.
14. The antenna of claim 13 , further comprising a conductive grounding structure in communication with the ground conductor.
15. The antenna of claim 14 , wherein the second dielectric material resides between the reference sheet and the grounding structure.
16. The antenna of claim 1 , wherein the second dielectric material contacts the second primary surface.
17. The antenna of claim 1 , wherein the first dielectric material contacts the first primary surface.
18. The antenna of claim 1 , wherein the reference sheet is substantially planar.