Antenna having planar conducting elements, one of which has a plurality of electromagnetic radiators and an open slot
An antenna includes a dielectric material having i) a first side opposite a second side, and ii) a conductive via therein. A first planar conducting element is on the first side of the dielectric material and has an electrical connection to the conductive via. A second planar conducting element is also on the first side of the dielectric material. A gap electrically isolates the first and second planar conducting elements from each other. An electrical microstrip feed line on the second side of the dielectric material electrically connects to the conductive via and has a route that extends from the conductive via, to across the gap, to under the second planar conducting element. The first planar conducting element has a plurality of electromagnetic radiators, each having dimensions that cause it to resonate over a range of frequencies that differs from a range of frequencies over which an adjacent radiator resonates. At least first and second of the radiators bound an open slot in the first planar conducting element. The open slot has an orientation perpendicular to the gap.
1. An antenna, comprising:
a dielectric material having i) a first side opposite a second side, and ii) a conductive via therein;
a first planar conducting element on the first side of the dielectric material, the first planar conducting element having an electrical connection to the conductive via;
a second planar conducting element on the first side of the dielectric material, wherein the first and second planar conducting elements are separated by a gap that electrically isolates the first planar conducting element from the second planar conducting element; and
an electrical microstrip feed line on the second side of the dielectric material, the electrical microstrip feed line electrically connected to the conductive via and having a route extending from the conductive via, to across the gap, to under the second planar conducting element, the route changing direction under the second planar conducting element on the second side of the dielectric material, the second planar conducting element providing a reference plane for both the electrical microstrip feed line and the first planar conducting element;
wherein the first planar conducting element has a plurality of electromagnetic radiators, each radiator having dimensions that cause it to resonate over a range of frequencies that differs from a range of frequencies over which an adjacent radiator resonates, and at least first and second of the radiators bounding an open slot in the first planar conducting element, wherein the slot has an orientation perpendicular to the gap.
2. The antenna of claim 1 , wherein each radiator has a length and a width, the lengths of the radiators having orientations perpendicular to the gap.
3. The antenna of claim 1 , wherein a third of the radiators abuts the second of the radiators.
4. The antenna of claim 3 , wherein the length of the second radiator is greater than the length of the first radiator, and wherein the length of the third radiator is greater than the length of the second radiator.
5. The antenna of claim 1 , wherein the first planar conducting element electrically connects to the conductive via between the open slot and the gap.
6. The antenna of claim 1 , wherein the first planar conducting element has a third radiator.
7. The antenna of claim 1 , wherein the second planar conducting element has a rectangular perimeter.
8. The antenna of claim 1 , wherein each of the radiators has a rectangular shape.
9. The antenna of claim 1 , wherein the dielectric material comprises FR4.
10. The antenna of claim 1 , wherein the second planar conducting element has a hole therein, and the dielectric material has a hole therein, the hole in the second planar conducting element and the hole in the dielectric material being aligned.
11. The antenna of claim 10 , further comprising a coax cable having a center conductor, a conductive sheath, and a dielectric separating the center conductor from the conductive sheath, wherein the center conductor extends through the hole in the second planar conducting element and the hole in the dielectric material, wherein the center conductor is electrically connected to the electrical microstrip feed line, and wherein the conductive sheath is electrically connected to the second planar conducting element.
12. The antenna of claim 11 , wherein:
the antenna has a length extending from the first planar conducting element to the second planar conducting element, the length crossing the gap;
the antenna has a width perpendicular to the length; and
the coax cable follows a route that is parallel to the width of the antenna, the coax cable being urged along the route by the electrical connection of the conductive sheath to the second planar conducting element.
13. The antenna of claim 1 , wherein:
the antenna has a length extending from the first planar conducting element to the second planar conducting element, the length crossing the gap;
the antenna has a width perpendicular to the length; and
the route of the electrical microstrip feed line crosses the gap parallel to said length, then changes direction and extends parallel to said width.
14. The antenna of claim 1 , wherein:
the dielectric material has a plurality of conductive vias therein, of which the conductive via is one, and wherein each of the plurality of conductive vias is positioned proximate to others of the conductive vias at a connection site; and
each of the electrical microstrip feed line and the first planar conducting element is electrically connected to each of the plurality of conductive vias.
15. The antenna of claim 1 , further comprising a radio on the dielectric material, wherein the electrical microstrip feed line is electrically connected to the radio.
16. The antenna of claim 15 , wherein the radio is on the second side of the dielectric material.
17. The antenna of claim 15 , wherein the radio comprises an integrated circuit.
18. An antenna, comprising:
a dielectric material having i) a first side opposite a second side, and ii) a conductive via therein;
a first planar conducting element on the first side of the dielectric material, the first planar conducting element having an electrical connection to the conductive via;
a second planar conducting element on the first side of the dielectric material, wherein the first and second planar conducting elements are separated by a gap that electrically isolates the first planar conducting element from the second planar conducting element; and
an electrical microstrip feed line on the second side of the dielectric material, the electrical microstrip feed line electrically connected to the conductive via and having a route extending from the conductive via, to across the gap, to under the second planar conducting element, the second planar conducting element providing a reference plane for both the electrical microstrip feed line and the first planar conducting element;
wherein the first planar conducting element has a plurality of electromagnetic radiators, each radiator having dimensions that cause it to resonate over a range of frequencies that differs from a range of frequencies over which an adjacent radiator resonates, and at least first and second of the radiators bounding an open slot in the first planar conducting element, wherein the open slot has an orientation perpendicular to the gap;
wherein the second planar conducting element has a hole therein, and the dielectric material has a hole therein, the hole in the second planar conducting element and the hole in the dielectric material being aligned; and
wherein the hole in the second planar conducting element is larger than the hole in the dielectric material, thereby exposing the first side of the dielectric material adjacent the hole in the dielectric material.