Radio frequency emission pattern shaping
Pattern shaping elements shape a radiation pattern generated by one or more antennas. A MIMO antenna system generates an omnidirectional radiation pattern. One or more pattern shaping elements may include metal objects which act as directors or reflectors to shape the radiation pattern. The shaping may be controlled by selectively coupling the pattern shaping elements to a ground plane, thus making them appear transparent to the radiation pattern. The pattern shaping elements may be amorphous, have varying shape, and may be symmetrical or asymmetrical. Different configurations of selected pattern shaping elements may provide different shapes for a radiation pattern.
1. A wireless device, comprising:
two or more radios operating in parallel, wherein the two or more radios generate RF signals having a same center frequency and bandwidth;
a switching network that selectively couples the generated RF signals from the two or more radios to an antenna array;
an antenna array that generates a substantially omnidirectional radiation pattern, wherein the antenna array includes a plurality of selectable horizontally polarized antenna elements and a plurality of selectable vertically polarized antenna elements, the plurality of selectable antenna elements each having a corresponding radiation pattern;
a first plurality of connecting elements, each of the first plurality of connecting elements selecting one or more of the plurality of antenna elements by coupling one or more of the plurality of antenna elements to one or more of said radios;
a plurality of pattern shaping elements, wherein each of the plurality of a pattern shaping elements have a different shape;
a second plurality of connecting elements, each of the second plurality of connecting elements coupling one or more of the plurality of pattern shaping elements to ground; and
a controller that switches one or more of the second plurality of connecting elements to utilize a pattern shaping element with a particular shape and switches one or more of the first plurality of connecting elements, wherein utilization of the pattern shaping element with the particular shape and selection of one or more of the plurality of antenna elements by respective one of the first plurality of connecting elements change the substantially omnidirectional radiation pattern generated by the antenna array and wherein one or more of the selectable horizontally polarized antenna elements have a barrel-type shape with a slit.
2. The wireless device of claim 1 , wherein the plurality of a pattern shaping elements includes a director.
3. The wireless device of claim 1 , wherein the plurality of a pattern shaping elements includes a reflector.
4. The wireless device of claim 1 , wherein one or more of the plurality of connecting elements are mounted on an outer surface of a printed circuit board.
5. The wireless device of claim 1 , wherein each of the plurality of connecting elements includes a tab, the tab extending into a printed circuit board.
6. The wireless device of claim 1 , wherein the antenna array comprises a horizontal antenna array, and wherein the substantially omnidirectional radiation pattern is substantially in a plane of the horizontal antenna array.
7. The wireless device of claim 1 , wherein two or more of the plurality of antenna elements are selectively coupled to a radio frequency feed port to generate a substantially omnidirectional radiation pattern.
8. The wireless device of claim 1 , wherein the controller selects a configuration of one or more of the plurality of antenna elements to generate a substantially omnidirectional radiation pattern, wherein the substantially omnidirectional radiation pattern changes based on the selected configuration.
9. The wireless device of claim 1 , wherein one or more pattern shaping elements of the plurality of a pattern shaping elements differ in height and width from other pattern shaping elements of the plurality of pattern shaping elements.
10. The wireless device of claim 1 , wherein the plurality of pattern shaping elements includes one or more pattern shaping elements that have symmetrical shapes and one or more pattern shaping elements that have asymmetrical shapes.
11. The wireless device of claim 1 , wherein each of the plurality of pattern shaping elements has a non-symmetrical shape with respect to a vertical axis through a center of the respective pattern shaping element.
12. The wireless device of claim 1 , wherein at least one of the selectable horizontally polarized antenna elements comprises:
a first antenna member and a second antenna member connected at an RF feed point,
tabs associated with a lower portion of each of the first and second antenna members, and
shoulders associated with the lower portion of each of the first and second antenna members, the shoulders maintaining a spacing for each of the lower portion of the first and second antenna members above a printed circuit board to which the horizontally polarized antenna element is mounted to.
13. The wireless device of claim 1 , wherein at least one of the selectable the vertically polarized antenna elements comprises:
a first antenna member and a second antenna member connected at an RF feed point,
finger elements at each of the ends of the antenna members, the finger elements of the second antenna member forming a magnetic pair with the finger elements of the first antenna member,
tabs, and
shoulders, wherein the tabs and the shoulders mount the vertically polarized antenna element on the printed circuit board.