Antenna with polarization diversity
A horizontally polarized antenna array allows for the efficient distribution of RF energy into a communications environment through selectable antenna elements and redirectors that create a particular radiation pattern such as a substantially omnidirectional radiation pattern. In conjunction with a vertically polarized array, a particular high-gain wireless environment may be created such that one environment does not interfere with other nearby wireless environments and avoids interference created by those other environments. Lower gain patterns may also be created by using particular configurations of a horizontal and/or vertical antenna array. In a preferred embodiment, the antenna systems disclosed herein are utilized in a multiple-input, multiple-output (MIMO) wireless environment.
1. A multiple-input, multiple-output (MIMO) antenna system, comprising:
at least one horizontally polarized antenna array including a plurality of antenna elements selectively coupled to a radio frequency feed port; and
a vertically polarized antenna array coupled to the at least one horizontally polarized antenna array by a printed circuit board connector element, wherein each of the at least one horizontally polarized antenna array and vertically polarized antenna array is physically coupled to a dedicated and different radio.
2. The MIMO antenna system of claim 1 , wherein the vertically polarized antenna array generates a radiation pattern substantially perpendicular to a radiation pattern generated by the at least one horizontally polarized antenna arrays.
3. The MIMO antenna system of claim 1 , wherein the vertically polarized antenna array generates a radiation pattern substantially similar to a radiation pattern generated by the at least one horizontally polarized antenna array.
4. The MIMO antenna system of claim 1 , wherein the vertically polarized antenna array generates a radiation pattern substantially dissimilar to a radiation pattern generated by the at least one horizontally polarized antenna array.
5. The MIMO antenna system of claim 1 , wherein a substantially omnidirectional radiation pattern substantially in the plane of the at least one horizontally polarized antenna array is generated when a first antenna element and a second antenna element of the plurality of antenna elements are coupled to the radio frequency feed port.
6. The MIMO antenna system of claim 1 , wherein at least one of the plurality of antenna elements includes a loading structure configured to slow down elections and change the resonance of the ate least one of the plurality of antenna elements.
7. The MIMO antenna system of claim 1 , wherein the plurality of antenna elements on the at least one horizontally polarized antenna array are oriented substantially to the edges of a square shaped substrate.
8. The MIMO antenna system of claim 1 , wherein the plurality of antenna elements on the at least one horizontally polarized antenna array are oriented substantially to the middle of the square shaped substrate.
9. The MIMO antenna system of claim 1 , wherein the plurality of the antenna elements on the at least one horizontally polarized antenna array are oriented substantially to the edges of a triangular shaped substrate.
10. The MIMO antenna system of claim 1 , wherein the plurality of antenna elements on the at least one horizontally polarized antenna array are oriented substantially to the middle of a triangular shaped substrate.
11. The MIMO antenna system of claim 1 , wherein the radio frequency feed port is selectively coupled to at least one of the plurality of antenna elements by an antenna element selector.
12. The MIMO antenna system of claim 11 , wherein the antenna element selector comprises an RF switch.
13. The MIMO antenna system of claim 11 , wherein the antenna element selector comprises a diode.
14. The MIMO antenna system of claim 5 , further comprising at least one reflector or director that influences the radiation pattern of the first antenna element and the second antenna element coupled to the radio frequency feed port.
15. The MIMO antenna system of claim 13 , wherein the diode is a PIN diode.
16. The MIMO antenna system of claim 1 , wherein a connector tab on the printed circuit board connector element is soldered to the at least one horizontally polarized array at the rectangular slit formed within the printed circuit board of the at least one horizontally polarized antenna array.
17. The MIMO antenna system of claim 16 , wherein the printed circuit board connector element is also soldered to the vertically polarized antenna array at a connector tab.