Antenna with dual polarization and mountable antenna elements
A wireless device having a mountable antenna element and an antenna array that operate simultaneously and efficiently on a circuit board within a wireless device. The mountable antenna element may be coupled to a ground layer of the circuit board. The antenna array may include dipole antennas incorporated within the circuit board and positioned within a close proximity to the ground layer. One or more stubs may be implemented on the circuit board near the dipole antenna array. Each antenna stub may create an impedance in the dipole elements which enable the antenna elements to operate efficiently while positioned in close proximity to the circuit board ground layer.
1. A wireless device for transmitting an 802.11 compliant radiation signal, comprising:
a circuit board;
a mountable antenna element mounted to a surface of the circuit-board;
a ground layer disposed within the circuit board and coupled to the mountable antenna element;
a stub coupled to the ground layer;
an antenna array including a plurality of antenna elements embedded in the circuit board proximate to the ground layer, wherein an impedance generated by the stub associated near the plurality of embedded antenna elements is sufficient to counteract any terminating effect of the proximate ground layer; and
a radio modulator/demodulator that provides an 802.11 radio frequency (RF) signal to the mountable antenna element and one or more embedded antenna elements of the plurality of embedded antenna elements, wherein the mountable antenna element and the one or more embedded antenna elements operate concurrently in both the 2.4 Ghz and 5.0 Ghz bands.
2. The wireless device of claim 1 , wherein the stub is positioned proximate to the plurality of embedded antenna elements.
3. The wireless device of claim 2 , wherein the stub is implemented as a portion of the ground layer.
4. The wireless device of claim 2 , wherein the stub has a length of about one quarter of the wavelength of the radiation frequency of the plurality of embedded antenna elements.
5. The wireless device of claim 1 , wherein the circuit board is coupled to the mountable antenna element through a plurality of legs and an RF feed of the mountable antenna element.
6. The wireless device of claim 1 , wherein the mountable antenna element generates a radiation pattern having a polarization perpendicular to the plane of the circuit board.
7. The wireless device of claim 1 , wherein the one or more embedded antenna elements generate a radiation pattern having a polarization in the plane of the circuit board.
8. The wireless device of claim 1 , further comprising a reflector disposed proximate the mountable antenna element that reflects a radiation pattern of the mountable antenna element.
9. The wireless device of claim 8 , wherein the reflector is coupled to the circuit board.
10. The wireless device of claim 9 , wherein the reflector is coupled to the circuit board through a mounting plate.
11. The wireless device of claim 10 , wherein the reflector is flat and approximately “T” shaped.
12. The wireless device of claim 1 , wherein the circuit board provides the mountable antenna element and the one or more embedded antenna elements with the RF signal for simultaneous radiation.
13. A wireless device for transmitting an 802.11 compliant radiation signal, comprising:
communication circuitry located within a circuit board, the communication circuitry generating an 802.11 radio frequency (RF) signal;
a mountable antenna element;
a ground layer disposed within the circuit board and coupled to the mountable antenna element;
a stub coupled to the ground layer
an antenna array including a plurality of embedded antenna elements, wherein the plurality of embedded antenna elements are disposed proximate to the edges of the circuit board and proximate to the ground layer, wherein an impedance generated by the stub associated near each of the plurality of embedded antenna elements is sufficient to counteract any terminating effect of the proximate ground layer and forming a radiation pattern when coupled to the communication circuitry; and
a switching network that selectively couples one or more embedded antenna elements of the plurality of embedded antenna elements and the mountable antenna element to the communication circuitry, wherein the mountable antenna element and the one or more embedded antenna elements operate concurrently in the 2.4 GHz and 5.0 GHz bands.
14. The wireless device of claim 13 , wherein the stub is positioned proximate to the plurality of embedded antenna elements.
15. The wireless device of claim 14 , wherein the stub is implemented as a portion of the ground layer.
16. The wireless device of claim 14 , wherein the stub has a length of about one quarter of the wavelength of the generated RF signal.
17. The wireless device of claim 13 , further comprising a reflector disposed proximate to the mountable antenna element to reflect a radiation pattern of the mountable antenna element.
18. The wireless device of claim 17 , wherein the reflector is coupled to the circuit board.
19. The wireless device of claim 18 , wherein the reflector is coupled to the circuit board through a mounting plate.
20. The wireless device of claim 19 , wherein the reflector is flat and approximately “T” shaped.