Printed monopole smart antenna for WLAN AP/router

1. A smart antenna, comprising:

a monopole antenna having a reverse triangle plane for receiving and transmitting a signal;

a first conductor with a first switch diode disposed on a first side of the monopole antenna and electrically connected to a ground, for conducting one of actions of directing the signal and reflecting the signal to the monopole antenna;

a second conductor with a second switch diode disposed on a second side of the monopole antenna and electrically connected to the ground, for conducting one of actions of directing the signal and reflecting the signal to the monopole antenna;

a circuit device electrically connected between the first conductor and the second conductor, for turning on/off the first switch diode and the second switch diode; and

at least one groove disposed in the ground and horizontal with the ground, for concentrating a current of the signal received from/transmitted to the monopole antenna,

wherein the smart antenna switches among four patterns formed by selectively turning on/off the first switch diode and the second switch diode.

2. The smart antenna according to claim 1 , wherein the reverse triangle plane has a first edge and a second edge, where each of the first edge and the second edge has at least one cutout, and a third edge parallel to the ground, and a distance between every two neighboring cutouts is constant.

3. The smart antenna according to claim 2 , wherein each of the first edge and the second edge has at least two cutouts on the plane, and a distance between every two neighboring cutouts is constant.

4. The smart antenna according to claim 2 , wherein the cutout has a length increased with a decrease of a length of the third edge.

5. The smart antenna according to claim 1 , wherein the at least one groove is disposed perpendicular to the monopole antenna, the first conductor and the second conductor.

6. A smart antenna, comprising:

a monopole antenna having a plane with at least three edges including a first, a second and a third edges, where each of the first edge and the second edge has at least one cutout on the plane and the third edge is parallel to the around, the plane being for receiving and transmitting a signal;

a first conductor for conducting one of actions of directing the signal and reflecting the signal to the monopole antenna;

a second conductor for conducting one of actions of directing the signal and reflecting the signal to the monopole antenna; and

a circuit device electrically connected between the first conductor and the second conductor, for selectively switching the first and second conductors to determine an operation mode of the smart antenna.

7. The smart antenna according to claim 6 , wherein the first conductor with a first switch diode and the second conductor with a second switch diode respectively are disposed on a first side and a second side along the monopole antenna and electrically connected to a ground, and the smart antenna switches among four patterns formed by turning on/off the first switch diode and the second switch diode.

8. The smart antenna according to claim 6 , wherein the monopole antenna further comprises a feeding point being a signal input port.

9. The smart antenna according to claim 6 , wherein each of the first edge and the second edge has at least two cutouts on the plane, and a distance between every adjacent two neighboring cutouts is constant.

10. The smart antenna according to claim 6 , wherein the monopole antenna has a length equal to a half of a wavelength of the signal.

11. The smart antenna according to claim 6 , wherein the first conductor and the second conductor have a length equal to 0.1˜0.5 times of a wavelength of the signal.

12. The smart antenna according to claim 6 , wherein the monopole antenna and the first conductor have a first distance therebetween equal to 0.1˜0.5 times of a wavelength of the signal, and the monopole antenna and the second conductor have a second distance therebetween equal to 0.1 ˜0.5 times of the wavelength of the signal.

13. The smart antenna according to claim 6 , wherein the first conductor further comprises a first inductance, the second conductor further comprises a second inductance, and the first inductance and the second inductance are electrically connected to the circuit device for being blocked at a high frequency.

14. The smart antenna according to claim 6 , wherein one third part of the first conductor and one third part of the second conductor are overlapped with the ground, and terminals of the first conductor and the second conductor are electrically connected to the ground.

15. The smart antenna according to claim 6 , wherein each of the first conductor and the second conductor is one of a rectangle shape and a reverse L-shape.

16. The smart antenna according to claim 6 , wherein the monopole antenna, the first conductor and the second conductor are made of a metal material.

17. The smart antenna according to claim 6 , wherein the second conductor is opposite to the first conductor.

18. An operation method for a smart antenna, wherein the smart antenna comprises a monopole antenna having a reverse triangle plane, a first conductor, a second conductor, a circuit device, and a ground having at least one groove disposed in the ground and horizontal with the ground, the first conductor comprises a first switch diode, and the second conductor comprises a second switch diode, the operation method comprising a step of:

controlling the circuit device via turning on/off the first switch diode and turning on/off the second switch diode simultaneously, so as to switch among a plurality of operation modes of the smart antenna.

19. The operation method according to claim 18 , wherein a sequence of a first, a second, a third, and a fourth antenna patterns is randomly arranged.