Microstrip patch antenna using MEMS technology

1. A microstrip patch antenna comprising:

a substrate provided with a ground formed on a bottom surface of the substrate;

a feeding line formed on a top surface of the substrate for feeding an electric power;

a coupling stub formed on the top surface of the substrate and electrically connected to the feeding line;

a plurality of supporting posts erected on the top surface of the substrate; and

a radiating patch formed on the supporting posts, thereby forming an area of air between the radiating patch and the top surface of the substrate.

2. The microstrip patch antenna of claim 1 , wherein the plurality of supporting posts is arranged in such a way that they do not disturb a dominant mode of a radio frequency emitted from the radiating patch.

3. The microstrip patch antenna of claim 2 , wherein the plurality of supporting posts are made of metal.

4. The microstrip patch antenna of claim 1 , wherein the radiating patch is rectangular.

5. The microstrip patch antenna of claim 1 , wherein the plurality of supporting posts is placed within the distance from a radiating edge of the radiating patch.

6. The microstrip patch antenna of claim 1 , further comprising:

a metal strip formed on the top surface of the substrate electrically connected to one of the supporting posts;

at least one switch formed on the metal strip; and

at least one electric line connected to the switch.

7. The microstrip patch antenna of claim 6 , wherein the one connected supporting post is connected to a radiating edge of the radiating patch.

8. The microstrip patch antenna of claim 6 , wherein the at least one switch is formed by using a microelectro-mechanical system (MEMS).

9. The microstrip patch antenna of claim 6 , wherein a resonance length of the antenna is controlled by turning on and off at least one of the at least one switches.

10. The microstrip patch antenna of claim 1 , wherein substrate is made of a silicon wafer having a high dielectric constant.

11. A microstrip patch antenna for controlling a resonance length thereof, comprising:

a substrate provided with a ground;

a first metal pattern formed on a first portion of the substrate;

means for radiating a radio frequency signal;

means for supporting the radiating means; and

a second metal pattern formed on a second portion of the substrate wherein the resonance length is controlled by electrically switching the second metal pattern.

12. The microstrip patch antenna of claim 11 , further comprising a switch formed on the second metal pattern.