Micro strip antennas are low-profile antennas. A metal patch mounted at a ground level with a di-electric material in-between constitutes a Micro strip or Patch Antenna. These are very low size antennas having low radiation.
The patch antennas are popular for low profile applications at frequencies above 100MHz.
CONSTRUCTION AND WORKING OF MICRO STRIP ANTENNA:
Micro strip antenna consists of a really thin metallic strip placed on a ground plane with a di-electric material in-between. The radiating element and feed lines are placed by the method of photo-etching on the di-electric material. Usually, the patch or micro-strip is chosen to be square, circular or rectangular in shape for the benefit of research and fabrication. The subsequent image shows a micro-strip or patch antenna.
The length of the metal patch is λ/2. When the antenna is happy, the waves generated within the di-electric undergo reflections and also the energy is radiated from the perimeters of the metal patch, which is incredibly low.
The graph of microstrip or patch antenna is broad. It’s low radiation power and narrow frequency bandwidth.
The Radiation Pattern of a microstrip or patch antenna is shown above. It has less directivity. To possess a greater directivity, an array may be formed by using these patch antennas.
The following are the benefits of Micro strip antenna:
ii) Low cost.
iii) Ease of installation.
The following are the disadvantages of Micro strip antenna:
i) Inefficient radiation.
ii) Narrow frequency bandwidth.
The following are the applications of Micro strip antenna:
i) Used in Spacecraft applications.
ii) Used in Aircraft applications.
iii) Used in Low profile antenna applications.