What is the radiation pattern of patch antenna?
The radiation pattern of microstrip or patch antenna is broad. It has low radiation power and narrow frequency bandwidth.
How do you increase the radiation efficiency of a patch antenna?
You can apply reflecting surfaces, active component, EBG structure or slot matching etc to improve radiation efficiency.
What are the advantages and disadvantages of the patch antenna?
The advantage is that it eliminates feed radiation and provides high bandwidth. The disadvantage is that it is difficult to fabricate because of the two dielectric layers which need proper alignment[6]. The micro strip patch antennas are famous for their performance and robust design.
How many types of patch antenna are there?
The commonly available shapes of patch antenna are rectangular, circular, dipole, triangular, square and elliptical with rectangular and circular shapes the most common.
What are the limitations of microstrip antenna?
Disadvantages of microstrip antenna:
- It offers a lower gain.
- Narrow bandwidth associated with a tolerance problem.
- It excitation of surface waves.
- Large ohmic losses in feed structure of arrays.
- Most of the microstrip antenna radiates into half-space.
- It has a lower power handling capability.
Where can a patch antenna be used?
The patch antenna is mainly practical at microwave frequencies, at which wavelengths are short enough that the patches are conveniently small. It is widely used in portable wireless devices because of the ease of fabricating it on printed circuit boards.
What is the gain of a patch antenna?
Usually we know patch antenna typical gain 6-7 dBi. This can increase by ground plane extention, feed method, ground plane modification, patch modification. Usual method to increase gain by patch antenna is antenna array form or by horn antenna, aperture antenna.
What is the gain of patch antenna?
A single patch antenna provides a maximum directive gain of around 6-9 dBi. It is relatively easy to print an array of patches on a single (large) substrate using lithographic techniques.
What are the drawbacks of patch antennas?
Disadvantages of Micro-strip Patch antennas
- Micro-strip patch antennas suffer from more drawbacks as compared to conventional antennas.
- Bandwidth is narrow.
- Efficiency is low.
- Low Gain.
- Extraneous radiation from feeds and junctions.
- Poor end fire radiator except tapered slot antennas.
- Low power handling capacity.