Hello,

For designing an array of microstrip patch antennas you can follow these steps.

1. First of all design a single patch element resonating in the required frequency band of interest.

2. Then choose the feed type, either corporate feed or power divider/splitters can be used. (Do the literature studies to get the idea about the network feed types and mictostrip antenna arrays).

3. Then you can design 2-patch antenna array with the spacing of 1/2 wavelength using the appropriate feeding technique.

4. Later you can simulate and see the results for 4-path or 8-patch array accordingly.

1) design the single antenna/element. Study the performance. Optimize the simulation until obtain roughly what u want

2) with the use of feeding network, and proper impedance matching, use that single antenna and construct an array. Optimize untill you get the result u want, gain, radiation, etc

Thanx Arslan sir.....& Raimi sir. Can u provide any online link where i can study designing of feed network?

For feeding networks you can refer ANTENNA THEORY- ANALYSIS AND DESIGN by Balanis. The feeding network requires impedance tranformers too.

You are welcome. Well you can see the description about array feeding techniques in the following video:

http://www.youtube.com/watch?v=-8QZLWbF9nw

However in order to fully understand the working and analyze the results you have to find research papers from IEEE Explore or from any other recognized journals.

Thanx all......

All the best.