high gain 2.45ghz antenna

does any one here have any design of antenna that have high gain, which is more than 2dB? i need it for my fyp. i've done lot of design but apparently it didnt give high gain. and if it high gain, it doesnt detect for 2.45ghz. maybe anyone here can help me. tq

Hello,

2 dB (I assume 2 dBi) is not considered high gain. A simple half wave dipole has about 2 dBi of gain, a home brew biquad has even more. As WIFI is very popular, there are many do-it-yourself designs on the web as well as professional designs. Search the web and come back with specific questions so the we can really help you.

At any frequency like 2.45 GHz, combining dipole elements into an array can offer a higher gain. Similarly, Yagi antennas , helicals and finally parabolic dishes offer gains exceeding 16-20 dB.
Antenna gain means a higher directivity, or, a narrower beam of the radiating pattern. High-gain antenna must be carefully pointed to the opposite antenna in a radio link. Space around and in front of such antenna must be free, no obstacles, and a direct line of sight is needed to fully use the gain.

actually i have found this antenna. but i dont really understand bout this antenna. it said it use GA. and it is yagi antenna. what is GA? i try to read about it but cant understand detail bout it.

Try to find the ARRL Antenna Book od ARRL Radio Amateurs Handbook. You will find answers there, without too much of theory.

a simple dipole or bowtie in planner type and i think all common microstrip has more than this gain

I did a similar project for a WiFi antenna (2.44Ghz) made using 4Nec2 Antenna simulator. You can find the design here: http://pastebin.com/4SdsWV1D

Good luck