Radiation Efficiency improvement for miniaturized slot antenna

[pramodh.madhuranath]

Hi,

I am working on a project to design the slot antenna with size 20*20mm. I have design antenna which resonates at 2.4GHz with good return loss -15Db and has a wide bandwidth of 500Mhz. But the problem is the efficiency. It's efficiency is around 40%.
Could you please different methods for to enhance the radiation efficiency.

I hve attached the cst file.

Thanks for the help.

 

[chuckey]

Wow ! 20 X 20 mm, that's not a slot its a hole. According to my limited theory, slot says it all, good conductivity surrounding the narrow slot. Has you aerial a very wide bandwidth?, do you need it?
Frank

 

[volker@muehlhaus]

Low radiation efficiency results from losses (dissipation). In simulation, you can selectively make only the conductors lossless, and then make only the dielectric lossless, to find the critical parameter.

 

[FvM]

Just in case I would ask if the OP is actually measuring radiation efficiency or the measured "efficiency" might include mismatch losses.