Hello,
I am working with a broadband Perfect electric conductor (PEC) foil antenna (characteristics of dipole, i mean no ground plane) as seen in Fig. I simulated my antenna model using an antenna solver and also measured it, but the interesting point is, there is a huge difference in resonance frequencies between simulations and measurement (as seen in fig.2).
Could anyone please provide me suggestions regarding improving the simulation results inorder to match with measurements. It would be also great if someone provide me some papers related to this sort of foil antennas.
Regards,
Sravan
It looks very similar to me - you should be pleased to get a better match and wider bandwidth than you expected. Not having PEC in your measurements may have made the difference. The difference between -10 dB and -20 dB is 9% of the power. Near the centre of the Smith chart it doesn't require much of a change to go from -10 dB to -20 dB (.31 from centre to .1 from centre). A lot of your improved match might be loss?
Dear Malcolm White,
The results in the simulation and measurements are provided after considering the loss. Actually the aim is to have the simulation results similar to measurements. So I would like to know what needed to be changed in the antenna to improve the results.
If your simulation model is PEC, as you say in your question, then you have not taken account of all the losses - PEC is not available for building real antennas, so your measurements will not have used PEC.
How did you feed your antenna? The simulation seems to have used a small drive element that cannot be the same as the one used in the measurement. It is difficult to feed this sort of antenna in real life without changing the impedance. If you used a coaxial cable or microstrip then it is not balanced and there could be radiation from the feed. If you used a balun, then the impedance of this will change the impedance of the antenna.
Apart from the feeding technique, try changing the feed point.. As I can see your results, if you try to change the feed point it might help you to attain the desired output...
Dear Kilaru,
I was changing the feed point but I couldnot observe any major changes in resonaces.
I think, Mr. Malcolm White explain well, You have to match your practical Proto, and Simulation model exactly then only you can expect very similar results, obliviously constrains will be material properties, feed point etc..so you need to consider in simulation similar as practical feasible.
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