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need comments on this antenna

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vishal_sonam

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Hello,
i have worked on the attached paper.In this paper it is a high gain antenna using RT Duroid with stacked patch but this antenna is very big.
As i also worked on this paper but i have used FR4 for my simulation and for the fabrication also i got good result on FR4 but my antenna is also very big as it has ground plane of 200mmx200mm and with the same side view as shown in figure of this paper.
so i want to know is this work good or not.
please comment on this as i m very worried about it.
 

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  • ejsr_32_2_06.pdf
    169.1 KB · Views: 122

Hello,

To say it in a popular way; there is lots of air between the patches and the ground plane (and in between the patches), so most of the field lines go through air, reducing the influence of the substrate. So you may see a small reduction in center frequency when changing from RT Duroid to FR4. As the design is rather wide band, you may not even notice this. You don't have to worry about your observations.

Small (with respect to wavelength), high gain and wide band don't go together, this is a physical limitation rather then a technical. If you want a smaller antenne, gain and or efficiency will reduce.
 

To be honest, there's no way to say conclusively about antenna just by looking at it and making assumptions. This is the beauty of RF and electromagnetic, because it's highly unpredictable.

After doing thousands of simulations, i realise that the best way to find out is to do the design and simulate the results. After all, what's the point of deducing something when you are not sure of the end results by the way?

The best to find out if it works good, is to design it and fabricate it. It's a challenge nonetheless, but it's cool to know.
 
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    Nanga

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I am currently trying to simulate a simple circular patch antenna with lumped port. I just follow the steps which is written in the paper but there's something wrong in my antenna. I cannot have the same gain around 8db in the paper. I have -db's :( can somebody help me to design the patch antenna on FR4 substrate.
thanks all
 

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  • circular patch antenna on MTM.pdf
    237.6 KB · Views: 132

post your files here to get some feedback.

regards
elchiquito
 

I have checked the file, everything you have drawn is according to the paper, and i have not seen any minor mistake's either but still the gain is way below what is actually published in the paper.i am sorry i couldn't be of any further help

Regards
Elchiquito
 

yeah, that's what I cannot understand :(
well thank you anyway :)

elchiquito said:
I have checked the file, everything you have drawn is according to the paper, and i have not seen any minor mistake's either but still the gain is way below what is actually published in the paper.i am sorry i couldn't be of any further help

Regards
Elchiquito
Click to expand...
 

Nanga said:
yeah, that's what I cannot understand :(
well thank you anyway :)
Click to expand...

i have seen your file and i think you made some mistakes. you design is not completely right according to me.
 

vishal_sonam said:
i have seen your file and i think you made some mistakes. you design is not completely right according to me.
Click to expand...

Please help me. What mistakes did you see? I was changing the port sizes but gain is not coming to 8db
 

Nanga said:
but gain is not coming to 8db
Click to expand...

Have you simulated with loss tangent for the FR4 substrate? FR4 has high loss tangent and this will reduce the gain of patch antennas. To check if gain is reduced by substrate loss, you could simulate with lossless substrate.
 

volker_muehlhaus said:
Have you simulated with loss tangent for the FR4 substrate? FR4 has high loss tangent and this will reduce the gain of patch antennas. To check if gain is reduced by substrate loss, you could simulate with lossless substrate.
Click to expand...

Yes. But I have to do same as paper says. "Circular Patch Antenna On metamaterial". That says FR-4 will have permittivity 4.9 loss tangent 0.025, permeability 1, substrate height 0.25mm.
I'll try it with lossless substrate just to check. Thank you
 

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