return loss at 0 frequency?

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rameshrai

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Hello,

My inset fed patch antenna simulation shows return loss of -12.5dB at 0 frequency. attached pic shows the problem. I have changed almost all parameter(gap, fed width and fed length etc) to bring it up to 0dB but it is not happening.

How can I bring it up,

looking forward for advice

thanks,
ramesh
 

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FYi your attachment is flagged by the forum admin and we can't open it. You might want to fix it.
 

What does return loss at 0 Hz matter at all?

You didn't tell how you achieved the results, we just can assume that the loss curve is plausible according to your antenna design and/or simulation setup.
 

Every EM simulator has a lowest limit.DC is not included in simulation limits.
It's normal, the simulator made an extrapolation even it's wrong..
 

Initially, I thought it was the gap between the microstrip and the patch because I had put a guess value for the gap as I didn't find any good supporting theory. but as all of you pointed out specially bigboss that the curve at dc seen is not a much of concern i know now this.

I want to get confirmed about the gap, what is the best gap value, if there is any?

thanks
 

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