Relation of inset feed point and resonant frequency of an inset fed patch antenna

[hsnumr]

Hi all!

I was simulating a simple inset fed patch antenna on Taconic TLC with Dk=3.2 and thickness of 0.79 mm at 2.45 GHz. While finding the inset feed position for optimum impedance match, what I observed was that the resonant frequency changes when I change the inset feed position making the design difficult for good S11.
Is it normal? Any good solution for this?

Your kind help is highly regarded.

 

[eldamar]

Hi hsnumr
During my workings about the microstrip patch antennas, I observed that, position of the inset feed changes the antenna return loss value and also the antenna bandwidth not the resonant frequency.
For example, let's say return loss (S parameter ) was found -8db when inset feed position was chosen wrongly and it was found -15db when inset feet position was chosen properly but those are both in the same resonant frequency such as 2.45Ghz.
My suggestion is, You should control the length and width of your patch (especially length ) to obtain true resonant frequency value.

Regards eldamar..

 

[hsnumr]

Thanks eldmar for your help and kind reply. God bless.