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# How can I calculate the Resonant Frequency of my microstrip patch antenna??

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#### pirok

##### Junior Member level 2
Hi every body
can anyone help me with calculating the Resonant Frequency of my microstrip patch antenna?

I think you need an approximation for rectangular patch antenna, it is fr (frequency resonance) = c0/2/sqrt(epsilon_r)/L
epsilon_r is the dielectric constant for the substarte and L is the length of Patch

HR Karami

pirok

### pirok

Points: 2

I need the dimensions of a practical patch antenna ,in hfss
can you plz recommend me that dimensions?

Yes, it is possible, but what is your means about the antenna design?

you can simulate a probe feed patch antenna in HFSS by parameters as follows,

L_GND (the length of ground plane) = 80 mm
W_GND (the width of ground plane) = 50 mm

L_Patch = 44.6 mm
W_Patch = 33.2

h (height of the substrate) = 2.87
epr (Dielectric constant of the substarte) = 2.2

frequency range 2.5-3.5 GHz, with resonance frequency about ~2.8 GHz

position of the probe feed (-W_Patch/2 + 8.9 mm, 0mm)

Good Luck my friends

pirok

### pirok

Points: 2
Thanks a million my friend,
So you think that the GND should big bigger than substrate?
If they are in same size ,will it cause any problem?

No, No, It should be noted that the L_GND = L_Substare & W_GND = W_Substrate.
the patch located at the top of the substrate.

In this picture, the substrate is blue and the patch is grey. the GND is behind the substrate. the red tip is the position of the feed probe.

pirok

### pirok

Points: 2
All right, i got that
Thanks alot.
May I have more question if i need help?

yes, you sure. I will glad for helping you.

pirok

### pirok

Points: 2
Thank you for your help in this matter
I have problem with analayzing , runing and Convegency of my schematic.
how should i start?

Thank you for your help in this matter
I have problem with analayzing , runing and Convegency of my schematic.
how should i start?

what is your software? HFSS or CST or FEKO or the other softwares?

pirok

### pirok

Points: 2
You can use HFSS ''Antenna Design Kit'' for designing the patch antenna. All you need to do is mention your resonance frequency and this design kit will generate the design in HFSS. You can give it a try and get some ideas.

pirok

### pirok

Points: 2
Thank you all,
my software is HFSS

Antenna magus is useful too, you can design any antenna with it and export in FEKO, CST and HFSS.

pirok

Points: 2