How to make a PIFA structure to finite ground plane with particular dimensions?
i have attached my PIFA antenna structure? how to make it to finite ground plane with particular dimensions? is my structure infinite gnd plane?
if i change the plane length, the results also getting vary. help me in this reg
---jayanthi
Hi, jayanthi:
I don't see any attachmenet. Please check it. Yes. PIFA antenna's performance may change significantly with the size of ground plane. It may also change with the strip thickness. Please provide the information when you provide your model. Regards.
Herewith I have enclosed my GEO files (1.geo and 2.geo).Upto my knowledge 1.geo is infinite ground plane, 2.goe is finite ground plane.1.geo is resonating at 2.43 GHz and 2.52 GHz but if iam trying to simulate 2.geo structure in IE3D it takes more than 1 GB to calculate the reuslts and iam not able to get the results for 2.geo.I need the resonant frequency for 2.geo structure.if you help me in this regard it will be very much useful for me.tell me the procedure to change the ground plane from infinite to finite.
Thanking you,
N.Jayanthi
Hi, Jayanthi:
I checked both of your structures. There are problems on both of them.
1. For the infinite ground plane model, you define No.0 substrates as good conductor. It is correct. However, you also define the finite ground plane shape as some polygons on z = 0. On IE3D, this means you dig a hole on the infinite ground plane. It is completely different from what you want. Please see the attached 1_r1.geo for the corrected file.
2. For the finite ground plane model, the shorting pin is touching the finite ground plane. However, you did not make sure the polygons are connected to the ones on the finite ground plane. It is basicall open circuit there. Attached r2.geo is the corrected file.
The shapes of the polygons are kind of strange. I am not quite sure how you built it. I did merge and divide the polygons for better shape. It will help in meshing.
Also, your antenna is resonating at 2.5 GHz. You define Fmax = 6 GHz and CELLS per Wavelength, Ncells = 20. It is way too fine and it will create too fine meshing.
For your antennas, you can use meshing frequency Fmax = 3 and Ncells = 15 to 20, or Fmax = 4 Ghz and Ncells = 12 to 15 to get very accurate results. For both of my corrected structures, I use Fmax = 4 GHz and Ncells = 15. It takes less than 45 seconds to simulate your 1st structure and less than 2 minutes for your 2nd structure for the complete frequency range.
Best regards,
HEREWITH IAM ENCLOSING THE PIFA CKT WHICH IS RESONATING AT 2.03GHz. ,FOR MOBILE APPLICATION THE RADIATION PATTERN IS NEAR OMNI DIRECTIONAL IN AZUMITHAL PLANE.AT THETA=30 DEGREE IAM GETTING NEAR OMNI DIRECTIONAL FOR THIS GEOMETRY,BUT THE GAIN IS 0 dB.WHAT I WANT TO KNOW IN THIS IS :IS THIS GAIN IS ACCEPTABLE FOR MOBILE APPLICATION ?.
EXACTLY HOW SHOULD BE THE RADIATION PATTERN FOR PIFA IN MOBILE APPLICATION.IF YOU EXPLAIN ME THE RADIATION PATTERN CHARACTERISTICS OF THE PIFA IT WILL BE VERY MUCH USEFUL FOR ME.
FINALLY I WANT TO KNOW WHETHER THIS CIRCUIT IS GOOD FOR MOBILE APPLICATION OR NOT.IF NOT WHY?
WITH THANKS
JAYANTHI