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How thick is the ground plane of patch antenna?

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eng.dreamer

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how thick is a plane

hi all;

I am working on a patch antenna for mobile handset, as I know the PCB of the mobile acts like a ground for the antenna (doesn't it?!), I just want to know what is the practical thickness of such ground, and if it's possible what's the material of the PCB?

Thanx in advance
 

vfone

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patch antenna ground plane in mobile phones

- With the increase in height, the fringing fields from the edges increase, this increases the extension in effective patch length, however decreasing the resonance frequency.
-The Bandwidth of the patch antenna increases with height.
-Generally, the patch antenna efficiency increases with an increase in the substrate thickness initially due to the increase in the radiated power.
-Decreasing the substrate Dielectric Constant Er the Bandwidth of the patch antenna increases.
 

Abhishekabs

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For Mobile they may be using FR4 or any teflon pcb.
(depend on cost & quality)
The thickness of copper(ground plane) may be 1oz, 1/2 oz rolled.
(It is surely less than 0.1mm I guess.)
Please correct me if I wrong,
Human body also acts as a ground & it affects radiation performance.
I hope this is the answer youe are expecting!!.
 

vfone

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To use the human body as a ground for a patch antenna, is something that really need a patent…or a correction, as you said.
 

Abhishekabs

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I was not saying about using human body a patch antenna ground plane.
I wanted to tell about effect of human body on patch antenna performance.
since he is talking about mobile device, so I remembered that & I posted.
 

eng.dreamer

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well my friends less than 0.1mm is too small, do u mean the metal thikness of the PCB?
Anyway, do u know a well known supplier where i can have such details from?
 

vfone

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I would recommend to use for your mobile design, instead of a Patch antenna, a PIFA (Planar Inverted F Antenna). Actually the last one is the most used approach in mobile phones.

PIFA have multiple advantages over Patch antenna in a mobile design:
Slightly wider bandwidth, availability for multi-band design, higher gain in both vertical and horizontal polarization, less sensitivity to human body interaction (due to large current flows on the under-surface of the planar element and the ground plane).
The distance between the active element and the PCB ground for a PIFA antenna used in a handset, is not standard, and it is somewhere between 3 to 6mm (or maybe more if the handset design allows for higher thickness).
 

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