The user manual of iPad 1st Generation states:
http://manuals.info.apple.com/MANUALS/1000/MA1524/en_US/iPad_Important_Product_Information_Guide.pdf
Exposure to Radio Frequency Energy iPad contains radio transmitters
and receivers. When on, iPad sends and receives radio frequency (RF)
energy through its antenna. The Wi-Fi and Bluetooth® antennas are
located behind the screen to the left of the Home button, and behind
the Apple logo. iPad has been tested and meets the SAR exposure
requirements for Wi-Fi and Bluetooth operation.
A cellular antenna is located at the top edge of the iPad Wi-Fi + 3G,
when oriented with the Home button at the bottom. For optimal
mobile device performance and to be sure that human exposure to RF
energy does not exceed the FCC, IC, and European Union guidelines,
always follow these instructions and precautions: Orient the device in
portrait mode with the Home button at the bottom of the display, or
in landscape mode with the cellular antenna (located under the black
edge at the top of the device) away from your body or other objects.
In the 1st generation iPad, there were TWO Wi-Fi antennas; one at the Apple logo and another one at the bottom next to the Home button. http://www.ifixit.com/Teardown/iPad+Wi-Fi+Teardown/2183
In the subsequent models of iPad, ifixit.com's dissection found that "The Wi-Fi antenna is attached to the bottom right edge of the rear case of the iPad via screws and a cable." It is not at behind the Apple logo anymore (possibly to make the unit thinner). Apple
failed to update their newer user manuals with this change. Curiously,
they deleted the part that says the WiFi and Bluetooth antennas are at
the bottom next to the Home button. They continued to say that users
should orient the iPad with the Home button at the bottom when
viewing in portrait mode (Note: there is already another "cellular"
antenna at the top of the iPad which needs to be avoided!). Even more curiously, they continued to state that the WiFi-Bluetooth antenna is behind the Apple logo, even though it's not! Perhaps
Apple realized that - if users know about the real location of the
WiFi-Bluetooth antenna - they will have a hard time deciding how to
orient the iPad when there are antennas both at the top and the bottom
while in portrait mode, and it's impossible to hold the iPad with the
hands in landscape mode while trying to avoid the antennas on the left
and right.
With the WiFi-Bluetooth antenna at the bottom of the
iPad being undisclosed in the current user manuals, there is no warning
to users about keeping a distance from this bottom antenna. People will
be resting this antenna directly on their laps, and be touching it when
holding the iPad with their hands without knowing the risk.
iPad 2 Manual:
iPad 3 Manual:
http://manuals.info.apple.com/MANUALS/1000/MA1606/en_US/ipad_wificellular_important_product_info.pdf
Exposure to Radio Frequency Energy iPad
contains radio transmitters and receivers. When on,
iPad sends and receives radio frequency (RF) energy
through its antenna. The Wi-Fi and Bluetooth®
antennas are located behind the Apple logo. iPad
has been tested and meets the SAR exposure
requirements for Wi-Fi and Bluetooth operation.
A cellular antenna is located at the top edge of
iPad Wi-Fi + 3G, opposite the Home button at the
bottom. For optimal mobile device performance
and so that human exposure to RF energy does not
exceed the FCC, IC, and European Union guidelines,
always follow these instructions and precautions:
Orient the device with the cellular antenna (located
under the black edge at the top of the device) away
from your body or other objects.
iPad 2 WiFi-Bluetooth replacement antenna:
Pad 2 Wi-Fi EMC 2415 model
No more WiFi antenna at the Apple logo:
iPad 2 Wi-Fi EMC 2560 model
No more WiFi antenna at the Apple logo:
iPad 3 Wi-Fi model
iPad 4 Wi-Fi model
No more WiFi antenna at the Apple logo:
iPad Air
No more WiFi antenna at the Apple logo:
iPad Mini
WiFi antenna is at the bottom left of the iPad Mini:
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