Where to buy antenna for laptop

[ch0c0late]

Hello!

I need to find out the antenna gain of the WLAN cards in my laptop and phone, as well as the transmitted signal power.
I have an Intel® PRO/Wireless 3945ABG in my laptop and an Atheros AR6003 in my phone. Can someone help me with this?


I tried to compute the gain myself, but I've reached a dead end.

I found that the unknown gain of an antenna can be computed with the formula:

Gain [dBi] = ReferenceGain [dBi] + (MeasuredLevel [dBm] - ReferenceLevel [dBm] )

The notations are:

Gain - unknown gain (of laptop or phone antenna)
ReferenceGain - gain of a reference antenna
MeasuredLevel - signal strength (in dBm) from the antenna of unknown gain
ReferenceLevel - signal strength (in dBm) from the reference antenna, measured in the same conditions as MeasuredLevel

I've used a reference antenna with a 3 dBi gain.

My values are:
ReferenceGain = 3 dBi
MeasuredLevel = -75 dBm
ReferenceLevel = -39 dBm

and after the computations the gain is Gain=-33 dBi (negative gain !!!)

I don't think these results are correct.

Can someone tell me what am I doing wrong?
Or even better can someone tell be the gain of these antennas?

Thanks!

[HiSpeed]

I had found some models of wi-fi antenna that you can buy for your laptop. Here are some suggestions that can help you. You must also go through some tips to install and configure the same. It is very important to get a proper guide for the same also. It is important to configure the same or it will not work at all.
Wifi Antenna's :

• Dell 1505 Wlan Pcie Card MINI-CARD And External Antenna
• Sabrent Wireless 802.11n Wi-Fi
• Toshiba Satellite Pro M300 ANTENNA
• Hawking HWL2 Hi-Gain WiFi