I've got this phone I'm doing some range testing with...Namely, a Samsung S5 with the latest firmware and I'm testing the WLAN/Bluetooth radio.
This phone has unbelievable range...but, when I replace the phone with a similar homemade class 1 device (20dBm) with this Molex antenna, my range is just about half of the Samsung. The reciever is the same and I think that the power is the same (I can only guess that Samsung will output max power that the class of the device will allow when needed), so the only thing that's different is the antenna and the matching network.
I thought of a LNA, but LNAs that I have seen are unidirectional, and since Bluetooth communications need to be bidirectional (an acknowledgement after each packet), having only one device with a higher transmit power would only solve half the problem.
Am I correct in thinking this? Can I do as well as a cell phones WLAN/Bluetooth RF transmitter circuitry by impedance matching that antenna or is there a common topology with LNA's or something that I'm not aware of?