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Taoglas FXP-14 U.FL antennas
Plantje:
I just received my two Taoglas FXP-14 U.FL antennas. I will probably build them into my laptop and connect them to my Huawei EM770W card tomorrow.
But I still have some questions:
-Is it okay to bend the antennas? (without breaking loose the connection of course)
-They should act as diversity antennas, what would be the best: put them close to one another or as separate as possible?
-I understood the back cover of my laptop is of rubber plated metal; will that cause reception problems? And if so: to what extend?
-Are there more hints, tips and tricks to be given?
Thanks!
Hengist:
--- Quote from: Plantje on January 11, 2011, 10:31:36 PM ----Is it okay to bend the antennas? (without breaking loose the connection of course)
--- End quote ---
Yes, it is. This is what these kind of antennas are been meant for. Be aware that the more you bend the antenna, the more you modify the antenna characteristics and probably, according my direct experience, quite quickly after a certain extent.
--- Quote from: Plantje on January 11, 2011, 10:31:36 PM ----They should act as diversity antennas, what would be the best: put them close to one another or as separate as possible?
--- End quote ---
I Managed to find some documentation:
page: http://maxon.com.au/menu_modules.php
module: http://www.maxon.com.au/udocuments/EM770W_HW_SPECV1.12.pdf
kit: http://www.maxon.com.au/udocuments/EM770W_DEMO_BOARD_GUIDE_1.02.pdf
I would never put them closer than the distance D between the two antenna connectors. I would start with a distance between 1xD and 2xD. For further references, I recommend you to have a look at antenna diversity theory and practices. I think, it strongly depends on mobility statistics of the transceivers with regard to the environment.
--- Quote from: Plantje on January 11, 2011, 10:31:36 PM ----I understood the back cover of my laptop is of rubber plated metal; will that cause reception problems? And if so: to what extend?
--- End quote ---
Insulators ("rubber") slightly modify electromagnetic fields.
Conductors ("metal") heavily modify electromagnetic fields.
Try to maximize
- open view
- distance
of the antenna(s) with regard to all/most metal parts.
--- Quote from: Plantje on January 11, 2011, 10:31:36 PM ----Are there more hints, tips and tricks to be given?
--- End quote ---
:)
If you need a professional-grade solution, consult a radio frequency agency.
If you need a personal-grade solution, just try many reasonable combinations while measuring absolute/relative performance. Wireless modules normally provide AT commands or application software to measure absolute/relative radio-frequency performance (RX/TS decibel, bit error rate, ...).
Plantje:
--- Quote from: Hengist on January 12, 2011, 10:13:19 AM ---Yes, it is. This is what these kind of antennas are been meant for. Be aware that the more you bend the antenna, the more you modify the antenna characteristics and probably, according my direct experience, quite quickly after a certain extent.
--- End quote ---
You mean they will not pick up the correct frequencies?
--- Quote from: Hengist on January 12, 2011, 10:13:19 AM ---I Managed to find some documentation:
page: http://maxon.com.au/menu_modules.php
module: http://www.maxon.com.au/udocuments/EM770W_HW_SPECV1.12.pdf
kit: http://www.maxon.com.au/udocuments/EM770W_DEMO_BOARD_GUIDE_1.02.pdf
I would never put them closer than the distance D between the two antenna connectors. I would start with a distance between 1xD and 2xD. For further references, I recommend you to have a look at antenna diversity theory and practices. I think, it strongly depends on mobility statistics of the transceivers with regard to the environment.
Insulators ("rubber") slightly modify electromagnetic fields.
Conductors ("metal") heavily modify electromagnetic fields.
Try to maximize
- open view
- distance
of the antenna(s) with regard to all/most metal parts.
:)
--- End quote ---
Thanks! Documents like these can be very helpful! I don't see GPS mentioned, but if I take a look in my device manager I do see the Huawei supporting GPS. I'm thinking of inserting the new antennas in a similar way as I have the current antennas. (And currently they're bend around the battery) I know they pick up 3G signal when installed in that area, so I hope it will work the same for these antennas. And perhaps I will try the antennas first while the device is open.
--- Quote from: Hengist on January 12, 2011, 10:13:19 AM ---If you need a professional-grade solution, consult a radio frequency agency.
If you need a personal-grade solution, just try many reasonable combinations while measuring absolute/relative performance. Wireless modules normally provide AT commands or application software to measure absolute/relative radio-frequency performance (RX/TS decibel, bit error rate, ...).
--- End quote ---
I found it very hard to find radio frequency specialists here in the Netherlands.
Anyway: I hope to start working on it tonigh. Thanks for your help so far!
Hengist:
Yes, it is normal that everything changes everything in the antenna characteristics: directionality, sensitivity, ... Commercial antennas are typically designed to minimize this variability to the maximum extent possible.
Plantje:
Yesterday I connected these new antennas. First I tried them while the device was still open and I didn't have the antennas stowed in some part of the device. Unfortunately no GPS sattelites where received.
At some point I will try the device outside as wel, but I think my Huawei EM770W just doesn't receive GPS :(
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