Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
The antenna array have a farfield distance of about 3 meters, if i apply lower power like 0dBm instead of 20dBm, can i still able to measure the farfield radiation pattern at that 3 meters position?
The antenna array have a farfield distance of about 3 meters, if i apply lower power like 0dBm instead of 20dBm, can i still able to measure the farfield radiation pattern at that 3 meters position?
It depends; can you achieve a suitable SNR (Signal to Noise Ratio) in your measuring equipment?
Whether that is a network analyzer, or a Spectrum analyzer, or a sensitive power meter (like the -70 dBm sensor head from Agilent) ?
It really depends on your test equipment and setup, it would help if you could mention what you are using.
Also, it should be said, the actual power level is really immaterial (does not matter) to the 'physics' of the antenna, only to the test equipment (too much: overload and compression, or too little signal: degraded SNR as one intersects the 'noise floor' of the measuring device.)
It depends; can you achieve a suitable SNR (Signal to Noise Ratio) in your measuring equipment?
Whether that is a network analyzer, or a Spectrum analyzer, or a sensitive power meter (like the -70 dBm sensor head from Agilent) ?
It really depends on your test equipment and setup, it would help if you could mention what you are using.
Also, it should be said, the actual power level is really immaterial (does not matter) to the 'physics' of the antenna, only to the test equipment (too much: overload and compression, or too little signal: degraded SNR as one intersects the 'noise floor' of the measuring device.)
I plan to use network analyzer to measure the radiation pattern and spectrum analyzer to measure the receive power then get the gain.
I have no idea about the sensitivity of the equipments. Is it possible equipments from different manufacturer will have different sensitivity?
Yeah i guess that is inappropriate if you just wanna test it i suggest you take stay in some distance and that can keep you away from any kinda danger.What the other members have suggested is correct for you.
In addition to the test equipment you mentioned you will need another "standard-gain" antenna (at least a calibrated one) to measure the radiation pattern and gain .
At 6 GHz, no dangerous effects to humans are known. Find health standards and keep the safe rules. 100 mW is a quite low power- try if your antenna can heat your hand, I doubt you can feel anything.
A microwave oven generates 500 W at 2.45 GHz; this can bake your eyes and flesh, and nobody cares! People live in a fear of 500 mW from their cell phone, but they never stop talking!
i read some manual on 20dBm device, it says: it is not recommended to be near the source more than 30 minutes if distance is less than one meter from radiating surface.
it depends on what u mean is "bad". If it is cold outside and u have to warm up, it would be good. If u had some unpopped corn kernals, you could pop them! both good!
LOL, 100 mw, as long as u do not stare directly into a high gain antenna, u will be fine forever. There is a slight chance of cateracts in your eye if you fell asleep right in the focal point of the antenna. If you are not anywhere near the front of the antenna....there is no worry AT ALL.
The UK safe limit for RF power is 10mW/cm^2, so unless you focus all your power into an area less then 10 square cms you should be OK. Mind you the Russians limits is a lot lower at 1 mW/cm^2.
Frank
Yeah i guess that is inappropriate if you just wanna test it i suggest you take stay in some distance and that can keep you away from any kinda danger.What the other members have suggested is correct for you.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
