can we make 2W rf amp with two 1W RF amp?
Yes, there are several ways to ccombine powers.
1. 0 deg combine: using Wilkinson type combiners.
2. 180 deg combine: This is a push-pull type amplifier.
3. 90 deg combine: Sometimes, called hybrid combiner, and some people
call this a balanced amplifier.
Each method has merits and demerits. #3 method is very popular because
it provides almost perfect impedance match, and improves stability.
You might want to check Gonzales' book to find out more details.
But the combiner network has some loss, and you will not get exactly 2W
from 2 sets of 1W amplifier.
Regards,
S. H.
All those combiners will work, PROVIDED that the two 1 W amps are matched in phase. If not, then they will not behave when combined. You might have to tweak the phase length on one path to get a better match.
Remember that in a combiner the impedances must be the same for the two amplifiers , if don′t the looses are really bigs .
I think that a hibrid combiner is the best (I think you are trying to use it for 2.4 ghz.)
Definitely not. At such low power levels there are plenty amplifiers covering 2W output power (remember that ususaly they don't have a gain better than 10...15dB) on ISM band (if you're talking about 2.4Ghz).
regards,