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Power handling capability of microstrip antennas

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svarun

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Hi all,
A happy new year at the outset. Typically how much maximum power can microstrip p@tch anternnas operating around 20 GHz - 30 GHz handle ? For lower frequencies ( say < 5 GHz ) how much would this figure be ? Is it few watts or more than that. Thanks for your time
 

High power in antenna can cause voltage breakdown and excessive heat (due to conductor and dielectric antenna losses), which would results in an antenna failure.
Usually the maximum power for a single microstrip antenna for frequencies <5GHz shall be less than 50W.
At 20GHz the power is going down to <20W
Greater power handling can be achieved by combining multiple elements into arrays.
 

svarun said:
Hi all,
A happy new year at the outset. Typically how much maximum power can microstrip p@tch anternnas operating around 20 GHz - 30 GHz handle ? For lower frequencies ( say < 5 GHz ) how much would this figure be ? Is it few watts or more than that. Thanks for your time

General power handling concept are the same for every type of radiating antenna.

For µstrip pacth you should know the ohmic loss, then calculate dissipate heat and temperature rising, then do considerations about chemical resistance to the heat.
For my knowledge there are many destructive effects possible:
1) heat detach the glued copper
2) heat deform the dielectric
3) Strong |E| field may engine the arc around the edges (KVolts needed)

Help yourself with a software program made by Rogers (the microwave laminate factory leader). Look for MWI.EXE on Roger's site. It's old fashioned DOS software, but contain thermal consideration not found on more recent, powerful and expensive sofware.
Only if you cannot be able to find it, tell me and i'll upload it.
 

Thanks a lot Sergio. I'll look at the site. Just one thing. Can you just give a feel for the numbers ? Is it in watts or 10s of watts or can it go upto 100 W say. Please note that I am looking at it in a very general sense.

-svarun
 

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