Why don't you try a printed spiral antenna........ i'm not sure...just give it a thought

hi sowmya99336

I appriciate your idea. I myself think the same. The only problem is the maximum power . Do you know any subtrate to handle 300w of power.

Regards

Hi mirok

As far as I know, 300W is a huge power which cannot be handled by microstrip antenna substrates.....

I suggest you call any manufacturer like Rogers corporation and find out if at all any substrates exist..

Regards n best wishes

"300 watts" over "Bandwidth:1-4GHz" ??  Ouch!

To what are you up?

A discone is a good choice. A helix type antenna may also work for you.  If you have the time and $$, checkout quadridge horn antennas.  Try Nurad (http://www.nurad.com/Horns.htm).

Discone, Helix, and Horns are not planer.

I think it would be impossible to have a 300 W output for a bandwidth of 1-4Ghz, you migth get radiated during your testing......

Hi yan75,

There is no need to test the antenna with 300W of input power. for testing I apply much less power:)


Tanx for your attention

OOps missed the part about need to be planar. Is it 300W cw or pulsed?  Makes a diiferece.  There are materials (ie ceramically loaded teflon from Rogers Corp and others). Teflon can handle the temperatures from the power but the copper trace may not.  Ask Rogers Corp about thicker copper clad (i.e. typical 1oz copper, try 2 to 5 oz copper).  The problems with frequency indendant antennas can be the matching balun (except for some patches, then it's the feed point).  The trick is to get the heat out.  If you have the deepth you can try loaded cross dipoles in a cavity.  The dipoles can be designed to handle high power levels.