HELP: Horn Antenna Design
Hence I would like to ask if it it possible to design an horn antenna that is able to operate from 0.3GHz to 26GHz..?
In principle you may try to scale the antenna to function even at 0.3 GHz. Scaling is done by wavelength, so the horn antenna, to accept 300 MHz, will be quite impractically huge. For practical reasons there are log-periodic antennas just suitable for the UHF range from 300 to 800 MHz.
Designing such ridged-horn antenna is a tricky job, mainly the problem is the wideband impedance matching. You can make a horn antenna even for 10 MHz but it will be not practical.
Sure, the same way you can receive AM radio station with an antenna that is only 1 meter long, when a quarterwave antenna should be 300 meters long! Very poorly!
You will have lots of loss, ripple, and poor vswr. You will probably get multimoding going on that can not be supressed at the higher frequencies, so there may be some discrete frequency notches in the response.
It would be better to break it up into at least two different frequency bands, feeding two different radiators.
I understand that the size of the hrn antenna will be very big if we scale the antenna to work at 0.3GHz. Hence, instead of Horn antenna, is there any reccommended antenna type or design that I can look into that operates from 0.3Ghz to 26Ghz with good VSWR and Gain.
Thank You.
The Vivaldi antenna is the only one that really come close to the sort of bandwidths you are looking at. Any broadband antenna is going to be relatively low gain, I wouldnt expect anything much more than ~ 6 - 8 dB on any given freq within the range of the antenna.
As Biff44 suggested it would be better to break up the range into a couple of bandwidths
Cheers Dave
Dear,
I am designing dual rigid horn antenna as a final year project from 2-18Ghz. i know the which parameters to calculate but the formulas are not known to me. so if you can tell me the formulas or refer me any book. I shall be very thankful to you. plzzzzzzzzzzzzz help