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arm_52
Antenna-Theory.com Newbie

Joined: 31 Jul 2011
Posts: 5

 Posted: Thu Aug 04, 2011 9:50 am    Post subject: how to feed a horn? i simulated a horn antenna at x band frequency for gain 15db with feko 5.2. who knows how can i have a coaxial feed for horn to get good matching?
rgoes2
Antenna-Theory.com Newbie

Joined: 11 Jan 2017
Posts: 6

 Posted: Thu Jan 26, 2017 1:42 pm    Post subject: Im just a newbie, but here we go, I did a probe feed horn antenna and I found that the impedance is related with the length, radius and the distance of the probe. Basically, what you have to find is the wavelength in free space(lambda0), and 1/4 of it will be the length of your probe inside the wave guide(more less), It need some adjust though. After you have to have the wavelength along the wave guide (lambdag) and 1/4 will be the distance of your probe. At last, you have to adjust your conector to have the radius of a +/- 50ohms ( Zo= (138/sqrt(Er))*log10(D/d) , aprox. 50). D is the diameter of your dieletric and d is the diameter of your pin conductor. Hope it helps, if I wrote something wrong please, correct me I will appreciate, because I am in the process of learning
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