Hi researchers, I have a double ridged horn antenna design and trying to improve S11. I'm trying to get the area in the black circle below -10dB as you can see on the S11 graph. I'm using CST2017 so, I tried to change a lot of parameters such as waveguide sizes, horn aperture sizes, flare angle, aperture length, distance between two ridge, thickness of ridge , etc. Normally increasing antenna sizes work but I dont want my antenna get bigger than it already is. Is there another way to do this. I'm open to any suggestion or article.
Thanks in advance...
Hi Yasin.
I think what you are seeing in the circled region of your S11 plot is simply the low-frequency cut-off of the waveguide feeding the horn.
Regards,
Ray
Hi Yasin
I you want to shift the resonant frequency to the lowest, there are various choices. One of them is to increase the width of the feed line.
You can lower the cutoff of double ridge waveguide by reducing the gap between the ridges and making the ridges wider, and also making the guide higher as well as wider. You may be able to make it higher even if you don't want to make it wider. If your feed is from coax (or microstrip, or slotline) to double ridge waveguide then lowering the cutoff of the double ridge guide should work. You need to get the transition right from coax, or anything else, to double ridge.
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