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I designed different types of bowtie antenna in CST. But this type of antenna results s11 is not good. I want to increase of antenna bandwidth. I'm trying to get better bandwidth by changing antenna sizes. What can I do for it?

Some papers of wideband antenna:

  • Design of Bow Tie Antenna in CST Studio Suite Below 2GHz for Ground Penetrating Radar Applications
  • Design of Ultra Wide-Band Bowtie Antenna for GPR Applications

Features:

  • FR4 substrate
  • frequency range: 100-700 MHz (bandwidth range)

Changed parameters:

  • feed trace dimension
  • substrate dimensions

type1 type1 results

type2 type2 results

type3 type3 results

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  • \$\begingroup\$ these don't look bad at all! So, you can play on all the parameters of your geometry. For example, you can make the taper on your first antenna steeper, or its ends wider, or both. \$\endgroup\$ Jan 17 at 16:46
  • \$\begingroup\$ Make it thicker in the Z-dimension. I don't know if you can simulate this in CST, but I'd try having copper on both sides of the substrate for the antenna elements (not the feedline). Stitch the layers together with vias all around the edges. \$\endgroup\$ Jan 17 at 18:33
  • \$\begingroup\$ Thanks for your ideas. I change the parameters of the antennas, but it does not get better. I use Antenna Magus, but I don't get good results there either. \$\endgroup\$ Jan 18 at 18:38
  • \$\begingroup\$ You are going to hit the limits on what physics will allow. You can't get arbitrary bandwidth from any geometry. What bandwidth are you trying to achieve? \$\endgroup\$
    – Jason
    Jan 19 at 0:15
  • \$\begingroup\$ Try to increase the substrate height (separation between the antenna patch and ground plane). Or perhaps try a different substrate \$\endgroup\$
    – DELTA12
    Jan 19 at 1:47

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