Material for antennas

  • #1
Would it be possible in theory to develop a material with very slow velocity factor to build dipoles immersed in a slow velocity factor gas in order to make much smaller HF antennas?
 

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  • #3
marcusl
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Instead of using a high permittivity medium, you can load your antenna with lumped elements. You may have seen whip antennas on vehicles that have a large helical coil at their base.

Be aware that electrically small antennas have two drawbacks: first, they don’t couple as efficiently to EM waves as a full-sized antenna, and secondly, they generally have smaller bandwidth.
 
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