You can simply consider gain and directivity interchangeable in this context. You need multiple wavelength antenna size to implement the intended directivity.
Hello
Thank you for your contribution.
A dielectric filled helix antenna have been suggested to reduce the size and also because it can be easily realized.
I have found many websites providing helix antenna calculator but not for dielectric filled (with ABS or Teflon/PTFE).
Can someone provide me some help, links or references to calculate dielectric filled antennas?
Thx
Michel
how can I measure performance of the antenna? in particular dbi and beamwidth?
The calculator says normal helix would be 4cm diameter. So when dielectric filled, may I try with half diameter?
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