Hello
During my survey on monopole antennas , i found that monopole antenna length equal to (lmda g/4) as standard formula . it appear easy to find required length whenever we have desired resonant frequency. but, every time i want to calculate it , i got un-compatible results.
for the attached pics, Can any one help me to understand how these lengths of each branch is calculated and why the outher divided some length by 2 ?
thank you
@ Mohammed Berka , No this is part from published paper . What you mean by "Wheeler's summary" ?
Monopole antenna works similar to the dipole antenna considering the image of monopole opposite to the ground plane. Major difference between dipole and monopole is of their radiation resistance.
In your attached image, formulas are written to calculate the length of monopole antenna which is quarter wavelength long (Different length for different frequencies as Lambda = light velocity / Frequency of operation).
But when we use dielectric material than effective dielectric constant comes into picture because of the substrate- air boundary.
use following formula (in Image file) to calculate effective dielectric constant, for approximate length calculation.
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