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# Input Admittance, Directivity and Quality Factor of Biconical Antenna of Arbitrary Cone Angle

preprint
posted on 26.07.2021, 03:10
New analytical expressions and numerical results for the quality factor and directivity as well as computationally convenient expressions for the input admittance of a symmetrical biconical antenna of arbitrary length $L$ and cone angle $\theta_0$ are presented. The quality factor for a wide-angle biconical antenna is shown to very closely approach the Chu's limit of $Q = (kL)^{-1}\{1+(kL)^{-2}\}$. Numerical calculations based on the analytical formula for antenna admittance confirm the conjecture that Foster's reactance theorem remains invalid even for perfectly conducting antennas. Furthermore, the variation of directivity of a wide-angle biconical antenna is a slowly varying function of its electrical length and is shown to depart significantly from that of a thin cylindrical dipole.

## Email Address of Submitting Author

janaswam@umass.edu

## Submitting Author's Institution

Univerisyt of Massachusetts, Amherst

## Submitting Author's Country

United States of America

## Read the peer-reviewed publication

in IEEE Transactions on Antennas and Propagation

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