Janaswamy_Biconical_TAP.pdf (435.23 kB)
Download fileInput Admittance, Directivity and Quality Factor of Biconical Antenna of Arbitrary Cone Angle
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.
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Email Address of Submitting Author
janaswam@umass.eduSubmitting Author's Institution
Univerisyt of Massachusetts, AmherstSubmitting Author's Country
- United States of America