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

2022 ◽  
pp. 1-1
Author(s):  
Ramakrishna Janaswamy
Keyword(s):  
Quality Factor ◽  
Cone Angle ◽  
Input Admittance ◽  
Biconical Antenna ◽  
Arbitrary Cone

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

2021 ◽  
Author(s):  
Ramakrishna Janaswamy
Keyword(s):  
Quality Factor ◽  
Cone Angle ◽  
Analytical Formula ◽  
Wide Angle ◽  
Slowly Varying Function ◽  
Input Admittance ◽  
Arbitrary Length ◽  
Biconical Antenna ◽  
Arbitrary Cone ◽  
Analytical Expressions

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. <br>

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

2021 ◽  
Author(s):  
Ramakrishna Janaswamy
Keyword(s):  
Quality Factor ◽  
Cone Angle ◽  
Analytical Formula ◽  
Wide Angle ◽  
Slowly Varying Function ◽  
Input Admittance ◽  
Arbitrary Length ◽  
Biconical Antenna ◽  
Arbitrary Cone ◽  
Analytical Expressions

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. <br>

NÉEL LINES STRUCTURES IN UNIAXIAL FERROMAGNETS WITH QUALITY FACTOR Q > 1

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-1947-C8-1948
Author(s):  
J. Miltat ◽  
P. Trouilloud
Keyword(s):  
Quality Factor ◽  
Quality Factor Q
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