An approximate formulation for the characteristic impedance of noncoplanar fin antennas

This paper describes an approximation for the characteristic impedance of noncoplanar fin antennas. The formulation is simple and enough accurate for practical applications. The error made by the approximation is less than ±2%, it has been proved to be effective by stripline theory. The numerical results are good agreement to the experimental results given by literature. The expression is useful for the design of wideband antennas.