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The impedance and radiation properties of four broadband monopoles are compared and the parameters of a new roll monopole are optimised experimentally and numerically. The performances of the roll monopole with various numbers of roll turns are discussed and optimised numerically. The measurements and simulations show that, compared with conventional broadband monopoles, the roll monopole
Chen, Z.N., Chia, M.Y.W and Ammann, Max: Optimization and Comparison of Broadband Monopoles. IEE Proceedings on Microwaves, Antennas and Propagation, December, 2003, Vol.150, pp. 429-435.