New Techniques for Increasing Antenna Bandwidth with Impedance Loading

New methods are presented for increasing the bandwidth of wire antennas using impedance loading. This paper extends the seminal Wu-King theory of the internal impedance proflle that produces travelling-wave only current modes on a center-fed dipole antenna. It also presents a numerical optimization methodology based on Central Force Optimization, a new deterministic multidimensional search and optimization metaheuristic useful for problems in applied electromagnetics. A CFO-optimized loaded monopole antenna is described in detail and compared to the same structure loaded with a fractional Wu-King proflle. The CFO monopole generally performs better than other designs using either the full or fractional Wu-King proflles or the extended Wu-King proflles. The methods described in this paper should be useful in any wire antenna design that utilizes impedance loading to increase bandwidth.

[1]  Liang C. Shen,et al.  The cylindrical antenna with nonreflecting resistive loading , 1965 .

[2]  Richard A. Formato,et al.  Central force optimization: A new deterministic gradient-like optimization metaheuristic , 2009 .

[3]  G. Burke,et al.  Numerical Electromagnetics Code (NEC)-Method of Moments. A User-Oriented Computer Code for Analysis of the Electromagnetic Response of Antennas and Other Metal Structures. Part 1: Program Description-Theory. Part 2: Program Description-Code. Volume 1. Revised , 1981 .

[4]  Nihad Dib,et al.  Antenna benchmark performance and array synthesis using central force optimisation , 2010 .

[5]  Richard Formato,et al.  Central Force Optimization: A New Nature Inspired Computational Framework for Multidimensional Search and Optimization , 2007, NICSO.

[6]  Richard A. Formato,et al.  On the Utility of Directional Information for Repositioning Errant Probes in Central Force Optimization , 2010, ArXiv.

[7]  Richard A. Formato.  Parameter-Free Deterministic Global Search with Simplified Central Force Optimization , 2010, ICIC.

[8]  Richard A. Formato.  Issues in Antenna Optimization - A Monopole Case Study , 2011 .

[9]  C. Valagiannopoulos.  Electromagnetic Scattering of the Field of a Metamaterial Slab Antenna by an Arbitrarily Positioned Cluster of Metallic Cylinders , 2011 .

[10]  George Fikioris,et al.  Input admittances arising from explicit solutions to integral equations for infinite-length dipole antennas , 2005 .

[11]  Richard A. Formato,et al.  Improved Cfo Algorithm for Antenna Optimization , 2010 .

[12]  E. Altshuler,et al.  The traveling-wave linear antenna , 1961 .

[13]  Ronold W. P. King,et al.  Cylindrical Antennas and Arrays , 2002 .

[14]  Liping Xie,et al.  Convergence analysis and performance of the extended artificial physics optimization algorithm , 2011, Appl. Math. Comput..

[15]  Richard A. Formato,et al.  Pseudorandomness in Central Force Optimization , 2010, ArXiv.

[16]  B. Rao.  Optimized tapered resistivity profiles for wideband HF monopole antenna , 1991, Antennas and Propagation Society Symposium 1991 Digest.

[17]  Richard A. Formato,et al.  Central Force Optimization and NEOs - First Cousins? , 2010, J. Multiple Valued Log. Soft Comput..

[18]  Raj Mittra,et al.  Combined tapered resistive and inductive loading to increase the bandwidth of small antennas , 1992, IEEE Antennas and Propagation Society International Symposium 1992 Digest.

[19]  Richard A. Formato.  Are Near Earth Objects the Key to Optimization Theory , 2009 .

[20]  Richard A. Formato,et al.  Central Force Optimization Applied to the PBM Suite of Antenna Benchmarks , 2010, ArXiv.

[21]  Richard A. Formato,et al.  Central force optimisation: a new gradient-like metaheuristic for multidimensional search and optimisation , 2009, Int. J. Bio Inspired Comput..

[22]  P. Debroux,et al.  Wideband HF monopole antennas with tapered resistivity loading , 1990, IEEE Conference on Military Communications.

[23]  Richard A. Formato,et al.  CENTRAL FORCE OPTIMIZATION: A NEW META-HEURISTIC WITH APPLICATIONS IN APPLIED ELECTROMAGNETICS , 2007 .

[24]  Milton Abramowitz,et al.  Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables , 1964 .

[25]  A. G. Greenhill,et al.  Handbook of Mathematical Functions with Formulas, Graphs, , 1971 .

[26]  M. Kanda,et al.  Time domain sensors for radiated impulsive measurements , 1983 .

[27]  Adit Kurniawan,et al.  A Modified Bow-Tie Antenna for Improved Pulse Radiation , 2010, IEEE Transactions on Antennas and Propagation.