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NEW TECHNIQUES FOR INCREASING ANTENNA BANDWIDTH WITH IMPEDANCE LOADING

By R. A. Formato

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Abstract:
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 profile that produces travellingwave 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 CFOoptimized loaded monopole antenna is described in detail and compared to the same structure loaded with a fractional Wu-King profile. The CFO monopole generally performs better than other designs using either the full or fractional Wu-King profiles or the extended Wu-King profiles. The methods described in this paper should be useful in any wire antenna design that utilizes impedance loading to increase bandwidth.

Citation:
R. A. Formato, "New Techniques for Increasing Antenna Bandwidth with Impedance Loading," Progress In Electromagnetics Research B, Vol. 29, 269-288, 2011.
doi:10.2528/PIERB11021904

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