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In this letter, a slot‐loaded low‐profile wideband microstrip patch antenna is presented and analyzed. The theory of characteristic modes (TCM) is applied to study the bandwidth and the radiation performance of the proposed antenna. We find that the resonant frequencies of two characteristic modes, with similar characteristic current distributions and far field radiation patterns, are close to each other. By exciting these two modes simultaneously, the proposed microstrip patch antenna attains wide band properties. In addition, the radiation patterns are stable over the whole passband, which is consistent with the prediction by the TCM. The measurements reveal that the antenna's operating frequency ranges from 2.275 to 2.705 GHz with standing wave ratio less than 2, which exhibits a wide impedance bandwidth of 17.3%. The thickness of the proposed antenna is only 0.04λ0. The realized gain is stable and varies between 8.2 and 9.7 dBi within the whole passband. Consequently, the TCM shows potential applications in the area of the design of a high‐performance slot‐loaded microstrip patch antenna. [ABSTRACT FROM AUTHOR]

A wideband antenna is designed by manipulating characteristic modes (CMs) of a metallic loop structure. It is shown that the resonant behavior of the CMs can be modified by inductive loading on the specific positions of the loop antenna. Therefore, it is possible to manipulate certain modes to ensure their resonant frequencies are close to each other. Then, a proper feeding scheme can be designed such that these modes are excited simultaneously and a multi‐mode wideband antenna can be obtained. It is found that by using the theory of characteristic modes (TCMs), the antenna design procedure becomes more intuitive. To validate the proposed approach, the wideband antenna was fabricated and tested. Simulation and measurement results indicate that it can achieve a wide impedance bandwidth of 51.6% with |S11| < −10 dB. [ABSTRACT FROM AUTHOR]

ABSTRACT In this letter, an antenna design method based on control of current distribution is presented. By adjusting the current distributions using reactive elements, the antenna can couple differently with the ground plane, achieving different performances. When the antenna is located in the ground plane where the electric field is strong, monopole-type current distributions are preferred to loop-type current distributions. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:2937-2940, 2016 [ABSTRACT FROM AUTHOR]

The resonant behavior of a handset printed circuit board (PCB) is analyzed by means of the Theory of Characteristic Modes (TCM). The information obtained is utilized to design a wideband antenna suitable for mobile terminals. To feed this resonant structure, a planar square plate is used. This antenna exhibits an excellent wideband performance and omnidirectional radiation patterns. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1408–1411, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21654 [ABSTRACT FROM AUTHOR]

In this letter, the numerical and analytical characteristic modes for perfectly conducting, elliptic cylinders are formally derived, and a comparison between them is presented. A good agreement between numerical and analytical solutions is observed. The analytical solution of the TM scattering from a collection of elliptic cylinders is also given, and results for different configurations are presented. © 1997 John Wiley & Sons, Inc. Microwave Opt Technol Lett 16: 243–249, 1997. [ABSTRACT FROM AUTHOR]