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A dual-band omnidirectional rectangular dielectric resonator antenna (DRA) is presented in this paper. Higher order and modes of a rectangular DRA with square cross section are used to realize dual-band omnidirectional operation. Working principle of using modes for omnidirectional pattern is explained based on dielectric waveguide model (DWM) method. Frequency ratio of the two bands for different dimensions and permittivities is studied. A prototype antenna for 3.5-GHz WiMAX and 5.8-GHz WLAN bands was designed, fabricated, and measured. Proposed design concept is verified by the simulated and measured results.
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Zou et al. (2016) studied this question.
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