Wideband stacked maltese cross-shaped DR antenna for WiMAX and WLAN applications

摘要

A new maltese cross-shaped dielectric resonator (DR) antenna is presented and analysed as a wideband radiator. The antenna comprises of maltese cross-shaped DR, arranged in a stacked configuration and centrally fed by a coaxial probe. The proposed antenna radiates such as an electric monopole, generating omnidirectional linearly polarised fields. Three modes: namely, TM01δ, TM02δ, and TM03δ are simultaneously excited and merged in the composite structure to obtain a wide bandwidth of 59.5% [for voltage standing wave ratio≤2], covering frequency range from 3.15 to 5.82 GHz. The radiation pattern of the proposed antenna is fairly stable throughout the operating band with the measured peak gain varies from 3.27 to 6.09 dBi. A prototype of the proposed antenna is built and tested. Both the simulations and experimental results are presented and discussed. The proposed antenna is suitable candidate for worldwide interoperability for microwave access (3.5 GHz) and wireless local area network (3.65 GHz/4.9 GHz/5 GHz) applications. Moreover, it can also be used for lower European ultra-wideband frequency band (3.4–5 GHz) applications.