A novel low-profile, high-efficiency quad-band perforated rectangular dielectric resonator antenna (RDRA) for wireless communication applications has been introduced. The quad-band perforated RDRA consists of a single dielectric sheet virtually divided into four sections. The perforation technique is used to alter the dielectric constant of each section. The effective dielectric constant is changed according to the perforation radii and their separation distances. The quad-band RDRA is made of four blocks of different materials. An investigation of the radiation characteristics of the quad-band perforated RDRA has been introduced. Two quad-band perforated RDRA array elements are introduced for multiple-inputa??multiple-output applications. The effect of separation distances between the array elements for two different array arrangements has been studied. Cutting slots in the ground plane is employed to minimise the mutual coupling between the perforated RDRA array elements. The antenna structure is designed and analysed using the finite-integration technique, and confirmed using the finite-element technique.
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