| Summary: | A compact coplanar waveguide (CPW)-fed multiple-input-multiple-output (MIMO) antenna for indoor ultrawideband (UWB) applications is presented. The overall size of the antenna is 31 × 43 mm2. To increase the isolation factor, the common ground plane (CGP) is reinforced with a set of corrugations and frills and the outer ground plane of the first port is self-coupled. The radiators are designed perpendicular to each other in order to improve the pattern diversity. The measured results show the antenna operates at frequency range 3.9–8.1 GHz. The mutual coupling of less than −15 dB in almost all over the bandwidth, achieving a −31 dB at 5.4 GHz, proposes it as a good candidate for UWB applications in indoor systems.
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