A novel coplanar waveguide-fed transparent antenna for ultra-wideband applications with enhanced bandwidth is presented. In this design different techniques have been used to broaden the bandwidth. The rectangular radiator of the antenna is equipped by the staircase technique to increase the overlapped resonant frequencies. Moreover, two major and minor symmetrical rectangular stubs are mounted on top of the quarter-circle slot ground by using a dual axis to significantly increase the bandwidth between 3.15 and 32 GHz for VSWR<2. AghT-8 transparent thin film is used in the design of the proposed antenna to obtain a very compact size and lightweight structure. Index Terms-monopole antenna, coplanar waveguide (CPW)fed, transparent antenna, ultra-wideband (UWB)

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A novel compact dual band-notched dielectric resonator antenna (DRA) for ultrawideband (UWB) applications is proposed. Here, the bandwidth enhancement and the first band notch is realized by embedding a stub that is located to the hollow center of a U-shaped feedline simultaneously. By etching an inverted T-shaped parasitic strip at the back plane of an antenna that is surrounded by a dielectric resonator (DR), the second band rejection is created. By cutting a slot at the proper position on the ground plane, the width of the second band notch is controlled. The proposed antenna size is mm or about at 3.1 GHz. The measurement results demonstrate that the proposed DRA provides acceptable radiation performances such as an ultra-wide impedance bandwidth of around 122% with two sufficient band rejections in the frequency bands of 3.22-4.06 and 4.84-5.96 GHz, high radiation efficiency, and nearly constant gain.Index Terms-Band-notched, compact, dielectric resonator antenna (DRA), ultrawideband (UWB) antenna.

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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. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:2387–2393, 2016