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A new geometry of wideband circularly polarised antenna with an asymmetric meandered‐shaped monopole is proposed in this communication. The wideband characteristics of the antenna are accomplished by the two asymmetric meandered‐shaped perpendicular arms of monopole and defected ground structure having slanting edge. The proposed prototype offers good performance in terms of impedance bandwidth (close to 102.04% in the frequency range 2.4–7.4 GHz) and the 3 dB axial‐ratio (AR) bandwidth (close to 37.5% in the frequency range 4.9–6.9 GHz). The realised impedance and AR bandwidths cover the WLAN/Wi‐MAX bands and Wi‐Fi band (5.5 GHz).

Abstract-In this paper, a single notched band at 5.2 GHz with complementary split ring resonator (CSRR) ultra-wideband (UWB) antenna and its implementation in designing of two-element multipleinput multiple-output (MIMO) with high and uniform isolation are experimentally demonstrated. The proposed UWB MIMO consists of a T-shaped stub in ground plane in between antenna elements of the size of λ at3.1 GHz /4 to achieve minimum 20 dB isolation, which is almost uniform in entire UWB band. The size of the UWB MIMO antenna is 0.31λ at3.1 GHz × 0.434λ at3.1 GHz × 0.008λ at3.1 GHz mm 3 , and it is printed on an RT/duroid 5880 substrate (ε r = 2.2, tan δ = 0.0009), which leads to good gain and high total efficiency of the antenna in operating bands. The simulated and measured results show good agreement for the impedance bandwidth (|S 11 | < −10 dB) and isolation (|S 21 | < −20 dB) in most of the operating band, excluding the notched band at 5.2 GHz in UWB range. The simulated, measured and calculated MIMO antenna diversity parameters prove that the antenna is suitable for UWB MIMO systems.

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