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A compact monopole ultra wide band (UWB) antenna is analyzed and described with defect in ground plane.

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In this paper, a flexible UWB antenna with band notched characteristics for high speed WLAN applications is presented. The flexibility of the designed antenna is achieved by developing the antenna on a flexible Teflon substrate. The proposed antenna primarily consists of a slot loaded octagonal star-shaped patch with a partial ground plane for wide operating bandwidth. A split ring resonator (SRR) based stop band filter is embedded in the ground plane to realize a rejection band characteristic to mitigate the interference impact from wireless local area network (WLAN) IEEE802.11n (5.725-5.825 GHz) band. The measured result shows that the suggested antenna operates over 3.25 to 13 GHz with a fractional bandwidth of about 120% with a peak gain of 6.7 dBi. The measurement results also confirm the presence of the rejection band from 5.7-6.2 GHz. Also, in terms of flexibility, the antenna provides high robustness in the performance for different types of bending conditions. The obtained results depict that the proposed antenna is suitable for mounting on all types of surface area with band rejection characteristics.

A compact dual wide-band multiple-input-multiple-output (MIMO) radiator is presented in this article. The MIMO radiator is developed on a 1.5 mm thick FR-4 substrate. The proposed structure is composed of U-shaped patches which are connected with small rectangular slit loaded circular rings and partial ground plane with chamfer edges. This arrangement is placed symmetrically at a far distance of 2.5 mm to achieve dual-operating bands with a high amount of isolation, radiation efficiencies and group delay between two radiators. The proposed compact dual-band radiator is resonating at 2.5/6.4 GHz frequencies and it provides isolation greater than 20 dB over the operating bands. The proposed design has a size of 0.45λ 0 × 0.291λ 0 × 0.03λ 0 mm and |S 11 | of about 41.25 dB and 14.58 dB. This design has a wide impedance matching in the range of frequencies from 2.38 GHz to 3.17 GHz & 5.14 GHz to 7.39 GHz with |S 21 | < 15 dB. The performance of diversity is calculated through diversity gain (DG) higher than 9.99, and Envelope Correlation Coefficient (ECC) which is less than 0.04 over the operating bands.