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A compact dual band-notched ultra-wideband (UWB) multiple-input multiple-output (MIMO) antenna with uniform rejection performance is designed on an FR4 substrate (35 × 23 × 1.6 mm3). Compared with the existing UWB MIMO antennas, a second-order notched band with uniform performance for 5.15–5.825 GHz is achieved, which results from the interplay between a 1/3λ open-end slot and a 1/2λ parasitic strip. A 1/4λ open-end slot is also applied to the 3.3–3.7 GHz reject band. The two slots are connected at their open ends, that can help to get the uniform reject performance for 5.15–5.825 GHz and make the high cutoff frequency of the impedance matching band go toward the higher frequencies. Excluding the two rejected bands, a band with |S11| ≤ −10 dB, |S21| ≤ −17 dB and frequency ranged from 3.1 to 10.9 GHz is achieved, and results show that a uniform performance for 5.15–5.825 GHz is obtained.

DUAL BAND-NOTCHED UWB MIMO ANTENNA WITH UNIFORM REJECTION PERFORMANCE