In this study, a new compact broadband two‐port multiple‐input–multiple‐output (MIMO) antenna using shared radiator is proposed. The radiator making an angle of 135° from X‐axis is symmetrically shared by two tapered microstrip feed lines in orthogonal polarisations. The shared radiator MIMO antenna is more compact as compared with conventional MIMO antenna which uses separate radiator for each port. The proposed antenna is designed on low‐cost FR4 substrate (dielectric constant = 4.4, and loss tangent = 0.02) of size 39 × 39 mm2 and provides a bandwidth of 136.63% (2.4–12.75 GHz) with reflection coefficients, S11/S22 less than or equal to −10 dB and values of mutual coupling between antenna ports S21/S12 less than or equal to −15 dB. Through the utilisation of end‐loaded meandered line stub attached to modified curved ground plane, low mutual coupling between antenna ports is achieved. The simulated results for input and radiation characteristics of the proposed MIMO antenna are compared with corresponding experimental results.