MIMO antenna using resonance of ground planes for LTE mobile application

A Multiple-Input Multiple-Output (MIMO) antenna using resonance of ground planes is proposed for Long Term Evolution (LTE) mobile application. When the ground planes are excited by radiators, a resonant mode is generated. By combining the resonant modes contributed from both antenna element and ground planes, the proposed MIMO antenna realizes wideband property. Moreover, an inductive solenoid is employed to reduce antenna volume. This approach not only simplifies antenna design, but also effectively improves bandwidth and efficiency. In addition, the proposed MIMO antenna has excellent Envelope Correlation Coefficient (ECC) value of around 0.05 except for a small frequency range with increased ECC value of around 0.1, due to the nearly orthogonal radiation patterns of two radiators.