A Compact Low-Profile High Isolation MIMO Antenna For X-Band Applications

A novel compact low profile MIMO antenna is designed and implemented with high isolation for the X band applications. Proposed MIMO geometry is incorporated with two monopoles which are excited by 50 Ω feed line. To enhance the isolation between inter-elements meander line structures are is identically placed. These meander line structures are reducing the mutual coupling up to 26 dB. In the proposed MIMO antenna two elements cover the entire frequency range between 7.4-11.8 GHz for the X band applications. Meander line structure is working as a decoupling network which improves the isolation considerably. The overall size of the MIMO antenna is 25 × 30 × 1 mm 3 , and it offers inter-element isolation of >26 dB, envelope correlation coefficient is less than 0.2, and directivity gain >9.99 over the resonating frequency range. The proposed MIMO antenna model is fabricated, and measurement results are verified with simulated results. The antenna shows the satisfactory gain of around 4.8 dB in entire frequency range. The antenna shows the satisfactory gain of around 4.5 dB in entire frequency range.