A simple approach to reducing mutual coupling in two closely-spaced electrically small antennas

A simple technique has been proposed to reduce the mutual coupling between two MTM-inspired electrically small antennas that are closely-spaced. This technique relies on the self-cancelation of the induced common-ground and near-field currents and does not require any additional structures, which in turn simplifies the design process and reduces the fabrication cost. We have shown that for two small antennas sized λ
₀
/14.4 x λ
₀
/21.4 and spaced edge-to-edge λ
₀
/30.6 or center-to-center λ
₀
/13.6, the mutual coupling of |S
₂₁
| is reduced from -8.3 dB to -16.6 dB .