MIMO monopole antenna for LTE systems

A novel printed planar monopole antenna for LTE multi-input and multi-output (MIMO) application is proposed. By adding E-shaped parasitic elements, additional resonances are created, and then much wider impedance bandwidth can be produced. The proposed antenna provides LTE bands 1, 2, 3, 4, 9, 10, 11, 21, 23, 24, 25, and uplink of 15, 16, 22 bands. In order to provide low mutual coupling and envelope correlation, two of the antennas are combined with orthogonal polarizations. The mutual coupling of the antenna is lower than -19 dB, across the operation bands. Also, by adding a new stub to this structure and changing the parameters, lower frequency bands of LTE are covered. The designed antenna has small size area of 55 × 99 mm², which has a small size, with respect to recently reported antennas.