Dual-Band Coupling Element Based Antennas with High Port Isolation

A compact dual-band MIMO coupling element based antenna with high port isolation is proposed for the first time. The proposed antenna comprises four nonresonant coupling elements, the matching circuit, chassis of the mobile terminal, and de-coupling structures. The proposed antenna can cover two working bands of E-GSM900 and PCS1900. The measured results show that the isolation between the coupling elements operating at the same frequency is higher than 20 dB. The proposed structure can be applied to the MIMO system.