| In recent years,wireless communication has developed rapidly.Meanwhile,mobile communication devices,which is pursuing higher and higher communication quality and farther communication distance,have been rapidly upgrading.UWB-MIMO communication system,which combines the advantages of ultra-wideband(UWB)technology and Multiple Input Multiple Output(MIMO)technology,can achieve high-speed and stable information transmission at a very long distance.Therefore,it has been widely concerned and studied by scholars at home and abroad.As one of the key components of UWB-MIMO communication system,UWB-MIMO antenna is very important,the performance of which will have a direct impact on the performance of the entire UWB-MIMO communication system.So,the research on UWB-MIMO antenna which is applicable to uwb-mimo communication system has very important theoretical research significance and practical engineering value.Based on the Split-ring Resonator(SRR)and complementary Split-ring Resonator(CSRR),two dual-cell UWB-MIMO antennas are designed with different compound mode in this paper.They obtains an isolation of more than 15 d B on their impedance bandwidth which covers the 3.1-10.6 ghz UWB band.In addition,they also have the trap function for certain specific frequency band.The first dual-cell uwb-mimo antenna is arranged in parallel.A resonance is introduced at low frequency band by mounting a SRR structure in the middle of the floor on the back of the antenna,which reduces the mutual coupling between the antenna unit in the frequency band near the resonance point.Therefore the isolation degree between antenna elements is improved,namely,the decoupling of the antenna is realized.In order to complete the trap wave for certain frequencies,two CSRR slots are etched on the radiation patch of the antenna unit,by which two resistance bands are obtained on the working frequency band of UWB-MIMO antenna.Besides,the antenna is optimized and physically processed.The test results of the physical antenna are in good agreement with the simulation results,which verified the rationality of the antenna design.The second dual-cell uwb-mimo antenna is is arranged in orthogonal.A SRR result is adopted to connect the radiation patch of the two antenna unit,by which a new current path is introduced between antenna elements and the coupling current between antenna elements is reduced.So the the isolation degree between antenna elements is improved,namely,the decoupling of uwb-mimo antenna is realized.Like the first dual-cell uwb-mimo antenna,the antenna obtains a trap wave in the range of 3.3-3.6 ghz frequency band by etching a CSRR slot on the radiation patch. |
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