Design and Simulation of TD-LTE Dual-mode Mobile Terminal Antenna Combined with MIMO Technology

with the developing trend of the mobile terminal globalization, multi-standard coexistence mobile communication terminal will play an increasingly importance on the everyday lives of the people. TD-LTE is the TD-SCDMA subsequent evolution technology, which is one of the third generation (3G) international communication standard technologies defined proposed by China and has been widely accepted and approved by other countries in the international, and is also widely considered in the forth generation (4G) mobile communication. MIMO technology, which utilizes multiple antenna to improve spectrum efficiency and increase the system channel capacity, is one of the 4G key technologies. In the basis of the wide deployment and application of the TD-LTE and TD-SCDMA networks, the paper puts forward a design of TD-LTE dual-mode mobile communication terminal system combined with MIMO technology in the 2.57-2.62GHz frequency band. The proposed MMO antenna system consists of two meander line monopole. They are designed to be bent opposite to one another to reduce the mutual coupling. The TD-SCDMA (1.8-2.4GHz) antenna system is based on the PIFA antenna structure, with the "inverted F" removed from the upper surface. To achieve a good matching, a rectangle sheet with size of 44.0mmx15.0mm on the full ground plane is removed. In addition, the effects of parameters between MIMO antennas and TD-SCDMA antenna are studied by using Ansoft High Frequency Structure Simulation (HFSS). On the basis of the simulated results, the proposed system has the isolation of 26.7dB at the central frequency of 2.6 GHz, the antenna gain improves to 6.34dB and the antenna radiation efficiency can reach to 98.12%. The design provides a favorable reference for TD-LTE dual-mode mobile terminal.