An LTCC Interference Cancellation Device for Closely Spaced Antennas Decoupling

• Published in: IEEE access Vol. 6; pp. 68255 - 68262
• Main Authors: Qian, Ke-Wei, Huang, Guan-Long, Liang, Jia-Jun, Qian, Bin, Yuan, Tao
• Format: Journal Article
• Language: English
• Published: Piscataway IEEE 2018; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Admittance; antenna decoupling; Antennas; Decoupling; Electronic devices; Interference; Interference cancellation; Low temperature; MIMO (control systems); MIMO communication; MIMO system; Mobile communication systems; Multilayers; Mutual coupling; Overlapped antennas; Throughput; throughput enhancement; Topology; Transmission line matrix methods; Wireless communications
• ISSN: 2169-3536; 2169-3536
• DOI: 10.1109/ACCESS.2018.2879569

A compact interference cancellation device (ICD) offering a great decoupling for a pair of closely overlapped antennas and enhancing the throughput of the multi-input-multi-output (MIMO) system is proposed. The device is implemented using semi-lumped components with a compact size of 1.6 mm <inline-formula> <tex-math notation="LaTeX">\times \,\, 0.8 </tex-math></inline-formula> mm <inline-formula> <tex-math notation="LaTeX">\times \,\, 0.6 </tex-math></inline-formula> mm with the help of the low temperature co-fired ceramics multilayer fabrication technology. The proposed topology is applied to enhance the overall data throughput of a MIMO system with two overlapped antennas sharing a reduced clearance region. A MIMO antenna system consisting of two conventional coupled antennas locating at the same plane, and its counterpart containing two overlapped antennas integrated with the ICD chip are fully investigated. The experimental results demonstrate that around 10% overall throughput improvement of the MIMO system is obtained across the 2.4 GHz band while the ground clearance area of the antennas has been shrunk by 50%. It is also proved that the presented ICD device is a good candidate in applications of mobile terminals and wireless communication devices with very compact volumes.