Printed Closely Spaced Antennas Loaded by Linear Stubs in a MIMO Style for Portable Wireless Electronic Devices

Antenna Selection for MIMO Systems with Closely Spaced Antennas

Physical size limitations in user equipment may force multiple antennas to be spaced closely, and this generates a considerable amount of mutual coupling between antenna elements whose effect cannot be neglected. Thus, the design and deployment of antenna selection schemes appropriate for next generation wireless standards such as 3GPP long term evolution (LTE) and LTE advanced needs to take th...

Mimo Capacity Optimization of Closely Spaced Patch Antennas

Compact Multiple-Input Multiple-Output (MIMO) systems will be a significant improvement for future high-bit-rate wireless applications. Closely spaced antennas however suffer from mutual coupling and highly correlated signals. In order to keep good system performance, the integration of these antennas in small areas needs to be optimized. Recent studies have analyzed a system model that takes i...

Mutual Coupling Reduction between Closely Spaced U-slot Patch Antennas by Optimizing Array Configuration and its Applications in MIMO

Closely Spaced Dual Band-Notched UWB Antenna for MIMO Applications

A closely spaced dual-band notched UWB MIMO antenna is proposed in this paper. A traditional semi-circular monopole with ultra-wideband operation is chosen as an element of the proposed MIMO antenna. When two of the UWB monopoles are put together closely, the mutual coupling between them is apparently strong. To reduce the coupling between the antenna elements, a T-shaped branch is inserted bet...

Bandwidth Improvement of Reflectarray Antennas Using Closely Spaced Elements

A bandwidth improvement method in reflectarray antennas by using closely space elements, i.e., unit-cell sizes smaller than λ/2, has been investigated both numerically and experimentally in this paper. A new definition of phase error has been introduced to analyze the broadband mechanism of closely spaced phasing elements. Through full wave EM simulations, it is revealed that closely spaced ele...