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A concept using sandwiched frequency selective surface (FSS) as a frequency selective reflection plane is proposed for dual-frequency reflectarray system. The reflection phase range of a reflectarray relies on the thickness of the substrate. Usually, we need a tradeoff between the wide phase range and the smooth linear level, especially for dual-frequency system. By inserting an FSS between the reflectarray...
In this research, an experimental study has been carried out to measure the MIMO performance in LOS and NLOS indoor environment by using a 2 times 2 MIMO system where the MSAA is used as the receiving antenna with different array spacing. The EVM was measured to demonstrate the performance of the MSAA in the MIMO communication systems. It is found that larger array spacing can improve the EVM, and...
In this paper, we report our experimental and numerical results, confirming the phenomenon of dual in-phase reflection, i.e. dual-resonant behavior, for a TM-polarization plane wave oblique incidence on the conventional mushroom-like EBG structures. A modified local resonance cavity (MLRCC) model of EBG structures has been presented to explain the essential features of dual- resonant behavior and...
Array antennas have been widely studied and used for base stations because they are effective in solving the problems of multipath fading and co-channel interference and improving performance and capacity in wireless communication systems. However, little effort has been made for developing array antennas suitable for mobile handsets, because of the difficulties such as the limited space on the handset...
The characteristic of a large-scale array antenna of arbitrary geometry element was analyzed using the fast multipole method (FMM) combined with fast Fourier transform (FFT). The memory requirement and the CPU time are reduced effectively compared with conventional computational complexity of FMM. Some numerical results are given to show the efficiency of the method in this research. It should be...
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