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A design method of reflectarray by the induced electromotive force method is proposed. The effect of oblique incidence from a primary source to a reflectarray element is included in the design process of the reflectarray by the proposed method. The CPU time for design of the reflectarray by the proposed method is small because mutual coupling between reflectarray elements are ignored. The reflectarray...
A concept of modulated scattering antenna array (MSAA) is proposed based on the modulated scattering technique. The antenna array is composed of one regular antenna element and several modulated scattering elements (MSE). The regular antenna has its RF front-end circuit, but the MSA has not. The configuration of the array antenna is very simple because only one branch of the front-end circuit is required...
In mobile communication system, it is a serious problem that radio wave signal from base stations is blocked by the high and dense buildings in a downtown, high-building district, especially in narrow streets, which will result in a weak signal level and poor communication qualities, and this kind of areas are typically called blind spots. Many efforts were made in order to eliminate blind spots which...
A novel concept using non-uniform frequency selective surface (FSS) backed as a reflection plane for amplitude controlled reflectarray is proposed. First, a modified square-loop FSS element with broad reflection response band (from −22dB to 0dB) is designed. Then, a non-uniform FSS using the modified square-loop element is backed as a reflection plane for reflectarray. By properly controlling each...
In this paper, a new classification scheme, which extracts the main scattering mechanism with target scattering similarities, is proposed. This approach not only leads to improved understanding of scattering mechanisms, but also has good performance in discriminating different scattering type of land cover. The NASA/JPL AIRSAR data is used for validating its effectiveness.
This paper proposes a novel dual frequency selective reflectarray that can control reflected beams independently at dual frequencies using two different polarizations. The reflectarray improves propagation by controlling the scattered beams to achieve high speed in broadband wireless mobile communication systems at a high frequency. The reflectarray comprises cross-dipole arrays and double square...
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...
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