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- 2018
- quadruple band antenna
- 5G mobile communication
- channel capacity
- mobile antennas
- MIMO antenna
- Optoelectronic Information Science and Engineering
- Huawei Technologies Co., Ltd.
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Design of an Asymmetrical Quadruple-ridge Flared Horn Feed: a Solution to Eliminate Polarization Discrepancy in the Offset Reflecting Systems
摘要： Quadruple-ridge Flared Horns (QRFHs) have been showing qualified performance as the feed antennas for the reflecting systems in the Square Kilometre Array (SKA). However, due to the offset optics of the SKA reflecting system, identical illuminations from dual polarizations of the feed would result in different system performance. This difference would become more severe towards high frequencies and may cause the worse polarization unqualified for the desired specification. In this paper, an asymmetrical QRFH feed working over SKA Band B (covering frequencies 4.6–24 GHz) is proposed and optimized to tackle this problem. The asymmetrical Band-B feed is composed of two different and orthogonal pairs of both ridges and sidewall quad-pieces, so as to provide orthogonal polarizations but different illuminations. Simulated results show that, by this asymmetrical design different illuminations can be provided for two polarizations, and the polarization discrepancy has been eliminated over most of the bandwidth. Benefitting from the elimination, both polarizations of the Band-B feed have now achieved the SKA specification in terms of aperture efficiency.
关键词： polarization discrepancy,offset reflector antenna,quadruple-ridge flared horn
更新于2025-09-23 15:23:52
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Preorganized helical chirality controlled homochiral self-assembly and circularly polarized luminescence in a quadruple-stranded Eu2L4 helicate
摘要： The homochiral quadruple-stranded helicate, ΔΔ-(Eu2L4) assembled from the bis-β-diketone with the preorganized helical chirality shows strong circularly polarized luminescence.
关键词： preorganized helical chirality,circularly polarized luminescence,homochiral,bis-β-diketone,quadruple-stranded helicate
更新于2025-09-19 17:13:59
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[IEEE 2019 International Conference on Intelligent Sustainable Systems (ICISS) - Palladam, Tamilnadu, India (2019.2.21-2019.2.22)] 2019 International Conference on Intelligent Sustainable Systems (ICISS) - Modeling and Simulation of Multi-junction TANDEM Solar Cell
摘要： This paper manages with the modelling of quadruple junction solar cell (qjsc) constructed by using the semiconductor material of AlGaInP-GaAs-GaInAs-Ge at a particular value solar irradiance, temperature. Comparison of output I-V and P-V curve of quadruple junction solar cell is done with triple junction solar cell made up of InGaP-InGaAs-Ge semiconductor material and also single junction solar cell (sjsc) made of a Ge semiconductor by using MATLAB/SIMULINK. It has been found higher value of output voltage and power in quadruple junction solar cell as compared to single, dual or triple junction solar cell. The above described quadruple junction solar cell is made by using the material having a same lattice structure which helps to ease the flow of current in all the four junctions and analysis is done at solar irradiance (1000-800-500) W/cm2. The whole analysis is done through pessimistic approach on the basis of the single exponential model.
关键词： MATLAB Simulink,multi-junction solar cell,quadruple
更新于2025-09-12 10:27:22
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Compact Quadruple Band MIMO Antenna for 5G Mobile Applications
摘要： A design of compact quadruple band MIMO antenna for 5G mobile applications is proposed. The MIMO antenna consists of 8 antenna elements, each two of them are symmetrically placed on the orthogonal frame corners of the substrate, closely located to each other and connected by a short neutral line. Each antenna element consists of two feeding ports which operate at different frequencies. One feeding port operates at 3.5-3.9 GHz and the other feeding port operates at three bands, which are 2.3-2.5 GHz, 3.3-3.5 GHz and 4.25-4.45 GHz. The radiation efficiencies of all four bands are above 50% and ECC of the antenna elements are below 0.2, the calculated ergodic channel capacities with a 20 dB SNR at four bands reach to 87% of the ideal case at 3.6 GHz, 87.5% at 2.4 GHz, 82.7% at 3.4 GHz and 83.2% at 4.3 GHz, respectively, which are close to the ideal case of 8×8 MIMO system.
关键词： quadruple band antenna,5G mobile communication,channel capacity,mobile antennas,MIMO antenna
更新于2025-09-04 15:30:14