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High-Efficiency Wideband Transmitarray Antenna Using Polarization-Rotating Elements with Parasitic Stubs

Chinese Journal of Electronics 2024年第2期33卷 496-503页

作者： Xi WANG Yuandan DONG University of Electronic Science and Technology of China

A high-efficiency polarization-rotating transmitarray antenna(TA) using wideband elements is proposed for millimeter-wave applications. The polarization-rotating element consists of three metallic layers and two substrates. Orthogonal polarizers are employed on the top and bottom of the element. And the split ring with a parasitic stub on the middle layer is symmetric about the diagonal, performing the polarization rotation and phase compensation simultaneously. A parasitic stub is designed to decrease transmission loss and broaden the bandwidth. The periodicity of the element is only 1/4 wavelength at 30 GHz. A prototype TA with 28 × 28 elements is designed, fabricated, and measured. The measured peak gain reaches 27.5 d Bi at 37.8 GHz. The 1-d B gain drop bandwidth is 30.8–40 GHz(26.0%).The aperture efficiency reaches as high as 71% at 31.5 GHz. Within the bandwidth of 26.5–38.8 GHz(37.7%), the aperture efficiency is higher than 50%. The proposed polarization-rotating TA features wide bandwidth and high efficiency, demonstrating great application potential for 5G millimeter-wave communication.

关键词： Wavelength measurement transmitting antennas Prototypes Apertures Gain measurement Propagation losses Broadband antennas

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Performance Study of MIMO-OSTBC Parallel Relay FSO System Based on GFDM

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Chinese Journal of Electronics 2024年第2期33卷 564-572页

作者： Rui ZHOU Yong WANG Yi WANG Key Laboratory of Electromagnetic Wave Information Technology and Metrology of Zhejiang Province College of Information Engineering China Jiliang University State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai University

This paper investigates the performance of a new generalized frequency division multiplexing(GFDM)parallel relay free space optical(FSO) communication system using multi-input multi-output(MIMO) orthogonal space-time block codes(OSTBC) scheme. Under the M distribution atmospheric turbulence, taking into account the triple effects of irradiance, pointing errors and path loss, the mathematical expression of system symbol error rate is derived with the help of Meijer G-function. The symbol error performance of GFDM is compared with on-off keying,Gaussian minimum shift keying, polarization shift keying and orthogonal frequency division multiplexing(OFDM)modulation methods. The effects of the MIMO-OSTBC parallel relay scheme on the GFDM system including filter roll down coefficient, the number of transmitting and receiving antennas, the number of relays, normalized beamwidth and jitter variance are analyzed, and the numerical results are verified by Monte Carlo simulation. This work provides a good foundation for engineering applications.

关键词： Monte Carlo methods transmitting antennas Symbols Receiving antennas Modulation Jitter Transceivers

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Blind Signal Reception in Downlink Generalized Spatial Modulation Multiuser MIMO System Based on Minimum Output Energy

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Chinese Journal of Electronics 2024年第2期33卷 504-515页

作者： Wei-Chiang WU College of Mechanical and Electrical Engineering Sanming University

This paper considers downlink multiuser multiple-input-multiple-output system with parallel spatial modulation scheme, in which base station transmitter antennas are separated into K groups corresponding to K user terminals. Generalized spatial modulation is employed, in which a subset(more than single antenna) of transmit antenna array are activated and the activating pattern corresponds to specific spatial symbol. Different from existing precoding-based algorithms, we develop a two-stage detection scheme at each user terminal: In the pre-processing stage, a minimax algorithm is proposed to identify the indices of active antennas, where the key idea is that the minimum output energy of the detector is maximized; A constrained minimum output energy algorithm is proposed in the post-processing stage to mitigate multiuser interference and extract temporal symbols. Compared with existing precoding-based algorithms, the complexity is significantly reduced. Moreover, the proposed algorithm is semi-blind,in which only a small subset of channel state information is required to identify active antennas as well as eliminate multiuser interference. Simulation results demonstrate that the proposed algorithm is near-far resistant and the spectral efficiency is extensively increased compared to the conventional spatial modulation scheme.

关键词： GSM Spectral efficiency Computer network reliability transmitting antennas Modulation Symbols Downlink

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Automatic Test System of the Antenna Characteristic

Automatic Test System of the Antenna Characteristic

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2002 3rd International Symposium on Electromagnetic Compatibility

作者： WU Ran WEN Yinghong ZHOU Kesheng EMC Research section Northern JiaoTong University

ISBN: (纸本)0780372778

＜正＞Antenna is a component used to transmit or receive electric wave in wireless communicating *** the transmitting terminal its primary function is to change electrical current of high frequency transmitted by transmitter or transmission line into wireless wave and transmit it into space;at the receiving terminal it change the energy of the wireless wave into electrical current. Then,we can regard antenna as transforming equipment between conducting waves and radiate *** has an important influence on normal working of wireless communication,broadcast,orientation and telemetry *** has influence on EMC as important as which it has on *** EMC emission measurements,EMI testing and EMS testing included;antenna acts as the receiving component and the transmitting component *** is the important equipment that receiving the energy of radiation and it also is the important equipment that sends electromagnetic signal to the object that being ***, if there is no antenna,we cannot go on our EMC testing. Any antenna has some characteristic parameters,which can be used to estimate this antenna’s *** characteristic parameters include antennas impedance, directional property,antenna gain,posture,and antenna’s polarization characteristic,which determine an antenna is fine and the area it can be used ***,these characteristic parameters have a great influence on the measuring result and some area it used in. As every worker of EMC testing known,it is very difficult that measure an antenna’s characteristic parameters,and some of which are even not measured by the current *** people try to measure them,but it takes much time and labor testing with conventional testing method（*** by hand）.What’s more,it is easily to bring testing *** with the high development of computer and the emergence of advanced testing equipments,it is necessary and possible to design a convenient automatic testin

关键词： transmitting antennas receiving antennas antenna testing automatic test equipment microstrip antennas automatic test system electric wave wireless communicating system transmitting terminal receiving terminal transforming equipment EMC EMS EMI receiving component transmitting component impedance directional property antenna gain posture polarization characteristic

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Improvement of the SSR mode S data link using a distributed groundsystem

Improvement of the SSR mode S data link using a distributed ...

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1996 CIE International Conference of Radar(ICR’96)

作者： J.Tol P.van Genderen L.P.Ligthart Delft University of Technology Department of Electrical Engineering International Research Centre for Telecommunications-transmission and Radar(IRCTR)Mekelweg 42628 CD DelftThe Netherlands

In Air Traffic Control extensive use is planned of data links. One of the major candidates is the data link capability of SSR mode *** data link capability of SSR mode S however is rather limited when using conventional rotating antennas with a short and fixed time-on-target,and a long time interval between two successive beam *** results in a high access delay and too long transaction times for long messages consisting of several ELM frames. The paper presents a method for the analysis of the cause of reply losses,and then discusses a novel approach to the data link’s short comings,while maintaining the surveillance capability:the substitution of a number of interrogators with a rotating antenna by a distributed network of(listen-only)SSR mode S ground system receivers and a transmitter. The results show that the mode S transponders suffer from a high reply loss,by occupancy due to mode A/C interrogations, and shows that the novel approach offers adequate data link performance while maintaining the reply loss numbers at an acceptable low probability.

关键词： Surveillance Air traffic control Aircraft Delay transmitting antennas Transponders Aerospace electronics Phased arrays Radar antennas Propagation losses

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Performance evaluation of various MIMO decoders for IEEE 802.11n WLAN system

Performance evaluation of various MIMO decoders for IEEE 802...

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2006 10th International Conference on Communication Technology（ICCT 2006）

作者： Jungho Yoo Jin Lee Sin-Chong Park School of Engineering Information and Communications University 119 Munjiro Yuseong-gu Daejeon 305-732 Korea

In this paper, we present the performance evaluation of MIMO decoders for IEEE 802.11n high-speed WLAN system. The performance of Zero Forcing decoder, Minimum Mean Square Error decoder and Sphere decoder is evaluated by computer simulation in terms of packet error rate. The simulation results show that Sphere decoder has the best performance, Minimum Mean Square Error decoder has intermediate performance, and Zero Forcing decoder has the worst performance.

关键词： MIMO Wireless LAN Maximum likelihood decoding Mean square error methods Computational complexity Transmitters Computer simulation transmitting antennas Throughput Error correction codes

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