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A dual-polarized Fabry–Pérot antenna with high gain and wide bandwidth for millimeter-wave applications

Qingyi Guo, Hang Wong,guo_qingyi@163.com,hang.wong@cityu.edu.hk

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 4,   Pages 599-608 doi: 10.1631/FITEE.2000514

Abstract: We introduce a dual-polarized (DP) rot cavity (FPC) antenna operating at the millimeter-wave (mmWave) frequency band with and characteristics. A DP feeding source and a partially reflective surface (PRS) integrated with a Fresnel zone lens are suggested to realize dual-polarization wave radiation over a wide impedance bandwidth. The feeding source provides vertical and horizontal polarizations while keeping high isolation between the two polarizations. PRS is used to realize Fabry cavity to produce a directive beam radiation. The integrated Fresnel zone rings are introduced for phase correction, leading to a significant gain enhancement for the antenna. For verification, a 60-GHz FPC antenna prototype with DP radiation is designed and fabricated with measurement results. It consists of a feeding source, a PRS integrated with a Fresnel zone lens, a quasi-curved reflector, and four three-dimensional printed supporters. The results illustrate that the peak gains of vertical and horizontal polarizations are 18.4 and 17.6 dBi, respectively. The impedance matching bandwidth for the two polarizations is 14%. The performance ensures that the proposed DP FPC antenna is a promising candidate for the fifth-generation wireless communication systems in the mmWave band.

Keywords： 双极化；法布里—珀罗腔天线；与菲涅耳带透镜集成的部分反射面；毫米波波段；高增益；宽带    

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High-gain Sliding Mode Output Tracking for Nonlinear Systems

Wang Xinhua,Chen Zengqiang,Yuan Zhuzhi

Strategic Study of CAE 2004, Volume 6, Issue 2,   Pages 38-43

Abstract:

An observer based on external and internal dynamics is designed, making the error between observing value and factual value to zero. Moreover, a continuously high-gain sliding mode controller is presented by using a sliding mode state which can make the error between the output and reference signal converge to zero. The analysis of stability and the result of simulation indicate that the controller designed has strong robustness and rapid convergence.

Keywords： nonlinear systems     external dynamics     internal dynamics     sliding mode control     robustness    

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Wideband and high-gain BeiDou antenna with a sequential feed network for satellite tracking Research Article

Zhuolin DENG, Zhongyu TIAN, Chenhe DUAN, Pei XIAO, Zhu LIU, Gaosheng LI,Gaosheng7070@vip.163.com

Frontiers of Information Technology & Electronic Engineering 2023, Volume 24, Issue 10,   Pages 1471-1481 doi: 10.1631/FITEE.2200244

Abstract: BeiDou-3 navigation satellite system was officially opened in 2020. While bringing high-performance services to people around the world, the navigation system requires well-designed s. In this paper, we propose a wideband circularly polarized high-performance . The antenna realizes through a , and the phase imbalance of the feed network from 1.05 to 1.80 GHz is less than 7°. The manufactured antenna demonstrates a return loss of more than 13 dB and an axial ratio3 dB over the entire global navigation satellite system (GNSS) frequency band. The right-handed circular polarization (RHCP) gain of the proposed antenna is greater than 4 dB in the GNSS low-frequency band and can reach more than 7.1 dB in the high-frequency band. Dimension of the proposed antenna is 120 mm×120 mm×20 mm, i.e., 0.54×0.54×0.09, where is the wavelength of the center frequency. The proposed antenna connected to a GNSS receiver has tracked 12 BeiDou satellites with ratios of GNSS signals greater than 30 dB. Such a high-performance antenna provides a basis for high-quality positioning services.

Keywords： BeiDou antenna     Wideband circularly polarized radiation     Four-port sequential feed network     Global navigation satellite system (GNSS) receiver     Satellite tracking    

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Frequency-domain-based Robustness Analysis for PID Generalized Predictive Control

Wang Fanzhen,Chen Zengqiang,Yao Xiangfeng,Yuan Zhuzhi

Strategic Study of CAE 2006, Volume 8, Issue 10,   Pages 66-70

Abstract:

The closed-loop feedback structure of PID generalized predictive control (PID - GPC) is proposed, then small-gain criterion is used to obtain a sufficient condition for the robust stability of PID - GPC under the condition of model-plant mismatch ( MPM) . Further more, the influence of PID - GPC parameter tuning on its robustness is analyzed in frequency domain.

Keywords： predictive control     robustness     frequency domain     small-gain criterion     PID control    

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Fairness analysis of extra-gain guilty of a non-repudiation protocol Research Articles

Xu GUO

Frontiers of Information Technology & Electronic Engineering 2022, Volume 23, Issue 6,   Pages 893-908 doi: 10.1631/FITEE.2100413

Abstract:

Many traditional applications can be refined thanks to the development of blockchain technology. One of these services is , in which participants in a communication process cannot deny their involvement. Due to the vulnerabilities of the protocols, one of the parties involved in the communication can often avoid rules and obtain the expected information to the detriment of the interests of the other party, resulting in adverse effects. This paper studies the fairness guarantee quantitatively through . E-fairness is measured by modeling the protocol in probabilistic timed automata and verifying the appropriate property specified in the probabilistic computation tree logic. Furthermore, our analysis proposes insight for choosing suitable values for different parameters associated with the protocol so that a certain degree of fairness can be obtained. Therefore, the reverse question—for a certain degree of fairness ε, how can the protocol parameters be specified to ensure fairness—is answered.

Keywords： Non-repudiation     Fairness analysis     Probabilistic model checking     PRISM    

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Real-Time Four-Dimensional Trajectory Generation Based on Gain-Scheduling Control and a High-Fidelity Aircraft Model Article

Olusayo Obajemu, Mahdi Mahfouf, Lohithaksha M. Maiyar, Abrar Al-Hindi, Michal Weiszer, Jun Chen

Engineering 2021, Volume 7, Issue 4,   Pages 495-506 doi: 10.1016/j.eng.2021.01.009

Abstract:

Aircraft ground movement plays a key role in improving airport efficiency, as it acts as a link to all other ground operations. Finding novel approaches to coordinate the movements of a fleet of aircraft at an airport in order to improve system resilience to disruptions with increasing autonomy is at the center of many key studies for airport airside operations. Moreover, autonomous taxiing is envisioned as a key component in future digitalized airports. However, state-of-the-art routing and scheduling algorithms for airport ground movements do not consider high-fidelity aircraft models at both the proactive and reactive planning phases. The majority of such algorithms do not actively seek to optimize fuel efficiency and reduce harmful greenhouse gas emissions. This paper proposes a new approach for generating efficient four-dimensional trajectories (4DTs) on the basis of a high-fidelity aircraft model and gainscheduling control strategy. Working in conjunction with a routing and scheduling algorithm that determines the taxi route, waypoints, and time deadlines, the proposed approach generates fuel-efficient 4DTs in real time, while respecting operational constraints. The proposed approach can be used in two contexts: ① as a reactive decision support tool to generate new trajectories that can resolve unprecedented events; and ② as an autopilot system for both partial and fully autonomous taxiing. The proposed methodology is realistic and simple to implement. Moreover, simulation studies show that the proposed approach is capable of providing an up to 11% reduction in the fuel consumed during the taxiing of a large Boeing 747 jumbo jet.

Keywords： Aircraft model     Intelligent taxiing     Optimization     Four-dimensional trajectory    

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Performance research on anti-noise FM jamming of pseudo-random code phase modulation and sine FM combined fuze

Tu Youchao,Zhao Huichang,Zhou Xingang

Strategic Study of CAE 2009, Volume 11, Issue 9,   Pages 68-73

Abstract:

Development and application of pseudo-random code combined fuze can be guided in theory by researching its anti-jamming performance. The anti-noise FM jamming performance of pseudo-random code phase modulation and sine FM combined fuze is analyzed based on the criterion of signal to jamming ratioin (SJR) gain in this paper. First, the principle of the combined fuze was introduced, and its overall SJR gain is reduced in detail under the noise FM jamming, then, the factors affecting its anti-noise FM jamming performance were analyzed, such as the nth order Bessel function of the first kind, Doppler frequency, pseudo-random code period, pulse width, and spot error. The results provide the important theoretic foundation for the improvement on anti-noise FM jamming performance of the combined fuze. At the same time, the studying method put forward in this paper may be used as the reference for analyzing anti-jamming performance of other type of fuzes.

Keywords： pseudo-random code     fuze     sine FM     SJR gain     anti-jamming    

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Constant-gain nonlinear adaptive observers revisited: an application to chemostat systems Research Articles

Jorge A. Torres, Arno Sonck, Sergej Čelikovský, Alma R. Dominguez,jtorres@ctrl.cinvestav.mx,gsonck@ctrl.cinvestav.mx,celikovs@utia.cas.cz,adomin@cinvestav.mx

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 1,   Pages 1-140 doi: 10.1631/FITEE.2000368

Abstract: This study deals with constant-gain for nonlinear systems, for which relatively few solutions are available for some particular cases. We introduce an asymptotic observer of constant gain for nonlinear systems that have linear input. This allows the observer design to be formulated within the linear matrix inequality paradigm provided that a strictly positive real condition between the input disturbance and the output is fulfilled. The proposed observer is then applied to a large class of nonlinear dynamical systems that are widely used in the fermentation process, cell cultures, medicine, etc. In fact, under standard practical assumptions, the necessary change of the state coordinates exists, allowing use of the constant-gain observer. Finally, the developed theory is illustrated by estimating pollutant concentration in a wastewater treatment facility.

Keywords： Nonlinear observers     Adaptive observers     Coordinate change     Chemostat     Pollutant observation    

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Title Author Date Type Operation

A dual-polarized Fabry–Pérot antenna with high gain and wide bandwidth for millimeter-wave applications

Qingyi Guo, Hang Wong,guo_qingyi@163.com,hang.wong@cityu.edu.hk

Journal Article

High-gain Sliding Mode Output Tracking for Nonlinear Systems

Wang Xinhua,Chen Zengqiang,Yuan Zhuzhi

Journal Article

Wideband and high-gain BeiDou antenna with a sequential feed network for satellite tracking

Zhuolin DENG, Zhongyu TIAN, Chenhe DUAN, Pei XIAO, Zhu LIU, Gaosheng LI,Gaosheng7070@vip.163.com

Journal Article

Frequency-domain-based Robustness Analysis for PID Generalized Predictive Control

Wang Fanzhen,Chen Zengqiang,Yao Xiangfeng,Yuan Zhuzhi

Journal Article

Fairness analysis of extra-gain guilty of a non-repudiation protocol

Xu GUO

Journal Article

Real-Time Four-Dimensional Trajectory Generation Based on Gain-Scheduling Control and a High-Fidelity Aircraft Model

Olusayo Obajemu, Mahdi Mahfouf, Lohithaksha M. Maiyar, Abrar Al-Hindi, Michal Weiszer, Jun Chen

Journal Article

Performance research on anti-noise FM jamming of pseudo-random code phase modulation and sine FM combined fuze

Tu Youchao,Zhao Huichang,Zhou Xingang

Journal Article

Constant-gain nonlinear adaptive observers revisited: an application to chemostat systems

Jorge A. Torres, Arno Sonck, Sergej Čelikovský, Alma R. Dominguez,jtorres@ctrl.cinvestav.mx,gsonck@ctrl.cinvestav.mx,celikovs@utia.cas.cz,adomin@cinvestav.mx

Journal Article