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Antenna Decoupling Based on Characteristic Modes Cancellation

Chinese Journal of Electronics 2022年第6期31卷 1138-1145页

作者： chu qingxin ZENG Wenfeng School of Electronic and Information Engineering South China University of Technology

The demand for a high transmission data rate in 5G leads to the wide application of the multi-input, multi-output(MIMO) technique. However, the narrow design space in mobile phone causes severe unexpected coupling between antenna units and deteriorate the system performance dramatically. In this paper, we focus on the antenna coupling within the MIMO system. Some decoupling techniques are summarized, such as neutralization line, decoupling network, common/differential mode cancellation, etc. Finally, new decoupling research developments of modal currents cancellation based on the theory of characteristic mode are elaborated. Two design examples are shown to validate the benefit of the proposed decoupling method. The-6 dB impedance bandwidth of the head-to-head antenna pair can cover 3.4–3.6 *** isolation level is improved from more than 3.7 dB to more than 13 dB. The tail-to-tail antenna pair can cover 3.3–5 GHz and the isolation level is improved from more than 5 dB to more than 10 dB in the whole operating bandwidth. Both antenna pairs can achieve an envelop correlation coefficient of less than 0.2 and the antenna efficiencies are more than 40%.

关键词： neutralization line severe unexpected coupling mobile phone antenna pairs 3.3-5 GHz antenna units antenna radiation patterns narrow design space high transmission data rate mobile handsets multiinput MIMO system multioutput technique 5G mobile communication characteristic mode decoupling method 6 dB impedance bandwidth antenna efficiencies antenna coupling MIMO communication system performance antenna decoupling modal currents cancellation characteristic modes cancellation isolation level tail-to-tail antenna pair head-to-head antenna pair decoupling research developments decoupling techniques

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Effective capacity of cognitive radio systems in asymmetric fading channels

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The Journal of China Universities of Posts and Telecommunications 2015年第3期22卷 18-25页

作者： Shi Xiangqun chu qingxin School of Electronic and Information Engineering University of Electronic Science and Technology of China Zhongshan Institute School of Electronic and Information Engineering South China University of Technology

As known that the effective capacity theory offers a methodology for exploring the performance limits in delay constrained wireless networks, this article considered a spectrum sharing cognitive radio （CR） system in which CR users may access the spectrum allocated to primary users （PUs）. Particularly, the channel between the CR transmitter （CR-T） and the primary receiver and the channel between the CR-T and the CR receiver （CR-R） may undergo different fading types and arbitrary link power gains. This is referred to as asymmetric fading. The authors investigated the capacity gains achievable under a given delay quality-of-service （QoS） constraint in asymmetric fading channels. The closed-form expression for the effective capacity under an average received interference power constraint is obtained. The main results indicate that the effective capacity is sensitive to the fading types and link power gains. The fading parameters of the interference channel play a vital role in effective capacity for the looser delay constraints. However, the fading parameters of the CR channel play a decisive role in effective capacity for the more stringent delay constraints. Also, the impact of multiple PUs on the capacity gains under delay constraints has also been explored.

关键词： effective capacity delay quality-of-service constraint asymmetric fading channels cognitive radio systems

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Stability analysis of the extended ADI-FDTD technique including lumped models

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Science in China(Series F) 2008年第10期51卷 1607-1613页

作者： CHEN ZhiHui chu qingxin College of Electronic and Information Engineering South China University of Technology Guangzhou 510640 China

The numerical stability of the extended alternating-direction-implicit-finite-difference-time-domain （ADI-FDTD） method including lumped models is analyzed. Three common lumped models are investigated： resistor, capacitor, and inductor, and three different formulations for each model are analyzed： the explicit, semi-implicit and implicit schemes. Analysis results show that the extended ADI-FDTD algorithm is not unconditionally stable in the explicit scheme case, and the stability criterion depends on the value of lumped models, but in the semi-implicit and implicit cases, the algorithm is stable. Finally, two simple microstrip circuits including lumped elements are simulated to demonstrate validity of the theoretical results.

关键词： ADI-FDTD extended algorithm lumped model numerical stability

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Novel Diplexer with Improved Isolation Using Asymmetric Transmission Zeros Technique

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Chinese Journal of Electronics 2016年第3期25卷 591-594页

作者： CHEN Fuchang HU Haotao QIU Jieming GUO Mofei chu qingxin School of Electronic and Information Engineering South China University of Technology School of Electronics Electrical and Systems Engineeringthe University of Birmingham

High isolation and compact size diplexer with two cascaded triplet sections is presented in this paper. By using the quarter-wavelength resonators and stepped impedance resonator to form cascaded triplets,size reduction is achieved. By exploiting different coupling between the resonators, multiple transmission zeros can be obtained to improved the isolation between the two channels. An experimental diplexer with lower and upper channels centered at 1.8GHz and 2.2GHz is designed to verify the proposed theory. Without extra matching network, the proposed diplexer shows high isolation of greater than 41dB.

关键词： Diplexer Bandpass filter Microstrip Transmission zero Isolation

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High Selectivity Cascaded Quadruplet Bandpass Filter with Three Pairs of Transmission Zeros

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Chinese Journal of Electronics 2017年第5期26卷 1101-1104页

作者： CHEN Jianfeng CHEN Fuchang LI Runshuo XIE Zeming chu qingxin School of Electronic and Information Engineering South China University of Technology

A novel microstrip Cascaded quadruplet(CQ) bandpass filter using quarter wavelength resonators and three-quarter wavelength resonators is *** on cross coupling and source-load coupling,three pairs of finite transmission zeros are generated at the *** a result,the out-of-band rejection can be enhanced and high selectivity is *** on the proposed structure,a cascaded quadruplet filter centering at 3.0GHz is designed and *** agreement between the measured and simulated data is obtained.

关键词： Cascaded quadruplet(CQ) Bandpass filter Cross coupling Transmission zeros Microstrip

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Design of UWB bandpass filter with dual notched bands

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Science China(Information Sciences) 2012年第6期55卷 1436-1440页

作者： chu qingxin & TIAN XuKun School of Electronic and Information Engineering,South China University of Technology,Guangzhou 510640,China School of Electronic and Information Engineering South China University of Technology Guangzhou China

An ultra-wideband (UWB) bandpass filter (BPF) with dual sharply rejected notch-bands to elim-inate the interference from coexisting radio systems is presented in this *** characteristics of the proposed notched structure are investigated using simulations to demonstrate the design flexibility of the notch-band *** integrating the proposed notched structure into the basic UWB BPF based on a stepped-impedance stub loaded resonator (SISLR),a UWB BPF with dual sharply rejected notched bands at 5.2 and 5.8 GHz is ***,the designed filter is built and *** simulated and measured results are found to be in good agreement to verify the proposed design.

关键词： bandpass filter bandstop units notched bands ultra-wideband

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计算微波有耗问题的增量参数法

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西安电子科技大学学报 1989年第1期16卷 26-31页

作者：褚庆昕西安电子科技大学电磁场工程系

本文在“增量电感法”,“增量频率法”和“广义增量频率法”的基础上,利用微扰理论,提出了计算非TEM模传输线的衰减常数的“增量传输常数法”,从而形成了一套比较完整的计算微波有耗问题的新方法——增量参数法。

关键词：波导传输线衰减常数微扰增量

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个人车险业务感知服务质量对顾客满意的影响力差异研究

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南京社会科学 2010年第8期 29-37页

作者：乔均褚庆鑫南京财经大学营销物流学院教授南京210046 南京大学商学院博士生南京210046

多年以来我国车险行业的恶性价格竞争引发的一系列市场违规、理赔纠纷已经严重影响了保险业的正常经营,甚至导致消费者对保险业产生了质疑态度。如何提升感知服务质量从而提高顾客满意度,让忠诚维系顾客成为了保险行业竞争的重要维度。... 详细信息

多年以来我国车险行业的恶性价格竞争引发的一系列市场违规、理赔纠纷已经严重影响了保险业的正常经营,甚至导致消费者对保险业产生了质疑态度。如何提升感知服务质量从而提高顾客满意度,让忠诚维系顾客成为了保险行业竞争的重要维度。本文以中国人寿财险公司南京分公司为例,针对车险业务感知服务质量对顾客满意的影响力差异进行了定量研究。此研究检验和修正了PZB提出的SERVQUAL量表在中国汽车保险行业中的适用性,并且弥补了汽车保险行业对感知服务质量没有实证研究的遗憾。

关键词：感知服务质量顾客满意度个人车险业务

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基于多模滤波器概念的宽带天线设计

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电波科学学报 2018年第4期33卷 373-379页

作者：褚庆昕罗宇郑东泽吴锐华南理工大学广州510640

提出了一种基于多模滤波器概念的宽带天线设计方法.多模宽带滤波器的研究已有多年的历史.本质上讲,谐振天线的辐射单元也是谐振器,同样存在着多个模式.因此,多模滤波器的概念和方法完全可以应用于宽带谐振天线的设计.文中给出了所提出... 详细信息

提出了一种基于多模滤波器概念的宽带天线设计方法.多模宽带滤波器的研究已有多年的历史.本质上讲,谐振天线的辐射单元也是谐振器,同样存在着多个模式.因此,多模滤波器的概念和方法完全可以应用于宽带谐振天线的设计.文中给出了所提出的多模宽带天线的原理,并通过支节加载偶极子演示了典型的设计方法.仿真和测试结果表明,所设计的天线在几乎不影响尺寸的情况下有效地实现了宽带特性.

关键词：多模宽带天线谐振天线支节加载偶极子多模滤波器

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GENERALIZED INCREMENTAL FREQUENCY RUI E FOR COMPUTING Q-FACTOR OF A MICROWAVE RESONATOR

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Chinese Science Bulletin 1988年第9期33卷 789-791页

作者：褚庆昕 Department of Electromagnetic Field Engineering Northwest Telecommunication Engineering Institute Xi'an

In microwave engineering and the application of microwave energy, computation of the Q-factor of a microwave resonator is very important. This work will be very difficult when the geometric structure or the field distribution of the resonator is complicated. Therefore, attentions have been paid to searching simple and useful methods for the problem. In 1984, D. Kajfez presented the incremental frequency rule

关键词： resonator microwave searching dielectric incremental walls stored assumed mounted letter

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