基于低温共烧陶瓷(Low temperature co-fired ceramic,LTCC)技术设计了一款C波段超宽带、高抑制的带通滤波器,并通过LTCC技术对滤波器进行加工制作,满足了小体积、高性能、密集封装的应用需求.滤波器整体上采用了低通滤波器与高通滤波器串联的结构实现超宽通带,并引入传输零点来增加带外抑制,采用垂直叉指电容和双层螺旋电感来减少滤波器体积.最终实现的滤波器通带的中心频率为5.3 GHz,带宽为3 GHz,通带内插损小于0.8 dB,在DC～3 GHz处抑制达到了 36 dB,在8～14 GHz处抑制达到了 35 dB,通带回波损耗为12 dB.滤波器体积为:1.8 mm×1.0 mm×0.7 mm.

目的:为解决民用机载导航、野外应急救援等领域中设备定位精度不够与可靠性低等问题,设计了一种低成本、高定位精度、高可靠性的基于多全球导航卫星系统(Global Navigation Satellite Systems,GNSS)的定位装置.方法:该定位装置采用了GPS和BDS的双系统定位结构,增加了卫星可视数,提高了定位精度;可实现北斗短报文通信功能,可保证极端天气条件下的通信;同时对电源部分进行优化,减小了电源纹波和高频噪声.结果:对其定位精度进行测试及其在晴天无遮挡和雨天有遮挡物的情况下分别对装置进行连续4 h的十组短报文通信测试,实现了2 m以内高精度定位的且在晴天和雨天时能分别达到平均95％ 和89％ 以上的成功率.结论:与传统的单系统定位装置和双频GPS定位装置相比,本设计在低成本的前提下实现了高定位精度和高可靠性.

该文设计了基于低温共烧陶瓷(LTCC)技术的双波段高抑制、低损耗的双工器.该双工器由低通滤波器和带通滤波器组成,且在低、高频段的阻带抑制方面运用了传输零点理论,在实现双工器低损耗的同时,也实现了在多波段的高抑制,提升了双工器的性能.该双工器在低频段(0.68～0.95 GHz)及高频段(1.43～2.40 GHz)时插损均小于1.2 dB,但在1.43～2.40 GHz时双工器抑制大于20 dB,0.68～0.95 GHz时双工器抑制大于15 dB.在4.9～5.9 GHz时双工器抑制大于13 dB,具有良好的市场应用前景.

针对目前腔体三工器虽然功率容量大,但体积较大难以实现片上集成的问题,利用LTCC工艺设计了一种高隔离度小型化的三工器.采用的方法是设计3个电路块以解决阻抗匹配的问题.它们同时作为频率选择元件和匹配单元,当其中一个块用作传输通道时,其余两个在公共端提供无限输入阻抗,以防止信号进入三工器的无效部分.这使得构建块能够在输入端子处连接在一起,而无需其他匹配电路,大大简化了集成过程,提高了通道间的隔离度.此三工器在X波段(9.8 GHz～11.8 GHz)抑制达到-23 dB,优于目前常用的2.4G/5G射频芯片所需指标.

设计了一款基于低温共烧陶瓷(LTCC)工艺的小型化边沿陡峭低通滤波器.该滤波器通过网络综合法设计,利用ADS和HFSS联合仿真进行优化,结合传输零点理论,在阻带设计两个位置可调的零点,可增加阻带抑制,并且通过合理设置各个元件的位置和外形,形成陡峭边带.实际加工出的滤波器性能与仿真结果吻合.滤波器截止频率500 MHz,通带插入损耗小于0.55 dB;在0.9 GHz、1.3 GHz处产生两个传输零点;825 MHz处衰达到23 dB,1.71 GHz处衰减达到31 dB,形成了陡峭的边带特性.该滤波器已在蜂窝通信中得到应用.

该文通过低温共烧陶瓷(LTCC)技术设计了一款低损耗高抑制双工器.该双工器由LC结构低、高通滤波器组成,在双工器的两个频段中分别引入串、并联谐振产生传输零点,从而提高双工器的抑制效果与隔离度.所设计的双工器具有插入损耗低,隔离度高,阻带抑制高及尺寸小等特点.实验结果表明,双工器在低端(0.95～1.35 GHz)和高端(1.65～2.15 GHz)时插入损耗均小于2.5 dB,且在1.65～2.15 GHz与0.95～1.35 GHz时抑制大于23 dB,具有良好的应用前景.

提出一种低插损小型化LTCC带通滤波器的实现方法,该带通滤波器采用低温共烧陶瓷(LTCC)技术制作宽带滤波器,以用于第五代WiFi传输技术的研究.在性能上,利用相移特性设计相位差为180°的两条电流路径,从而形成反向隔离以实现陡峭带外抑制的目的.同时,在末端级联一个π型结构,达到阻抗匹配和加大X波段带外抑制的作用.通过研究电流的趋附效应选择合适的元器件银层厚度以进一步降低插损.经测试,滤波器的通带为4 500～6 500 MHz,插入损耗小于0.8 dB,回波损耗小于-15 dB,抑制了X波段的高通部分(9.8～11.8GHz)达到-25 dB.此滤波器最终尺寸大小仅为1.6 mm×0.8 mm×0.7 mm,可应用于5G WiFi模块.

设计了有一种基于低温共烧陶瓷(LTCC)工艺的小型化高性能带通滤波器.该滤波器采用集总参数形式,通过加入多级LC谐振,在滤波器近端增加多个传输零点来增加其在近端的抑制.经过电磁仿真优化,实际加工滤波器的测试结果与软件仿真相吻合.滤波器通带为5500 MHz~5900 MHz,其插入损耗小于2.5 dB,在5500 MHz抑制大于15 dB.该滤波器已经在一些WLAN模块中得到使用.

Designed a high isolation of coaxial cavity dual-frequency combiner,and used more cross coupling that increasing the transmission zeros of combiner,then the result of this designed isolation has upgrade. As to the struc?ture of common cavity between the two filters,combiner has more low-impact of frequency-bandwidth with tap-line. In order to verify the feasibility of the design,we produce a combiner with the structure for DSC Combiner. In the simulation and experimental using the combiner,the conclusion achieves specification requirements.

To meet the requirements of communication system for lower intermodulation,the contribution to passive intermodulation is analyzed and a dual-frequency ( CDMA800 and GSM900 ) combiner by using coaxial cavity de-signed . The coaxial cavity structure is presented using a method of circuit optimization simulation and full wave opti-mization simulation by simulation software Ansoft Designer and Ansoft Hfss. It is found that the measured result is consistent with the design after the combiner is manufactured and measured. So it has the very good application val-ue and prospect among the similar products.

A lowpass and highpass combiner worked at VHF band was designed and manufactured. K-m type filter was applied to promote the attenuation and rectangular coefficient of the filter. Optimized simulation on circuit model was obtained by software of Designer,at last a physical LC combiner with lower insertion loss and higher inhibition was manufactured based on the simulation model. The measured results show that the attenuation is above 79 dB and the insertion loss is less than 0.2 dB. Moreover,the filter has small size,simple structure,less use of LC compo-nents and high practical value.

设计了一种新型的滤波器,就是在传统的腔体滤波器中加入介质谐振腔,即金属腔体和介质腔体混合的一种结构.这种混合结构有着介质腔体的高介电常数,很小的频率温度系数以及极高的Q值的优点,同时也有着金属腔体易调试、结构稳定、体积小等好处.为了使滤波器拥有更好的带外抑制,我们还加入了较多的传输零点.通过仿真软件Genesys对滤波器电路模型进行设计,用HFSS对滤波器的单腔以及双腔进行仿真,从而确定了滤波器的尺寸.最后两种仿真结果基本一致,证明该设计的可行性.

采用盘耦合形式的同轴方形谐振腔结构,设计了一款中心频率为932 MHz,阻带带宽4MHz,阻带抑制-55dB的窄带带阻滤波器.在同轴腔结构与传输线之间引入耦合盘构成带阻滤波单元,使用Designer与HFSS软件对电路模型与3D结构模型进行仿真优化,最后根据仿真模型进行加工测试.实测结果与仿真结果基本吻合,在阻带边缘具有良好的边缘陡峭度.该滤波器结构简单,易调谐.

Calibration of the modulation quality as an important parameter of wireless communication, it played a vital role in the performance of wireless com-munications test. We proposed a auto-calibration method of digital modulation parameters of a digital mobile communication tester, against the unstable modulation parameters and high error rate of manually test, what's more, analyzed the uncertainty of the measurement results. The experiment results showed that the automatic test method was precision, high stability, and practical. ? Springer International Publishing Switzerland 2014.

以一种基于公共腔的新型同轴腔体双频合路器为研究对象,结合仿真技术进行研究.采用公共腔结构,大幅降低了合路输出端抽头线对每个通带的影响.通过电路仿真软件ANSOFT DESIGNER对合路器电路模型进行分析,再通过电磁场仿真软件ANSOFT HFSS建立合路器仿真模型并进行优化,得出合路器的参数指标,最后制作一款用于大功率移动信号基站的GSM收发天线前端的合路器.结果表明,该合路器仿真与实测结果基本相同,说明了基于公共腔结构合路器的实用性.

To solve so much test points,low efficiency of manual testing,test resource took up in a single instrument automatic test system,low utilization rate and other prolems in processing of different types of wireless communication instrument calibration,whose calibration method was similar,a universal automatic calibration system was designed to achieving communication between instruments and PC,setting parameters,processing test results and making a calibration certificate automatically.At last,a variety of wireless communication instruments could be calibrated automatically on the same platform through the universal automatic calibration system.Under Microsoft Visual Basic 6.0 programming environment in this paper,the system used modular design method which was based on GPIB(General-Purpose Interface Bus) interface.In addition,the pratical application showed that the system was pratical with strong scalability and high reliability.

Electromagnetic shielding effectiveness of metallic enclosure influences the EMC performance of EV-BMS (electric vehicle-battery management system). Electromagnetic leakage of electric equipment enclosure caused by apertures is a serious problem. In this chapter, the numerical simulation analysis for electromagnetic shielding performance of enclosure with apertures is performed based on Finite Element Method. Different shapes and orientation of aperture/slot bringing to shielding effectiveness and resonant frequency are analyzed, and analysis of the influence on the shielding performance of the enclosure by the different location of aperture is conducted as well. Meanwhile, some improving counter measures are proposed. By comparing different schemes of BMS metallic enclosure, the chapter provides guidelines for designing the enclosure.

By using the Babinet modeling theory and the finete element simulation software,the problem of slot radiation of enclosure is discussed.Firstly,the factor of the slot with different aspect ratio on radiation is analyzed,and that with different locations is analyzed too.Secondly,the method of inhibiting slot radiation is studied.

For sharing existing communication resource to meet the coverage of new communication system,a bandpass and bandstop combiner based on coaxial cavity is presented.Analyzing and simulating the circuit model of combiner,simulating and optimizing the structure of combiner with HFSS,finally a WLAN three-port combiner based on coaxial cavity is manufactured,making WLAN system merge into existing 2G/3G communication system successfully,and the measured results have good agreement with simulated results.Moreover,the combiner has many advantages such compact size,and easy-tuning,which are useful in practical applications.

In this paper, a novel three-port combiner based on coaxial cavity is presented, which consists of a band-pass filter with a transmission zero and a ultra-wideband band-stop filter, and the combiner is different to the conventional combiner based on microstrip or stripline. The design and simulated results show that the novel combiner has a good performance, which are insert loss more than -0.5dB and return loss less than -20dB between the GSM/DCS/TD band (800-2170MHz) and WLAN band (2400-2500MHz), the isolation in both bands less than -85dB, respectively. In addition, the performances of the novel combiner are demonstrated experimentally, the measured results have good agreement with simulated results.