微波站微电子设备的防雷措施

通过分析雷电对微电子设备的影响及雷害侵入微波站的方式，提出采用有效的防立击雷系统与由“分流-均压-屏蔽-接地-接口保护”相结合的系统防护方案，来保护微波站的电子设备。     

微波辐射在提金活性炭技术中的应用

概述了微波辐射在提金活性发技术中的应用，将微波辐射和传统方法制备提金炭技术进行了比较，论述了微波辐射在制备提金炭及其解吸技术中的研究进展，最后对微波辐射在提金活性炭技术中的应用作了简单的展望。     

ZST微波陶瓷在介质振荡器上的应用研究

用传统固相法制备ZST(氧化锆-氧化锡-氧化钛)系微波陶瓷,研究了ZST系微波陶瓷的组成对介电性能的影响。通过X-射线衍射(XRD)和HP8714ET网络分析仪对其晶体结构和微波介电性能进行研究,实验结果表明:少量掺Bi2O3的ZST系陶瓷材料可把烧结温度降低至1 260℃,微波介电性能较好;掺入量大于2%(质量分数)时,ZST系微波陶瓷在晶界偏析形成了Bi2Ti2O7新相,微波性能下降。用微波介电性能较好的ZST系陶瓷制成的介质振荡器进行测试,其电性能满足设计要求。     

微波感应式电力线防盗在线监测系统

研制了一种微波感应式配电线路防盗在线监测系统，简述了其系统构成、技术特点和应用效果。整个系统由监测分机、监控中心、巡检人员组成，借助该系统进行了一系列实验。结果表明，当有大型移动物体靠近或攀登杆塔时，安装在杆塔上10 m左右的微波感应监测分机感应到移动物体信号，一方面进行语音警示，另一方面通过短信服务及时向监控中心发送短信，监控中心及时通知巡检人员，赶到事故现场，以最大限度地保证输电线路的安全。     

数字微波无线通信系统中的中频自适应均衡器

在数字微波无线通信系统中，由于多径衰落引起码间干扰，使系统性能恶化，必须采用抗多径衰落的措施．中频频域均衡器（ＩＦＥ）由于结构简单而且经济，在衰落不十分严重的情况下性能良好，因而在数字微波系统中被广泛采用．本文比较了几种常用的ＩＦＥ，并着重对自适应谐振武中频均衡器的两种调节方法作了研究．模拟计算得到的ｓｉｇｎａｔｕｒｅ曲线表明，这种均衡器对非最小相位（ＭＭＰ）信道的传输性能有很大的改进，且两种调节法可达到相近的结果，如选择其中较简单的调节法，可以简化硬件结构．     

广义Foster定理

利用Ｍａｘｗｅｌｌ方程组导出了适用于有耗网络的广义Ｆｏｓｔｅｒ定理，得到了一些有关电抗斜率以及Ｑ值的有用公式及结论。     

SDH微波接力通信系统差错性能指标的分配和预测方法

本文根据ＩＴＵ－ＴＧ．８２６建议和ＩＴＵ－Ｒ有关文件，分析了Ｇ．８２６指标在ＳＤＨ微波接力通信系统中的分配方法；提出了ＳＤＨ微波接力通信系统差错性能指标的预测方法；介绍了在ＳＤＨ微波接力通信系统中主要的抗衰落措施及其对差错性能指标的改善效果。     

Microwave surface resistance of epitaxial YBa2Cu3O7 thin films at 18.7 GHz measured by a dielectric resonator technique

We used a dielectric resonator technique for highly sensitive measurements of the temperature dependence of the microwave surface resistanceR _s of 1×1 cm² superconducting films at 18.7 GHz. It consists of a sapphire disc positioned on the film under investigation within a copper cavity which is acting as a radiation shield. In the TE₀₁ oscillation mode the highly reproducible quality factor of about 10⁵ results in a sensitivity of ±50 forR _s measurements. The temperature dependence ofR _s can be measured up to values as high as 1 . We have investigated several YBa₂Cu₃O₇ thin films prepared by high oxygen pressure d.c. sputtering on LaAlO₃ and NdGaO₃. Our best films exhibit a pronounced nonlinear behavior of the d.c. resistivity(T) with(300K)/(100K) values of about 3.7. Those films show, besides the initial fall-off just belowT _c , a further strong decrease ofR _s at low temperatures. This was observed both at 18.7 GHz and 87 GHz, as measured by a conventional cavity end plate replacement technique. ForTT_c/2 these films exhibit an exp (–T _c/T) dependence ofR _s with-values around 0.4. These observations may be explained by a superconducting energy gap with 2/kT _c0.8 for charge carriers localized in the CuO chains for YBa₂Cu₃O₇.     

Global insight into microwave stoneware firing: Macro and microstructural changes

Industrial competition and environmental concerns lead to the exploration of alternative and energy-efficient technologies for ceramic materials processing. The main objective of this work was to present microwave heating as a viable option for stoneware processing. Stoneware functional properties are presented and discussed, with emphasis on impact strength, water absorption, porosity, and color. Microstructure analyses show that microwave- and gas-fired samples have higher densifications than electrically fired samples. A relevant finding for processing conditions is that microwave firing requires temperatures approximately 100°C lower than those required by conventional firing. Microwave-fired samples’ rupture energies are approximately twice (0.57 ± 0.06 (J)) those of the reference samples (0.26 ± 0.03 (J)), and their water absorptions are approximately one-half (1.5% at 1170°C and 0.8% at 1190°C) of those of the reference samples (2.0%), whereas the water absorption of electrically fired samples at 1180°C has been estimated to be 7.5%. Color analysis also evidences a shift to lower microwave firing temperatures, what is attributed to the enhanced transformations promoted by microwave heating when comparing with the transformations promoted by conventional (gas or electric) heating.