平行板波导CTS 天线的设计与分析

采用传输线理论的方法分析设计了平行板波导CTS 天线。建立平行板波导天线的等效电路模型,利用传输线方 程计算天线上的电压分布、电流分布以及辐射阻抗,进而分析远场的辐射特性。最后用Ansoft HFSS 软件仿真验证了该 方法的正确性。     

Low-Noise Design for Wideband Front-End Circuits and Systems of Optical and Microwave Receivers

Analog front-end circuits and systems is becoming increasingly important as technology continues to wideband. In this paper, based on the two-port equivalent noise models, a modularized method is developed to fast and accurate noise analysis and design of preamplifier, which is the most critical building block in the front-end circuits. A fundamental noise model is En - In model. Using the En - In model data, all noise performance indexes can be predicted easily. Moreover, the correlation coeffi- cient between En and In is assumed to be a complex here, not a real in the conventional, for the accurate estimation of optimum source impedance. In addition, the matching networks and noise canceling technique for wideband appli- cation are overviewed and summarized here. Finally, the illustrative experiments verify that the proposed technique has a significant potential use for high sensitivity receivers.     

光纤信号源IP化传输接收系统的设计与实现

在有线前端机房为发射台传送央视光纤信号源的旧系统即将淘汰,并且有线前端机房信号传输已经IP化的大背景下,本文介绍了采用"交换机+解码器"的模式对信号源光纤传输与接收系统进行更新重建的设计方案,该方案实现了央视光纤信号源稳定可靠的接收。