一种双陷波超宽带单极子天线的设计

提出了一种新型双陷波特性的超宽带单极子天线。通过在介质基板上添加锥形辐射贴片,天线可以覆盖超宽带通信频段。在辐射贴片上引入上、下两个锥形缝隙结构,可以实现3.5 GHz、5.5 GHz的双陷波特性。天线实测模型电压驻波比＜2的阻抗带宽是2.56~10.61 GHz,其中3.18~3.76 GHz和4.4~5.75 GHz具有陷波特性。测试表明,天线在工作频带内具有全向辐射特性。     

架设在5层楼楼顶的双锥中波小天线

简要介绍了双锥中波小天线的结构和工作原理。将双锥中波小天线架设到5层楼楼顶,能满功率播出且辐射效果与自立塔相当,保证了中波节目的安全播出。简单介绍了为此所做的屏蔽及接地工程。     

基于HFSS的波导裂缝有源导纳的计算方法

提出一种基于商业软件HFSS仿真得到的开缝波导散射参数来提取辐射缝隙自导纳和有源导纳的方法。根据传输线理论．给出了通过散射参数计算孤立缝隙自导纳的公式．同时给出了考虑互耦的有源导纳方程．利用牛顿迭代法求解此方程得到裂缝的有源导纳值。该方法非常适合于波导天线阵的设计．有效地提高了天线阵的设计效率.     

探索机电联合仿真优化在米波雷达天线设计中的应用

米波雷达拥有反隐身、抵抗反辐射导弹的特长,其工作频率低,波长长,天线尺寸比较大。文中针对数字阵列米波八木天线的阵面稀疏庞大结构特点,探索机电联合仿真优化来解决米波雷达天线研制中的困难。通过天线参数优化、天线口径优化和天线精度优化等机电联合仿真优化,研究出新构型的八木天线,提高天线单元布置密度,降低雷达天线体积和质量,即能使雷达机动快速架设,又能确保天线的指向精度,满足雷达的性能指标。     

弯折线偶极子天线谐振特性的研究

本文研究了由矩形弯折线构成的偶极子天线的谐振特性,分析了弯折线偶极子天线的弯折次数、矩形弯折的高度以及弯折角度等参数对天线谐振特性的影响。结果表明,弯折线偶极子天线的参数改变对天线谐振特性有较强的调节作用,适当的改变天线的参数可以获得较好的天线尺寸缩减特性,适合RFID标签天线的应用。     

一种新型平面阿基米德螺旋天线的分析与设计

对一种新型的平面阿基米德螺旋天线--锯齿状平面阿基米德螺旋天线进行了研究。首先给出了该天线的几何结构,介绍了其主要特点和应用领域,设计并制作了一个2.9~6.2GHz的锯齿状平面阿基米德螺旋天线。测试表明,与普通平面阿基米德螺旋天线相比,该天线能够缩小尺寸,展宽频带,很好地改善天线的低频特性。     

余割波束天线检测方法的研究

对余割波束天线的检测方法进行了较深入的探讨。坐标测量采用由电子经纬仪构成的工业测量系统 ,其测量速度快、精度高 ,坐标测量精度在± 0 .0 5 0 mm左右。数据处理采用公共点近似恢复天线的设计坐标系 ,在设计数据中通过独特的内插方法查找出测量点对应的理论值 ,求出了天线的面形误差 ,解决了无需天线解析方程的最佳拟合计算问题。根据实测结果和三坐标机检测结果的对比 ,证明了该方法是正确和可靠的     

TD-SCDMA系统的关键技术和特点分析

文章介绍了第三代移动通信系统标准及发展概况,分析了我国提出的TD-SCDMA系统的关键技术和特点。     

THz antennas design,developments, challenges,and applications: A review

Terahertz (0.1–10 THz) wireless communication will be the future technology to reach a top-notch data rate. THz is one of the most promising candidates for 6G systems because it provides enormous bandwidth, up to 100 GHz, and a massive data rate of up to 1 Tbps. THz antennas, antenna arrays, and MIMO antenna arrays in 6G are hot research topics for implementing 6G wireless communication systems. The 6G aims to continue to enhance the features of the 5G as it is capable of achieving the maximum high-speed data rate, excellent reliable communication, massive connectivity, and very low latency connectivity. The 6G requirements need high-gain antenna arrays and MIMO antenna arrays to combat the effect of atmospheric losses in high frequencies. An in-depth discussion of the planar THz antennas that have been extensively used in THz applications like imaging, sensing, and Internet-of-Things (IoT) has been conducted. The study of the THz antennas, antenna arrays, and MIMO antennas on different conducting materials such as copper and graphene, which are designed on different dielectric substrates such as polyimide, quartz, liquid crystalline polymer, and polytetrafluoroethylene, has been carried out in detail. Metamaterial, photoconductive, plasmonic antennas, and THz beamforming are significant parts of THz communications. This paper also provides antennas and antenna arrays based on them.     

Modeling and Simulation of New Encoding Schemes for High‐Speed UHF RFID Communication

In this paper, we present novel high‐speed transmission schemes for high‐speed ultra‐high frequency (UHF) radio‐frequency identification communication. For high‐speed communication, tags communicate with a reader using a high‐speed Miller (HS‐Miller) encoding and multiple antennas, and a reader communicates with tags using extended pulse‐interval encoding (E‐PIE). E‐PIE can provide up to a two‐fold faster data rate than conventional pulse‐interval encoding. Using HS‐Miller encoding and orthogonal multiplexing techniques, tags can achieve a two‐ to three‐fold faster data rate than Miller encoding without degrading the demodulation performance at a reader. To verify the proposed transmission scheme, the MATLAB/Simulink model for high‐speed backscatter based on an HS‐Miller modulated subcarrier has been designed and simulated. The simulation results show that the proposed transmission scheme can achieve more than a 3 dB higher BER performance in comparison to a Miller modulated subcarrier.