一种弹载低剖面高集成雷达结构设计

针对弹载平台严苛的空间尺寸和重量设计要求,提出了一种前端天线阵面采用一体化片式可扩充天线模块,后端综合射频单元、综合处理单元以及电源单元采用模块高集成化设计,模块间采用射频和低频连接器混合盲配互连的结构设计方法。一体化片式可扩充天线模块的应用使得天线阵面具备二维拓展功能,同时结合高低频混频盲配互联技术,可有效降低天线阵面的剖面高度,满足18.5g高量级振动使用要求,并可在50℃初始温度下可靠工作2 100 s。模块高集成设计在实现系统轻量化的同时,可满足系统结构对刚强度的设计要求。     

弹载遥测系统天线设计

飞行导弹的特殊应用环境对弹载天线设计提出了特殊的要求,本文以飞行导弹弹载数据遥测为应用背景,对弹载发射天线方案进行分析比较和优化,设计了一种S波段圆极化共形微带天线方案,克服目前弹载天线安装困难、频带窄,易受干扰等缺点。天线的有效工作频带展宽为2243~2263 MHz,中心频率为2250.5 MHz,工作频段内电压驻波<2。采用ANSOFT HFSS软件进行天线性能仿真、测试,表明该弹载天线安装方便,在高冲击高过载条件下天线性能指标优良,所选方案切实可行,可应用于不同设备的遥测和弹载天线应用中。     

某车载高机动雷达天线阵面结构设计

设计一种带有被动翻转天线单元的天线阵面，天线单元通过一种联动机构随天线阵面的展/收状态而实时改变自身状态，以实现高机动车载雷达天线阵面系统的自动架/撤功能，并通过力学仿真分析验证了天线骨架结构设计的合理性。     

弹载小型化高速信号处理机设计方案

弹载处理机受特殊的平台功能、环境条件等因素制约,具有高性能、小型化等特点。弹载小型化高速信号处理机采用基于多通道宽带采样技术和多核心高速并行处理技术的设计方案,解决了高速高密度小型化电路设计和高速浮点数字信号处理器(DSP)多核心协同工作两大关键技术,并在不影响处理机实时性的前提下,设计出了一种基于嵌入式操作系统设计理念的多核心协同工作框架软件。弹载处理机可满足弹载多领域的功能和指标需求。     

一种用于交通测速的毫米波天线阵的设计

基于交通测速雷达高精度、轻型化和小型化等要求,给出了以一种可用于交通测速的毫米波天线阵的设计。天线阵采用串并混合馈电方式,对天线单元以及馈电网络进行独立设计,对天线阵进行一体化设计和加工验证。天线阵采用串、并联方式进行馈电,从而实现天线单元幅度的泰勒分布,使得天线阵在24~24.25 GHz的工作频段内,在E面和H面均获得小于-20 d B的低副瓣性能。整部天线阵具有轻型化、低副瓣和高增益等特点,满足作为交通测速雷达的需求。     

弹上微带天线的研究

在目前微带天线的理论设计不完善的情况下,本文探索性地研制了三种不同形式的微带天线阵,即六元谐振串馈式梳形微带天线阵、八元非谐振串馈式矩形微带天线阵以及微带卷绕全向天线;讨论了这些微带天线阵的实用设计方法,并做了大量的理论计算和实际测量,特别是这些实用设计方法可用于设计任意波束指向的微带天线阵,其将来的应用前景极广。理论设计与实测结果基本一致,能满足工程要求。     

弹载图像小波实时处理技术研究

以战场图像侦察弹为需求背景，采用小波理论对弹载图像实时压缩技术进行了研究，分析了弹载图像压缩特点和机理，给出了小波帧内压缩算法模型及弹载实时压缩硬件实现电路，实验室硬件仿真结果表明该模型可用于战场弹载图像的无线传输。     

PCM智能数据采集器

介绍了一种用ＴＭＳ３２０Ｃ２５作控制单元的用于ＰＣＭ遥测系统的弹载智能数据采集设备，重点介绍了它的设计方案，技术性能，简要原理及机器特征。     

一种弹载共形锥形波束天线的设计

设计了一种弹载微带准八木天线阵,该阵列与弹体曲面共形,不影响弹体的动力学特性,也不损伤弹体的机械强度。利用HFSS电磁仿真软件对模型进行仿真,同时针对实际安装过程中出现的公差进行了分析,以指导加工实物的安装。该天线的辐射方向图为后向锥形波束,增益为2.8d Bi,整个工作频段内辐射特性稳定,符合性能要求。     

基于DSP的高性能通用并行弹载计算机设计与实现

为满足弹上信号处理领域不断增长的任务需求并适应不同的应用场合,设计高性能通用并行计算机,进而构建各类信号处理系统是一种趋势.基于对共享总线和分布式两种并行结构的理论分析,结合信号处理系统的特点,设计了一种高性能通用并行弹载计算机,它具有标准化、模块化、可扩展、可重构、混合并行模式、多层次互联的特性,通过构建典型弹载计算机验证了这些特性.     

一种小型化弹载共形天线的设计

精确制导导弹的隐蔽性以及抗干扰特性对弹载天线的带宽提出了更高的要求,而且在安装空间受限的弹载应用场合,弹载天线必须具有较低的剖面高度才能保证导弹的气动外形及飞行性能,因此,性能优越的超宽带天线以及共形天线成为重要的研究方向。文章以圆台形金属弹体为载体,设计了对数周期天线以及小型化改进的对数周期天线共形于圆台金属弹体表面,并能够组成六元天线阵列。仿真与实验测试结果说明了该设计的合理性。     

An RFID Tag Using a Planar Inverted‐F Antenna Capable of Being Stuck to Metallic Objects

This letter presents the design for a low‐profile planar inverted‐F antenna (PIFA) that can be stuck to metallic objects to create a passive radio frequency identification (RFID) tag in the UHF band. The designed PIFA, which uses a dielectric substrate for the antenna, consists of a U‐slot patch for size reduction, several shorting pins, and a coplanar waveguide feeding structure to easily integrate with an RFID chip. The impedance bandwidth and maximum gain of the tag antenna are about 0.3% at 914 MHz for a voltage standing wave ratio (VSWR) of less than 2 and 3.6 dBi, respectively. The maximum read range is about 4.5 m as long as the tag antenna is on a metallic object.     

天线的电磁兼容技术

首次提出了"天线的电磁兼容性"问题.对天线电磁兼容的基本概念和工程研制进行了较为充分的阐述.探讨了表征和测量天线电磁兼容性的各项技术参数和技术指标.在海、陆、空、天、弹等载体上的天线电磁兼容的研究基础上,总结归纳出了天线电磁兼容的主要设计技术.例举了某机载天线电磁兼容的工程设计.实测结果表明,该技术具有一定的实用性和有效性.     

机载相控阵雷达天线阵的可靠性新模型

影响机载相控阵雷达下视能力的一个重要指标是天线的超低副瓣特性。在传统的机载相控阵雷达天线的可靠性设计中是对n中取女的表决模型冗余量进行压缩，该方法没有考虑失效T／R组件的分布位置对天线超低副瓣性能的影响。通过数学归纳法建立了在收发组件失效分布约束奢件下，机载相控阵雷达天线阵的可靠性数学模型。该模型的正确性经过了仿真验证。通过实例比较说明了传统可靠性设计方法可能带来的工程设计风险。该模型可用来指导机载相控阵天线的可靠性设计。     

Enhanced‐Gain Planar Substrate‐Integrated Waveguide Cavity‐Backed Slot Antenna with Rectangular Slot Window on Superstrate

A novel substrate‐integrated waveguide (SIW) cavity‐backed slot antenna is proposed in this study to achieve enhanced‐gain performance. The peak gain is remarkably improved with the use of an SIW cavity and metallic superstrate. The superstrate comprises a single rectangular slot window and two half‐wavelength patches. The gain can be enhanced by combining the in‐phase radiating fields. Further, the 10 dB bandwidth of the proposed antenna ranges from 2.32 GHz to 2.49 GHz, which covers the wireless local area network band. The measured peak gain is 9.44 dBi at 2.42 GHz.     

Comparison of different antenna arrays for the BER reduction in indoor wireless communication

In this paper, we use the ultra wideband antenna array combined with particle swarm optimization (PSO) to minimize the BER for indoor communication systems. Three types of antenna arrays, namely the circular shape, L shape, and Y shape arrays, are used in the transmitter and their corresponding BER on several paths in the indoor environment are calculated. On the basis of the topography of the antenna array and the BER formula, the array pattern synthesis problem can be reformulated into an optimization problem and solved by the PSO. The novelties of our approach is not only choosing BER as the object function instead of the sidelobe level of the antenna pattern, but also considering the antenna feed length effect of each array element. The particle swarm optimization algorithm is employed to optimize the excitation voltages and feed lengths for these antenna arrays to reduce the BER. The strong point of the PSO is that it can find the solution even if the performance index cannot be formulated by simple equations. By the obtained antenna patterns, we can know the route with the lowest BER; meanwhile, transmission power using this route can be reduced. Numerical results show that the synthesized antenna array pattern is effective in focusing maximum gain to the line‐of‐sight path for these antenna arrays. The synthesized array pattern also can mitigate severe multipath fading in complex propagation environments. As a result, the BER can be reduced substantially in indoor ultra wideband communication systems. The investigated results can help communication engineers improve their planning and design of indoor wireless communication.Copyright © 2011 John Wiley & Sons, Ltd.     

一种飞航导弹弹载发射天线设计

以飞航导弹弹载数据链为应用背景,通过综合分析、比较、优化和仿真,设计了一种与飞航导弹共形、具有大角域覆盖能力的弹载发射天线。仿真结果说明了该天线性能满足飞航导弹卫星通信需求,在解决工程实际问题的同时,为此类应用提供了一种新型天线方案,为相关设计提供了一种思路。     

一种波束切换机载测控天线的设计方法

机载测控天线采用定向波束切换天线,不仅可以提高天线的增益,而且可以提高系统的抗干扰能力。采用全向天线单元组阵、通过简易波束控制实现的波束切换天线,具有电气性能好、控制方法简单和可实现性好等特点。介绍了7单元圆形阵列结构波束切换天线的工作原理以及采用简易相位控制实现波束切换的方法,并给出了天线的实测结果,验证了设计方法的正确性。     

Design of Implantable Rectangular Spiral Antenna for Wireless Biotelemetry in MICS Band

For this study, we designed an implantable rectangular spiral antenna for medical biotelemetry in the Medical Implant Communications Service band (402 MHz to 405 MHz). The designed antenna has a U‐shaped loop for impedance matching. The antenna impedance is easily adjusted by controlling the shape and length of the U‐shaped loop. Significant design parameters were studied to understand their effects on the antenna performance. To verify the potential of the antenna for the desired applications, we fabricated a prototype and measured its performance in terms of the resonant characteristics and gain radiation patterns of the antenna. In the testing phase, the prototype antenna was embedded in human skin tissue–emulating gel, which was developed to simulate a real operation environment. The measured resonant characteristics show good agreement with the simulations, and the ?10 dB frequency band is within the range of 398 MHz to 420 MHz. The antenna exhibits a maximum gain of ?22.26 dBi and an antenna efficiency of 0.215%.     

Metal/Polymer Based Stretchable Antenna for Constant Frequency Far‐Field Communication in Wearable Electronics

Body integrated wearable electronics can be used for advanced health monitoring, security, and wellness. Due to the complex, asymmetric surface of human body and atypical motion such as stretching in elbow, finger joints, wrist, knee, ankle, etc. electronics integrated to body need to be physically flexible, conforming, and stretchable. In that context, state‐of‐the‐art electronics are unusable due to their bulky, rigid, and brittle framework. Therefore, it is critical to develop stretchable electronics which can physically stretch to absorb the strain associated with body movements. While research in stretchable electronics has started to gain momentum, a stretchable antenna which can perform far‐field communications and can operate at constant frequency, such that physical shape modulation will not compromise its functionality, is yet to be realized. Here, a stretchable antenna is shown, using a low‐cost metal (copper) on flexible polymeric platform, which functions at constant frequency of 2.45 GHz, for far‐field applications. While mounted on a stretchable fabric worn by a human subject, the fabricated antenna communicated at a distance of 80 m with 1.25 mW transmitted power. This work shows an integration strategy from compact antenna design to its practical experimentation for enhanced data communication capability in future generation wearable electronics.