一种新型铁电体移相器

介绍了一种用于相控阵雷达的新型铁电体移相器,利用有限元方法对铁电体材料加载波导移相器进行了分析,给出了计算结果。最后讨论了铁电体移相器设计中几个值得关注的重要问题。     

一种基于压控移相技术的低成本相扫天线

研制了一种基于铁电体压控移相技术的低成本相扫天线阵列,该天线采用空间馈电透镜型式,省去复杂的馈电网络,减少移相器/TR组件数量,能显著降低相控阵天线的制造成本。介绍了空馈铁电体透镜相控阵天线系统的组成及其特点。对透镜天线关键部件的设计作了详细阐述,给出了12列铁电体空馈透镜天线阵列的实验结果,结果表明:在X波段,研制的铁电体透镜天线阵列在10%频带内可实现天线波束±45°的电控扫描,各扫描状态的输入驻波比小于1.4。     

低成本相控阵技术在机载雷达中的应用

传统的机械扫描雷达由于受其扫描速度的限制,在机载雷达的应用中已逐步被功能强大的电扫描相控阵雷达所取代。针对相控阵雷达造价高、体积和重量大的问题,根据一种新型的铁氧体透镜移相器技术的发展,文中介绍了移相器作为馈电系统的一个关键微波元件,和与此相应的控制移相器的电路一起组成相控阵雷达的数千个单元,而每一个单元都要用一个移相器,进而阐述了移相器的性能和成本极大地影响到雷达的性能和成本。采用这种新技术可将实现相控阵天线二维扫描功能的移相器的数目由M×N个减少到M+N个,大大降低了机载雷达的成本和体积。     

阻抗匹配器级数对铁电体移相器性能的影响

针对铁电体透镜式移相器的阻抗失配问题,分别采用3级、4级和5级的1/4波长阻抗匹配器结构,对铁电体移相器进行阻抗匹配调试仿真。通过对比不同匹配级数的匹配效果,最终确定了4级的匹配方案,并通过进一步优化器件结构,设计出的铁电体移相器在X频段内可实现360°相移,驻波比在主带宽内小于1.2,反射系数大于20 dB,中心频率处反射系数达到40 dB,信号传输系数在低频处小于1.1 dB,在高频处为1.5 dB,实现了铁电体移相器较好的阻抗匹配。     

以循环移位控制为基础的相控阵天线快速测量方法研究

为了解决相控阵天线快速测试问题,本文研究了一种相控阵天线测量的新方法。该方法中相控阵天线和测试探头均不动,利用相控阵天线中各移相器的移相状态可循环移位控制的特点和相控阵天线一些已知可信的信息,从而使测量具有极高的效率。文中对一相控阵天线模型采用该测量方法的测量全过程进行模拟,验证了该方法的正确性和高效性。     

基于液晶移相器的相控阵天线低成本制造技术

液晶移相器可作为中低轨无线卫星中相控阵天线实现电控波束扫描的关键部件。本文提出了一种基于成熟面板技术的高精度、低成本液晶移相器可行的量产化制造方案。实现了低方块电阻（Rs<0.02）,高精度线宽线距（1μm厚铜CD/Space可达到3.5μm/8μm）,并支持多规格Cu膜层厚度（1μm～3μm）物理气相沉积制备,高精度液晶滴下工艺以及高对准、低插损FPC和IC邦定工艺等量产可行性方案。低液晶盒厚度（Cu-Cu间距4μm～6μm）的量产工艺相较于传统方案液晶用量大幅降低,成盒精度高,不仅降低了液晶相控阵天线的材料成本,亦可提高液晶移相器的响应速度,从而提升液晶相控阵天线的波束扫描速率等性能。     

基于最佳配相控制的相控阵天线快速测量方法研究

为了解决相控阵天线快速测试问题,研究了一种相控阵天线测量的新方法.测试中相控阵天线和测试探头均不动,利用相控阵天线中各移相器的移相状态可控的特点,采用优化的配相快速算法,应用相控阵天线一些已知可信的信息,从而使测量具有较高的效率.给出了一个相控阵天线模型的仿真结果,以验证方法的正确性和有效性.     

时钟电路、倍频器、分频器、混频器、变频器、移相器

0623091一种新型铁电体移相器[刊,中]/周雁翎//雷达科学与技术．—2006,4(3)．—189-192(D)介绍了一种用于相控阵雷达的新型铁电体移相器,利用有限元方法对铁电体材料加载波导移相器进行了分析,给出了计算结果。最后讨论了铁电体移相器设计中几个值得关注的重要问题。参4 0623092台达V系列变频器转矩控制模式的技术应用[刊,中]/张硕//单片机与嵌入式系统应用．—2006,(7)．—84-85(C) 0623093可编程数字解调分析模块的设计应用[刊,中]/史英春//系统工程与电子技术．—2006,28(6)．—807-808,928(E)利用数字下变频器HSP50214B同TMS320C5409 DSP的配合,设计了一种可编程的数字解调分析模块,通过软件编程实现对不同调制样式信号的解调和分析,最后给出了该模块在数字监测接收系统中的应用。实验证明该模块在无线电接收系统中有着很强的实用     

S波段双模互易铁氧体移相器的设计

介绍了一种新型的用于相控阵雷达天线的双模互易铁氧体移相器,简述了该移相器的应用前景、性能特点,分析了其工作原理、设计方法及关键技术。     

S波段双模互易铁氧体移相器的设计

介绍了一种新型的用于相控阵雷达天线的双模互易铁氧体移相器,简述了该移相器的应用前景、性能特点,分析了其工作原理、设计方法及关键技术。     

基于复合左右手传输线相移器的串馈相控阵天线

基于电调复合左右手传输线相移器,提出了一种新型相控阵天线波束控制方式：通过电压控制相移器的相移,从而使相控阵天线中心频率工作在边射方向,并允许向边射外的两个方向进行扫描。作为实例,设计制造了一个应用在ISM波段的平面串联馈电贴片相控阵天线,并对其进行了测试。结果表明：该相控阵天线可实现连续扫描,边射方向波束倾斜小(2°...     

Advances in Scanning Reflectarray Antennas Based on Ferroelectric Thin-Film Phase Shifters for Deep-Space Communications

Though there are a few examples of scanning phased array antennas that have flown successfully in space, the quest for ldquolow costrdquo high-efficiency large-aperture microwave phased arrays continues. Fixed and mobile applications that may be part of a heterogeneous exploration communication architecture will benefit from the agile (rapid) beam steering and graceful degradation afforded by phased array antennas. The reflectarray promises greater efficiency and economy compared to directly radiating varieties. Implementing a practical scanning version has proven elusive. The ferroelectric reflectarray, under development and described herein, involves phase shifters based on coupled microstrip patterned on films that were laser ablated onto substrates. These devices outperform their semiconductor counterparts from X- through and K-band frequencies. There are special issues associated with the implementation of a scanning reflectarray antenna, especially one realized with thin-film ferroelectric phase shifters. This paper will discuss these issues, which include relevance of phase shifter loss; modulo 2 effects and phase shifter transient effects on bit error rate; scattering from the ground plane; presentation of a novel hybrid ferroelectric-semiconductor phase shifter; and the effect of mild radiation exposure on phase shifter performance.     

Voltage-controlled ferroelectric lens phased arrays

A new concept for phased arrays is proposed using a voltage-controlled ferroelectric lens. The ferroelectric lens concept uniquely incorporates bulk phase shifting-the array does not contain individual phase shifters-using ferroelectric material. This will reduce the number of phase shifters from (n×m) to (n+m), where n is the number of columns and m is the number of rows in a phased array. The number of phase shifter drivers and phase shifter controls is also significantly reduced by using row-column beam steering. Thus, the ferroelectric lens concept can potentially lead to low-cost phased arrays. This paper presents the ferroelectric lens concept, theoretical analysis and design, and experimental results. The results indicate that the ferroelectric lens concept is viable and sound. Various phased-array configurations using ferroelectric lens are included. A discussion on ferroelectric materials is included along with information on a US Department of Defense program to improve ferroelectric materials     

X‐Band Phased Array Antenna Using Ferroelectric (Ba,Sr)TiO3 Coplanar Waveguide Phase Shifter

A phased array antenna was fabricated using four‐element ferroelectric phase shifters with a coplanar waveguide (CPW) transmission line structure based on a Ba0.6Sr0.4TiO3(BST)/MgO structure. Epitaxial BST films were deposited on MgO (001) substrates by pulsed laser deposition. To attain the large differential phase shift and small losses for a ferroelectric CPW phase shifter, an impedance‐matching‐part adding technique between the effective transmission line and connecting cable was used. The return loss and insertion loss for this technique‐adapted BST CPW device were improved with respect to those for a normal BST CPW device. For an X‐band phased array antenna system consisting of ferroelectric BST CPW phase shifters, power divider, dc block, patch antenna, and programmed dc power, the steering beam could be tilted by 15° in either direction.     

Predicted performance of magnetized semiconductor phase shifters for millimeter-wave microstrip array antennas

The tunable phase shift of a planar magnetized semiconductor phase shifter is presented, suitable for an integrated environment due to its miniature size, low-biasing requirements, and lower material related problems at millimeter-wave frequencies. A linear microstrip phased array antenna with an integrated semiconductor phase shifter is designed and the calculated beam steering properties are tabulated. The design process is verified by simulating similar ferrite-based linear phased array antennas.     

基于外场调制的方向图可控天线

该文设计了一款工作在2.45GHz并可实现60°扫描范围的方向图可控天线阵列。该天线阵列引入介电常数可控的铁电材料作为基板,通过外加直流偏置改变铁电材料的介电常数,从而实现单元馈电相位的连续变化。该天线阵列由馈电结构、隔直结构、移相器及天线阵元4部分组成,各部分分别集成在地板两侧的2个金属层上。不同于其他设计,该天线仅通过控制外加直流偏置电压的大小实现天线最大波束-30°~30°范围内的变化;此外,天线设计了一种新颖的直流偏置电路,减小了天线的设计复杂度,使设计的天线具有更高的实用价值。     

相控阵天线的设计与FDTD分析

基于工作频率在1.79 GHz的微带天线,首先研究了移相器的设计方法,然后利用两种不同方法实现的移相器,分别设计出了相控阵天线。通过FDTD进行建模和仿真实验,计算了相控阵天线在不同扫描角的远场辐射方向图,分析了实验误差,得出了结论,所设计的相控阵天线结构简约,主瓣尖锐,最大扫描角大于45°。     

A low-cost 8 to 26.5 GHz phased array antenna using a piezoelectrictransducer controlled phase shifter

A new phased array antenna of wide bandwidth and good beam scanning angle has been developed using a low cost multiline phase shifter controlled by a piezoelectric transducer (PET) and a stripline fed Vivaldi antenna array. The multiline progressive PET phase shifter has a low perturbation loss of less than 2 dB and a total loss of less than 4 dB up to 40 GHz with a maximum phase shift of 480°. The proposed phased array antenna consists of four E- or H-plane Vivaldi antennas, a PET phase shifter, and a power divider. The phased array shows a wide beam scanning capability of ±27° over a wide bandwidth from 8 to 26.5 GHz covering X, Ku, and K bands