共查询到20条相似文献,搜索用时 78 毫秒
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毫米波相控阵雷达及其应用发展 总被引:2,自引:2,他引:2
概述了毫米波相控阵雷达的特点,介绍了电扫原理和主要毫米波电扫技术,以及相位控制扫描和多种移相器技术。针对毫米波相控阵雷达的特点,叙述了其主要应用领域,结合雷达和半导体技术对毫米波相控阵雷达的发展进行了展望。 相似文献
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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。 相似文献
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从相控阵天线的特殊应用出发,讨论相控阵技术中常用的剩磁铁氧体移相器的研究现状及其应用,分别介绍了几种较为常用的移相器,并给出了相应的理论方法,文中还对几种移相器的性能进行了比较分析,这对移相器的工程应用具有一定的指导意义。 相似文献
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本文从射频微波观点回顾了微电子机械系统(MEMS)技术进展,重点讨论在射频领域,特别是在雷达T/R组件上有望广泛应用的器件、组件以及系统。意在唤起重视MEMS技术在雷达上的推广应用,有益于雷达事业的蓬勃发展。 相似文献
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矢量调制器芯片作为一种可以同时对载波进行相位和幅度调制的新型电路,能够替代传统的数字移相器和数字衰减器用在有源相控阵系统中.先设计了一款工作在Ka波段毫米波单片矢量调制器,在片测试结果显示可以实现- 12~-40 dB的幅度调制与360°的相位调制.然后设计了一个Ka波段1×8阵有源相控阵天线,改变矢量调制器的控制电压... 相似文献
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先进战机多功能相控阵系统综合射频隐身技术 总被引:1,自引:1,他引:1
射频隐身是未来先进战机隐身要求的重要方面,研究机载电子设备、尤其天线系统的射频隐身技术是现实的和迫切的;特殊设计的相控阵系统能够同时担负雷达、电子战和高速数据链等各种战术任务,是未来先进战机不可或缺的重要电子装备。文中从相控阵天线系统的辐射特性与LPI、散射特性与LO和战术任务规划等方面论述了实现多功能相控阵系统射频隐身的技术方向,理清研究的先后层次,指出未来研究的发展方向。 相似文献
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This paper presents a novel electronically scanning phased-array antenna with 128 switches monolithically implemented using RF microelectromechanical systems (MEMS) technology. The structure, which is designed at 15 GHz, consists of four linearly placed microstrip patch antennas, 3-bit distributed RF MEMS low-loss phase shifters, and a corporate feed network. MEMS switches and high-Q metal-air-metal capacitors are employed as loading elements in the phase shifter. The system is fabricated monolithically using an in-house surface micromachining process on a glass substrate and occupies an area of 6 cm times 5 cm. The measurement results show that the phase shifter can provide nearly 20deg/50deg/95deg phase shifts and their combinations at the expense of 1.5-dB average insertion loss at 15 GHz for eight combinations. It is also shown by measurements that the main beam can be steered to required directions by suitable settings of the RF MEMS phase shifters. 相似文献
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Integrated Phased Array Systems in Silicon 总被引:3,自引:0,他引:3
Hajimiri A. Hashemi H. Natarajan A. Guan X. Komijani A. 《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》2005,93(9):1637-1655
Silicon offers a new set of possibilities and challenges for RF, microwave, and millimeter-wave applications. While the high cutoff frequencies of the SiGe heterojunction bipolar transistors and the ever-shrinking feature sizes of MOSFETs hold a lot of promise, new design techniques need to be devised to deal with the realities of these technologies, such as low breakdown voltages, lossy substrates, low-Q passives, long interconnect parasitics, and high-frequency coupling issues. As an example of complete system integration in silicon, this paper presents the first fully integrated 24-GHz eight-element phased array receiver in 0.18-/spl mu/m silicon-germanium and the first fully integrated 24-GHz four-element phased array transmitter with integrated power amplifiers in 0.18-/spl mu/m CMOS. The transmitter and receiver are capable of beam forming and can be used for communication, ranging, positioning, and sensing applications. 相似文献
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Kingsley N. Ponchak G.E. Papapolymerou J. 《Antennas and Propagation, IEEE Transactions on》2008,56(1):108-118
For the first time, a fully integrated phased array antenna with radio frequency microelectromechanical systems (RF MEMS) switches on a flexible, organic substrate is demonstrated above 10 GHz. A low noise amplifier (LNA), MEMS phase shifter, and 2 times 2 patch antenna array are integrated into a system-on-package (SOP) on a liquid crystal polymer substrate. Two antenna arrays are compared; one implemented using a single-layer SOP and the second with a multilayer SOP. Both implementations are low-loss and capable of 12deg of beam steering. The design frequency is 14 GHz and the measured return loss is greater than 12 dB for both implementations. The use of an LNA allows for a much higher radiated power level. These antennas can be customized to meet almost any size, frequency, and performance needed. This research furthers the state-of-the-art for organic SOP devices. 相似文献
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本文讨论了光注入锁定技术的发展,给出了光控锁相技术对FET振荡器讯号频率和相位进行独立控制的方法,还给出了光控微波相移器的原理,由引获得新颖的光控相控阵天线波束成形与控制技术及具体的设计结构。 相似文献
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Phased planar radars represent a class of equipment employing hundreds or thousands of individual electronically steerable radiating and receiving elements. In the operation of such systems, it is necessary to keep continually ahead of an advancing failure accumulation through maintenance policies geared to replacement-while-in-operation concepts. Several practical maintenance policies are considered: 1) immediate maintenance, 2) delayed maintenance, and 3) cyclic maintenance. The effects of these policies on the outage availability are considered and it is shown that each has certain advantages. Immediate maintenance yields the highest system availability, but requires the continued presence of a moderate size maintenance force. Increasing the number of maintenance crews increases the availability of phased array systems, but the added contribution to satisfactory system states shrinks rapidly with the growth of crews. Delayed and cyclic maintenance both involve a more leisurely, planned work pace characterized by periods of relatively low service activity, followed by periods of intense activity to restore the system. At the expense of some system availability, these policies require only part-time presence of maintenance personnel and may well be the most attractive alternatives for phased array radar systems possessing some degree of surplus performance. 相似文献