RIA: A New Approach to Microwave/Millimeter-Wave Transmitters

RIA:微波/毫米波发射器的新方法

基本信息

  • 批准号:
    9109830
  • 负责人:
  • 金额:
    $ 6.5万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    1991
  • 资助国家:
    美国
  • 起止时间:
    1991-07-15 至 1994-06-30
  • 项目状态:
    已结题

项目摘要

There is a need for compact, high-power sources for radar applications in the microwave and millimeter- wave range. The output power levels of solid-state devices in this frequency range are limited. A possible solution to be explored in this Research Initiation Grant is to coherently combine the outputs of hundreds of active devices that load a two- dimensional metal grid with a period equal to a fraction of a free-space wavelength. This active surface is an antenna as well as source. The devices can be MESFETs arranged in a gate-feedback configuration. This type of oscillator has a wide frequency tuning range, as is required in most applications. The oscillating active surface is backed with a tuning mirror that has an electrically variable reflection coefficient. This mirror is another metal grid loaded with varactor diodes. The capacitance of the diodes, and therefore the reflection coefficient of this tuning surface, is bias dependant. The mirror provides positive feedback to the oscillator surface, which is necessary for the devices to lock to a single mode. In a radar, for example, the signal is usually transmitted in pulses. In cases when the transmitter itself cannot be switched on and off at a high rate, a switching active surface can be used. This surface consists of a grid loaded with pin diodes, and it electrically switches the wave transmitted from the oscillator grid. This system is compact and light weight, since it consists of a stack of planar dielectrics loaded with solid-state devices that do not require large power supplies. It is versatile, for example, another active surface of Schottky diodes placed in parallel with the oscillator could have a variable phase shift for beam steering or beam forming applications, or can be used as a multiplier. In addition, the planar structure is suitable for wafer- scale or modular integration.
在微波和毫米波范围内的雷达应用需要紧凑、高功率的源。在这个频率范围内,固态器件的输出功率水平是有限的。在这项研究启动基金中探索的一个可能的解决方案是将数百个有源设备的输出连贯地组合在一起,这些有源设备加载一个周期等于自由空间波长的一小部分的二维金属网格。这个有源表面既是天线又是信号源。这些器件可以是mesfet,以门反馈的方式布置。这种类型的振荡器有一个宽的频率调谐范围,因为在大多数应用中需要。振荡的活动表面背面有一个调谐镜,具有电可变反射系数。这面镜子是另一个装有变容二极管的金属网格。二极管的电容,因此该调谐表面的反射系数,是偏置相关的。镜面向振荡器表面提供正反馈,这是设备锁定到单一模式所必需的。例如,在雷达中,信号通常以脉冲形式传输。在发射机本身不能以高速率开关和关闭的情况下,可以使用开关活性表面。这个表面由一个装有引脚二极管的栅格组成,它用电开关从振荡器栅格传输的波。该系统结构紧凑,重量轻,因为它由一堆装载固态器件的平面电介质组成,不需要大的电源。它是通用的,例如,与振荡器平行放置的肖特基二极管的另一个有源表面可以具有可变相移,用于光束转向或光束形成应用,或者可以用作乘法器。此外,平面结构适合于晶圆级或模块化集成。

项目成果

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Zoya Popovic其他文献

Zoya Popovic的其他文献

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{{ truncateString('Zoya Popovic', 18)}}的其他基金

PFI-TT: Noninvasive, compact, internal body thermometer
PFI-TT:无创、紧凑型体内体温计
  • 批准号:
    2044668
  • 财政年份:
    2021
  • 资助金额:
    $ 6.5万
  • 项目类别:
    Standard Grant
High-resolution deep-tissue microwave thermometry
高分辨率深层组织微波测温
  • 批准号:
    2026523
  • 财政年份:
    2020
  • 资助金额:
    $ 6.5万
  • 项目类别:
    Standard Grant
Collaborative Research: Electromagnetic Field Profile Design for Next-Generation Travelling-Wave MRI
合作研究:下一代行波 MRI 的电磁场轮廓设计
  • 批准号:
    1307614
  • 财政年份:
    2013
  • 资助金额:
    $ 6.5万
  • 项目类别:
    Standard Grant
Microwave Radiometer for Internal Body Temperature Monitoring
用于体内温度监测的微波辐射计
  • 批准号:
    1202193
  • 财政年份:
    2012
  • 资助金额:
    $ 6.5万
  • 项目类别:
    Standard Grant
Hybrid Electromagnetic Near-Field Probing for Sub-surface Inhomogeneous Material Characterization
用于次表面非均匀材料表征的混合电磁近场探测
  • 批准号:
    0925636
  • 财政年份:
    2009
  • 资助金额:
    $ 6.5万
  • 项目类别:
    Standard Grant
Collaborative Research: A Heterogenous Integrated, Self Powered Wireless System
合作研究:异构集成、自供电无线系统
  • 批准号:
    0701780
  • 财政年份:
    2007
  • 资助金额:
    $ 6.5万
  • 项目类别:
    Standard Grant
Collaborative Research: MEMS Tuners for Multiband High-Efficiency Wireless Transmitter Front Ends
合作研究:用于多频段高效无线发射机前端的 MEMS 调谐器
  • 批准号:
    0218744
  • 财政年份:
    2002
  • 资助金额:
    $ 6.5万
  • 项目类别:
    Standard Grant
ITR/SI: Collaborative Research: Integrated Signal Processing and Antenna Array Design for Diversity Wireless Links
ITR/SI:合作研究:用于分集无线链路的集成信号处理和天线阵列设计
  • 批准号:
    0112591
  • 财政年份:
    2001
  • 资助金额:
    $ 6.5万
  • 项目类别:
    Standard Grant
Smart Active Antenna Arrays with Optical Processing
具有光学处理功能的智能有源天线阵列
  • 批准号:
    9979355
  • 财政年份:
    1999
  • 资助金额:
    $ 6.5万
  • 项目类别:
    Standard Grant
Presidential Faculty Fellow
总统教员研究员
  • 批准号:
    9350206
  • 财政年份:
    1993
  • 资助金额:
    $ 6.5万
  • 项目类别:
    Continuing Grant

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