Ultra-Low-Power Wireless Transmitter with Passive Bragg Oscillator

ECCS-0725688康奈尔大学的Edwin Kan智能优点：拟议的工作旨在实现用于毫米系统低比特率通信的超低功率无线发射机的根本性突破。在传统的无线电链路中，受系统总体几何形状的限制，天线尺寸较小，需要较高的载频，而功率消耗的下限将由无线电电路的寄生电容来设定。为了解决这一基本冲突，以前有过几项努力，包括扩展休眠模式、超宽带脉冲系统和基于载波的脉冲无线电。然而，要么是物理天线难以实现，要么是功率不能充分降低。提出的发射机只需要一个窄带天线，但由无源布拉格格子产生载波振荡。数字基带以接近指定通信比特率的低频工作，并且可以容易地以数字手表的方式实现。信号的上升和下降时间可以先由缓冲器锐化，然后在非线性传输线中随着幅度的增大而进一步锐化。当波前含有特征频率超过布拉格晶格频率的大信号时，产生高功率转换效率的单音振荡波来驱动毫米波天线。更广泛的影响：廉价的毫米尺寸自主系统有许多重要的应用，如环境监测、用于疾病筛查和检测的身体植入物(以最小限度的干预)、创建智能空间和结构健康监测。缺少的关键技术是低功率无线链路。这项研究的成功将对传感器网络和生物医学植入物产生重大影响。微型自主系统设计还将成为面向高中女生和少数族裔学生的主要范例，以提高他们将工程学作为与社会相关的职业方向的能力。

ECCS-0725688Edwin Kan, Cornell UniversityIntellectual Merit:The proposed effort seeks to make a fundamental breakthrough in realizing the ultra-low-power wireless transmitter for low-bit-rate communication in millimeter-size systems. In conventional radio link, the small antenna size constrained by the overall system geometry will require high carrier frequency, but a lower limit of the power consumption will be set by the parasitic capacitance of the radio circuits. There are several previous efforts to resolve this basic conflict, including an extended dormant mode, ultra-wide-band pulse systems, and the carrier-based impulse radio. However, either the physical antenna is difficult to realize, or the power can not be sufficiently reduced. The proposed transmitter requires only a narrow-band antenna, but generates the carrier oscillation from a passive Bragg lattice. The digital base band is operated at a low frequency close to the specified bit rate of communication, and can be readily implemented in the digital wrist watch fashion. The signal rise and fall time can be first sharpened by a buffer, and then be further sharpened with enlarged magnitude in nonlinear transmission lines. When the wave front contains a large signal with characteristic frequency exceeding the Bragg lattice frequency, single-tone oscillating waves are generated with high power conversion efficiency to drive the millimeter-size antenna. Broader Impact:Inexpensive millimeter-size autonomous systems have many important applications such as environmental monitoring, body implants for disease screening and detection with minimal intrusion, the creation of intelligent spaces, and structural health monitoring. The key missing technology is the low-power wireless link. The success of this research effort will bring forth major impacts on senor network and biomedical implants. The miniature autonomous system design will also serve as the main example for outreach to high-school female and minority students to boost their aptitude towards engineering as a socially relevant career direction.