Wireless, RF & Smart Dust

Research that includes:

  • Tuneable RF components: capacitors, inductors, transformers
  • RF microrelays
  • High frequency MEMS resonators: devices, structures, and processes

BPN405: Manufacturing Repeatability of the Frequency and Q of Capacitive Micromechanical Disk Resonators

Yang Lin
2009

The long-term goal of this project is to devise methods for improving the untrimmed repeatability of micromechanical resonators so as to widen the breadth of applications addressable by such devices.

Project end date: 08/11/09

BPN506: Wireless Physician Tracking

Samuel Zats
Steven Lanzisera
2009

Healthcare associated infections result in over 90,000 deaths at a cost of $4.5 – 5.7 billion annually. The Physician Tracking Project seeks to create a wireless sensor network which tracks the activity of physicians within a clinic. The system will log and notify physicians if he or she has approached a patient without the reapplication or cleansing of the hands. The project is in support and collaboration with the UC Davis Medical Center.

Project end date: 08/12/09

BPN367: AlN Piezo:Aluminum Nitride Piezo Thermoelastic Damping (MiNaSIP)

Gabriele Vigevani
2009

The Q-factor of a MEMS resonator is the result of a number of mechanisms: many of the damping sources are related with the evironment where the device is working such as air damping or viscous damping but many others are an intrinsic property of the vibrating structure. Among those the most common source of energy loss are the anchor losses, the excitation of spurious mode and the Thermo Elastic Damping (TED). The long-term objective of this project is to characterize the energy dissipation due to thermoelasticity in piezoelectric materials. In particular due to the increasing...

BPN464: Wafer-scale Heterogeneous Assembly of Highly Ordered Semiconductor Nanowire Arrays by Contact Printing

Toshitake Takahashi
Kuniharu Takei
Zhiyong Fan
Johnny C. Ho
Alexandra L. Ford
2010

We have achieved wafer-scale assembly of highly ordered arrays of NWs through a simple contact printing method which yielded high uniformity and reproducibility. In the assembled NW arrays, NW density was readily modulated through the surface chemical treatment of the receiver substrate. We have demonstrated that our printing approach is generic and a wide range of semiconductor NWs have been successfully assembled and integrated at large-scale. More importantly, we have developed nanowire roll printing to demonstrate the potential of a roll-to-roll nanowire printing process for...

BPN431: Levitated Micromechanical Resonators

Ilya Gurin
2009

This project aims to develop levitated ultra-high-Q micromechanical resonators based upon the principle of diamagnetism and/or electrostatics. These magnetic and electrostatic actuation schemes obviate the need for supports, thereby eliminating design-imposed anchor-to-substrate energy loss mechanisms and perhaps revealing the intrinsic Q of resonator materials. In addition, on-chip signal-conditioning circuitry will be developed and integrated together with resonators, providing precise control over the lateral position of the resonators.

Project end date: 01/28/...

BPN546: Fully-Integrated Cell Phone Reference Oscillator

Thura Lin Naing
2010

This project aims to achieve a fully integrated MEMS reference oscillator for cell phones, particularly the GSM standard. Integrating reference oscillators on chips reduces production cost significantly while, at the same time, MEMS resonators are able to maintain the same performance as in the current off-chip quartz-based oscillator. Low-temperature metal process for MEMS structures will be developed in order to integrate MEMS with MOS devices. In addition, phase noise performance of -117dBc/Hz at 1-kHz offset from a 60-MHz carrier and -137dBc/Hz at far-from-carrier offsets will be...

BPN561: Sensors and Capability Modeling for Palm-Sized Flying Robots

Anita Flynn
2010

Recent breakthroughs in understanding insect flight have led to increased interest in small robotic flying aircraft which can hover and navigate through cluttered environments. MEMS inertial sensors have been an enabler in this regard. What types of additional sensors are required for autonomous flight and of what sorts of behaviors could palm-sized fliers be capable? We are performing a Multidisciplinary Design Optimization, combining constraints of propulsive technologies, powertrain efficiencies, novel sensors and communication drop-off payload to understand this space. The...

BPN558: 16-Channel IEEE802.15.4 Packet Sniffer

Boyang Zhang
Thomas Watteyne
2010

The goal of this project is to build a multi-channel sniffer capable of listening on all available channels at the same time, and which can interpret the packets it receives. In its current state, 16 Atmel IEEE802.15.4 radios are driven by software capable of parsing packets into a user defined format. A front end graphical user interface displays the content of the received packets. Frequency-agile protocols for low power wireless sensor networks, such as IEEE802.15.4E or WirelessHART, use channel hopping to increase the robustness of the wireless link. In these networks, packets...

BPN479: Protocol-Agnostic Compression in Mobile Ad-hoc Networks (PACMAN)

Travis Massey
2010

Compression of packets in wireless sensor networks and mobile ad-hoc networks is of great interest because of the substantial opportunities for power and bandwidth savings. The method of compression discussed here is protocol agnostic, meaning that it operates with any combination of MAC, NET, TRAN, and APP layer protocols in an IEEE 802.15.4 network, while all previously devised compression schemes for wireless sensor data have a more substantial protocol dependence and thus require revisions as protocols are updated, or even complete replacement. Secondly, this method is adaptive,...

BPN559: Interfacing Smart Phones with Low Power Wireless Devices

Nahir Sarmicanic
Thomas Watteyne
2010

Interfacing smart phones with low power wireless radios enables the phone to interact with low power wireless devices such as individual motes of a wireless sensor network. Smart phones are ubiquitous and offer advanced user interface capabilities such as tilt sensor, accelerometer and touch screen. Combining both technologies opens up a whole new class of possibilities for a user to interact with low power wireless devices. The goal of this project is to develop applications for sending and receiving real time data to from wireless motes. This type of applications is not only useful...