Wireless, RF & Smart Dust

Research that includes:

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

BPN592: Workshop: Hands-On Intro to Low-Power Wireless Sensor Networking

Dr. Anita Flynn
Dr. Thomas Watteyne
Leo Keselman
2010

This IAB we have prepared a half-day tech-transfer workshop for industrial members teaching background, fundamentals, advantages and limitations associated with standards-based low-power sensor networks. Open standards are important because they allow technologies to gain traction and industries to blossom. Open-source reference implementations take things one step further. Because standard protocols invariably allow optional configurations, a reference implementation gives people a concrete example of how to get started. The proposed IEEE802.15.4e standard prescribes time...

BPN541: High-Voltage MEMS Resonators

Brian Pepin
2010

The use of high voltages (>100 volts) in MEMS-based resonators presents a pathway towards achieving low motional resistances while maintaining excellent linearity, as would be required, for example, in a MEMS-based power amplifier. This research demonstrates the feasibility of creating MEMS resonators which can withstand such voltages without succumbing to electrical pull-in, focusing on careful device design informed by FEM simulation.

Project end date: 02/01/11

BPN572: Decentralized TSCH Scheduling for a Floating Wireless Sensor Network

Andrew Tinka
Kevin Weekly
Thomas Watteyne
2011

The Floating Sensor Network system is a fleet of robotic sensor packages with water quality sensors, GPS receivers, and 802.15.4 wireless communication modules. They are deployed in riverine and estuarine environments to observe the water flow and propagation of constituents such as salt, nitrates, and other contaminants. Their observations will be used for real-time estimates and forecasts of the system state. The connectivity is dynamic and unpredictable, making a centralized scheme challenging. Our project will develop networking algorithms and methods to enable reliable...

BPN576: Off-the-Shelf Sensors for Wireless Smart Home Applications

Alex Sun
James Peng
Edmund Ye
Thomas Watteyne
2010

The goal of this project is to show proof of concept that, with widely available and relatively inexpensive off-the-shelf sensors, wireless low-power sensor networks can be easily created and integrated into everyday life. The eventual objective is to equip a house with a wide variety sensors and actuators, allowing a user to wirelessly monitor and control his or her home. Installation should be easy and flexible enough so that the wireless motes of the network can be added on to any pre-existing structure.

Project end date: 02/04/11

BPN597: QES: Design and Optimization of Passive Wireless Implantable Pressure Sensors

Neel K. Shah
Mozziyar Etemadi
Rishi Kant
2011

Inductor design for passive wireless implantable use presents several challenges not currently addressed. A small form factor is desired for minimally invasive implantation and monitoring, and a low frequency is necessary for effective through-body power transfer. However a small inductor area limits effective power transfer and low-frequency operation. It is thus necessary to optimize the inductor for maximal power transfer while satisfying tight area and low frequency constraints. We present a design methodology for planar circular spiral inductors used with capacitive pressure...

BPN358: Micromechanical Transmit Filter

Li-Wen Hung
2011

The ever-increasing appetite for wireless interconnectivity is beginning to drive new functions, like frequency gating spectrum analysis, that in turn drive a need for GHz resonators with si-multaneous high Q (>30,000) and low impedance (<200 Ohm). No single on-chip resonator device can deliver such performance in this frequency range to date. To achieve simultaneous high Q and low impedance, either the impedance of capacitive resonators must be lowered, or the Q's of piezoelectric resonators must be raised. This project investigates methods for increasing quality factor of...

BPN470: Low Power All-Digital Transceiver for Wireless Sensor Network

Richard Y. Su
2011

Radios available today are designed to be high performance devices, and they consume about 30mW (CC1101). We would like to demonstrate an all-digital transceiver using only standard cell library components. This new design paradigm will focus mainly on low cost, ease of design, portability, and also decent performance. This transceiver will operate somewhere between 50 MHz and 1000 MHz, and it will have reasonable sensitivity and wide-band linearity across this band with low power consumption. No passive components, except for capacitors, will be used. The goal of this is to develop...

BPN607: Long-Term Stability in MEMS-Based Oscillators

Brian Pepin
2011

The objective of this project is to accurately determine long-term frequency stability (i.e. frequency aging) of small-gap capacitive micro-electro-mechanical (MEMS)-based oscillators. This will be accomplished by creating a measurement setup where the oscillator is in a completely stabilized environment, the resonator is hermetically sealed into a clean enclosure, a “burn-in” is completed step to pre-age the device, and other precautions are taken as necessary for a detailed study of the aging process.

Project end date: 02/05/12

BPN613: High-Order UHF Micromechanical Filters

Turker Beyazoglu
Henry Barrow
2011

The use of MEMS-based resonators for frequency filtering has been promising for achieving single- chip superheterodyne transceivers. For use in communications, filters having large out-of-band rejections and sharp rolloffs are required which necessitates their high-order implementation, yet filters having more than 3 resonators have not been achieved due to their high susceptibility of passband distorting effects. This project aims to realize higher order micromechanical filters to achieve better selectivity and stopband rejection at UHF range.

Project end date: ...

BPN477: OpenWSN: Open-Source Standards-Based Protocol Stacks for Wireless Sensor Networks

Thomas Watteyne
2010

We are building a multi-platform, multi-operating system, fully standards-compliant interoperable wireless sensor network stack. Major standardization bodies have been looking at how wireless multi- hop networks should operate reliably (IEEE 802.15.4E, IETF RPL), how they can integrate within the Internet (IETF 6LoWPAN), and how utilities and end users should interact (OpenADR). All of these standards are being finalized. The OpenWSN project aims at federating these standards into a fully- functional protocol stack, at implementing these on a number of hardware and software platforms...