Electromechanical modeling of microelectromechanical switches operating at microwave frequency

Funding source: Raytheon & UC MICRO Time period: 8/2/99 - 6/30/00

Project description: This project deal with the full wave analysis of MEMS switches for the development of a scalable lumped element library model for MEMS switches to be used in traditional CAD tools such as ADS or SPICE. The advantage of a scalable lumped element model versus full wave analysis is represented by the simplicity of use of such model in commercial CAD, and its scalability accordingly to the MEMS physical dimensions without the need of performing lengthy full wave analysis.

Mutual coupling of microstrip antennas for use in portable devices utilizing diversity combining communications

Funding source: Broadcom & UC-MICRO Time period: 8/7/00 - 6/30/01

Project description: This project attack the problem of packing small size antennas on a mobile terminal while keeping their mutual coupling at the lowest level. Several antenna structures and polarization schemes are used to achieve the goal. Full wave analysis based on our method of moment code (Alfios) is used during the research.

Target signature characterization for foliage penetrating radars

Funding source: Raytheon & UC MICRO Time period 8/2/99 - 6/30/02

Project description: This project analyze the target signature of different images obtained from penetrating radar, provided by Raytheon and try to use percolation theory to identify the source of the image

A Comprehensive CAD for the Electrical Characterization of ferroelectric Materials and a Novel Loss Reduction Technique Using Frequency Spread Loss Distribution

Funding source: DARPA Time period: 12/01/99 - 12/1/02

Project description: In this project we continue our effort on the development of low loss ferroelectric materials in thin ceramic form for the realization of phase shifters operating at microwave frequency. The use of spread loss principle was first introduced by our group and is used in this project to educe the loss in the material at the operating frequency. We also developed a numerical code for the analysis of cross section (2D) of FEM phase shifter to predict their performances at microwave frequency.

Design, fabrication, modeling, manufacturing of MEMS in magnetic hard disk drive
Fund source: Texas Instruments & UC SMART Time period: 7/1/00 - 6/30/02

Project description: This project deals with the integration of a MEMS micro motor in the hard disk drive head to increase the hard drive data storage capacity of approximate a factor x10. Currently the hard drive data storage capacity is limited by the mechanical movements of the head rather then the magnetic property of the disk drive. This project try to overcome this limitation by using MEMS technology.

Modeling of planar capacitors on multi-layer substrate using R-FDTD

Funding source: Conexant & UC MICRO Time period: 8/7/00 - 12/31/01
Project description: This project deals with the optimization of planar capacitors on printed circuit board for wireless application systems. Full wave analysis based on our finite difference time domain method is used for the analysis and optimization.

Performance evaluation of phased array versus Multi-element antenna for use in portable devices utilizing diversity combining communications architecture

Funding source: Broadcom & UC MICRO Time period 8/2/02 - 6/30/03

Project description: In this research we are try to find the most advantageous configuration among space diversity, polarization diversity, and angle diversity when an assigned area for the antenna elements is given. This a very interesting problem since there is not a unique answer to it and the solution may vary between different environments and different antenna area.

Optimization analysis of routing schemes for high speed digital differential signaling

Funding source: Conexant & UC MICRO Time period: 8/13/01 - 6/30/02

Project description: This project deals with the optimization of routing lines for high speed digital circuits. We mainly focused our attention on the integrity of differential signals as they go through different transitions between the different layers of the circuit. Full wave analysis based of finite element method is used for the optimization of these transitions.

Passive circuits and antennas in a package

Funding source: Skyworks & UC MICRO Time period : 8/2/02 - 6/30/03

Project description: In this project several passive circuits and components are designed to be integrated in the PCB laminate (FR-4) or in the system package. Among the various components we concentrate our effort in the design of band pass filters (GSM and WLAN) buluns structures, and small size antennas. The integration of passive components in the system package is a key technology toward the cost reduction of the system.

Full wave analysis of nonlinear dielectrics at microwave frequencies for the analysis and design of advanced communication systems

Funding source: DARPA Time period 3/16/01 - 3/15/03

Project description: In this project we extend the capabilities of the numerical codes that was previously developed under DARPA for the analysis and design of more complex circuits using ferroelectric materials. The new code will be able to handle three dimensional structure and perform full wave analysis of ferroelectric materials having nonlinear tensor dielectric permittivity. To our knowledge there are no numerical codes in the market place which are able to deal with this kind of problem.

Low cost phased array on printed circuit board using low temperature MEMS fabrication process

Funding source: DARPA Time period 2/6/03 - 2/5/06

Project description: This project utilize a novel MEMS technology that was developed in our research group for the deposition of microelectromechanical switches on standard printed circuit board and laminates substrates. This new technology will allow us to develop low cost high performance phased array systems for military and communication systems.

Development of 3D Microwave Imaging Technologies for Damage Assessment of FRP-Jacketed Bridge Columns

Funding source: CALTRANS Time period 7/02 - 12/04

Project description: In this project we are using planar phased array technology to reconstruct the cross section of cement bridge columns to asses their damage condition. A focused RF system operating at 5 GHZ is designed and built to validate the technique. We also developed a novel image reconstruction algorithm which allow us to reduce the noise in the reconstructed image and enhance the resolution of the system.

Analysis, design, and simulation of integrated adaptive multi-band and multi-polarization Micro-Electro-Mechanical (MEM) phased array antenna (PAA) system on printed circuit board substrate

Funding source: Edwards Air Force Base Time period : 6/03 - 6/04

Project description: This project utilize a novel MEMS technology that was developed in our research group for the design of high gain, steerable receiving antenna systems operating at 4.7 and/or 7.5 GHz bands, fixed and variable beam-width, for telemetry reception by aeronautical vehicles such as Orion P3, E9, C130 series or other large air craft in the DOD inventory.

Single Package Radio System with Embedded Passive Circuits

Funding source: Skyworks & UC Discovery Grant Time period : 2/3/04 – 2/3/05

Project description: In this project several passive circuits and components are designed to be integrated in the PCB laminate (FR-4) or in the system package. Among the various components we concentrate our effort in the design of band pass filters (GSM and WLAN) buluns structures, and diplexer. We also integrate the filtering function in the diplexer to eliminate component count.

MEMS reconfigurable antennas integrated with adaptive space-time processing algorithm for use in wireless MIMO systems

Funding source: National Science Fundation (NSF) Time period: 2004-2007

Project description: In this project we combine reconfigurable antenna architecture based on MEMS switches with space-time code to maximize the channel efficiency. The goal is to have a reconfigurable MIMO system where antenna pparameters and coding thechnique are changed on the fly based on the channel condition.

MIMO and other MEA techniques testbed development for the study of reconfigurable antenna technology

Funding source: Balsell program Time period: 2004-2005

Project description: In this project we use different antenna configurations and beam switching technique to maximize the channel efficiency. The goal of this project is to build a testbed for the evaluation of different antenna configurations for wireless network system.

Analysis, design, and simulation of integrated adaptive multi-band and multi-polarization Micro-Electro-Mechanical (MEM) phased array antenna (PAA) system on printed circuit board substrate

Funding source: Edwards Air Force Base Time period : 3/04 - 3/05

Project description: This project we utilize novel MEMS technology that was developed in our research group to design a dual frequency antenna system for telemetry applications.

Study of a miniature antenna for wireless networking and beam switching

Funding source: Broadcom & UC MICRO Time period: 12/31/04 - 12/31/05

Project description: In this project we analyze several small size antenna based on knot topology as buiding blocks for an array to perform beam switching function on a wireless lan operating at 2.4 GHz and 5.3 GHz

Mass sensitive detector for chemical and biological agents based on quasi-amorphous pezoelectric films

Funding source: NATO Time period: 2005 - 2007
Project description: In this project we use amorphous films and RF reflectometry to detect chemical agents.

Target radar signature

Funding source: L'Garde SBIR (phase 1) Time period: 1/1/06-1/6/06

Project description: In this project we use finite element method to predict the RCS of differenmt objects.