Enhancement of Tools for Design of Antennas for Mobile Devices 2003 Clemson SURE Program Presented By: Robert J. Loeven Advisor: Dr. Anthony Martin

Modern Mobile Device Antennas Very Small Multi-Band Used in Cell Phones, Wireless Laptops, etc. PIFA – Planar Inverted F-type Antenna

Project Goals Use MATLAB to model antenna structures and performance, using Makarov programs Antenna and EM Modeling, Sergey N. Makarov, John Wiley and Sons Inc Alter Makarov programs to show more detail and enhance quality of output Use new programs to analyze antennas, specifically patch antennas designed for cell phones and wireless notebook connections

Triangular Surface-Patch Meshes and the Rao-Wilton-Glisson Basis Functions First requires a 3D “Mesh” antenna structure which can be created using MATLAB PDE Toolbox Plate Example

Equations Surface Currents – Current Interpolation

Bowtie Example to Demonstrate Color Modifications in RWG5.m and plotcurr5.m

Bowtie – RWG5 - Old vs. New

Bowtie Example – New Plotcurr5 Output

3D Far-Field Patterns: Old Efield2.m

New Efield3D.m with Antenna and Transparency

Efield3D.m 3D Rotation

Simulated Dipole Frequency Sweep

Dipole Frequency Demonstration λ/2 (75MHz) λ (150MHz) 3λ/2 (225MHz) 2λ (300 MHz)

Patch Antenna Design Simulation

Frequency Sweep Results 500 MHz to 6 GHz

Current Distribution at 2 GHz

Patch Antenna E-Field

Patch E-field with Antenna Included

E-Shaped Patch Antenna Simulation

E-Shape Analysis

E-Shape Surface Currents

E-Shape 3D E-Field

E-Shape 3D with Antenna Included

Future Work Speed up code by using matrix interpolation Modify plotcurr5.m code to work in 3D Modify codes to allow for the inclusion of dielectric materials into the antennas Use program to simulate and study real world antenna designs