Presentation Type
Poster
Creating a Broader Bandwidth Antenna for Global Navigation Satellite Systems
Abstract
Global Positioning Systems currently exist in a bandwidth that limits their accuracy, but the Global Navigation Satellite System is allowing more signals that can broaden the bandwidth and increase the accuracy of the current systems. A receiver is needed to be able to support a larger bandwidth of frequencies; yet, commercially available antennas fail to offer a physically compact design. Dual-band coupled double loop antennas can be used in an array to provide a minimal physical size and still be capable of receiving the desired bandwidth of frequencies. The focus of this research is to build and test a quadrature hybrid coupler, utilizing a series capacitor and shunt inductor design, that produces a 90 degree phase shift in signals. A single stage design will provide the desired phase shift, but with a limited bandwidth; a double stage design will offer a larger bandwidth, and employing a phase inverter will additionally increase it. The signals in phase-quadrature will be arranged orthogonally to achieve right hand circular polarization in the antenna, which will allow a small physical design with the ability receive a large bandwidth of frequencies.
Categories
Engineering/Physical Science
Research Type
Research Assistant
Mentor Information
Dr. Tom Weller
Creating a Broader Bandwidth Antenna for Global Navigation Satellite Systems
Global Positioning Systems currently exist in a bandwidth that limits their accuracy, but the Global Navigation Satellite System is allowing more signals that can broaden the bandwidth and increase the accuracy of the current systems. A receiver is needed to be able to support a larger bandwidth of frequencies; yet, commercially available antennas fail to offer a physically compact design. Dual-band coupled double loop antennas can be used in an array to provide a minimal physical size and still be capable of receiving the desired bandwidth of frequencies. The focus of this research is to build and test a quadrature hybrid coupler, utilizing a series capacitor and shunt inductor design, that produces a 90 degree phase shift in signals. A single stage design will provide the desired phase shift, but with a limited bandwidth; a double stage design will offer a larger bandwidth, and employing a phase inverter will additionally increase it. The signals in phase-quadrature will be arranged orthogonally to achieve right hand circular polarization in the antenna, which will allow a small physical design with the ability receive a large bandwidth of frequencies.
