Photoconductive switching using silicon and its applications in antennas and reconfigurable metallodielectric Electromagnetic Band Gap (EBG) structures
thesisposted on 01.08.2018 by Alford Chauraya
In order to distinguish essays and pre-prints from academic theses, we have a separate category. These are often much longer text based documents than a paper.
The aims of this research work were to investigate the microwave properties of photoconductive semiconductor switches (PCSS), and how the properties might be used to optically control microwave and millimetre wave devices. Tunable devices (such as antennas, filters and metamaterials) have the ability to increase flexibility performance in multiband systems for example. In this thesis the performance of microwave switches from microstrip discontinuities, with high resistivity silicon dice placed cross the gaps were investigated. Under optical illumination, the electrons in silicon can be excited from the valence band to the conduction band. This photoconductivity in silicon has been employed to design a small microwave switch that can be operated using optical signal. The optically activated switch offers a wide range of applications. Potential applications have been demonstrated in integrating the microswitch in microstrip patch antenna, microstrip couple line filter, and Electromagnetic Band Gap (EBG) structures.
Science and Technology Facilities Council, Rutherford Appleton Laboratories (RAL). Scrubbs and Usaramo Estates (Zimbabwe). European Space Agency (ESA). Antrum Ltd (Loughborough).
- Mechanical, Electrical and Manufacturing Engineering