Type Ultrabroadband Microwave and Millimeter-wave Arbitrary Waveforms: Photonic-Assisted Generation and Radio-Frequency Applications
Abstract
Ultrabroadband microwave and millimeter-wave signals offer significant potentials for various applications from ultrahigh-speed communications to high-resolution ranging and electromagnetic imaging. The key challenge in advancing these technologies is generating broadband programmable waveforms centered at such high frequencies. Electronic RF arbitrary waveform generation (RF-AWG) typically suffers from limited digital-to-analog converter speed and high timing jitter, which is why, over the past couple of decades, researchers have shifted their attention toward robust photonic-assisted RF-AWG schemes. In this dissertation, we first present a novel photonic strategy to generate programmable waveforms in the microwave, millimeter-wave and even sub-terahertz frequency regimes. Mathematical and experimental analyses confirm the superiority of our technique over its electronic and photonics-based counterparts in terms of bandwidth, center frequency, time-bandwidth product, stability and timing jitter. Furthermore, a simple modification of the presented RF-AWG setup is introduced that enables immediate incorporation of real-time data modulation on the generated programmable RF waveforms for high-speed communication and time-aperture expansion applications. We then employ our RF-AWG waveforms in a W-band (75-110 GHz) high-resolution ranging experiment, achieving an unprecedented depth resolution of 3.9 mm. Finally, a mathematical and experimental assessment of temporal and spatial focusing of single- and multiple-antenna ultra-wideband systems in highly-dense multipath environments is carried out by means of RF arbitrary waveform generation.
Degree
Ph.D.
Advisors
Weiner, Purdue University.
Subject Area
Engineering
Off-Campus Purdue Users:
To access this dissertation, please log in to our
proxy server.