Thesis
RF/microwave analog Hilbert transformer and its applications in real-time analog signal processing
Washington State University
Master of Science (MS), Washington State University
05/2021
DOI:
https://doi.org/10.7273/000000071
Handle:
https://hdl.handle.net/2376/111254
Abstract
Real-time analog signal processing on the passband modulated signals in the radio frontend system can support the ever-desired demand for faster, reliable, and ubiquitous radio systems
for application in microwave and millimeter-wave engineering. Microwave analog signal
processing is defined as the manipulation of signals in their pristine analog form in real-time.
RF/Microwave Hilbert transformer is one of many blocks to support real-time analog signal
processing on passband modulated signals. In this thesis, a uniplanar microstrip line
RF/microwave real-time analog signal processing unit has been proposed to operate concurrently
at two frequencies for spectrum aggregation applications. First, a fundamental building block -
novel microstrip line dual-band Hilbert transformer (DBHT) is developed by integrating a dualband 180° coupler and a dual-band delay line. The theoretical analysis is carried out to determine
the relation of coupler and delay line forming closed loop resonance in proposed circuit topology.
Instead of working at dual-band only, a varactor-based tunable microstrip line Hilbert transformer
have also been proposed making the 180° coupler and the delay line tunable at the same time. Then, a dual-band edge detector from DBHT and a dual-band single-sideband (DBSSB) modulator
composed of dual-band power divider/ combiner, DBHT, and dual-band delay line are developed
for dual-band real-time RF/microwave signal processing applications. To verify the proposed
concept, a prototype of microstrip line DBHT working at 0.9 GHz and 1.98 GHz is designed, and
the measurement and simulation results agree well with theoretical analysis. A frequency
reconfigurable varactor-based tunable Hilbert transformer has been simulated within 2.25 GHz to
2.7 GHz frequency range. To demonstrate the real-time RF/microwave analog signal processing,
a dual-band edge detector composed of DBHT is verified in experiment. Furthermore, a prototype
of microstrip line DBSSB modulator is fabricated and validated in experiment to demonstrate the
real-time single sideband modulation at concurrent two RF/microwave frequencies.
Metrics
82 File views/ downloads
48 Record Views
Details
- Title
- RF/microwave analog Hilbert transformer and its applications in real-time analog signal processing
- Creators
- Rakibul Islam
- Contributors
- PRAVEEN K SEKHAR (Degree Supervisor) - Washington State University, Engineering and Computer Science (VANC), School ofTUTKU KARACOLAK (Committee Member) - Washington State University, Engineering and Computer Science (VANC), School ofANNA WISNIEWSKA (Committee Member) - Washington State University, Engineering and Computer Science (VANC), School of
- Awarding Institution
- Washington State University
- Academic Unit
- Engineering and Computer Science (VANC), School of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University
- Format
- PDF
- Number of pages
- 60
- Identifiers
- 99900586063801842
- Language
- English
- Resource Type
- Thesis