Numerical Study on Frequency Up-conversion in USPR using MATLAB
- Authors
- Roh, Young-Su
- Issue Date
- Sep-2010
- Publisher
- KOREAN INST ELECTR ENG
- Keywords
- Chirped waveform; Frequency bandwidth; Frequency up-conversion; Method of stationary phase; Ultrashort-pulse reflectometry
- Citation
- JOURNAL OF ELECTRICAL ENGINEERING & TECHNOLOGY, v.5, no.3, pp.497 - 502
- Journal Title
- JOURNAL OF ELECTRICAL ENGINEERING & TECHNOLOGY
- Volume
- 5
- Number
- 3
- Start Page
- 497
- End Page
- 502
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/14671
- ISSN
- 1975-0102
- Abstract
- In this paper, the O-mode ultrashort-pulse reflectometry (USPR) millimeter-wave signals that propagate into the plasma and cover a frequency bandwidth of 33-158 GHz are examined numerically using MATLAB. Two important processes are involved in the computation: the propagation of the USPR impulse signal through a waveguide and the frequency up-conversion using millimeter-wave mixers. These mixers are limited to intermediate frequency signals that are less than 500 mV; thus, it is necessary to disperse the impulse signal into a chirped waveform using the waveguide. The stationary phase method is utilized to derive a closed-form formula for a chirped waveform under the assumption that the USPR impulse is Gaussian. In the process of frequency up-conversion, the chirped waveform is mixed with the mixer LO signal, and the lower frequency components of the RF signal are removed using high pass filters.
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Collections - College of Engineering > School of Electrical Engineering > 1. Journal Articles
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