Compact microwave devices based on nonlinear transmission line and substrate integrated waveguide
Item
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Title
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Compact microwave devices based on nonlinear transmission line and substrate integrated waveguide
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Identifier
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d_2009_2013:4776cae7317f:11242
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identifier
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11355
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Creator
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Tang, Wenjia,
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Contributor
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Jizhong Xiao
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Date
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2012
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Language
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English
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Publisher
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City University of New York.
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Subject
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Electrical engineering | compact | delay line | frequency translator | left-handed
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Abstract
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Nonlinear transmission line (NLTL) and substrate integrated waveguide (SIW) are the most popular integration techniques in microwave area, which have a wild application in the military, civil and robot wireless communication systems. The motivation to apply these technologies to microwave devices is to reduce the physical size, improve integration and achieve superior electrical performance. My research areas cover phase shifter, delay line, frequency translator, power divider and antenna design.;I am the first one to introduce the theory of perfectly linear phase shifter by using a specially doped diode in left-handed (LH) NLTL. Through creating an equivalent Advanced Design System (ADS) model, we prove this theory by the simulation results and the results agree with the theory well. This novel LH NLTL technology is also used in the delay line for the first time to make a fabricated circuit with compact size and decent electrical performance. Another innovative application of LH NLTL in our study is to incorporate it in frequency translators by taking advantage of its linear phase variation to get broad bandwidth, low spurs and low cost. Compared with LH NLTL, right-handed (RH) NLTL is also widely used and featured with low insertion loss. By replacing e/4 section lines in a conventional Wilkinson power divider with RH NLTL, a compact and frequency tunable Wilkinson power divider is presented for the first time. The proposed circuit has excellent performance with less than 3% of the physical volume of the original Wilkinson power divider structure.;For the later part of our research work, a Substrate Integrated Waveguide (SIW) cylinder conformal multi-beam antenna fed by a conformal Butler matrix is originally proposed and realized. The slot array antennas and Butler matrix are fabricated on a single substrate to reduce the size, weight and cost, and enhance the manufacture reliability concurrently. Furthermore, the far-field pattern algorithm for cylinder conformal antenna is proposed and its calculation result agrees with experimental data.
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Type
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dissertation
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Source
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2009_2013.csv
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degree
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Ph.D.
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Program
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Engineering
