Tunable RF Antennas and Filters for Advanced Communication Systems and Wideband Quasi-Optical Network Analyzer for Millimeter-Wave and Terahertz Applications
2015
Online
Elektronische Ressource
The dissertation comprises of four projects; double bow-tie slot antennas for wideband millimeter-wave and terahertz applications, a 100 − 300 GHz free-space scalar network analyzer using compact Tx and Rx modules, a tunable dual-band quadruple-pole antenna for carrier aggregation systems, and RF MEMS tunable 4-pole bandpass filters with bandwidth control and improved stopband rejection. The dissertation first presents millimeter-wave and THz double bow-tie slot antennas on a synthesized elliptical silicon lens. Two different antennas are designed to cover 0.1 − 0.3 THz and 0.2 − 0.6 THz, respectively. The double bow-tie slot antenna results in a wide impedance bandwidth and 78-97% Gaussian coupling efficiency over a 3:1 frequency range. A wideband CPW low-pass filter is designed using slow-wave techniques, and the measured filter response shows an S21 < -25 dB over a 3:1 frequency range. Absolute gain measurements done at 100 – 300 GHz and 200 − 600 GHz confirm the wideband operation of this design. The double bow-tie slot antenna is intended to fill the gap between standard double-slot antennas and log periodic and sinuous antennas, with applications areas in radio astronomy and imaging systems.In chapter 3, the dissertation presents a 100 − 300 GHz quasi-optical network analyzer using compact transmitter and receiver modules. The transmitter includes a wideband double bow-tie slot antenna and employs a Schottky diode as a frequency harmonic multiplier. The receiver includes a similar antenna, a Schottky diode used as a sub-harmonic mixer, and an LO/IF diplexer. The 100 − 300 GHz RF signals are the 5th to 11th harmonics generated by the frequency multiplier when an 18 − 27 GHz LO signal is applied. The measured transmitter conversion gain with Pin = 18 dBm is -35 to -59 dB for the 5th to 11th harmonic, respectively, and results in a transmitter EIRP of +3 dBm to -20 dBm up to 300 GHz. The measured mixer conversion gain is -30 to -47 dB at the 5th to 11th harmon
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Tunable RF Antennas and Filters for Advanced Communication Systems and Wideband Quasi-Optical Network Analyzer for Millimeter-Wave and Terahertz Applications
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Autor/in / Beteiligte Person: | Alazemi, Abdullah J. |
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Veröffentlichung: | 2015 |
Medientyp: | Elektronische Ressource |
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