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An ultra-wideband transmit/receive module using 10 to 35 GHz six-channel microstrip multiplexers and its applications to phased-array antenna transceiver systemsHong, Seung Pyo 30 October 2006 (has links)
This dissertation introduces new and simple techniques for suppression of multispurious
passbands, which are inherent to the conventional microstrip parallel coupleline
bandpass filters. In addition, the operation of harmonic suppression is analyzed
using a simple model.
Special emphasis is placed on the applications of several new filter designs for
microstrip diplexers and multiplexers. Compact, full-duplex beam scanning antenna
transceiver systems with extremely broad bandwidth have also been developed.
Recent advances in broadband monolithic microwave integrated circuit (MMIC)
amplifiers make the realization of extremely broadband phased-array transceiver systems
possible. The ultra-wideband phased-array transceiver systems can be used in multi-band
mobile satellite communication systems and wideband radars. This dissertation presents
a multi-band, compact, full-duplex, beam scanning antenna transceiver system for
satellite communications and two designs of ultra-wideband, low-cost radar systems as
applications of the MMIC amplifiers. In addition, a multi-frequency antenna has been developed. A single-feed triple
frequency microstrip patch antenna is presented as an answer to the recent demand for
multi-function systems in the wireless communications.
In summary, the research presented in this dissertation covers every component
required to build an ultra-wideband, full-duplex beam scanning phased-array antenna
transceiver. The work done in this dissertation should have many applications in the
wireless communication systems and wideband radar technologies.
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Millimeter-wave integrated circuit design in silicon-germanium technology for next generation radarsSong, Peter 08 June 2015 (has links)
In this thesis, the circuits which comprise the front-end of a millimeter-wave transmit-receive module are investigated using a state-of-the-art 90 nm SiGe BiCMOS process for use in radar remote sensing applications. In Chapter I, the motivation for a millimeter-wave radar in the context of space-based remote sensing is discussed. In addition, an overview of Silicon-germanium technology is presented, and the chapter concludes with a discussion of design challenges at millimeter-wave frequencies. In Chapter II, a brief history of radar technology is presented - the motivations leading to the development of the transmit-receive module for active electronically scanned arrays are discussed, and the critical components which reside in nearly every high-frequency transmit-receive module are introduced. In Chapter III, the design and results of a W-band single-pole, double-throw switch using SiGe p-i-n diodes are discussed. In particular, the design topology and methods used to achieve low-loss and high power handling over a wide matching bandwidth without sacrificing isolation are described. In Chapter IV, the design and results of a W-band low-noise amplifier using SiGe HBT's are discussed. The design methodologies used to achieve high gain and exceptional noise performance over a wide matching bandwidth are described. Concluding remarks and a discussion of future work are in Chapter V.
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