Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 64 for “"mm-wave"”.
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Pulsed mm-Wave electron cyclotron maser experiments
… was developed and used to generate high power mm-waves in the W-band (75-110GHz) and the G-band (150-220GHz) frequency ranges. The relativistic electron beam (R. E. B.) was produced from a field-immersed, field-emission, cold cathode. A shaped anode cavity was designed for the optimum cavity Q, …
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Design and Reliability of mm-Wave Circuits In Silicon-Germanium
… develop a methodology for the design of RF and mm-Wave circuits in Silicon-Germanium utilizing CMOS, PIN diodes, and passive circuits. Such circuits consist of a 2-20 GHz CMOS-based TR (Transmit/Receive) SPDT switch and an 18-47 GHz Wilkinson Power Divider-Combiner (WPDC). Optimal design …
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Self-aligned AlGaN/GaN transistors for sub-mm wave applications
This thesis describes work done towards realizing self-aligned AlGaN/GaN high electron mobility transistors (HEMTs). Self-aligned transistors are important for improving the frequency of AlGaN/GaN HEMTs by reducing source and drain access resistance. The eventual fabrication of self-aligned …
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Dynamic control of plasma photonic crystals in the mm-wave region
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2027-08-01
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Limiting physics of mm-wave InP power high electron mobility transistors
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998.
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Broadband mm-wave signal generation and amplification in CMOS using synthetic impedance
This thesis explores the concept of synthesizing tunable impedances by establishing the appropriate phase relationship between the drain voltage and drain current of a MOS transistor. A high frequency, wide tuning range 105-121GHz oscillator and a small-footprint 20-40GHz oscillator using synthetic …
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Advanced Manufacturing and Dielectric Material Characterization Techniques for High-Temperature mm-Wave Antennas
… create a multilayer configuration of a coplanar waveguide (CPW).</p> <p>Performing RF probing on the CPW structure and measuring its S-parameters allows for the determination of the permittivity by extracting the propagation characteristics and then performing an analysis with conformal mapping …
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Power supply switching for a mm-wave asymmetric multilevel outphasing power amplifier system
… power switches to be used in our new Asymmetric Multilevel Outphasing (AMO) transmitter architecture at mm-wave frequencies. The AMO topology breaks the linearity vs. efficiency design objective in radio frequency power amplifiers (PAs) which has until now appeared to be fundamental. …
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Power efficient Transmit/Receive (T/R) Elements for Integrated mm-Wave Phased Arrays
Thanks to a small wavelength (large bandwidth) combined with a low loss transmission window around 94 GHz and 120 GHz, the 75-120 GHz frequency band in millimeter wave (mm-wave) provides a promising opportunity for high data rate long range wireless communications and high-resolution imaging …
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Optical generation of mm-wave signals for use in broadband radio over fiber systems
… is a very attractive technology to deliver microwave and millimeter-wave signals containing broad band multimedia services to numerous base stations of the network. The radio signals are placed on an optical carrier and distributed by means of an optical fiber network to the base stations (BS). …
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Analysis and Design of Wide Tuning Range Low Phase Noise mm-wave LC-VCOs
… and move towards multi-band/multi-channel mm-wave systems to satisfy latest specifications and be compatible with legacy standards. One of the critical components, the LC-voltage controlled oscillator (LC-VCO), is required to have low phase noise while maintaining wide tuning range to …
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Dynamic plasma photonic crystals: multidimensional electromagnetically active artificial structures in the mm-wave and thz regimes
… material that can be formed in sub-mm cavities with high electron densities (10^14-10^17 cm^-3). The permittivity of microplasma is readily modulated through the electron and neutral gas number densities, making microplasma inherently applicable to photonic crystal (PC) applications. …
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Millimeter-Wave Harmonically-Tuned Silicon Power Amplifiers for High Efficiency
… the inverse-Class-F harmonic tuning approach for mm-wave silicon PAs. This research addresses the challenges and limitations of the high efficiency inverse-Class-F PAs for mm-wave silicon technology. This work proposes different load networks to mitigate the challenges which are verified with …
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A FIR Filter Embedded Millimeter-wave Front-end for High Frequency Selectivity
Millimeter wave (mm-Wave) has become increasingly popular frequency band for next-generation high-speed wireless communications. In mm-Wave, the wireless channel path loss is severe, demanding a high output power in transmitters (Tx) to meet a required SNR in receivers (Rx). Due to the intractable …
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Radio over fibre distribution systems for ultra-wide band and millimetre wave applications
… as ultra-wideband (UWB) and 60 GHz millimetre wave (mm-wave) play a key role for wireless connectivity in indoor home, office environment or large enclosed public areas. UWB has been allocated at the frequency band 3.1-10.6 GHz with an emission power below -41.3 dBm. Mm-wave signals around 60 …
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Submillimeter heterodyne spectroscopy of star forming regions
The sub-mm wave portion of the electromagnetic spectrum is on the frontier of both scientific and technical research in astrophysics. Being a relatively young field, scientific advancement is driven by advancements in detector technology. In this thesis, I discuss the design, construction, testing …
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An Introduction to Local Multipoint Distribution Services with an Investigation of the Effects of Vegetation on the Radio Channel
… made available for LMDS technologies. After summarizing the basics of LMDS, we will compare it with some competing technologies. The reader will then be guided through the aspects of millimeter (mm) wave radio link design. This should be a good lead into the experiment section, since it is …
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Chirped-pulse millimeter-wave spectroscopy, dynamics, and manipulation of Rydberg-Rydberg Transitions
The chirped-pulse millimeter-wave (CPmmW) technique is applied to transitions between Rydberg states, and calcium atoms are used as the initial test system. The unique feature of Rydberg{Rydberg transitions is that they have enormous electric dipole transition moments: ~5 kiloDebye at n* ~45, where …
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Silicon-based Microwave/Millimeter-wave Monolithic Power Amplifiers
… increased interest in exploring high frequency (mm-wave) spectrum (particularly the 30 and 60 GHz ranges), and utilizing silicon-based technology for reduced-cost monolithic millimeter integrated circuits (MMIC), for applications such as WLAN, inter-vehicle communication (IVC) automotive radar …
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Propagation and scattering of beam waves in vegetation using scalar transport theory
… a significant role in the propagation of microwave and millimeter (mm)-wave signals through foliage. At frequencies above 1 GHz,both the coherent and incoherent field components have to be taken into account and vegetation has to be modeled as a random medium of discrete scatterers having a …
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