NDLTD logo NDLTD Union Catalog and Global ETD Search

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.

Results

Showing 1 to 20 of 40 for “"W-band"”.

  1. Design of an overmoded W-Band coupled cavity TWT

    Comfoltey, Edward NicholasMassachusetts Institute of Technology2009

    … High power sources at frequencies from the W-Band (70 to 110 GHz) to the THz frequency range are needed for numerous applications including radar, DNP/NMR spectroscopy, and homeland security. The novel TWT design operates in the TM31 mode, of a rectangular cavity, and has transverse dimensions …

    mit Repository record

  2. Reliability of W-Band InAIN/GaN High Electron Mobility Transistors

    Wu, Yufei, Ph. D. Massachusetts Institute of Technology. Department of Electrical Engineering and Computer ScienceMassachusetts Institute of Technology2017

    AlGaN/GaN High Electron Mobility Transistors (HEMTs) have enjoyed tremendous market growth in RF power amplifiers over the past decades. In the quest for enhancing the operating frequency of GaN HEMTs, there has been a great effort to scale down the gate length. Maintaining acceptable short-channel …

    mit Repository record

  3. Impedance measurements at W-band using an array of bismuth microbolometers

    Kessler, Joel RobertUniversity of Illinois at Urbana-Champaign2011

    … on a coplanar waveguide (CPW) is measured at W-band (75-110 GHz) using an array of bismuth microbolometers placed over the CPW. From this information, the impedance of the load at the end of the line can be determined in addition to the propagation and attenuation constant of the CPW.

    uiuc Repository record

  4. Pseudomorphic and metamorphic HEMT-technologies for industrial W-band low-noise and power applications

    Grünenpütt, Jan ErikUniversität Ulm

    ulm-diss Repository record

  5. Design and Development of Planar Antennas and Dielectric Devices for use at W Band Frequencies

    Deegan, MarkNational University of Ireland Maynooth2018

    … of planar antennas for observations at W band frequencies. A large portion of this analysis is based on the specific development of devices as part of an ESA research package entitled “New Technology High Efficiency Horn Antennas for CMB Experiments and Far-Infrared Astronomy”. The …

    maynooth Repository record

  6. Design, fabrication and testing of a novel W-band monolithic millimetre-wave integrated circuit mixer

    Broadfoot, StephenUniversity of Glasgow1999

    Abstract available: p. [1]

    glasgow Repository record

  7. Room temperature micromachined microbolometers for W-band (75 GHz-110 GHz) focal plane imaging array

    Rahman, Arifur, 1970-Massachusetts Institute of Technology1996

    Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.

    mit Repository record

  8. Design and Simulation of a Two-Dimensional Beam Steered Millimeter-Wave Phased Array Antenna at W-Band (75 – 110 GHz, respectively 4 – 2.7 m)

    Alfadreek, Assadeg2024

    … interference while making the most of available bandwidth. This is because they can dynamically aim their primary beam (the strongest possible radiation) in the direction of the target.<br/><br/>The front end of a 75 GHz phased array antenna that supports electronic beam steering in two …

    southwales Repository record

  9. Power efficient Transmit/Receive (T/R) Elements for Integrated mm-Wave Phased Arrays

    Afroz, SadiaVirginia Tech2017

    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 …

    vt Repository record

  10. Evaluation of triple-frequency radar retrieval of snowfall properties using coincident airborne in-situ observations during olympex

    Chase, Randy J.University of Illinois at Urbana-Champaign2018

    … particles occupy distinct regions of the Ku-Ka-W-band Dual-Frequency Ratio (DFR) plane. Furthermore, ground-based observations suggest that particle bulk density and characteristic size can be retrieved from the DFR plane. This is the first study to evaluate the retrieval of particle shape, bulk …

    uiuc Repository record

  11. CMOS Power Device Modeling and Amplifier Circuits

    Chan, Doris A.University of Illinois at Urbana-Champaign2011

    … RF front-end in transmitters for a local broadband network. Today, commercial PAs are made of III-V HEMT and HBT technology with excellent results. An integrated system-on-chip power amplifier circuit using CMOS technology for cost-effective and spectrum-efficient high-speed wireless …

    uiuc Repository record

  12. Electron paramagnetic resonance spectroscopic study of two gadolinium centres at calcium sites in synthetic fluorapatite

    Chen, NingUniversity of Saskatchewan2002

    … as single crystals and powder samples by using X-band (9.5 GHz) and W-band (95 GHz) electron paramagnetic resonance (EPR) spectroscopy. Gd₂O₃ with natural abundances of isotopes and ¹⁵⁷Gd-enriched Gd₂O₃ were used in the crystal synthesis. The X-band spectra obtained for the Gd-doped fluorapatite …

    sask Repository record

  13. A FIR Filter Embedded Millimeter-wave Front-end for High Frequency Selectivity

    Kim, HyunchulVirginia Tech2019

    … 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 speed-power …

    vt Repository record

  14. Pulsed mm-Wave electron cyclotron maser experiments

    Spark, Stephen N.University of Strathclyde1988

    … 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, resonant …

    strathclyde Repository record

  15. 3D Micromachined Passive Components and Active Circuit Integration for Millimeter-wave Radar Applications

    Oliver, John MarcusVirginia Tech2012

    … comparator IC, and a series of V- and W-band corporate combining structures for use in transmitter power combining applications. The 94 GHz cavity-backed antennas based on a rectangular coaxial feeding network have been designed, fabricated, and tested. 13 dB gain for a 2 x 2 array, as …

    vt Repository record

  16. Calibration and validation for CubeSat Microwave Radiometers

    Crews, Angela B.(Angela Beth)Massachusetts Institute of Technology2019

    … 12-channel passive microwave radiometer in W-band, F-band, and G-band.

    mit Repository record

  17. Ion -Implanted GaAs MESFET MMICs for 77-Ghz Automotive Radar

    Shimon, Robert LeonUniversity of Illinois at Urbana-Champaign2015

    … with comparisons to measured data through W-band. This work then presents measured and simulated performance characteristics of the MMICs. A three-stage amplifier exhibits 8 dB of gain, and each diode and FET-based mixer exhibits less than 15 dB of conversion loss at 77 GHz. These results …

    uiuc Repository record

  18. Design and test of a 94 GHz overmoded traveling wave tube amplifier

    Kowalski, Elizabeth J. (Elizabeth Joan)Massachusetts Institute of Technology2015

    … discusses the design and test of an overmoded W-band Traveling Wave Tube (TWT). The TWT was designed to operate in the rectangular TM31 cavity mode at 94 GHz. The unwanted lower order, TM₁₁ and TM₂₁, modes were suppressed using selectively placed aluminum nitride dielectric loading. Simulations …

    mit Repository record

  19. Results from the QUIET Q-Band Observing Season

    Dumoulin, Robert Nicolas2011

    … Background (CMB) in the Q and W frequency bands (43 and 95 GHz respectively) using coherent polarimeters. From 2008 October to 2010 December, data from more than 10,000 observing hours were collected, first with the Q-band receiver (2008 October to 2009 June) and then with the W-band …

    columbia-diss Repository record

  20. Design/System Technology Co-optimization of Gallium Nitride High Electron Mobility Transistors for Next-G 3DIC Heterogeneous Integration of Gallium Nitride and Si CMOS

    Yadav, Pradyot SinghMassachusetts Institute of Technology2024

    … RF front ends. To design the most efficient W-G Band devices and systems, we must embrace a design/system-technology co-optimization (DTCO/STCO) approach, that combines innovative GaN transistors with engineered linearity, novel heterogeneous integration with state-of-the-art Silicon (Si) bias …

    mit Repository record

Page 1 of 2