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 1090 for “"GHz"”.
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Experimental studies of novel accelerator structures at 11 GHz and 17 GHz
… testing at high power at both 11 and 17 GHz. A single-cell photonic band-gap (PBG) structure was designed with an inner row of elliptical rods (PBG-E) to reduce ohmic heating relative to a round-rod structure. The PBG-E structure was built and tested at high power at a 60 Hz repetition …
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Short-visible-wavelength GHz Display
… spots at 420nm with a 3dB bandwidth of 2GHz.
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Room temperature micromachined microbolometers for W-band (75 GHz-110 GHz) focal plane imaging array
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
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Indoor wide band radio wave propagation measurements and models at 1.3 ghz and 4.0 ghz
… measurement campaign was conducted at 1.3 GHz and 4.0 GHz inside four buildings, including a sports arena, a modern closed-plan office building, and two dissimilar, open-plan factories. Measurements were recorded at 57 locations using base station antenna heights of 1.7 meters and 4.0 …
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30 GHz Switchable Waveguide Antenna: Prototype Antenna Solution for 60 GHz Wi-Fi Protocol 802.11 ad
… of this thesis was to design an antenna for 60 GHz Wi-Fi protocol 802.11 ad. Due to high loss at this frequency, highly directional, narrow beam antennas are required. Therefore, for WLAN applications where hemispherical coverage is required, a multi-antenna-element solution is required. In …
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A low dispersion 2-GHz comparator
A low dispersion 2-GHz comparator is an essential part of the latest automated VLSI tester by Teradyne Inc. With each new and faster CMOS logic VLSI microchips, faster and more precise comparators are needed to verify that the static discipline is being met on the many pins of the integrated …
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Studies of novel 140 GHz gyrotrons
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1997.
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Antenna design for 2.4 GHz ISM band
The utilization of 2.4 GHz ISM band has experienced enormous growth in the last 5 years. A lot of research has been conducted on the design of antennas operating inside this band. The limited space on the circuit board for the RF module imposes a limit on the physical size available for the …
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A novel wideband 140 GHz gyrotron amplifier
… and experimental results of a wideband 140 GHz, 1 kW pulsed gyro-traveling wave amplifier are presented. The gyro- TWA operates in the HE(0,6) mode of a novel cylindrical confocal waveguide using a gyrating electron beam. The electromagnetic theory, interaction theory, design processes and …
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Design of a 250 GHz gyrotron amplifier
A design is presented of a 250 GHz, 1 kW gyrotron traveling wave tube (gyro-TWT) amplifier with gain exceeding 50 dB. Calculations show that the amplifier will operate at 32 kV, 1 A with a saturated gain of 60 dB, an output power of 1 kW and a gain bandwidth of 3 GHz. The amplifier uses a novel …
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A 60 Ghz Mmic 4x Subharmonic Mixer
… resonance occurs in the atmosphere (~58-62 GHz) has received recent attention as a possible candidate for secure high-speed wireless data networks with a potentially high degree of frequency reuse. A significant challenge in implementing data networks at 60 GHz is the manufacture of low-cost …
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An 8 GHz Ultra Wideband Transceiver Testbed
… components. The receiver uses eight 1 GHz ADCs to perform time interleaved sampling at an aggregate rate of 8 Gsamples/s. The high sampling rates present extraordinary demands on the down-conversion resources. Samples are captured by the high-speed ADC and processed using a Xilinx …
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Entwurf von 24 GHz Schaltungen mit optimierter Verlustleistungsaufnahme
… sind Batterien, Kommunikationshardware bei 24 GHz und die entsprechende Antenne. Das erste Konzept basiert auf einem Direktempfänger, der mit einem Stromverbrauch von 23 mA (3 V) Sensordaten wie zum Beispiel Temperatur und Luftfeuchtigkeit überträgt. Für den Sendefall beträgt der Stromverbrauch …
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Frequency dividers design for multi-GHz PLL systems
In this work, a programmable frequency divider suitable for millimeter wave phase-lock loops is presented. The frequency divider has been implemented in a 90 nm standard CMOS technology. To the extent of maximizing the operative input frequency, the higher frequency digital blocks of the frequency …
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Exploring the faint source population at 15.7 GHz
… area of the Tenth Cambridge (10C) survey at 15.7 GHz in the Lockman Hole. The 10C survey is complete to 0.5 mJy at 15.7 GHz and has a resolution of 30 arcsec. By matching this catalogue to several lower frequency surveys (e.g. including a deep GMRT survey at 610 MHz, a WSRT survey at 1.4 GHz, …
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280 GHz receivers for the SPIDER CMB polarimeter
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2024-03-01 without embargo terms
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A BiCMOS RF mixer for 5-GHz receivers
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.
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Investigation of Ultra-Low Power CMOS GHz Circulator
Quantum computing is a future solution for unprecedented computation power to solve today’s challenges, such as simulating molecules and forecasting natural disasters more accurately. A practical quantum computing system needs thousands or even millions of qubits. However, the quantum computing …
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A 250 GHz photonic band gap gyrotron amplifier
… traveling-wave-tube (TWT) amplifier at 250 GHz. The gyrotron amplifier designed and tested in this thesis has achieved a peak small signal gain of 38 dB at 247.7 GHz, with a 32 kV, 0.35 A electron beam and a 8.9 T magnetic field. The instantaneous -3 dB bandwidth of the amplifier at peak …
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Design of a Highly Linear 24-GHz LNA
… attract many RF IC designers to work on 24-GHz transceiver design. The Federal Communication Commission (FCC) also dedicates the unlicensed 24-GHz band for industrial, science, and medical applications to overcome the interference in overcrowded communications and have higher output signal …
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