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 48 for “"5 GHz"”.
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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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Design and analysis of a frequency reconfigurable antenna for wireless communication at 5 GHz
… diodes, the antenna was shown to operate at 5.55 GHz, 5.327 GHz, 5.29 GHz, 5.25 GHz. and 5.23GHz resonant frequencies. The radiation patterns for all the simulated modes were nearly similar, thus implying that the designed antenna can be used for directional communication applications. The antenna …
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A dual-mode Q-enhanced RF front-end filter for 5 GHz WLAN and UWB with NB interference rejection
The 5 GHz Wireless LAN (802.11a) is a popular standard for wireless indoor communications providing moderate range and speed. Combined with the emerging ultra Wideband standard (UWB) for short range and high speed communications, the two standards promise to fulfil all areas of wireless application …
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Receiver equalization for a 10 gigabit per second high-speed serial link in 65 nm CMOS technology
… consuming 3.3 mW at the Nyquist frequency of 5 GHz.
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Paving the Path of LTE Toward 5G: Physical Layer Assurance and Operation in the Unlicensed Spectrum
… their data traffic by accessing the unlicensed 5 GHz frequency band. There are three variants of LTE-Unlicensed that have been proposed in the industry. These variants differ in their operational features, but they enhance the capacity of LTE and represent a big milestone in its evolution toward …
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Wireless networks for the developing world
… or "unlicensed" bands, include 2.4 GHz and 5 GHz in the USA and much of Europe. I argue that this unlicensed spectrum, and low-cost wireless technologies that operate in these bands, is of particular value in the developing world, where it has the potential to substantially impact …
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LİSANSSIZ KABLOSUZ SİSTEMLERİN NEDEN OLDUĞU GİRİŞİMİN BENZETİMİ
Bu çalışmada, 5 GHz bandını radarlarla paylaşımlı olarak kullanımı önerilen lisanssız telsiz erişim sistemlerinin (TES) ve bu bandın birincil kullanıcıları olan radarların genel özellikleri ile 5 GHz’te çalışan TES standartları tanıtılmıştır. Bu bantta çalışan TES’ lerin radarlar üzerinde bir …
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Coexistence of Vehicular Communication Technologies and Wi-Fi in the 5 and 6 GHz bands
… This has been true ever since the 2.4 GHz band and parts of the 5 GHz bands were first opened for unlicensed access worldwide. In recent years, the 5 GHz unlicensed bands have been one of the most coveted for launching new wireless services and applications due to their relatively …
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Design, fabrication, and characterization of a wideband microwave balun
… time domain and frequency domain, indicating a 5 GHz bandwidth. The time domain modeling technique is used to characterize the balun's performance. Based on physical analysis of the balun's configuration, the discontinuities through the transmission paths are modeled as distributed and lumped …
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Adattovábbító eszközök sugárzásának élettani hatásai
… A kísérletek során könnyen látható a 2,4 GHz-es illetve az 5 GHz-es tartomány káros hatásai. A növénykísérletekből, és mérési eredményekből láthatjuk, mekkora dózist bocsát ki egy ipari LTE antenna, mekkora térerőt generál maga körül, illetve látható, ahogy a router sugarában mi történik …
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Optical variability of radio-luminous palomar-green quasars
… with the highest radio core luminosity at 5 GHz in the Palomar Bright Quasar Survey were selected for this monitoring program; Seven out of the ten radio-luminous quasars exhibited signs of short-term variability, and all ten radio-luminous quasars showed signs of long-term variability. We …
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A piezo-tunable gigahertz cavity microelectromechanical resonator
… and its wide high-frequency tuning range of 2.5 GHz to 4.0 GHz, which have been experimentally demonstrated. The resonator is fabricated using standard MEMS technologies and consists of a gold-lined capacitor and toroidal inductor cavity formed by etching silicon in potassium hydroxide. Frequency …
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Surface-emitting distributed feedback terahertz quantum-cascade phase-locked laser arrays
… index change. A frequency tuning range of 1:5 GHz out of 3:9 THz was measured. Moreover, an electronically controlled "beam steering" device is also proposed based on the result of this work. This thesis focuses on the design, fabrication and measurement of the surface-emitting distributed …
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Use of GIS in Radio Frequency and Positioning Applications
… in GIS for frequencies ranging from 500 MHz to 5 GHz. The Medium Scale RF Model incorporates GIS building data to model WiFi systems at 2.4 GHz for a range of up to 300m. Both Models can be used by city planners and government offcials, who commonly use GIS for other geospatial and geostatistical …
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Analysis and design of reconfigurable multi-band stacked microstrip patch antennas (MSAs) for wireless applications
… of operating frequencies in the range of (2-5) GHz. The first new antenna is composed of two layers. The bottom layer is a MSA with two slots designed on each side that can be controlled via switches. By adjusting the statuses of the switches (that optimally fixed along the slots) we can vary …
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Ring oscillator based injection locked clock multiplier
… 340 fsrms integrated jitter when operating at 5 GHz while only consuming 5.3 mW of power. The ILCM's figure of merit, -242.4 dB, is on par with state-of-the-art ring-based clock multipliers while operating at a much higher output frequency and multiplication factor than previously published work. …
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Determination of Bragg Scatter in an Aircraft Generated Wake Vortex System for Radar Detection
… ranging from VHF to C band (100 MHz to 5 GHz). The mechanism that yields this radar cross section is Bragg scattering from the index of refraction variations due to the atmospheric water vapor and potential temperature fields being mixed by the wake vortex system. Refractive index …
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Digital ADCs and ultra-wideband RF circuits for energy constrained wireless applications by Denis Clarke Daly.
… in 90 nm CMOS and operating in the 3-to-5 GHz band. The all-digital transmitter employs capacitive combining and pulse shaping in the power amplifier to meet the FCC spectral mask without any off-chip filters. The noncoherent receiver system-on-chip achieves both energy efficiency and high …
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A Study of Electromagnetic Scattering of Communication Signals by Randomly Rough Surfaces
… scenarios utilizing frequencies in the 1-GHz and 5-GHz bands against a series of signal bandwidths and surface roughnesses. The results are analyzed singularly for Extended-MOMI and against Extended-Physical Optics to better understand the benefits associated with using the Extended-MOMI, …
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Design of a Microwave Imaging System for Target Identification
… use the common Wi-Fi frequencies of 2.4 GHz and 5 GHz because of the wide availability of commercial microwave components that operate at these frequencies. For the image reconstructions of the targets, we used two separate inverse scattering algorithms. The first algorithm employed is …
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