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 16 of 16 for “"V-band"”.
-
Time Diversity Modelling and Implementation for Broadcast Satellite Systems at V-band
… satellite networks at higher frequency bands such as the Ka and V-band has become essential to meet an increasing demand for high data rate multimedia services. Satellite systems operating at high frequency bands offer large bandwidth and are able to provide better quality of service for …
-
V-band low noise amplifier and mixer design using 90 nm CMOS technology
… on the design of the receiver part of a V-band high data-rate millimetre-wave transceiver and particularly on two important building blocks such as lownoise amplifier and down-conversion mixer. At first, the specifications of the receiver and its sub-blocks have been extracted applying to …
-
Validation of the ITU-R P series radio wave propagation model for millimetre wave V-Band (60GHz) line-of-sight point-to-point short distance link
Millimetre-wave communication systems have a very high potential to become mobile technology of choice for future 4G and 5G network architectures, which has led to many researchers carrying out studies regarding the effects of the atmosphere on radio propagation. There is growing interest in the …
-
Viability of High Availability Kband Satellite Communication using Hybrid Fade Mitigation
The C and Ku bands that have been the backbone of satellite telephony and data networks in the past are limited in the amount of bandwidth they provide. Consequently, some broadband Internet services have started to move into the Ka band in order to utilise the bandwidth at these higher …
-
Development of Direct Ion -Implanted Gallium Arsenide MESFET and Low-Actuation-Voltage RF MEM Switches
… justify the readiness of this technology in Ka-band and V-band applications. The low operation-voltage switches will facilitate the direct integration with current MMICs and provide a solution to broadband reconfigurable circuits. The mature GaAs MESFET technology integrated with RF MEM switches …
-
Galaxy Evolution in the last 9 Billion Years
… der Helligkeit von ca. 1 mag arcsec^-2 im V -Band seit z~1. Nur schwache oder keine Entwicklung der Masse-Größe-Beziehung von Galaxien mit log(M/M_sun)>~10 ist sichtbar im gleichen Zeitraum, konsistent mit einem mittleren Wachstum der Scheiben von Innen nach Außen. Scheiben werden umso größer, …
-
Searching for Interacting Early Type Galaxies at Late Cosmic Times
… for residual asymmetric features in SDSS r-band images provided a lower limit to the frequency of massive pairs with interaction signatures residing in groups and clusters with halo masses M[subscript halo] ≥ 2.5 x 10¹³ M[subscript ☉]. The tidal sgnatures of such interactions may often be …
-
Exploring star formation in dwarf galaxies at Z1
… that using SED-fitted dust estimates, in the V-band, underestimates the extinction in high mass galaxies, in agreement with a recent result obtained by Price et al. (2013). We instead derive an empirical mass-dependent dust correction to take into account the extra extinction needed in high mass …
-
A Novel Variable Inductor-Based VCO Design with 17% Frequency Tuning Range for IEEE 802.11AD Applications
… 8 GHz TR centered on 60 GHz. This wide TR at V band imposes significant challenge to the VCO design in radio transceivers, and makes the TR of the integrated VCO a major bottleneck to the successful commercialization of many IEEE 802.11ad compliant radio systems today. As an effort to solve the …
-
A Study of the Effects of Scintillation on Digital Satellite Communication Systems
… the satellite industry to search for higher bandwidth and improved cost of services. Higher frequency bands, such as Ka and V-band, came into play. These frequency bands have the advantage of efficient use of spectrum, the ability to transfer data at much higher rates, and the use of smaller …
-
A multi-frequency study of symbiotic stars
… and ultraviolet line ratios and the recent V-band light curve in terms of the gradual obscuration of the outbursting primary component by the large, dusty envelope of the late-type secondary. Light curves have been used to estimate both the distance to the system and the physical extent of the …
-
Beam-Steerable and Reconfigurable Reflectarray Antennas for High Gain Space Applications
… Detailed analysis is performed for Ka-band reflectarray unit cells and verified by full-wave simulations. In addition, an approach to extract the Q factors using full-wave simulations is also presented. Lastly, a detailed study on the effects of inter-element spacing is discussed. Q …
-
LUMINOSITY DISTRIBUTIONS AND ABUNDANCE TOMOGRAPHY MODELLING OF TYPE IA SUPERNOVAE
… a large sample analysis of their B and V - band light curves, separated by host galaxy type. A new method for calculating host galaxy extinction is implemented and the width luminosity relation (WLR) is examined. After correction for host galaxy extinction, ‘normal’ SNe Ia (∆m15(B) < 1.6 …
-
Multiwavelength studies of classical novae
… absolute maximum magnitude of ∼ −10.5 in the V -band. Chapter four is a multiwavelength study of nova V407 Lup. With a light-curve decline time t2 ≤ 2.9 d, this is one of the fastest known examples and the white dwarf is possibly more massive than 1.25 M. Our set of optical, UV, and X-ray data …
-
A 60 Ghz Mmic 4x Subharmonic Mixer
In this modern age of information, the demands on data transmission networks for greater capacity, and mobile accessibility are increasing drastically. The increasing demand for mobile access is evidenced by the proliferation of wireless systems such as mobile phone networks and wireless local area …
-
The role of binary stars in searches for extrasolar planets by microlensing and astrometry
… at different sites, in I, R and V photometric bands. Tests on simulated microlensing light curves show that BISCO is successful in finding the solution to a binary-source event in a very wide parameter space. Flux ratio method is suggested in this work for breaking degeneracy between …