Institutionsnamn: Institutionen för rymd- och geovetenskap, Avancerad mottagarutveckling

Hittade 4 dokument

1. Wideband directional couplers and power splitters
   Tutkur, Elmin
   Examensarbete på avancerad nivå, 2014 (MSc - Nanotechnology)
   Microwave quadrature couplers and out-of-phase power combiners/dividers are in many aspects crucial devices and are used in many microwave subsystems, such as mixers,modulators, antenna beam forming networks and antenna array feeds to name a few. In modern microwave circuits there is an increasing demand for wideband operationand lower costs (no complex stru...
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2. NbN ultra-thin films for HEB-based THz systems
   Krause, Sascha
   Examensarbete på avancerad nivå, 2013 (Masterarbete)
   The key technology for low-noise THz receivers operating above 1 THz, lies inevitably in the employment niobium nitride superconductors with critical bulk temperature of 16-17K. The enhancement of HEB’s limited IF bandwidth has been a relevant topic for two decades and is associated with the quality, hence critical temperature, Tc, of the 3.5-6nm thin NbN fi...
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3. Design of a 4-bit phase shifter using PIN diodes and high-pass/low-pass topology at 2.45 GHz
   Qureshi, Muhammad Tayyab
   Examensarbete på avancerad nivå, 2012 (Masterarbete)
   Phase shifters are used phased array antennas for beam steering applications. In this thesis work, a 4-bit digital phase shifter was designed using NXP PIN diode switches and high-pass/low-pass Π filter topology at 2.45 GHz. The phase shifter was designed using momentum simulation on Agilent ADS from Murata and NXP design kits. The Single Pole Double Throw (...
4. Design of a beam switch for the mm-wave receiver at Onsala Space Observatory
   Olsson, Christian
   Examensarbete på grundnivå, 2011 (Högskoleingenjör)
   Ground-based astronomical observations at millimetre wavelengths are very challenging due to the strong influence of the rapidly fluctuating water content in the Earth's atmosphere. Calibration to compensate for atmospheric disturbances and also to the receiver’s limited stability is done by switching rapidly between the source under observation and cold spa...
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