Search for dissertations about: "2.4 GHz"

Showing result 1 - 5 of 17 swedish dissertations containing the words 2.4 GHz.

2. 1. 60 GHz Mixer and Multifunctional MMICs in GaAs pHEMT and mHEMT technologies

   Author : Sten Gunnarsson; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Image reject mixer; Broadband wireless communication; Single-chip; Multifunctional; Mixer; Balanced resistive mixer; GaAs; Dual-quadrature mixer; 60 GHz; Receiver; pHEMT; MMIC; High data-rate; Double balanced Gilbert mixer; mHEMT; Transmitter; V-band;

   Abstract : In recent years, the 60 GHz band has gained increased academic and commercial interest mainly due to the relative large amount of license free and little used frequency spectrum located in vicinity of 60 GHz. The exact locations of these free frequency bands varies locally but the 5962 GHz band overlap around the world and is therefore a true world wide license free band. READ MORE

4. 2. Reliable RFID Communication and Positioning System for Industrial IoT

   Author : Chuanying Zhai; Hannu Tenhunen; Zhuo Zou; Jari Nurmi; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; 2.4-GHz UWB hybrid positioning; industrial IoT; MF-TDMA; QoS; reliable communication; RFID; Informations- och kommunikationsteknik; Information and Communication Technology;

   Abstract : The Internet of Things (IoT) has the vision to interconnect everything of the physical world and the virtual world. Advanced automated and adaptive connectivity of objects, systems, and services is expected to be achieved under the IoT context, especially in the industrial environment. Industry 4. READ MORE

5. 3. Millimeter-Wave Impulse Radio

   Author : Mats Ärlelid; Institutionen för elektro- och informationsteknik; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Compound semiconductor; resonant tunneling diode; ultra wideband; 60 GHz; on-off keying; transmitter; receiver; and super-regenerative oscillator;

   Abstract : This thesis investigates the opportunity of wireless multi-gigabit per second communication at the millimeter-wave (mmW) frequencies around 60 GHz by using impulse radio and nanoelectronics. Today most wireless communication take place in the microwave region, where several different systems and applications are crowding the narrow-band channels. READ MORE

6. 4. Micro- and Millimeter Wave CMOS Beamforming Receivers

   Author : Andreas Axholt; Institutionen för elektro- och informationsteknik; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; beamforming; CMOS; front-end; microwave; millimeter wave; phase-locked loop; phased-array;

   Abstract : The available bandwidth in wireless communication systems, such as the 802.11 family, is very limited. Together with the ever increasing data traffic, this causes problems. New possibilities are, however, available thanks to wide license-free bandwidth allocated at higher frequencies. READ MORE

7. 5. Microwave Frequency Stability and Spin Wave Mode Structure in Nano-Contact Spin Torque Oscillators

   Author : Anders Eklund; B. Gunnar Malm; Johan Åkerman; Mikael Östling; Erik Wahlström; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; spintronics; microwave oscillators; magnetization dynamics; spin waves; phase noise; device modelling; electrical characterization; X-ray microscopy; STXM; XMCD; Fysik; Physics; Electrical Engineering; Elektro- och systemteknik;

   Abstract : The nano-contact spin torque oscillator (NC-STO) is an emerging device for highly tunable microwave frequency generation in the range from 0.1 GHz to above 65 GHz with an on-chip footprint on the scale of a few μm. READ MORE