Essays about: "directivity"

Showing result 11 - 15 of 44 essays containing the word directivity.

1. 11. Geodesic Lens Antenna for sub-THz Imaging

   University essay from KTH/Skolan för elektroteknik och datavetenskap (EECS)

   Author : Joan Mitjans i Blasco; [2021]
   Keywords : ;

   Abstract : The Millimiter Wave (mmW) frequency band, characterized by a high atmospheric attenuation and wide available bandwidth has become of big interest for high accuracy radar imaging applications. The continuous development of the Monolithic Microwave Integrated Circuit (MMIC) technology yields to the appearance of different commercial-off-the-shelf (COTS) radar transceivers at that frequency band, where the antennas are fully integrated into the chip. READ MORE

3. 12. Acoustic Prediction Methods for Rocket Flame Deflector Design

   University essay from KTH/Skolan för industriell teknik och management (ITM)

   Author : FREDRIK RANOW; [2021]
   Keywords : Flame deflector; Launch pad; Estimation methods; Acoustics; Reflectivity; Diffraction; Directivity; Flamdeflektor; Uppskjutningsplattform; Uppskattningsmetoder; Akustik; Reflektivitet; Diffraktion; Direktivitet;

   Abstract : The aim of the project behind this report is to gain an understanding for the design criteria of launch pad flame deflectors used for launching rockets. This report presents an overview of the underlying phenomena, and then tackles the issue of estimating noise levels that come about during lift-off. READ MORE

4. 13. Design of 5G antenna arrays based on Multi-directivity

   University essay from Linnéuniversitetet/Institutionen för fysik och elektroteknik (IFE)

   Author : Zhiwei Wang; Shen Zhang; [2020]
   Keywords : 5G; antenna array; microstrip; feed network;

   Abstract : As communication technology evolves, the focus shifts to 5G. The discussion of 5G cannot be separated from a discussion of related antenna systems. Chapter 1 is a brief introduction to our work, which is an antenna array for a 5G communication system operating in the band 3.4 to 3. READ MORE

5. 14. Development and tests of SONAR array for underwater communication

   University essay from KTH/Marina system

   Author : Marcus Hellman; [2020]
   Keywords : ;

   Abstract : Water covers about 70 % of Earth’s surface. Most of the water is located in the ocean’s, which have an average depth of almost 3700 meters. This implies that there is a multitude of phenomena to investigate and discover. But due to human limitations other methods and tools need to be considered in order to investigate the depths. READ MORE

6. 15. Underwater probe for deep sea exploration : Long range acoustic underwater communication system

   University essay from Luleå tekniska universitet/Institutionen för system- och rymdteknik

   Author : Kim Nykvist; [2020]
   Keywords : Acoustic communication; temperature; Expendable Bathythermograph; XBT;

   Abstract : This was a thesis that was commissioned by Researcher Peter Sigray at the Royal Institute of Technology (KTH) in Stockholm and was based on an idea by Professor Thomas Rossby, University of Rhode Island (URI). The idea was to further develop the existing Expendable Bathythermograph (XBT), which has been in use since the 1960s. READ MORE