Sökning: "antenna arrays"

Visar resultat 16 - 20 av 81 avhandlingar innehållade orden antenna arrays.

1. 16. Mobile cellular communications with base station antenna arrays

   Författare :Per Zetterberg; KTH; []
   Nyckelord :;

   Sammanfattning : This thesis deals with the problem of increasing thespectrum efflciency of cellular systems by the use of antennaarray base stations. The focus of the thesis is on downlinktransmission in frequency division duplex systems. i.e. LÄS MER

3. 17. Integrated Antennas : Monolithic and Hybrid Approaches

   Författare :Erik Öjefors; Anders Rydberg; Sayan Mukherjee; Duixian Liu; Uppsala universitet; []
   Nyckelord :Electronics; antenna travelling wave arrays; antenna phased arrays; phase shifters; micromachining; silicon; monolithic microwave integrated circuits; dipole antennas; loop antennas; slot antennas; Elektronik;

   Sammanfattning : This thesis considers integration of antennas and active electronics manufactured on the same substrate. The main topic is on-chip antennas for commercial silicon processes, but hybrid integration using printed circuit board technology is also addressed. LÄS MER

4. 18. Ultra-wideband Antenna and Radio Front-end Systems

   Författare :Magnus Karlsson; Anders Rydberg; Linköpings universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Wireless communication; ultra-wideband; radio communication; UWB bandwidth; antenna parallelism; Electrical engineering; Elektroteknik;

   Sammanfattning : The number of wireless communication applications increase steadily, leading to the competition for currently allocated frequency bands. Pressure on authorities around the world to permit communications in higher and wider frequency ranges to achieve higher wireless capacity than those existed in the past has resulted in several new specifications. LÄS MER

5. 19. Detection principles for fast Rayleigh fading channels using an antenna array

   Författare :Anders Hansson; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; iterative decoding; serially concatenated coding; adaptive antenna arrays; multiple antennas; APP algorithm; diversity reception; Rayleigh channels; correlation; sequence detection; fading channels;

   Sammanfattning : .... LÄS MER

7. 20. Antenna Designs Aiming at the Next Generation of Wireless Communication

   Författare :Sadegh Mansouri Moghaddam; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Phased array antenna; MIMO efficiency; CDF; Millimeter-wave; PoD; OTA; Ultra-Wideband UWB antenna; Tightly-Coupled Dipole Array TCDA .; RIMP; Random-LoS; 5G;

   Sammanfattning : Millimeter-wave (mm-wave) frequencies have drawn large attention, specically for the fifth generation (5G) of wireless communication, due to their capability to provide high data-rates. However, design and characterization of the antenna system in wireless communication will face new challenges when we move up to higher frequency bands. LÄS MER