4 years ago

New Standards for Wireless LANs

New Standards for Wireless LANs

twisted pair 1000 km 300

twisted pair 1000 km 300 Hz Frequencies for Communication 10 km 30 kHz coax cable 100 m 3 MHz VLF LF MF HF VHF UHF SHF EHF infrared visible light UV VLF = Very Low Frequency UHF = Ultra High Frequency LF = Low Frequency SHF = Super High Frequency MF = Medium Frequency EHF = Extra High Frequency HF = High Frequency UV = Ultraviolet Light VHF = Very High Frequency Frequency and wave length: λ = c /f 1 m 300 MHz With wave length λ, speed of light c ≈ 310 8 m/s, frequency f - 24 - 10 mm 30 GHz 100 μm 3 THz optical transmission 1 μm 300 THz TZI – FB 1 – Kommunikationsnetze Andreas Könsgen – Summer Term 2011

Frequencies for Mobile Communication • VHF-/UHF-ranges for mobile radio – simple, small antenna for cars – deterministic propagation characteristics, reliable connections • SHF and higher for directed radio links, satellite communication – small antenna, focusing – large bandwidth available • Wireless LANs use frequencies in UHF to SHF spectrum – some systems planned up to EHF – limitations due to absorption by water and oxygen molecules (resonance frequencies) • weather dependent fading, signal loss caused by heavy rainfall etc. - 25 - TZI – FB 1 – Kommunikationsnetze Andreas Könsgen – Summer Term 2011

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