mmwave – RAYmaps

December 22, 2021December 9, 20245G, 6G

5G Millimeter Waves: Are They Really Harmful

There has been a continuous debate about harmful effects of Electromagnetic Radiations ever since they came into existence. Most of the research results suggest that there are no harmful effects, if the rules and regulations are followed. But there is a small body of research that suggests that there might be some harmful effects and more research needs to be carried out. This is particularly important now as 5G Wireless Technology is being rolled out around the world and it uses millimeter waves for which we have limited data.

March 10, 2019June 4, 20225G, Fundamentals

60 GHz Millimeter Wave Band – Seems Like a Free Lunch

60GHz Millimeter Wave Band is a band spread between 57GHz and 64GHz. This unlicensed band was first released in the US in 2001 but with limited allowance for transmit power (EIRP of 40dBm). Later on, in 2013, this limit was increased (EIRP of 82dBm) to allow for greater transmit power and larger range.

January 5, 2019June 4, 20225G, Fundamentals

Path Loss at Millimeter Wave Frequencies

The mmWave Channel It is well known that wireless signals at millimeter wave frequencies (mmWave) suffer from high path loss, which limits their range. In particular there are higher diffraction and penetration losses which makes reflected and scattered signals to be all the more important. Typical penetration losses for building materials vary from a few dBs to more than 40 dBs [1]. There is also absorption by the atmosphere which increases with frequency. But there are also some favorable bands where atmospheric losses are low (<1dB/km).

December 26, 2018June 4, 20225G, Fundamentals

Multicarrier Beamforming at mmWave

Discussion of Multicarrier Beamforming particularly in the context of Massive MIMO and Millimeterwave