Preliminary results of measurements of penetration losses through buildings at 2.5 GHz

A Low-Power CMOS Wireless Acoustic Sensing Platform for Remote Surveillance Applications

“…Assuming the antenna attenuation to be 6 dB and the obstacles along the transmission path, such as walls, trees, and so on, to contribute another 25 dB loss, the free space attenuation limitation is 83.7 dB for a sensing platform with a 5.7 dBm maximum output power. According to the propagation loss of radio waves in free space [29], the propagation loss (L f s ) can be written as…”

Spatial modulation schemes and modem architectures for millimeter wave radio systems

“…These losses lead to poorly reflective environment and thus, the short delay spread of wideband wireless channel is limited to a few taps [11]. At 28 GHz, the penetration loss due to a 3.8 cm thickness glass is 40 dB [12] while pane of glass at 2GHz leads to 13dB penetration loss [13]. A high thickness brick pillar leads to 28dB penetration loss at 28GHz [12] and 20 dB at 2.5 GHz [13].…”

“…At 28 GHz, the penetration loss due to a 3.8 cm thickness glass is 40 dB [12] while pane of glass at 2GHz leads to 13dB penetration loss [13]. A high thickness brick pillar leads to 28dB penetration loss at 28GHz [12] and 20 dB at 2.5 GHz [13]. As an illustrative example, Table 3.2 shows the path loss for LOS and NLOS scenarios at different frequencies and transmitter (TX)-receiver (RX) distances [9]- [14].…”