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Radio signal propagation in tunnels exhibits significant differences from outdoor or indoor multipath environments (radio signals reflected off walls, floors, or other objects). This research measures the propagation of UHF/SHF radio signals from 455 MHz up to 5.8 GHz in frequency bands commonly used for underground wireless communications and electronic tracking. The paper focuses on the experimental...
Windows were traditionally used as a means of building access and egress for RF signals. However, the drive towards building energy efficiency now means that windows are frequently coated with thin layers of Transparent Conductors (TCs). TCs can let visible light energy pass virtually un-attenuated, but reflect longer wavelengths (typically from the infrared region), to keep buildings warmer in colder...
Compact 2.4 GHz WiFi printed antennas based on a ldquotwistedrdquo slot approach have been designed and integrated on a board taking into account isolation requirements with an existing DECT module (1.9 GHz) for simultaneous WiFi and DECT operations. The obtained isolation between WiFi and DECT antennas of 30 dB has been ensured thanks to quarter wavelength slot stubs and a proper positioning of the...
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