Improving indoor signal coverage by use of through-wall passive repeaters

Wide band passive repeaters: Design and measurements

“…Contrarily to its active counterpart this repeater does not require neither active power supply, nor signal processing circuitry. It does not generate undesirable interference generated by oscillators [1,2] either. In this communication the performances of a passive repeater including two broadband antennas and a coaxial line is analyzed using both full-wave electromagnetic simulations and measurement data.…”

Radio propagation in frequency selective buildings

“…These include active and passive repeaters, distributed antennas, leaky feeders etc. The details of these can be found in References [5,6]. Each method has its own advantages and disadvantages.…”

Dual-Polarized Through-Wall Repeater for the Wireless Reading of Millimeter-Wave Passive Sensors

“…For such closed and confined environments, passive repeaters could be used for transmitting the mm-wave EM field through the wall of cavities and interrogate sensors. Such well-known repeaters have been applied to improve the indoor coverage of wireless networks [4], ensure through-wall digital communications [5], or else, enhance the Tx-to-Rx antenna isolation [6]. Up to now, through-wall repeaters are mono-polarized, that is, the polarization of the transmitted electric field is identical when crossing the wall from one side to the other side of the wall, regardless of transmission direction.…”