Investigation of using passive repeaters for indoor radio coverage improvement

Video Streaming over 802.11b in the Presence of Fading Due to Human Traffic and Bluetooth Interference

“…Improving the environment so as to mitigate Bluetooth interference and human shadowing effects. For example, readjusting the antennas on the raised ceilings and avoiding points above raised ceilings that may start emitting spurious radiation, or relocating large metallic objects obstructing the radio propagation path if possible, or using passive repeaters described by Huang et al [38] on walls for improving radio coverage over particular locations like Head Rest or open spaces such as a library.…”

Passive Reception of Digital TV Signals with an Antenna

“…If the installation of a cable from the external antenna to the receiver device or a large antenna is not desired due to aesthetic reasons, the installation of a passive signal repeater on the external wall would be sufficient. The main function of the passive repeater in this case is to redirect the distribution of the field in the indoor environment improving coverage in certain areas while the total energy within the environment does not change [3]. This topic shows in which conditions this option is feasible.…”

“…Yagi-Udo antennae were used for the repetition location, with a minimum gain of 12 dB [3] across the UHF band for both reception and retransmission. The interconnection cable between the two antennae is an RG6 with attenuation of 1 dB.…”

“…In this case, it is desirable to develop a lowcost solution for both the installation and maintenance, that is unlikely to be stolen or vandalized. Depending on the signal level at the location, a passive repeater can be installed, this only uses antennae installed in a back-to-back configuration without the use of an amplifier [3]. It is a low-cost solution that solves the problem, in some cases.…”

Frequency Selective Buildings Through Frequency Selective Surfaces

“…The technique investigated in this paper is to utilise Frequency Selective Surfaces (FSS) as isolators or even as passive repeaters, in indoor environments [12]. The passive repeater concept is based on the assumption that the mean signal strength received due to a reflected contribution from a FSS would be higher from the one received from any other object/material that does not produce a strong reflection [13], [14], [15], [16]. Alternatively, FSS can be used to provide radio isolation by selectively rejecting a frequency range, thus reducing interference between adjacent co-channel wireless systems.…”