The allocation of the 700 MHz band to mobile communications will further reduce the spectrum available to wireless microphones. New frequency bands will have to be found to accommodate these applications. The human body plays a very important role in wireless microphone transmission and must be taken into account.
A study which examines the effect of the human body on the propagation loss of wireless microphones as a function of the frequency, the type of microphone and the size of the human body has been carried out by the IT'IS (Information Technology In Society) foundation of the ETHZ and financed by OFCOM.
The study was performed using digital simulations with realistic models of human bodies. The wireless microphones are either held in the hand or worn close to the head with a connecting cable to the transmitter, the latter being attached to the belt at waist height. The radiation diagrams and specific absorption rates (SAR) were simulated for a wide range of frequencies from the VHF band to the SHF band. This study is of great importance for evaluating the suitability of the higher frequency bands for wireless microphone systems.
Last modification 30.11.2015