Measurement of polarization diversity gain for on-body to off-body channel in ISM band

This paper investigates polarization diversity for on-body to off-body fading mitigation. To implement this diversity، first، a dual linearly polarized on-body antenna is designed and fabricated in licence free industrial، scientific and medical (ISM) band (2. 4-2. 4835 GHz). Using this antenna as a receiver at three different points of body: wrist، heart and belt and a fixed off-body transmitter antenna in indoor environment، time variations of received signals of two diversity ports is recorded using two different spectrum analyzer. In the second step، three methods of signal combination (selection، equal gain and maximum ratio) is applied to calculate the diversity gain. The results show that maximum and minimum of diversity gain is 6. 35 and 4. 7dB، respectively.