The effects of different combinations of antenna patterns and polarizations on path loss and RMS delay spread in indoor obstructed channels at 2.45 GHz are treated. Based on measurement results, and assuming the main beams of the antennas are lined up on boresight, it appears that using vertically polarized (VP) antennas at both the transmitter and the receiver can provide smaller delay spread and smaller path loss compared to those of other antenna combinations. The correlation between path loss and RMS delay spread of different antenna combinations is presented. It is found that path loss is uncorrelated with RMS delay spread when the antennas are omnidirectional. However, strong correlations are found when the antennas are directional and both polarizations of the transmitter and receiver are vertically polarized (VP) or horizontally polarized (HP).
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