In order to solve the problem of multi-Gbps transmission in 60 GHz band - communication interruption by human body crossing, this paper proposes a method to increase reflected waves by installing artificial reflector(s) in two-dimensional arrangement and shows a good improvement of disconnection probability reduction to 1/4 (by one artificial reflector) and to 1/16 (by two reflectors). The interruption by human crossing is modeled and locations of transmitters and receivers are set on any grid of sub-partitioned rooms by grid (room sizes are defined by IEEE 802.11ad) to get statistically meaningful data. The computer simulations have been carried out with various TX and RX antenna HPBWs (Half Power Beam Width), several receiver sensitivities corresponding to 3Gbps to 0.5Gbps transmissions and by assuming a fixed TX antenna direction and a beam-forming receiver antenna that can track the incoming reflected wave(s) in case of LOS (Line of sight) path interruption. The simulation results show that disconnection probability reduction from about 80% to 20-10% by setting an artificial reflector to generate an additional reflected path and a reduction to 5% by setting two artificial reflectors when the TX and RX antennas' HPBWs are 30degree and the receiver sensitivity is -55.0dBm. The improvements by the proposed method are generally applicable to similar indoor communications environments.