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3.1.1自由空间传播损耗 我们知道,电磁波在自由空间传播时,传播的距离越远,能量分布的空间就越广,因而能量密度越小。同时,电波传播也会因受到自由空间障碍物的吸收和反射而衰减,因此我们定义传播损耗L_p为:当收发空间相距为d,且都采用无方向性天线时,发射功率P_T与接收功率P_R的比值:
3.1.1 Propagation loss in free space We know that the electromagnetic wave propagating in free space, the farther the distance of propagation, the wider the space of energy distribution, so the smaller the energy density. At the same time, the propagation of radio waves will also be attenuated due to the absorption and reflection of obstacles in free space. Therefore, we define the propagation loss L_p as: when the transmitting and receiving spaces are separated by d and all adopt the non-directional antenna, the transmitted power P_T and the received power P_R Ratio: