2. (Simple link budget calculation) Consider a pair of transmit and receive antennas with gains Stand R Use the Friis free-space equation that we discussed in class to show that the received power in dBW can be expressed as [PRx(d)]dBw =[PTx]dow - A log10d - Blog10f+CdB, where A, B, and Care constants to be determined, f is the carrier frequency in Hz, and d is the distance between the transmit and receive antennas in meters. Give the values for A and B explicitly. Express Cin terms of grand gr. For an isotropic antenna, the gain is 1. As a result, we often employ the unit dBi for 10 log10 gt(or 10 log 10 gr) to express the gain of an antenna relative to that of an isotropic antenna. 2. (Simple link budget calculation) Consider a pair of transmit and receive antennas with gains Stand R Use the Friis free-space equation that we discussed in class to show that the received power in dBW can be expressed as [PRx(d)]dBw =[PTx]dow - A log10d - Blog10f+CdB, where A, B, and Care constants to be determined, f is the carrier frequency in Hz, and d is the distance between the transmit and receive antennas in meters. Give the values for A and B explicitly. Express Cin terms of grand gr. For an isotropic antenna, the gain is 1. As a result, we often employ the unit dBi for 10 log10 gt(or 10 log 10 gr) to express the gain of an antenna relative to that of an isotropic antenna