Problem

A cell phone antenna picks up a call. If the antenna and cell phone are modeled as shown i...

A cell phone antenna picks up a call. If the antenna and cell phone are modeled as shown in Fig. P5.129,

(a) Find Rcell for maximum output power.
(b) Determine the value of Pout.
(c) Determine the corresponding value of Pant.
(d) Find Vo/Vant.
(e) Determine the amount of power lost in Rant.
(f) Calculate the efficiency η = Pout/Pant.
(g) Determine the value of Rcell such that the efficiency is 90%.
(h) Given the change in (g), what is the new value of Pant?
(i) Given the change in (g), what is the new value of Pout?
(j) Comment on the results obtained in (i) and (b).