1. Consider a source driving the antenna model in the circuit below. The source has a voltage of 100Vrms and an impedance of RS 50 ohs. The antenna has an impedance of Z RRadRLoss+jX where the radiat...
1. Consider a source driving the antenna model in the circuit below. The source has a voltage of 100Vrms and an impedance of RS 50 ohs. The antenna has an impedance of Z RRadRLoss+jX where the radiation resistance RRad-3 ohms, the loss resistance RLoss-12 ohms, and the reactance jXj150 ohms. (a) What is the efficiency of the antenna? (This miserable efficiency is actually better than many electrically-small antennas.) (b) How much power is being radiated? (c) How much power would be radiated if we added a series inductor with a reactance of +j150 ohms? d) How much power would be radiated if we kept the series inductor but also added a lossless matching section that matches 15 ohms to 50 ohms? (You do not need to actually design the matching section. Just assume that such a lossless matching section exists.) e) How many decibels of improvement is there from part lb to part ld? RS RLosS RRad
1. Consider a source driving the antenna model in the circuit below. The source has a voltage of 100Vrms and an impedance of RS 50 ohs. The antenna has an impedance of Z RRadRLoss+jX where the radiation resistance RRad-3 ohms, the loss resistance RLoss-12 ohms, and the reactance jXj150 ohms. (a) What is the efficiency of the antenna? (This miserable efficiency is actually better than many electrically-small antennas.) (b) How much power is being radiated? (c) How much power would be radiated if we added a series inductor with a reactance of +j150 ohms? d) How much power would be radiated if we kept the series inductor but also added a lossless matching section that matches 15 ohms to 50 ohms? (You do not need to actually design the matching section. Just assume that such a lossless matching section exists.) e) How many decibels of improvement is there from part lb to part ld? RS RLosS RRad