Question

7) Two half-wave dipole antennas, each with an impedance of 75 Ω, are connected in parallel through a pair of 0.5-A transmission lines, and the combination is connected to a feed 0.25-2 transmission line, as shown in the Figure. 75Ω (Antenna) (a) What is the impedance of the 0.25-2 feed transmission line such that Zin will be matched to a 5042 TL? (b) If the result of (a) is connected to a 50 Ω TL that is, in turn, connected to a generator with Vg-5 cos(et) V and z, = 50 Ω how much power it delivered to each antenna (c) why is the result in (b) independent ofthe length of the 5042 TL? 7552 (Antenna

Answer 1

iven そ1 2 input ps 又见" s ) 굿。는.(ga,)@r) 2-Jer) 知 . A 3-301 阮)ヲ )

4 3.2 Tole pe case Son To we get anne Voltage upto 'st5,Lane

41A Cine Voltage o Vy 2 4-1了 A33 니 A

C) Here 50ohm line has load of 50ohms which gives input impedence of 50ohms independent on length of line

So, power delivered to load is independent on 50ohm line.

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