Two half-wave dipole antennas, each with an impedance of 75 Ω, are connected in parallel t...

Two half-wave dipole antennas, each with an impedance of 75 Ω, are connected in parallel through a pair of transmission lines, and the combination is connected to a feed transmission line, as shown in Fig.

Figure

All lines are 50 Ω and lossless.

(a) Calculate Zin1, the input impedance of the autenna-terminated line, at the parallel juncture.

(b) Combine Zin1, and Zin2 in parallel to obtain Z'L, the effective load impedance of the feedline.

(c) Calculate Zin of the feedline.