Antenna Theory and Communication Systems

1.

  a.

Use the input impedance  equation of a transmission line terminated with an arbitrary load (, to prove that, when the line length is , there is no transformation of the load impedance, i.e. .

b.

A lossless transmission line is terminated with impedance whose value that is ½ the characteristic impedance on the line. What impedance should you put in parallel with the line λ/4 in front of the load to minimize the reflection of the wave from the signal generator?  

c.

The diameter of a loop Antenna is 1.5λ, Calculate Radiation resistance and Directivity  

2.

a.

Two directional antennas are aligned facing each other in the bore sight direction at 1800 MHz in free-space conditions, as shown in Figure 2. Antenna A is a parabolic dish with 65% radiation efficiency, and antenna B is a horn antenna. The distance between antenna A and Antenna B is 10 meters. It is found that antenna B lies at the beginning of in the near field region with respect to antenna A. Calculate