Question

1. Determine the electric length of a 5cm long Wifi 2.4 GHz antenna, in degrees.

2. VSWR of a system defined as Z_L = (1+j2) Z₀

3. Find the input impedance of a 50 Ohm quarter wavelength long TL is terminated with a load of 100 Ohms.

Answer 1

» 20 0 Sleef 2 a= c/f = 3x10 x 10² cm Qlochic length Electric length = [Pl = 2y x se= longth] f = c/ 2.48109 2 = 12.5cm Substitute (I in A electrical length= 20 x 5 cm Be = 2.51 rad J in degrees R$ = 2.51 x 180º = 144° B = 180° Bl = 1440 . 2) VSWR Reflection co-oficient ML = 24-20 = (1+2)20-20 2lt20 (1+2) 20+20 3 1 +j27 = )2 = j 1+j2+1 2+2j iti ML = (1-) = iti TMV = V2 tan (y) = y 245° VS YMR = Itre VSWR = 1 + 1) = 1+ y2 1.707 1-Ire VSWR = 5.828 1-% 0.292

3) given e=My 20 - 50 2 = 100 when lean input impedance forom wla is Zijp = 20%. = 50x50 100 zipp = 250]