4.23. A center-fed electric dipole of length / is attached to a balanced lossless trans- mission line whose characteristic impedance is 50 ohms. Assuming the dipole is resonant at the given length, find the input VSWR when (a) 1 = 2/4 (b) 1 = 2/2 (c) 1 = 32/4 (d) 1 = 2