A small dipole of length 1 = 1/20 and of wire radius a = 1/400 is fed symmetrically, and it is used as a communications antenna at the lower end of the VHF band (f = 30 MHz). The antenna is made of perfect electric conductor (PEC). The input reactance of the dipole is given by Xin = -j120 [In(l/2a) - 1] tan n (6) Determine the following: (a) Input impedance of the antenna. State whether it is inductive or capacitive. (b) Radiation efficiency (in percent). (c) Capacitor (in farads) or inductor in henries) that must be connected in series with the dipole at the feed in order to resonate the element. Specify which element is used and its value. Problem 3 The radiation field of a particular antenna is given by: E = gjouk sin o 2A, e-jkr +you sin '042e-jkr 4x7 2x The values A, and A2 depend on the antenna geometry. Obtain an expression for the radiation resistance. What is the polarization of the antenna? A small dipole of length 1 = 1/20 and of wire radius a = 1/400 is fed symmetrically, and it is used as a communications antenna at the lower end of the VHF band (f = 30 MHz). The antenna is made of perfect electric conductor (PEC). The input reactance of the dipole is given by Xin = -j120 [In(l/2a) - 1] tan n (6) Determine the following: (a) Input impedance of the antenna. State whether it is inductive or capacitive. (b) Radiation efficiency (in percent). (c) Capacitor (in farads) or inductor in henries) that must be connected in series with the dipole at the feed in order to resonate the element. Specify which element is used and its value. Problem 3 The radiation field of a particular antenna is given by: E = gjouk sin o 2A, e-jkr +you sin '042e-jkr 4x7 2x The values A, and A2 depend on the antenna geometry. Obtain an expression for the radiation resistance. What is the polarization of the antenna