The most commonly used dipole is the half wavelength dipole ( -dipole).
This antenna offers many advantages like
(1) Reasonable size
(2) Radiation pattern with single maximum
(3) Manageable input impedance
A -dipole is shown in Fig.
For the -dipole .
The current distribution on the dipole is
The radiation electric field is given as
The radiation pattern for the dipole is shown in Fig.
The total power radiated by the -dipole is
Solving the integral numerically the total radiated power and the radiation resistance of the -dipole are
The radiation resistance of the -dipole is about 73 ohms. The dipole due to the near fields has a reactance of about 34 ohms which can be removed by reducing the length of the dipole to about .
The -dipole dipole has an impedance which can be easily matched to 50 ohms using impedance transformers.
For the -dipole dipole we have following parameters:
Radiation pattern very similar to the Hertz dipole
-dipole). 
-dipole is shown in Fig. 
-dipole 
. 
-dipole is 
-dipole are 
-dipole is about 73 ohms. The dipole due to the near fields has a reactance of about 34 ohms which can be removed by reducing the length of the dipole to about 
. 
-dipole dipole has an impedance which can be easily matched to 50 ohms using impedance transformers. 
-dipole dipole we have following parameters: 
