A straightforward yet fundamental type of antenna that consists of two conductive elements such as metal wires or rods, which are arranged end to end with a small gap between them. The transmitter or receiver is connected at the center. A dipole antenna radiates or receives equally well in all directions perpendicular to the axis of the antenna, making it an omnidirectional antenna when used in a horizontal alignment. Dipoles are the most basic type of antenna and serve as a reference model for many other antenna designs.
Sleeve Dipole
The Sleeve Dipole antenna design type, also known as a coaxial dipole antenna, is a popular choice due to its broad bandwidth and simple construction. It consists of a standard dipole antenna enclosed by a conductive tube, or sleeve. This sleeve acts as a balun, converting the unbalanced signal from the coaxial cable to a balanced signal suitable for the dipole. The sleeve and the inner conductor of the coaxial cable form two radiating elements, which are in phase and add up to give a higher gain. The overall length of the antenna is approximately half the wavelength of the frequency it is designed to operate on. The Sleeve Dipole antenna is omnidirectional, meaning it transmits and receives signals in all horizontal directions equally. The design of the Sleeve Dipole antenna is straightforward, making it easy to construct and install. It also provides a good impedance match to the transmission line, reducing signal loss and improving overall performance.