A type of antenna that utilises a slot or gap cut into a conducting surface to radiate electromagnetic waves. The slot acts as the radiating element, functioning as an inverted version of a dipole antenna - where a dipole has two rods separated by a gap, a slot antenna has a gap in a continuous surface. One of the main advantages of slot antennas is their ability to be integrated directly into the surface of a device or vehicle, making them an attractive choice for applications where space or aerodynamics are critical considerations. Despite their compact design, slot antennas can achieve good radiation efficiency and are often used in applications such as radar systems and satellite communications.
Slotted Waveguide
In a slotted waveguide antenna, slots are specifically cut into the walls of a waveguide - a special type of structure designed to guide electromagnetic waves from one point to another. The size, shape, and position of these slots can be carefully controlled to direct the radiated signal in a specific direction, or to create a specific radiation pattern. Slotted waveguide antennas are often used in applications that require high gain and narrow beamwidths, such as radar systems. Their robust, solid-state construction with no moving parts also makes them well-suited to harsh environments.