What is the slot antenna?

The antenna is a simple type of antenna that consists of a metal plate and one or more slots. The layout and size of these slots determines the frequencies that this type of antenna can pick up. The most common use of the slot antenna is in the towers of radar and mobile phones. They work best with short wavelengths in the range of ultra high frequency (UHF).

The main component of the antenna of the slot is a large, rigid metal leaf. It cannot be poor or penetrate in one or the other. In most slots, the metal sheet is rectangular and the length of slots or slots sliced ​​into metal runs parallel to the longer side of the rectangle.

The slot antenna can have one slot in the middle, but usually has a series of slots spread on both sides of the center. Each slot is half the length of the wavelength that the antenna is designed to receive and is much less wide than long. Creating an antenna that has multiple slots requires Precise to calculate the gap between the slots and the edges of the antenna.

The dipole antenna, which is simply a metal pole, works similar to the slot antenna. It would be possible to cut the slot from the metal sheet, create a slot antenna and then use a piece that was cut as a dipole antenna, optimized for accepting the same frequency. The difference between the two types of antennas is polarization of the electromagnetic signal.

When an electromagnetic signal is accepted by an antenna slot, it excites the antenna and creates both electrical and magnetic fields when the signal moves through the antenna and to the receiver connected to it. The current travels around the metal leaf and is not limited to the slot. The electric field is vertical, while the magnetic field is horizontal. This is opposite the effect on the dipole antenna and the electromagnetic signal mpolarization will be vertical in a horizontal slot and horizontally in a vertical slot.