What is a directional antenna?

Directional antenna (Directional antenna) is an antenna that transmits and receives electromagnetic waves in one or several specific directions, and emits and receives electromagnetic waves in other directions, which is zero or very small. Directional antennas are often used to cover relatively long streets and have the following advantages:

1, with large forward gain

2, can suppress the backward signal, when the cell will cause potential interference to the cell behind it, this characteristic is very useful. Directional antennas can improve indoor coverage of some buildings within the microcellular coverage scale.

Type difference: The antenna has different radiation or acceptance capabilities for different directions in space, which is the directionality of the antenna. According to the different directivity, the antenna has two kinds of omnidirectional and directional. The following is mainly to explain the differences between them and the relevant parameters.

Omnidirectional antenna

Omnidirectional antenna, that is, in the horizontal pattern as 360° uniform radiation, is commonly referred to as non-directional. In general, the smaller the lobe width, the greater the gain. Omnidirectional antenna is generally used in communication system with close interval, large coverage scale and low price. The gain is generally less than 9dB. The radiation scale of an omnidirectional antenna is more like that of an apple.