Directional antenna is defined as radiation that appears at a certain angle range on a horizontal pattern, which is commonly referred to as directional. Like omnidirectional antennas, the smaller the lobe width of the transmitted wireless network signal, the greater the gain. The advantages of directional antennas are generally applied in communication systems in environments with long communication distances, small coverage range, high target density, and high frequency utilization.

　　Omnidirectional antennas are defined as those that exhibit uniform radiation at 360 ° on a horizontal pattern, also known as directionless. In general, the smaller the lobe width of a signal, the greater the gain. The advantages of omnidirectional antennas are generally applied in communication systems for short distances, wide coverage, and relatively cheap prices.

　　Due to the fact that directional antennas are oriented at an angle during use, they can be used like satellites by pointing directly in their direction, which prevents signal diffusion and effectively faces the designated signal source, resulting in a longer application distance; However, omnidirectional antenna signals are prone to diffusion and concentration, resulting in close application distances.

　　An omnidirectional antenna emits signals in all directions, and can receive signals in all directions, front, back, left, and right. A directional antenna is like a bowl shaped reflection surface behind the antenna, and signals can only be transmitted to the front. The signals emitted to the back are blocked by the reflection surface and reflected to the front, enhancing the signal strength in front. The following figure shows the signal radiation diagram of the directional antenna. The main radiation range of directional antennas is like an inverted, incomplete cone.

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