In the application of wireless bridges, relay transmission is an important means to extend the coverage of wireless networks and solve signal transmission obstacles. There are three main ways of relay transmission in wireless bridges, each with its own unique application scenarios and advantages. The following is a detailed description of these three relay transmission methods:

1、Single-mode single wireless bridge relay

1.1 Working principle:

Use a single-mode wireless bridge as a relay point, connected to two antennas through a power divider.
One antenna is connected to the wireless bridge at the monitoring point or transmitting end, and the other antenna is connected to the wireless bridge at the monitoring center or receiving end.

1.2 Features and applicable scenarios:

Cost-effective: This is the most cost-effective relay mode, as only one wireless bridge is used.
Bandwidth reduction: However, due to the use of power dividers, the bandwidth is reduced by more than half, making it unsuitable for large projects or scenarios with high bandwidth requirements.

1.3 Applicable scenarios: 

Suitable for small, cost-sensitive wireless monitoring or data transmission projects.

2、Single-mode dual wireless bridge relay

2.1 Working principle:

Use two single-mode wireless bridges as relay points, and connect the two wireless bridges through a switch.
One of the wireless bridges is aligned with the monitoring point or the wireless bridge at the transmitting end to receive signals; The other wireless bridge is aimed at the monitoring center or the wireless bridge of the receiving end, and is used to send signals.

2.2 Features and Applicable Scenarios:

Less bandwidth loss: Although using a relay will lose some bandwidth, compared to a single-mode single-wireless bridge relay, the bandwidth loss is smaller.

2.3 Increased equipment costs: 

Two wireless bridges and one switch are required, resulting in higher equipment costs.
Applicable scenarios: It is suitable for scenarios with long transmission distances, high bandwidth requirements, and the need to avoid obstacles, such as large-scale parks and urban surveillance.

3、Dual-mode/multi-mode single wireless bridge relay

3.1 Working principle:

Use a dual-mode or multi-mode wireless bridge as a relay point, with two or more antennas aimed in different directions.
One or more antennas are used as the receiving end, aligned with the monitoring point or the wireless bridge of the transmitting end; The other antenna is used as the transmitting end, aligned with the monitoring center or the wireless bridge of the receiving end.

3.2 Features and applicable scenarios:

Powerful performance: Dual-mode or multi-mode wireless bridges support multiple signal transmission modes, providing high flexibility and performance.
Cost saving: There is no need to use multiple wireless bridges and additional power dividers or switches, which reduces equipment costs.
Easy installation: The installation process is relatively simple, reducing the difficulty and time of construction.
Applicable scenarios: It is suitable for complex scenarios such as very long transmission distances, extremely high transmission bandwidth requirements, the need to avoid multiple obstacles, and the construction of MESH networks.

The relay transmission methods of wireless bridges are diverse, and each method has its own unique advantages and applicable scenarios. When selecting a relay method, it is necessary to consider the actual needs and project characteristics to ensure the stability and efficiency of the wireless network.