Introduction to the technical indicators and functions of the power divider

Power divider is also called power divider, also called combiner, also called overcurrent divider. There is a few dB of attenuation, the signal frequency is different, and the attenuation of the splitter is also different. In order to compensate for the attenuation, a passive power divider is made after adding an amplifier.

The technical indicators of the power splitter include frequency range, withstand power, distribution loss from main circuit to branch, insertion loss between input and output, isolation between branch ports, voltage standing wave ratio of each port, etc.

1. Frequency range. This is the working premise of various RF/microwave circuits, and the design structure of the power divider is closely related to the operating frequency. The operating frequency of the distributor must first be clarified before the following design can be carried out

2. Withstand power. In high-power dividers/combiners, the maximum power that circuit elements can withstand is the core indicator, which determines what form of transmission line can be used to achieve the design task. Generally, the order of transmission line power from small to large is microstrip line, stripline, coaxial line, air stripline, and air coaxial line. Which line to use should be selected according to the design task.

3. Distribution loss. The distribution loss from the main circuit to the branch circuit is substantially related to the power distribution ratio of the power divider. For example, the distribution loss of the two-half power divider is 3dB, and the distribution loss of the four-half power divider is 6dB.

4. Insertion loss. The insertion loss between the input and output is due to factors such as the imperfect medium or conductor of the transmission line (such as a microstrip line), and the loss caused by the standing wave ratio at the input end is considered.

5. Isolation. The isolation between branch ports is another important indicator of the power divider. If the input power from each branch port can only be output from the main circuit port, and should not be output from other branches, this requires sufficient isolation between the branches.

6. Standing wave ratio. The smaller the VSWR of each port, the better.

The function of the power divider is to equally divide the input satellite IF signal into several outputs, usually with two power divisions, four way sma splitter, six power divisions, and so on. The working frequency of the power divider is 950MHz-2150MHz, and everyone must be familiar with the power divider. The uses and performances of the above three devices are completely different, but the names are often confused in daily use, making it easy for people to be confused in use. In a satellite TV receiving system, multiple satellite receivers share one antenna, several antennas share one satellite receiver, and two or more satellite receivers and more than two antennas share the connection between them. In addition to relying on cables, It is mainly realized by the combined programming of the switcher. The power divider is used to connect multiple satellite receivers. If a set of antennas is to be connected to multiple satellite receivers, a power divider is used. The power divider is selected according to the number of receivers connected. If you connect two receivers, use two power dividers. To connect four receivers, use four power dividers.