The power divider is a device that divides the power of one input signal into two or more outputs with equal or unequal energy, and can also conversely combine the energy of multiple signals into one output, when it is called combiner.
A certain degree of isolation should be guaranteed between the output ports of a power divider. Power divider is also called over-current divider. There are two types: Active Divider and Passive Divider. It can evenly distribute one signal into several outputs.
Generally, each channel has a few dB attenuation. The signal frequency is different, and the attenuation of the divider is also different. In order to compensate for the attenuation, a passive power divider is made after adding an amplifier.
The technical parameters of the power divider include frequency range, withstand power, distribution loss from main circuit to branch circuit, insertion loss between input and output, isolation between branch circuit ports, voltage standing wave ratio of each port, etc.
This is the working premise of various RF/microwave circuits, and the design structure of the power divider is closely related to the working frequency. The operating frequency of the allocator must be clarified first before the following design can be carried out.
In a high-power divider/combiner, the maximum power that circuit components can withstand is the core indicator, which determines what form of transmission line to be used to achieve the design task.
Generally, the sequence in which the transmission line withstands power from small to large is microstrip line, strip line, coaxial line, air strip line, and air coaxial line.
The transmission form should be selected according to the design task.
The distribution/split loss from the main circuit to the branch circuit is essentially related to the power distribution ratio of the power divider. For example, the distribution loss of the Bisection Power Divider is 3dB, and the distribution loss of the Quarter Power Divider is 6dB.
The insertion loss between the input and output is due to factors such as the unsatisfactory medium or conductor of the transmission line. And the loss caused by the VSWR at the input also needs to be considered in the design.
The isolation between split ports is another important specification of the power splitter. The power of each branch port can only be from the main port, not from other neighboring ports. This requires sufficient isolation between the branch ports.
The smaller the voltage standing wave ratio of each port, the better.
The common use of the power divider is to connect multiple satellite receivers. It is used to divide the input satellite IF signal into several outputs equally.
Here are the common types of Power Divider/Splitter
Choose a power divider according to the number of connected receivers. If two receivers are connected, 2-way power splitters are used, and four receivers are connected to 4-way power splitters.