RF Power Divider

Introduction

RF power divider is a device that divides the energy of one input signal into two or multiple outputs of equal or unequal energy. In turn, it can combine the energy of multiple signals into one output, which can also be called combiner.

A certain degree of isolation shall be ensured between the output ports of a power divider. It is also called over-current divider, which is divided into active and passive ones. It can equally distribute one channel of signal into several outputs. Generally, each channel has several dB attenuation. Different signal frequencies lead to different attenuation of the divider. In order to compensate for attenuation, a passive power divider is made after adding an amplifier.

Design principle

A microwave power divider is a device that divides the energy of one input signal into two or multiple outputs of equal or unequal energy. It can also combine the energy of multiple signals into one output. At this time, it can also be called a combiner. The main technical parameters of power divider include power loss (including insertion loss, distribution loss and reflection loss), voltage standing wave ratio of each port, isolation between power distribution ports, power capacity and bandwidth.

Characteristic

A RF power divider is a multi port device with one port on one side and multiple ports on the other. Although power dividers rely on frequency operation, they usually distribute the power of input ports equally to output ports within their specified bandwidth. Some power divider variants have asymmetrical power allocation, and some ports receive more input signal power than others, although these devices are often referred to as couplers.

Type

1. A certain degree of isolation shall be ensured between the output ports of a rf power splitter, which can be divided into active and passive.

(1). Active power splitters are mostly found in six power points, eight power points and a few four power points. The main principle is to add a bipolar amplifier unit composed of two low-noise broadband transistors.

(2). Passive power divider: passive distribution through inductance, resistance and capacitance. The common passive power divider is two power divider and four power divider.

2. Other classification methods include:

(1). According to the number of channels, the power divider splitter is divided into two channels, three channels, four channels and a multi-channel power divider formed by cascading them.

(2). The power distributor is divided into microstrip power divider and cavity power divider according to the structure

(3). According to the distribution of energy, it can be divided into: equal power distributor and unequal power distributor

(4). According to the circuit formation, it can be divided into: microstrip line, stripline, coaxial cavity distributor

Application

RF power divider is a passive device, mainly used in the field of radio technology. They couple a defined amount of electromagnetic power in the transmission line to the port so that the signal can be used in other circuits. The essential feature of power dividers is that they only couple the power flowing in one direction. The power supply entering the output port is coupled to the isolated port, but not assigned to the port. The directional splitter designed to distribute power equally between two ports is called a hybrid splitter.

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