RF Power divider: a power divider that equally distributes signal power from one port to the output port;

RF Combiner: Power synthesis, which adds two or more signals to a port;

RF Directional coupler : The proportional coupling of a signal to a coupling port.

The power splitter is reversed and is a combiner.A coupler can be considered a kind of power divider, but not equally divided.

Power divider: power divider, which distributes the signal power of one port equally to the output port;Combiner: Power synthesis, which adds two or more signals to a port;Coupler: The proportional coupling of a signal to a coupling port.The power splitter is reversed and is a combiner.A coupler can be considered a kind of power divider, but not equally divided.

Directional  coupler: is the one input signal in proportion to the distribution of multiple output;For example, 10dB coupler, input signal is 50dB, then the output signal is direct output and coupled output, respectively, 50db-insertion loss, 40DB-insertion loss.

Combiner: combines multiple input signals into one input.

1. In mobile communication, due to the sharing of multiple channels, in order to avoid intermodulation interference caused by rf coupling between different channels, and considering economic, technical and site setting factors, antenna sharing device should be used for transmission.

2. The combiner consists of a cavity resonator and a circulator. The cavity resonator is a band-pass filter with high Q value and low insertion loss.Circulator is a three - fracture device with low forward loss (0.8dB) and high reverse loss (20dB).

3. In order to enhance the stability of the combiner, internal matching technology is generally adopted, which means that the cavities are not connected by soft cables.In order to reduce the volume, the square cavity structure is generally used

Main technical indicators of Combiner:

1. Insertion loss, 4 channels usually less than 3.6dB, 8 channels usually less than 4.0dB;

2. The isolation degree between channels is usually greater than 80dB;

3. The isolation between output and input ports is usually greater than 80dB.

4. Frequency drift, usually after a year of aging should not exceed 3ppm;

5. Enter a VSWR smaller than 1.5dB

Combiner test:

1. Insertion loss test;

2. Test the isolation degree between channels;

3. Input standing wave ratio test;

4. The test line of the above measurement network analyzer should be corrected.

The combiner is also divided into two types: same frequency combiner and different frequency combiner.For the combination (synthesis) of signals in the same frequency band, because the channel interval is very small (250KHz), the frequency selection method of resonant cavity can not be used to combine, and the common method is to use 3dB bridge.

The 3dB bridge has two input ports and two output ports. After the combination of two carrier frequencies, the two output ports can be used as signal output. If only one output signal is needed, the other output port needs to be absorbed by the load.It is recommended that the two signals be connected to signal transmission cables in different directions to avoid the use of expensive power amplifiers.In general, power splitters can also be used as combiner.The difference is that the power is different.

A cross-band combiner combines the signal power of two different bands.For example, CDMA and GSM power synthesis;CDMA/GSM and DCS power synthesis.As the frequency interval between the two signals is large, the frequency selection method of resonant cavity can be used to synthesize the two signals, which has the advantages of small insertion loss and high out-of-band suppression. The out-of-band suppression index is one of the important indexes of the combiner. If the out-of-band suppression is insufficient, mutual interference between GSM and CDMA will be caused.

If the combiner is not connected to 3G and is directly connected to 2G devices, the 3G port needs to be closed.That's what the load does.

Load code can be simply understood as a very large loss of decay devices.The signal through the device may be very large decay;

Power divider is a base station to receive, from the antenna down the signal is distributed to multiple receiving equipment processing;

Coupler is a base station transmission, which combines the carrier generated by multiple devices ready for transmission into one line and transmits it from the antenna. Generally, after the combination, it will be converted and amplified before reaching the antenna port.

3. 1, power splitter is the most common passive device, used to divide one signal into multiple signals, playing the role of power distribution, common two power points, three power points, four power points.The power splitter applied in reverse forms a combiner.

3.2. A coupler is a signal divided into two unequal signals.The coupler has three terminals, which are input, straight-through and coupling terminals.According to the power difference between the input and the coupling end, it is divided into 5dB, 6dB, 7dB, 10dB, 15dB and other models. It can also be divided into 1:1, 2:1, 4:1 and other models according to the ratio of the straight-through and coupling end.Of course, power splitters and couplers have losses.

3.3, the coupler and power splitter are essentially used to distribute signals, power splitter is the average distribution of power (that is, the power of each outlet is equal), and the coupler is used in the case of uneven distribution of power, the coupler is divided into input end, straight end, and coupling end.The power of the coupling end is lower than that of the straight end.The coupling degree represents the attenuation value of the coupling end relative to the straight end

3.4,

A coupler is an attenuator, and a combiner combines signals from different systems to share an antenna feed system. A power splitter is a device that divides one signal into several signals.

5, the coupler and power splitter are essentially used to distribute signals, power splitter is the average distribution of power (that is, the power of each outlet is equal), and the coupler is used in the case of uneven distribution of power, the coupler is divided into input end, straight end, and coupling end.The power of the coupling end is lower than that of the straight end.The coupling degree represents the attenuation value of the coupling end relative to the straight end.

4, the outlet end of power splitter is evenly distributed, generally 3dB power splitter, each outlet loss is 3dB;

The coupler is divided into direct end and coupling end. The direct end theoretically does not lose energy, but there will be a small amount of loss in practical application.Coupling end loss, generally is the labeled loss of the coupler, such as 5dB of the coupler, coupling end loss, is 5dB.(generally 5dB, 6dB, 7dB, 10dB, 40dB, etc.).

In the maintenance process, it is best not to replace each other casually, that is, the couplers of different energy loss can not be replaced with each other casually.In the construction, it is better to use each device strictly in accordance with the design, not to replace each other at will.