Remote controlled self-turned mixer

Abstract

The invention comprises multichannel carrier-frequency; the carrier -frequency in each channel are respectively connected to the isolator, detector, media filter and controller. It features an isolator that is a dual-junction isolator composed of two single-junction isolators with high isolation level; a coupled signal sensor is set at inside of the isolator to detect the inputted signals and thefrequency of the inputted signals; the detector detects the echo return loss from the input port of the cavity and sends the result to the tuning circuit of the control unit. It uses a medium resonant cavity which can cut down the size of resonator to 1 / 6-1 / 10 of the general cavity, and keep high Q value.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to a remote control self-tuning combiner for a base station. Background technique [0002] The combiner is to combine the signals generated by multiple single-channel transmitters into one signal and send it to the antenna through the feeder for transmission. It is an indispensable device in the base station system and can greatly reduce operating costs and system complexity. Combiners can generally be divided into two types: broadband combiners and narrowband combiners. A broadband combiner can synthesize multiple signals of different wide frequency bands, while the filter unit of a narrowband combiner is generally only tuned to a certain frequency point, and its working frequency band is very narrow. Insertion loss is an important index to characterize the working performance of the combiner. It refers to the transmission loss between the signal from the input end of the main ...

AI Technical Summary

Problems solved by technology

Therefore, the transmit frequency of the transmitter cannot be changed without replacing or retuning the combiner

[0007] At present, the commonly used combiners in the market generally only achieve 2-in-1 or 4-in-1, and the insertion loss is relatively large. The typical insertion loss of 4-in-1 reaches 6 dB. Therefore, when the traffic volume is large, multi-carrier frequency configuration is required. At this time, taking 12 carrier frequencies in each sector as an example, the feedback system needs 3 transmitting antennas and 3 feeders for each sector. In addition, the filters in common filters generally use air dielectrics, and their Q values ​​are relatively low. More cabinets are required, and the floor space increases. Most importantly, the frequency of the usual combiner tuning is fixed. When there is a major change in the frequency plan, the combiner unit needs to be replaced on site, which is extremely inconvenient.

Images