Communication system duplexer and multiplexer and duplexer and multiplexer method

Abstract

This invention discloses a duplexer and a multiplexer of the communication system and a method to realize them on a PCB circuit, which applies a 3db bridge and a low pass filter to constitute a hopstreet duplexer without waste band channels, in which, the signals are shunted and combined by the design of the circuit structure and power distribution of the 3-db bridge and phase offset function, the band filter of the low pass filter and the reflection function of a stopband to make up of a costless duplexer in theory to merge the two channels of different frequencies and reduce loss to increase volume and working bandwidth, then a multiplexer is formed by cascading multiple duplexers.

Description

technical field [0001] The invention relates to communication equipment, in particular to the multiplexer and duplexer combination and branching technology of the communication system. Background technique [0002] With the development of wireless mobile communication, users put forward higher and higher requirements for the rate and service quality of wireless communication, and mobile communication technology is also developing rapidly. The development of each generation is the breakthrough of technology and the innovation of concept. From the analog and frequency division multiple access (Frequency Division Multiple Access, referred to as "FDMA") technology that began in the 1980s, to the second generation (2rd Generation, referred to as "2G") time division multiple access (Time Division Multiple Access, referred to as "TDMA") and Code Division Multiple Access (CDMA) technology, and the current third-generation mobile communication system (3G) can provide a wider frequen...

AI Technical Summary

Problems solved by technology

figure 1 The shown resonant filter combination scheme cannot meet the requirements in many aspects, and a new multiplex combination design technology is urgently needed to meet new requirements

[0011] In practical applications, the above solutions have the following problems: Overall, they are large in size, high in cost, unstable and difficult to implement on PCBs

However, because the band-pass filter used in it generally has a narrow pass band, it cannot flexibly realize multi-system composite duplexing, and the cost is high.

In addition, in many cases, the scheme must combine various forms of technologies such as low-pass filter, high-pass filter, band-pass filter, and band-stop filter to realize the function of multi-system combination, and such as band-pass filter In order to realize the function of small insertion loss, its volume will be very large, and it cannot be realized by microstrip circuit technology.

Images