The difference between an ideal duplexer and a real duplexer

Infineon / Mitsubishi / Fuji / Semikron / Eupec / IXYS

The difference between an ideal duplexer and a real duplexer

Posted Date: 2024-02-01

The difference between an ideal duplexer and a real duplexer

A duplexer is a device used to support two-way communication and has a wide range of uses in a variety of situations. Here are a few common duplexer applications:

1. Wireless Communications: In wireless communications, duplexers are used to support two-way communication in devices such as mobile phones, radios, and walkie-talkies. It allows users to send and receive voice, data and other information simultaneously for real-time two-way communication.

2. Network Communication: In computer networks, duplexers are used to achieve full-duplex communication, where data can be transmitted in both directions simultaneously. This plays an important role in various network scenarios such as the Internet, LAN, and WAN.

3. Telecommunications systems: In telephone and mobile communication systems, duplexers are used to support two-way voice communications. It allows users to send and receive voice at the same time, making telephone communications and mobile communications more efficient and convenient.

4. Radio communications: In radio communications, duplexers are used to support two-way radio communications, such as radio broadcasting, satellite communications, and aeronautical communications. It simultaneously allows broadcast stations to send signals and receive signals from user devices for efficient two-way communication.

5. Video communications: In applications such as video conferencing and remote monitoring, duplexers are used to support two-way video and audio communications. It allows participants to communicate via voice and video simultaneously for real-time face-to-face communication.

Through duplexers, we can achieve two-way, real-time, and efficient communication and exchange.

A duplexer is just a complex of two filters. Therefore, the characteristics of the duplexer are based on the characteristics of the filter. In most mobile communications, the gap between the transmit frequency and the receive frequency is not large. So one of the key requirements of a duplexer is how to separate the receiver frequency from the transmitter frequency. The ideal duplexer requirement is to have very sharp frequency characteristics without any overlap, but in reality you can't avoid a certain degree of overlap.

Comparison of frequency characteristics between ideal duplexer and actual duplexer

The difference between an ideal duplexer and a real duplexer is primarily in their performance and functionality in duplex communications.

An ideal duplexer is a hypothetical device that is capable of perfectly simultaneous two-way communication, i.e. it can send and receive data at the same time without any interference or collision. This means that in an ideal duplexer, the signals for sending and receiving data can be completely independent without interfering with each other.

However, in the real world, actual duplexers cannot achieve the ideal state due to various technical and physical limitations. Practical duplexers typically face some of the following limitations:

1. Time division: In some cases, the actual duplexer needs to switch between transmitting and receiving, so transmitting and receiving operations cannot be performed at the same time. This can result in some degree of latency and wasted bandwidth.

2. Frequency segmentation: In wireless communications, actual duplexers may need to allocate transmit and receive signals to different frequency bands or channels to avoid interference. This may lead to a waste of spectrum resources and limited frequency resources.

3. Signal interference: The transmit and receive signals in a real duplexer may interfere with each other, especially when communicating on the same frequency band or channel. This may result in reduced data transfer rates or reduced quality.

Despite these limitations of practical duplexers, through continuous technological advancement and optimization, various practical duplex solutions have been successfully developed to achieve efficient two-way communication in real-world environments.

Review Editor: Huang Fei

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