CPL-5028-30-TNC-79

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Introduction

A Radio Frequency (RF) Directional Coupler is an RF component consisting of a pair of transmission line that couples a portion of an incident electromagnetic wave to a secondary transmission line. CPL-5028-30-TNC-79 is one such RF directional coupler in particular which has widespread applications in various industries. This article aims to discuss the application fields and working principle of CPL-5028-30-TNC-79.

Application Fields

CPL-5028-30-TNC-79 has specific applications in two main industries. Firstly, it is a commonly used device in cellular base stations, mainly as a monitor coupler or power splitting coupler which can be used in both receive and transmit paths. Secondly, it can be used in industrial, scientific, and medical (ISM) wireless applications for which short-to-medium range transmission and reception of data is required. Examples of such applications include wireless security systems, RFID readers, wireless industrial sensors, and wireless audio devices.

Working Principle

RF directional couplers such as the CPL-5028-30-TNC-79 works by creating a transmission line with an open-loop section within its structure. This open-loop section is formed from two mutually coupled transmission lines, which have a specific amount of transmission loss between them. An incident electromagnetic wave is incident on the dashed line, also known as the port 3 of the directional coupler, and part of its energy is transmitted through the coupler to the dashed line (port 4). All the energy incident at port 3 is equally split between ports 1 and 2, such that port 1 has an even wave and port 2 has an odd wave with a 90° phase difference. The amount of energy coupled is dependent on the amount of mutual coupling between the two transmission lines, and is adjustable through the use of a variable capacitor.

Conclusion

To summarise, CPL-5028-30-TNC-79 is an RF directional coupler which has specific applications in cellular base stations and ISM wireless applications. The working principle of this device involves using an open-loop section within its structure to couple a portion of an incident electromagnetic wave to the secondary transmission line. This coupling is adjustable through the use of a variable capacitor and serves a variety of purposes depending on the application it is used in.

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