10262-3

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Within the wide variety of RF signal applications, RF directional couplers are an invaluable tool for measuring and controlling RF signals. To learn more about these components, let’s take a look at the 10262-3 standard, which defines the application field and working principle of RF directional couplers.

To start, let’s look at the three types of couplers defined by the 10262-3 standard. The first type is a two-port directional coupler, which features two inputs and two outputs. The second type is a three-port directional coupler, which has three inputs and three outputs. The third type is a four-port directional coupler, which has four inputs and four outputs. Each type of coupler serves a different purpose and is designed to handle specific RF signal levels and frequencies.

When it comes to the application field of RF directional couplers, the 10262-3 standard defines a minimum insertion loss as well as a maximum return loss and a maximum power rating. The insertion loss and return loss values describe how much power is being lost between the inputs and outputs. The maximum power rating defines the maximum RF signal level that a particular coupler can handle.

In terms of the working principle, the 10262-3 standard defines a set of requirements for a directional coupler to be considered functional. The coupler must have a measured directivity that is greater than 10 dB at the required frequency, and it must have an amplitude unbalance of no more than 1 dB. The coupler\'s isolation must also be greater than 20 dB (for a two-port coupler) or 15 dB (for a three- and four-port coupler). Finally, the out-of-band rejection must be at least 40 dB for third-order products and at least 25 dB for fifth-order products.

The 10262-3 standard defines the application field and working principle for RF directional couplers so that these components may be used correctly and efficiently. As such, RF engineers must be familiar with this standard in order to properly size and design directional couplers for their specific applications.

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