RF Attenuators & Isolators

RF attenuators are two-port electrical components that reduce the level of the signal in radio frequency applications, also known as 'attenuating'. Often used to stop a circuit from receiving too high a signal, they can be an important part of many electrical applications, including testing equipment. Some RF attenuators can be simple devices, while others are more complex.

They are also used to optimize the power transfer from source to load by reducing signal strength and converting energy into heat.

An RF isolator, also a two-port device, protects RF equipment or components in a system from signal reflection and isolates one part of a circuit from the other. It can isolate power at the second port whilst making sure the power is transmitted from port one to port two.

Read on to discover more about the different types of RF attenuators and isolators.

Types of RF attenuators

RF attenuators can be fixed, variable or switched and the type will depend on the attenuator function.

Fixed RF attenuators

These are made to attenuate a specific amount of signal which will stay fixed. There are various attenuation levels available for these products, depending on your electronic attenuator requirements. Levels can range from 0.4dB up to 20dB with a 10dB RF attenuator being one of our main attenuator products.

Variable RF attenuator

These attenuators allow for adjustment of the attenuation level. By altering the voltage, the attenuation can be changed and set to a specific level, allowing for continuous change. They can either be analog or digital, depending on their function.

Switched RF attenuators

As the name suggests, these are made up of switches which allow varying levels of attenuation. The level can be changed in stages, and they can often be used in test equipment where the signal level needs to be varied at certain intervals.

Types of RF isolator

An RF isolator is either a drop-in isolator or a coaxial connector isolator. A drop-in isolator is used in instances where the input and output ports match on a micro-strip circuit board. A coaxial isolator is used in a cable to isolate one part of a circuit.

Specifications and configurations

We stock a wide range of RF attenuators and isolators in a variety of specifications and configurations. As an example, the RF isolator SMA is a popular configuration which is mainly used for small cables and less spacious circuits. A BNC attenuator, however, is often a choice for larger cables.

It's easy to filter your search results on our drop-down menus based on manufacturer, type, attenuation level and impedance required. You can also choose a gold, nickel, or tarnish-resistant finish.

With a range of options for RF attenuators and RF isolators, you can be sure to find the right product for your circuit needs.

Why choose us

With a large range of products from high-quality manufacturers, including Amphenol RF, Radiall and RS PRO, you won't be short on choice.

For help or advice, simply get in touch and our experts will be on hand to answer any questions you have about your RF attenuator or RF isolator product needs. We also offer technical product support to ensure ongoing assistance.

If you already know the exact product you need, our Quick Order Portal allows you to easily search by stock or part number and add to your cart.

And don't forget, we have expert advice and the latest industry information on our expert advice hub.