RF circulators work as passive devices with three ports to control the signal flow in a circuit for telecommunication devices. Most RF circulators work in conjunction with RF isolators, which also function as passive devices with two ports. Most providers of RF circulators are also RF manufacturers or suppliers.

Manufacturers of RF circulators make these components for radiation therapy equipment, food and medical sterilization devices and cargo screening equipment. Information about RF circulators provides buyers with power ratings, connector types, isolation and special instructions for storage and handling. When you shop for a RF circulator, keep the following options in mind:

1. Determine the wattage capability you need and the maximum power the RF circulator provides.

2. Increase your price options and variety with online vendors.

3. Look for one-stop shops that provide RF circulator products.

Action Steps
The best contacts and resources to help you get it done

Consider the connection and power rating for RF circulators

Most RF circulators use a frequency between 0.8 and 18.0 GHz and connect via an N-Female or SMA-female connection. Look for vendors who provide you with all the information you need in an easy-to-read chart.

I recommend: MECA Electronics, Inc. provides specs in a chart divided by category for each RF circulator. Sonoma Scientific, Inc. organizes its products by category and provides a chart with features for frequency, isolation and power watts. DiTom Microwave Inc. uses a chart to provide specs on RF circulators and color-codes the chart to show SMA-Female and K-Female connectors.

Search for RF circulators online

Specialized directories often help you find the resources you need quicker than general search engines. You also have more options available than if you search locally.

I recommend: Use the directory of RF circulator manufactures at Interfacebus.com to locate companies by name and product. Register with GlobalSpec and gain access to a directory of RF circulator suppliers and other telecommunication resources. Electronics Manufacturers Directory provides a list of RF isolator manufacturers.

Purchase RF circulators from online suppliers

Online vendors often offer competitive rates for RF circulators and supplies. Look for vendors who offer free quotes and provide specs for their products.

I recommend: Get specs and free quotes from RF-Lambda Inc., which sells coaxial and drop-in RF circulators, as well as RF isolators. JQL Electronics Inc. carries a variety of RF circulators, isolators and supplies. If you need fabricated RF components, consider EM Design LLC, which develops three-port circulators and isolators in S, L, C or X bands.

Tips & Tactics

Helpful advice for making the most of this Guide

• •  Keep in mind the isolation factor on an RF isolator, which tells you how much interference each port causes the other during operation.
• •  Many RF circulator manufacturers provide consultation services for industry specific development. If you can't find the RF components with the specs you need for your business, contact a manufacturer about these services.