Circulators and isolators are passive devices used in modern RF and microwave equipment

since some decades. By using them the stability, performance, and reliability of the systems can be improved, and often better and cheaper solutions are possible. In addition, in certain applications, e.g. one-port-amplifiers, the use of circulators is a must.

This booklet will help you to understand these important devices and give you some hints

to use them effectively.