Coaxial isolators are two-port passive non-reciprocal devices that allow RF/microwave signals to pass with low loss in the forward direction while providing high isolation in the reverse direction. They are essential for protecting transmitters from reflected power, improving signal purity in communication, radar, and test systems.
The coaxial isolator is a two-port passive non-reciprocal device based on the ferrite gyromagnetic effect. It is engineered to permit unimpeded forward signal transmission while absorbing and blocking reverse signals with extreme efficiency. This directional behavior makes it a fundamental building block for source protection, reflection suppression, and signal stability in RF and microwave systems.
Working Principle
Inside a precision coaxial cavity, a ferrite element is placed within a permanent magnetic bias field. A resistive termination is integrated onto one port of an internal Y-junction (circulator topology), converting it into a two-port isolator. Forward signals travel from Port 1 to Port 2 with minimal insertion loss, whereas reverse signals entering Port 2 are routed to the internal termination and dissipated as heat, achieving high isolation. This effectively prevents reflected energy from reaching sensitive upstream components such as power amplifiers.
Key Features
High Isolation & Low Insertion Loss: Delivers strong suppression of reverse signals while preserving forward signal strength.
Wide Frequency Coverage: Available in standard and custom bands ranging from hundreds of MHz to tens of GHz.
Compact Coaxial Package: Robust, shielded construction suitable for bench-top and field environments.
Plug-and-Play Connectivity: Standard coaxial interfaces (SMA, N-type, etc.) ensure quick integration without tuning.
Excellent Stability: Temperature-stable ferrite materials and magnetic circuits guarantee reliable long-term performance.
Specifications
