Dual Junction Isolator vs. Dual Junction Circulator: Key Differences

This page compares a Dual Junction Isolator and a Dual Junction Circulator, highlighting the key differences between the two. Let’s delve in!

Understanding Circulators

A circulator is a 3-port device, as depicted in Figure 1. It allows input and output between adjacent ports. For example, an input at port 1 will result in an output at port 2, and so on. It operates either clockwise or anti-clockwise, directing the signal flow.

Isolators: Protecting Sensitive Equipment

As we know, if any one port of a circulator is terminated with a load, it functions as an isolator. Isolators are crucial for protecting sensitive test and measurement equipment, like signal generators and signal analyzers, from unwanted reflections.

Poor isolation can lead to reverse reflections from the output, potentially damaging the transmitter or signal generator.

Dual Junction Devices: Enhanced Isolation

Typically, a dual junction circulator or isolator offers significantly better isolation compared to a standard 3-port circulator or isolator. This enhanced isolation provides superior protection.

Dual Junction circulators/isolators are 4-port devices, as shown in Figure 2. The additional port provides that extra layer of isolation.

Visual Examples

The following figures showcase examples of dual junction circulators and isolators:

Figure 3 depicts a Dual Junction Circulator from DiTom Microwave Inc. USA.

Figure 4 depicts a Dual Junction Isolator from DiTom Microwave Inc. USA.