Transmission-Line Baluns

Balun is a portmanteau of BALanced and UNbalanced. This refers to the function of these transformers, which is to convert a balanced signal (two signals working against each other where ground is irrelevant) to an unbalanced signal (a single signal working against ground or pseudo-ground), and vice versa. Baluns are used in many different contexts, including in transmission lines.

How transmission line baluns work

Transmission line baluns are very simple devices, often consisting of a few windings of coaxial cable. They also work on a range of materials. Trasmission line baluns are sometimes used without a magnetic material and sometimes with. They can provide signal conversion without requiring AC or battery power.

While these devices often have ferrite cores, which are less common and more expensive than cores made with laminated iron, they are among the simplest transformers currently in usage.

Types of transmission line baluns

Transmission line baluns are designed with gender-specific connectors. Connector types can include IDC (insulation-displacement contact), which is used in telecommunications, networking, and various domestic and industrial low-voltage applications, and BNC (Bayonet Neill-Concelman), a miniature quick connect/disconnect radio frequency connector used with coaxial cable.

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Description Price Balanced Connector Impedance Balanced Connector Type Unbalanced Connector Gender Unbalanced Connector Impedance Unbalanced Connector Type
RS Stock No. 624-6369
120Ω IDC Female 75Ω BNC