RF Transformer Calculator

An RF transformer is a passive component used to match impedances between different parts of an RF circuit. It uses magnetic coupling to transfer energy while providing impedance transformation, ensuring maximum power transfer and minimal reflections.

The turns ratio is calculated as the square root of the impedance ratio. For primary to secondary: Np/Ns = √(Zin/Zout). This relationship ensures proper impedance matching between source and load.

Np/Ns is the primary-to-secondary turns ratio (step-down when >1, step-up when <1), while Ns/Np is the inverse secondary-to-primary ratio. Both ratios are commonly specified depending on the transformer orientation and application.

Common RF impedances include 50Ω (most RF systems), 75Ω (cable TV, video), 300Ω (antenna feedlines), and 600Ω (audio/telecom). The choice depends on the specific application and system requirements.

Frequency determines the transformer's core material, winding technique, and parasitic effects. Higher frequencies require careful attention to core losses, leakage inductance, and inter-winding capacitance to maintain performance.

This calculator provides the basic turns ratio for any impedance transformation. For broadband applications, additional considerations like core material, winding configuration, and transmission line effects must be evaluated separately.

Impedance mismatch causes signal reflections, power loss, and potential damage to transmitters. The VSWR increases, reducing system efficiency and potentially causing frequency-dependent amplitude variations.

The calculated ratios are mathematically exact for ideal transformers. Real-world performance depends on core material, construction quality, frequency response, and parasitic elements that aren't accounted for in this basic calculation.