Yagi Antenna Calculator

This tool computes Yagi antenna parameters by converting user inputs into a practical design model. It uses frequency, number of elements, and physical dimensions to determine element lengths, director spacing, and overall boom length; it then provides estimated gain, impedance, and usable bandwidth.

Conceptually, the calculator follows classic Yagi-Uda rules: a driven element, a reflector behind it, and multiple directors along a straight boom. The model scales geometry to the target frequency and accounts for wire diameter and spacing, returning outputs in millimeters and decibels. The results are suitable for quick feasibility checks and initial prototyping.

Who benefits includes RF hobbyists, amateur radio operators, instructors, and engineers performing rapid design iterations. The tool adds value by delivering repeatable parameter estimates, reducing trial-and-error, and enabling documentation-ready specifications. It supports multiple rounds of design exploration and can be used for classroom demonstrations or field planning.

Core features include: multi-input grouping (frequency, element count, diameters), unit-consistent outputs, guidance on valid input ranges, and export-friendly results. The tool does not fetch external data; it relies on built-in design formulas and sensible defaults when inputs are partial or inconsistent. The outputs help with feedline selection and mounting considerations in practical builds.