// Antennas › Wire Antennas

Dipole Antenna Calculator

Calculate dipole and monopole antenna dimensions, resonant frequency, radiation resistance, bandwidth and efficiency. Covers half-wave, quarter-wave and full-wave dipoles.

// Parameters

Frequency

Velocity Factor

—

Antenna Length

Velocity Factor

—

⚠ Please check your inputs.

// Results

📶

Enter parameters and click Calculate

Resonant Frequency—MHz

Total Length—mm

Each Arm Length—mm

Wavelength (λ)—mm

Radiation Resistance—Ω

Directivity—dBi

Feed Impedance—Ω

Half-Wave Dipole
L = 0.5 · λ · VF = 0.5 · (c/f) · VF
Rrad ≈ 73.1 Ω · Directivity = 2.15 dBi
Feed Z ≈ 73 + j42.5 Ω (at resonance ≈ 73 Ω)