Antenna Design Calculators
8 free online calculators for engineers and makers.
Dipole Antenna
Calculate the physical length, wavelength, gain, radiation resistance, and 50Ω VSWR for a half-wave dipole antenna at any frequency. Supports velocity factor for insulated wire.
Patch Antenna
Calculate rectangular microstrip patch antenna dimensions (width, length) using the Transmission Line Model. Outputs effective dielectric constant, edge-feed impedance, and nominal gain for common substrates like FR4 and Rogers.
EIRP / ERP
Calculate Effective Isotropic Radiated Power (EIRP) and ERP from transmit power, cable loss, and antenna gain. Check compliance against FCC, ETSI, and ISM-band regulatory limits.
Beamwidth
Calculate antenna 3dB beamwidth from gain, aperture efficiency, and frequency for aperture antennas
Yagi-Uda Antenna
Calculate Yagi-Uda antenna element dimensions, gain, and impedance for a given frequency and number of elements
Horn Antenna
Calculate pyramidal horn antenna gain, E-plane and H-plane half-power beamwidths, and effective aperture area for microwave applications
Parabolic Dish
Calculate parabolic dish antenna gain, half-power beamwidth (HPBW), effective aperture area, and noise temperature for satellite and microwave links
Loop Antenna
Calculate small loop antenna radiation resistance, loss resistance, gain, Q factor, and operating bandwidth for HF and VHF applications