Antenna Calculators

Convert between wavelength and frequency

Calculate SWR, Return Loss, Mismatch Loss

Calculate coaxial cable losses

Calculate coaxial cable impedance from geometry

Calculate XL, XC and LC resonant frequency

Calculate twin-lead transmission line impedance

Calculate conductor skin depth

Calculate first Fresnel zone radius

Calculate effective radiated power

Velocity/shortening factor from dielectric constant

Convert between dBm, Watts, and dBW

Series to parallel impedance conversion

Calculate safe distance from antenna

Calculate received signal level

Height effect on radiation angle

Resonant frequencies of a wire

Calculate half-wave dipole length by frequency

Folded dipole with Z ≈ 300 Ω

Multi-band G5RV antenna

Multi-band antenna with offset feed point

Multi-band end-fed antenna with open-wire feeder

Dual-band dipole with trap circuits

Tilted terminated folded dipole (wideband)

Multi-band fan dipole antenna

Dipole with loading coils

DL7AB multiband dipole antenna

End-fed half-wave antenna with 49:1 UnUn

Wideband coaxial sleeve dipole

V-shaped dipole with single center support

Stacked collinear wire antenna

Sterba curtain broadside array antenna

Calculate long wire antenna by number of half-waves

Directional rhombic antenna for DX communications

Directional V-shaped wire antenna

Terminated V-beam directional antenna

Bruce curtain antenna array

Directional receiving wave antenna

Compact directional receiving antenna

Terminated (closed) rhombic antenna

Calculate quarter-wave vertical antenna

Five-eighths wavelength vertical antenna with gain

J-shaped vertical antenna for VHF/UHF

Half-wave vertical dipole antenna

Inverted-L vertical wire antenna

Compact directional discontinuity ring radiator

Groundplane with traps for multiple bands

Coaxial collinear (Franklin) antenna

T-shaped vertical antenna with top loading

Helically wound shortened vertical

Dual-band vertical with trap

Shortened mobile whip antenna

Delta loop with capacitive tuning

Two-element Yagi-Uda directional antenna

Three-element Yagi-Uda antenna

Five-element Yagi-Uda beam antenna

Compact 2-element phased directional antenna

Bidirectional W8JK array antenna

Multi-element VHF Yagi (10+ el.)

Seven-element Yagi-Uda beam antenna

Two-element phased array (ZL-Special)

Three-band directional antenna

Compact directional Moxon antenna

Crossed-element directional beam antenna

VK2AOU compact shortened beam antenna

Delta-shaped loop antenna

Full-wave square loop antenna

Two-element quad beam antenna

Compact magnetic loop antenna for HF

Vertically polarized delta loop

Three-element cubical quad beam

DJ4VM multiband loop antenna

Ferrite rod loop antenna for receiving

Full-wave birdcage loop antenna

Three-band delta loop with switching stubs

Calculate quarter-wave transformer

Calculate L-type matching network

Calculate Pi-type matching network

Calculate gamma matching network

Single-stub impedance matching

Calculate broadband balun transformer

Calculate T-type matching network

Unbalanced impedance transformer

Omega impedance matching network

Half-wave coaxial balun stub

Vertical collinear antenna for VHF

Wideband discone antenna

Directional helix with circular polarization

Half-wave slot antenna

Antenna with corner reflector

Wideband log-periodic dipole array

Compact VHF/UHF vertical antenna

Wideband skeleton slot antenna

Horizontal polarization omnidirectional

Compact loop antenna for VHF

Circular polarization for satellites

Microstrip patch antenna

Yagi for 70cm band (432 MHz)

Stacked Yagi array for VHF/UHF

Double helical antenna with circular polarization

Helikon spiral antenna for VHF/UHF

Compact 4-6 element Yagi for 2m band

Quad-loop Yagi antenna for VHF

Phased stacked antenna array

Multi-element Yagi antenna for TV reception

Butterworth low-pass filter

Butterworth high-pass filter

LC bandpass filter

Band-reject (notch) filter

Coaxial stub filter (notch)

Pi-section low-pass filter for transmitter output

Coaxial transmission line low-pass filter