Antenna Catalog

Horn Antenna

A flared waveguide that radiates a clean, directive beam at microwave frequencies.

Slot Antenna

A narrow slot cut in a conducting sheet that radiates like a complementary dipole.

Collinear Array

Several in-line radiators stacked to squash the pattern toward the horizon.

Phased Array

Many elements whose feed phases steer and shape the beam electronically.

Turnstile Antenna

Two crossed dipoles fed in quadrature for circular or omnidirectional coverage.

ASR-11 Airport Surveillance Radar

A modern digital S-band terminal radar combining primary and secondary surveillance.

ASR-9 Airport Surveillance Radar

The rotating S-band primary radar that paints aircraft in the airspace around an airport.

ATC Tower VHF Communications Antenna

The omnidirectional vertical whips that carry voice between controllers and aircraft.

ILS Glideslope Antenna

A tower beside the runway that projects the correct descent angle using ground reflection.

ILS Localizer Array

A wide row of antennas past the runway end that defines the approach centerline.

Secondary Surveillance Radar (Mode-S Beacon)

The long flat 'hockey-stick' array atop the radar that interrogates aircraft transponders.

VOR Navigation Antenna

A ground beacon whose circular antenna array lets aircraft read their bearing from the station.

Biquad

Two square loops over a reflector—an easy, effective microwave beam.

🔧 Buildable at home

Cubical Quad

A beam built from full-wave loops instead of straight elements.

🔧 Buildable at home

Log-Periodic Dipole Array (LPDA)

A directional, extremely broadband array of progressively scaled dipoles.

Yagi-Uda

A directional array of a driven dipole with parasitic reflector and directors.

🔧 Buildable at home

Axial-Mode Helical

A coil of wire about a wavelength around that radiates a circularly polarized beam.

Normal-Mode Helical (Rubber Duck)

A short, coiled flexible antenna that fits a quarter-wave into a stubby package.

Full-Wave Loop

A loop one wavelength in circumference with gain and low noise.

🔧 Buildable at home

Small Transmitting (Magnetic) Loop

A compact tuned loop, far smaller than a wavelength, with sharp tuning and high efficiency.

🔧 Buildable at home

Microstrip Patch

A flat metal patch printed on a dielectric board that radiates broadside.

Planar Inverted-F Antenna (PIFA)

A folded, shorted patch that fits an efficient antenna into a tiny device.

Corner Reflector

A dipole in front of a V-shaped reflector for moderate, simple gain.

Parabolic Dish Reflector

A curved reflector that focuses a feed antenna into a very high-gain pencil beam.

Beverage Antenna

A long, low receiving wire prized for its quiet, directional low-band reception.

Rhombic Antenna

A large diamond of wire, terminated to give high-gain, single-direction radiation.

5/8-Wave Vertical

A taller-than-quarter-wave vertical that pushes more energy toward the horizon.

Discone

A disc-over-cone vertical with enormous bandwidth and an omnidirectional pattern.

Ground Plane Antenna

A quarter-wave vertical with radials that form an artificial ground.

🔧 Buildable at home

J-Pole

An end-fed half-wave vertical matched by a quarter-wave parallel stub.

🔧 Buildable at home

Quarter-Wave Monopole

A single vertical quarter-wavelength rod that works against a ground plane.

🔧 Buildable at home

Whip Antenna

A flexible rod monopole used on vehicles and portable radios.

Bowtie Antenna

A dipole with triangular flared elements for wideband, often UHF, use.

🔧 Buildable at home

End-Fed Half-Wave (EFHW)

A half-wave wire fed at its high-impedance end through a transformer.

🔧 Buildable at home

Folded Dipole

A dipole made from a closed loop of two parallel conductors for higher impedance and bandwidth.

🔧 Buildable at home

G5RV Multiband Dipole

A 102-foot doublet with a matching section that loads on several HF bands.

Half-Wave Dipole

The simplest resonant antenna: two straight conductors fed at the center.

🔧 Buildable at home

Inverted-V Dipole

A center-fed dipole with its ends sloping down from a single high support.

🔧 Buildable at home

Off-Center-Fed Dipole (Windom)

A dipole fed away from center to find an impedance common to several bands.