Flat-Panel Grid Antenna. R Struzak. This antenna offers ~18 dBi gain, VSWR <1.5, and bandwidth ~10%
Schematic diagram of the radiating grid. The array is fed at one point (marked by a circle) by a 50 ohm coaxial cable. Its inner conductor traverses the ground plane through a hole. The outer conductor is bounded to the ground plane.
Dielectric cover (foam)
Dielectric substrate (foam)
The supporting metal sheet (ground plane).
The coaxial cable and the fixture are not hown. The fold along 2 sides is to assure a rigidity.
Note: fixtures are not shown
1x metal sheet ~81x~67cm (could be simulated by a cardboard plate covered by a thin copper foil)
2x thermo-isolation foam plate 75x60x2.5cm
1x quality coaxial cable (or connector)
3.5m copper wire 1mm (or copper tape)
Cost: ~10-20 euro (material, except fixation & cable/ connector) + cost of ~1 hour work