Patent ID: 7471254

Claim:
A triplate planar slot antenna comprising: a ground plate; a lower side dielectric layer; a lower side copper clad film substrate; an upper side dielectric layer; a slot plate; and an upper side copper clad film substrate, wherein said triplate planar slot antenna is formed by successively laminating, starting from a bottom side thereof, said ground plate, said lower side dielectric layer, said lower side copper clad film substrate, said upper side dielectric layer, said slot plate and said upper side copper clad film substrate, wherein said lower side copper clad film substrate comprises a lower side insulating film and a lower side copper foil piece fixed onto a surface of said lower side insulating film by adhesiveless bonding, wherein said upper side copper clad film substrate comprises an upper side insulating film and an upper side copper foil piece fixed onto a surface of said upper side insulating film by adhesiveless bonding, and wherein each of said insulating films from which only said copper foil pieces have been removed has, within a working frequency thereof, a relative permittivity ranging from 2.0 to 4.0, and a dielectric loss tangent ranging from 0.001 to 0.01.