Radio frequency connection arrangement

A radio frequency transmission arrangement comprising:

• a ground plate having first and second opposite sides and an aperture formed in the ground plate and passing through the ground plate from the first side to the second side, the aperture comprising a slot, the slot having an elongated cross-section in a plane of the first side of the ground plate, the cross-section having substantially parallel sides extending along a length of the cross section, and the slot having a width which is a distance between the parallel sides of the cross-section of the slot;
• a first transmission line comprising a first elongated conductor disposed on the first side of the ground plate in a substantially parallel relationship with the first side of the ground plate, the first transmission line having an end terminated with a first termination stub;
• and
• a second transmission line comprising a second elongated conductor disposed on the second side of the ground plate in a substantially parallel relationship with the second side of the ground plate, the second transmission line having an end terminated with a second termination stub,
• wherein the first transmission line is arranged to cross the slot at a point adjacent to the first termination stub, and the second transmission line is arranged to cross the slot at a point adjacent to the second termination stub,
• wherein a thickness of the ground plate is greater than the width of the slot, and
• wherein the aperture formed in the ground plate is partially filled with a solid dielectric material in the ground plate and partially filled with air in the ground plate.