Apparatus for transferring signals from an at least partially metallic housing

An apparatus for transferring signals from an at least partially metallic housing with the aid of electromagnetic waves of a particular wavelength, the apparatus comprising:

• a transmitting/receiving unit for generating and receiving the electromagnetic waves, wherein the transmitting/receiving unit is arranged in the housing;
• a primary antenna for coupling out the generated electromagnetic waves of the transmitting/receiving unit and for coupling in and transferring received electromagnetic waves to the transmitting/receiving unit, wherein the primary antenna is arranged in the housing;
• and
• at least one slot-shaped housing opening that is constructed such that a length of the at least one slot-shaped housing opening corresponds to an integer multiple of a quarter wavelength of the particular wavelength so that the at least one slot-shaped housing opening, in cooperation with the primary antenna, transfers the signals into or out of the housing with the aid of electromagnetic waves.

A field device adapter for wireless data transmission, comprising:

• an apparatus, including:
• a partially metallic housing;
• a transmitting/receiving unit for generating and receiving the electromagnetic waves, wherein the transmitting/receiving unit is arranged in the housing;
• a primary antenna for coupling out the generated electromagnetic waves of the transmitting/receiving unit and for coupling in and transferring received electromagnetic waves to the transmitting/receiving unit, wherein the primary antenna is arranged in the housing;
• and
• at least one slot-shaped housing opening that is constructed such that a length of the at least one slot-shaped housing opening corresponds to an integer multiple of a quarter wavelength of the particular wavelength so that the at least one slot-shaped housing opening, in cooperation with the primary antenna, transfers the signals into or out of the housing with the aid of electromagnetic waves;
• and
• an adapter housing,
• wherein the adapter housing of the field device adapter comprises the apparatus housing.

An automation technology field device comprising:

• an apparatus, including:
• a partially metallic housing;
• a transmitting/receiving unit for generating and receiving the electromagnetic waves, wherein the transmitting/receiving unit is arranged in the housing;
• a primary antenna for coupling out the generated electromagnetic waves of the transmitting/receiving unit and for coupling in and transferring received electromagnetic waves to the transmitting/receiving unit, wherein the primary antenna is arranged in the housing;
• and
• at least one slot-shaped housing opening that is constructed such that a length of the at least one slot-shaped housing opening corresponds to an integer multiple of a quarter wavelength of the particular wavelength so that the at least one slot-shaped housing opening, in cooperation with the primary antenna, transfers the signals into or out of the housing with the aid of electromagnetic waves;
• and
• a field device housing,
• wherein the field device housing of the field device comprises the apparatus housing, at least in one section.