A high frequency connection adapter , comprising a dielectric coupling sleeve for the capacitive coupling of a first electrical conductor to a second electrical conductor, wherein the second electrical conductor has a conductor cavity , comprising: a first sleeve section having a first diameter, wherein a receiving space closed on one side is formed in the first sleeve section into which the first electrical conductor is insertable; and a second sleeve section having a second diameter, wherein the second diameter is smaller than the first diameter, and wherein the second sleeve section is insertable into the conductor cavity , wherein the receiving space closed on one side extends at least partly into the second sleeve section , a first high frequency connector comprising a housing and a first inner conductor arranged in a receiving section of the housing , wherein the first inner conductor is inserted into the receiving space closed on one side of the first sleeve section and wherein the first sleeve section fills at least a portion of the receiving section ; a second high frequency connector having a second inner conductor , wherein the second inner conductor comprises a conductor cavity , into which the second sleeve section is inserted, wherein the second inner conductor has a first inner conductor section comprising the conductor cavity and a second inner conductor section , and a further housing and an isolating element , which galvanically isolates the second inner conductor section and the further housing , wherein the second sleeve section of the dielectric coupling sleeve is inserted into the conductor cavity , wherein the high frequency connection adapter further comprises an adapter housing and an empty space , wherein the further housing is pressed into the adapter housing . a first sleeve section having a first diameter, wherein a receiving space closed on one side is formed in the first sleeve section into which the first electrical conductor is insertable; and a second sleeve section having a second diameter, wherein the second diameter is smaller than the first diameter, and wherein the second sleeve section is insertable into the conductor cavity , wherein the receiving space closed on one side extends at least partly into the second sleeve section , a first high frequency connector comprising a housing and a first inner conductor arranged in a receiving section of the housing , wherein the first inner conductor is inserted into the receiving space closed on one side of the first sleeve section and wherein the first sleeve section fills at least a portion of the receiving section ; a second high frequency connector having a second inner conductor , wherein the second inner conductor comprises a conductor cavity , into which the second sleeve section is inserted, wherein the second inner conductor has a first inner conductor section comprising the conductor cavity and a second inner conductor section , and a further housing and an isolating element , which galvanically isolates the second inner conductor section and the further housing , wherein the second sleeve section of the dielectric coupling sleeve is inserted into the conductor cavity , wherein the high frequency connection adapter further comprises an adapter housing and an empty space , wherein the further housing is pressed into the adapter housing . <EOS>