2022-03-022022-03-0219893-924651-19-1https://publica.fraunhofer.de/handle/publica/126766MIOP '89. Mikrowellen und Optronik. 4. Kongreßmesse für HochfrequenztechnikMIOP '89. Microwaves and Optronics. 4th Exhibition and Conference on High Frequency Engineering