Montisci, G.G.MontisciValente, GiuseppeGiuseppeValenteMuntoni, G.G.MuntoniMarongiu, P.P.MarongiuPisanu, T.T.Pisanu2024-04-032024-04-032021-10-18https://hdl.handle.net/20.500.13025/6335We present the design of a thermal isolator, based on a simple gap in a standard rectangular waveguide with external circular profile. The proposed solution allows to achieve high return loss and low insertion loss by a suitable selection of the of the external radius of the waveguide circular profile, which determines the waveguide wall thickness. High robustness to misalignment is obtained, improving the performance of a recently published work in the same topic. © 2021 URSI.enconference paper10.23919/URSIGASS51995.2021.9560237https://ieeexplore.ieee.org/document/9560237