Exploring boundaries for wider RF and wider IF bands for ALMA SIS receivers

Group for Advanced Receiver Development (GARD) at Chalmers University actively participates in development of instrumentation for ALMA, e.g., ALMA Band 5 and, recently, ALMA Band 2. GARD involved in the ESO supported ALMA Development Study, by running project ``ALMA Band 6 and 7 Cold Cartridge Demonstrator''. We would like to present recent progress of this project work towards SIS mixer receiver covering 210-375 GHz RF band and having 4-20 GHz IF band. We plan to present results of development and tests of various components for such receiver. We show the results on the development of wideband optics and corrugated feed for such broadband receiver that has key importance as it would ensure feasibility of such receiver effective coupling to the antenna. We will present results of the development of the broadband OMT that is known using single feed for both polarizations and providing superior beam alignment on sky between the two polarization in the ALMA receivers as compared to polarizing grids. We will show results of the development of the 2SB mixer components and measurement results of the DSB mixer chip. Finally, we will present proposed 3D CAD model for such receiver in the ALMA cartridge environment.