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ALMA band 5 cartridge performance

Bhushan Billade (Institutionen för radio- och rymdvetenskap, Avancerad mottagarutveckling) ; Igor Lapkin (Institutionen för radio- och rymdvetenskap, Avancerad mottagarutveckling) ; Olle Nyström (Institutionen för radio- och rymdvetenskap, Avancerad mottagarutveckling) ; Erik Sundin (Institutionen för radio- och rymdvetenskap, Avancerad mottagarutveckling) ; Mathias Fredrixon (Institutionen för radio- och rymdvetenskap, Avancerad mottagarutveckling) ; R. Finger ; Hawal Rashid (Institutionen för radio- och rymdvetenskap, Avancerad mottagarutveckling) ; Vincent Desmaris (Institutionen för radio- och rymdvetenskap, Avancerad mottagarutveckling) ; Denis Meledin (Institutionen för radio- och rymdvetenskap, Avancerad mottagarutveckling) ; Alexey Pavolotsky (Institutionen för radio- och rymdvetenskap, Avancerad mottagarutveckling) ; Victor Belitsky (Institutionen för radio- och rymdvetenskap, Avancerad mottagarutveckling)
21st International Symposium on Space Terahertz Technology 2010, ISSTT 2010; Oxford; United Kingdom; 23 March 2010 through 25 March 2010 p. 112. (2010)
[Konferensbidrag, refereegranskat]

Work presented here concerns the design and performance of the ALMA Band 5 cold cartridge, one of the 10 frequency channels of ALMA project, a radio interferometer under construction at Atacama Desert in Chile. The Band 5 cartridge is a dual polarization receiver with the polarization separation performed by orthomode transducer (OMT) [1]. For each polarization, Band 5 receiver employs sideband rejection (2SB) scheme based on quadrature layout, with SIS mixers covering 163-211 GHz with 4-8 GHz IF. The LO injection circuitry is integrated with mixer chip and is implemented on the same substrate, resulting in a compact 2SB assembly. Amongst the other ALMA bands, the ALMA Band 5 being the lowest frequency band that uses all cold optics, has the largest mirror. Consequently, ALMA Band 5 mirror along with its support structure leaves very little room for placing OMT, mixers and IF subsystems. The constraints put by the size of cold optics and limited cartridge space, required of us to revise the original 2SB design and adopt a design where all the components like OMT, mixer, IF hybrid, isolators and IF amplifier are directly connected to each other without using any co-ax cables in-between. The IF subsystem uses the space between 4 K and 15 K stage of the cartridge and is thermally connected to 4 K stage. Avoiding co-ax cabling required use of custom designed IF hybrid, furthermore, due to limited cooling capacity at 4 K stage, resistive bias circuitry for the mixers is moved to 15 K stage and the IF hybrid along with an integrated bias-T is implemented using superconducting micro-strip lines. The E-probes for both LO and RF waveguide-to-microstrip transitions are placed perpendicular to the wave direction (back-piece configuration). The RF choke at the end of the probes provides a virtual ground for the RF/LO signal, and the choke is DC grounded to the chassis. The on-chip LO injection is done using a microstrip line directional coupler with slot-line branches in the ground plane. The isolated port of the LO coupler is terminated by floating wideband elliptical termination. The mixer employs two SIS junctions with junction area of 3 μm2 each, in twin junction configuration, followed by a quarter wave transformer to couple it to the signal probe. A quarter-wave high impedance line on an extra layer of SiO2 is used to extract the IF by separating from RF [2]. At the conference, we plan to present details of the cartridge design and results of the experimental characterization of the ALMA Band 5 cold cartridge.

Nyckelord: Experimental characterization, Frequency channels, Ortho-mode transducers, Polarization separation, Quarter Wave Transformer, Radio interferometers, Support structures, Waveguide-to-microstrip transition, Antennas, Design, Frequency bands, Microstrip lines, Mirrors, Mixers (machinery), Polarization, Probes, Semiconductor junctions, Projectiles



Denna post skapades 2016-05-12.
CPL Pubid: 236457

 

Institutioner (Chalmers)

Institutionen för radio- och rymdvetenskap, Avancerad mottagarutveckling (2005-2010)

Ämnesområden

Elektroteknik och elektronik

Chalmers infrastruktur