Leif Helldner
Leif Helldner graduated with advanced diploma in automation technology from Fässberg secondary school, Mölndal, Sweden in 1988, he have been employed at Chalmers University of Technology, Onsala Space Observatory, Onsala, Sweden since 1988, developing, installing and maintaining radiometers, receivers, antenna feeds, telescopes and back-end equipment, for both single-dish and VLBI operation, with deliverables to Onsala, SEST, APEX, ALMA, LOFAR, SKA, VLBI2010 and more… Leif have the Group for Advanced Receiver Development (GARD), Gothenburg, Sweden as his main workplace since 2019 with the position as Senior Research Engineer. His main expertise is mechanical and cryogenic design of radio astronomy receivers, test equipment and components, using mechanical CAD and simulation software, for further processing and manufacturing in-house or to external contractors, followed by integration, verification and testing.
Showing 49 publications
3D-Structured Polyethylene Windows for Low-Loss Transmission in Wideband Cryogenic Terahertz Systems
Wideband OMT for the 210-373 GHz Band With Built-in 90? Waveguide Twist
Microfabricated Waveguide Terminations for Wideband and Low-power THz Applications
Broadband Microfabricated Waveguide Terminations for Low-power Applications at Terahertz Frequencies
A Wideband RF and Wideband IF DSB SIS Mixer
A Broad-Band Dual-Polarization All-Metal Dichroic Filter for Cryogenic Applications in Sub-THz Range
Setup for Measurement and Characterization of Cryogenic Low-Noise Receivers
Wideband OMT with Modified Bøifot Layout and Co-aligned Waveguide Outputs
3D-Printed All-metal Wideband Dual-Polarization Cryogenic Dichroic Filters
Novel Orthomode Transducer Scalable to Terahertz Frequencies
Beyond-Decade Ultrawideband Quad-Ridge Flared Horn With Dielectric Load From 1 to 20 GHz
A broadband and dual-polarization single-layer dichroic filter for applications in Sub-THz range
Onsala Space Observatory – IVS Technology Development Center Activities during 2017–2018
Status of the Onsala Twin Telescopes – Two Years After the Inauguration
Sensitivity simulation and measurement of the SKA Band 1 wideband feed package on MeerKAT
Wideband single pixel feed system over 4.6-24 GHz for the Square Kilometre Array
Status of the Onsala Twin Telescopes – One Year After the Inauguration
Ultra-wideband feed systems for the EVN and SKA - evaluated for VGOS
Sensitivity and Antenna Noise Temperature Analysis of the Feed System for the Onsala Twin Telescopes
The Onsala Twin Telescopes Project
The Onsala Twin Telescopes: the Status at the Time for the Inauguration
A new 3 mm band receiver for the Onsala 20 m antenna
A Compact Dual-Polarized 4-Port Eleven Feed with High Sensitivity for Reflectors over 0.35-1.05 GHz
Onsala Space Observatory – IVS Technology Development Center Activities during 2014
Onsala Space Observatory – IVS Technology Development Center Activities during 2013
Dual Band MM-Wave Receiver for Onsala 20 m Antenna
Onsala Space Observatory – IVS Technology Development Center
Design and System Integration of 2-14 GHz Eleven Feed for VLBI2010
A circular Eleven feed with significantly improved aperture efficiency over 1.3-14 GHz
Development of the cryogenic 2-14 GHz eleven feed system for VLBI2010
Circular Eleven Feed with Significantly Improved BOR1 and Aperture Efficiency Over 1.3-14 GHz
Design of Compact Dual-Polarized 1.2–10 GHz Eleven Feed for Decade Bandwidth Radio Telescopes
Review of recent developments of the eleven feed for future decade bandwidth radio telescopes
Cryogenic 2-13 GHz Eleven feed for reflector antennas in future wideband radio telescopes
Onsala Space Observatory – IVS Technology Development Center
Cryogenic integration of 2-14 GHz Eleven Feed in wideband receiver for VLBI 2010
Design of cryogenic 2-14 GHz Eleven feed for reflector antennas for future radio telescopes
System noise calculations over the decade bandwidth of the Eleven feed
Onsala Space Observatory - IVS Technology Development Center
Cryogenic 2-14GHz low noise receiver for radio astronomy using Eleven feed
Developing a cooled 2-14 GHz Eleven feed for SKA and VLBI 2010
Onsala Space Observatory – IVS Technology Development Center
Development of a coolable 2-14 GHz Eleven feed for future radio telescopes for SKA and VLBI 2010
Electrical Design of a Cooled 2-14 GHz Eleven Feed for SKA and VLBI 2010
APEX - The Atacama Pathfinder Experiment
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