Leif Helldner
Leif arbetar med utveckling, integration, tester och underhåll av Observatoriets radiometrar, mottagare och antennsystem med kringutrustning för radioastronomi vid Onsala Rymdobservatorium, och har även medverkat i utveckling av system för andra projekt som SEST, APEX, ALMA, LOFAR, SKA och VLBI2010.
Han har en lång och gedigen kunskap inom utveckling av system för cryo & vakuum teknik, radiometerteknik samt VLBI teknik och har ett nära samarbete med partners från industri samt andra högskolor och institutioner, både nationellt och internationellt.
Visar 40 publikationer
A Broad-Band Dual-Polarization All-Metal Dichroic Filter for Cryogenic Applications in Sub-THz Range
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
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
Status of the Onsala Twin Telescopes – Two Years 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
Onsala Space Observatory – IVS Technology Development Center Activities during 2014
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 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
Development of the cryogenic 2-14 GHz eleven feed system for VLBI2010
A circular Eleven feed with significantly improved aperture efficiency over 1.3-14 GHz
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
Onsala Space Observatory - IVS Technology Development Center
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
Cryogenic 2-14GHz low noise receiver for radio astronomy using Eleven feed
Development of a coolable 2-14 GHz Eleven feed for future radio telescopes for SKA and VLBI 2010
Onsala Space Observatory – IVS Technology Development Center
Developing a cooled 2-14 GHz Eleven feed 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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