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 48 publikationer
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
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
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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