Leif Helldner

Senior forskningsingenjör vid Onsala rymdobservatorium

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.

Källa: chalmers.se

Kontaktuppgifter ORCID

Publikationer (37)
Projekt (0)

Visar 37 publikationer

2020

Onsala Space Observatory – IVS Technology Development Center Activities during 2017–2018

Rüdiger Haas, Gunnar Elgered, Leif Helldner et al

Rapport - NASA Goddard Space Flight Center

Visa projekt

2019

Wideband single pixel feed system over 4.6-24 GHz for the Square Kilometre Array

Jonas Flygare, Bin Dong, Jian Yang et al

Proceedings of the 2019 21st International Conference on Electromagnetics in Advanced Applications, ICEAA 2019, p. 630-635

Paper i proceeding

2019

Status of the Onsala Twin Telescopes – One Year After the Inauguration

Rüdiger Haas, Simon Casey, Gunnar Elgered et al

IVS 2018 General Meeting Proceedings "Global Geodesy and the Role of VGOS – Fundamental to Sustainable Development". Vol. NASA/CP-2019-219039, p. 17-19

Paper i proceeding

2019

Status of the Onsala Twin Telescopes – Two Years After the Inauguration

Rüdiger Haas, Simon Casey, John Conway et al

Proceedings of the 24th European VLBI Group for Geodesy and Astrometry Working Meeting, p. 5-9

Paper i proceeding

2019

Sensitivity simulation and measurement of the SKA Band 1 wideband feed package on MeerKAT

Jonas Flygare, Adriaan Peens-Hough, Leif Helldner et al

13th European Conference on Antennas and Propagation, EuCAP 2019. Vol. EuCAP 2019

Paper i proceeding

2018

Optical design and verification of the 4mm receiver for the 20m telescope at Onsala Space Observatory

G. W. Walker, E. Kalinauskaite, D. McCarthy et al

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 10015

Paper i proceeding

2018

Ultra-wideband feed systems for the EVN and SKA - evaluated for VGOS

Jonas Flygare, Miroslav Pantaleev, John Conway et al

Övrigt konferensbidrag

2017

Sensitivity and Antenna Noise Temperature Analysis of the Feed System for the Onsala Twin Telescopes

Jonas Flygare, Miroslav Pantaleev, Bhushan Billade et al

Proceedings of the 23rd European Very Long Baseline Interferometry Group for Geodesy and Astrometry Working Meeting, EVGA2017, Gothenburg, Sweden, 15-19 May 2017, p. 10-14

Övrigt konferensbidrag

2017

Design, Implementation and Tests of the Signal Chain for the Twin Telescopes at Onsala Space Observatory

Miroslav Pantaleev, Leif Helldner, Rüdiger Haas et al

Proceedings of the 23rd European VLBI Group for Geodesy and Astrometry Working Meeting, p. 15-19

Övrigt konferensbidrag

2017

The Onsala Twin Telescopes Project

Gunnar Elgered, Rüdiger Haas, John Conway et al

The 23rd Working Meeting of the European VLBI Group for Geodesy and Astrometry (EVGA), Gothenburg, May 14–18, 2017

Poster (konferens)

2017

The Onsala Twin Telescopes: the Status at the Time for the Inauguration

Gunnar Elgered, Rüdiger Haas, John Conway et al

Proceedings of the 23rd European VLBI Group for Geodesy and Astrometry Working Meeting, p. 136-139

Övrigt konferensbidrag

2015

Onsala Space Observatory – IVS Technology Development Center Activities during 2014

Miroslav Pantaleev, Rüdiger Haas, Bhushan Billade et al

International VLBI Service for Geodesy and Astrometry 2014 Annual Report, p. 300-303

Kapitel i bok

2015

A new 3 mm band receiver for the Onsala 20 m antenna

Victor Belitsky, Igor Lapkin, Mathias Fredrixon et al

Astronomy and Astrophysics. Vol. 580

Artikel i vetenskaplig tidskrift

2015

A Compact Dual-Polarized 4-Port Eleven Feed with High Sensitivity for Reflectors over 0.35-1.05 GHz

Jian Yang, Miroslav Pantaleev, Bhushan Billade et al

IEEE Transactions on Antennas and Propagation. Vol. 63 (12), p. 5955-5960

Artikel i vetenskaplig tidskrift

2014

Onsala Space Observatory – IVS Technology Development Center Activities during 2013

Miroslav Pantaleev, Rüdiger Haas, Bhushan Billade et al

International VLBI Service for Geodesy and Astrometry 2013 Annual Report, edited by K. D. Baver, D. Behrend, and K. L. Armstrong, NASA/TP-2014-217522, 2014., p. 349-352

Kapitel i bok

2014

Dual Band MM-Wave Receiver for Onsala 20 m Antenna

Igor Lapkin, Mathias Fredrixon, Erik Sundin et al

Proceedings of the TWENTY-FIFTH INTERNATIONAL SYMPOSIUM ON SPACE TERAHERTZ TECHNOLOGY, April 27-30, 2014, Moscow, Russia, p. 132-

Paper i proceeding

2013

Onsala Space Observatory – IVS Technology Development Center

Miroslav Pantaleev, Ulf Kylenfall, Leif Helldner et al

International VLBI Service for Geodesy and Astrometry 2012 Annual Report, p. 346-349

Kapitel i bok

2013

The Circular Eleven Antenna: A New Decade-Bandwidth Feed for Reflector Antennas With High Aperture Efficiency

J. G. Yin, Jian Yang, Miroslav Pantaleev et al

IEEE Transactions on Antennas and Propagation. Vol. 61 (8), p. 3976-3984

Artikel i vetenskaplig tidskrift

2012

Design of Compact Dual-Polarized 1.2–10 GHz Eleven Feed for Decade Bandwidth Radio Telescopes

Jian Yang, Miroslav Pantaleev, Per-Simon Kildal et al

IEEE Transactions on Antennas and Propagation. Vol. 60 (5), p. 2210-2218

Artikel i vetenskaplig tidskrift

2012

Design and System Integration of 2-14 GHz Eleven Feed for VLBI2010

Miroslav Pantaleev, Jian Yang, T. Ekebrand et al

Swedish Radio and Microwave Days 2012, RVK2012, Stockholm, 4-8 March 2012

Poster (konferens)

2012

Circular Eleven Feed with Significantly Improved BOR1 and Aperture Efficiency Over 1.3-14 GHz

J. Yin, Jian Yang, Miroslav Pantaleev et al

Swedish Radio and Microwave Days 2012, AntennEMB2012, Stockholm, 4-8 March 2012

Poster (konferens)

2012

A circular Eleven feed with significantly improved aperture efficiency over 1.3-14 GHz

J. Yin, Jian Yang, Miroslav Pantaleev et al

Proceedings of 6th European Conference on Antennas and Propagation, EuCAP 2012. Prague, 26-30 March 2012, p. 2353-2356

Paper i proceeding

2012

Development of the cryogenic 2-14 GHz eleven feed system for VLBI2010

Jian Yang, Miroslav Pantaleev, T. Ekebrand et al

6th European Conference on Antennas and Propagation, EuCAP 2012; Prague; Czech Republic; 26 March 2012 through 30 March 2012, p. 621-625

Paper i proceeding

2011

Review of recent developments of the eleven feed for future decade bandwidth radio telescopes

Jian Yang, Miroslav Pantaleev, Per-Simon Kildal et al

30th URSI General Assembly and Scientific Symposium, URSIGASS 2011, Istanbul, 13-20 August 2011, p. Art. no. 6051291-

Paper i proceeding

2011

Cryogenic 2-13 GHz Eleven feed for reflector antennas in future wideband radio telescopes

Jian Yang, Miroslav Pantaleev, Per-Simon Kildal et al

IEEE Transactions on Antennas and Propagation. Vol. 59 (6), p. 1918-1934

Artikel i vetenskaplig tidskrift

2011

Compact dual-polarized 1.2 - 10 GHz eleven feed by folding outer elements for large decade-bandwidth radio telescopes

Jian Yang, Miroslav Pantaleev, Per-Simon Kildal et al

IEEE Antennas and Propagation Society, AP-S International Symposium (Digest), p. 843-846

Paper i proceeding

2011

Onsala Space Observatory – IVS Technology Development Center

Miroslav Pantaleev, Rüdiger Haas, Leif Helldner et al

International VLBI Service for Geodesy and Astrometry 2010 Annual Report, edited by D. Behrend and K.Baver (NASA/TP-2011-215880), p. 280-283

Kapitel i bok

2010

Design of cryogenic 2-14 GHz Eleven feed for reflector antennas for future radio telescopes

Jian Yang, Miroslav Pantaleev, Per-Simon Kildal et al

Gigahertz Symposium 2010, Lund University, 9-10 March 2010

Paper i proceeding

2010

Onsala Space Observatory - IVS Technology Development Center

Rüdiger Haas, Miroslav Pantaleev, Leif Helldner et al

IVS 2009 Annual Report, p. 304-307

Artikel i övrig tidskrift

2010

Cryogenic 2-14GHz low noise receiver for radio astronomy using Eleven feed

Miroslav Pantaleev, Jian Yang, Per-Simon Kildal et al

Gigahertz Symposium 2010, Lund University, 9-10 March 2010

Övrigt konferensbidrag

2010

Cryogenic integration of 2-14 GHz Eleven Feed in wideband receiver for VLBI 2010

Miroslav Pantaleev, Jian Yang, Yogesh Karandikar et al

Sixth IVS General Meeting (International VLBI Service for Geodesy and Astrometry), February 7-13, 2010, Hobart, TAS, Australia, p. 415-419

Övrigt konferensbidrag

2010

System noise calculations over the decade bandwidth of the Eleven feed

Benjamin Klein, Per-Simon Kildal, Jian Yang et al

International Workshop on Phased Array Antenna Systems for Radio As-tronomy, Brigham Young University, Provo, UT USA, May 3-5, 2010

Paper i proceeding

2009

Developing a cooled 2-14 GHz Eleven feed for SKA and VLBI 2010

Per-Simon Kildal, Jian Yang, Yogesh Karandikar et al

URSI National Radio Science Meeting, Charleston, USA, 1-5 June 2009

Paper i proceeding

2009

Electrical Design of a Cooled 2-14 GHz Eleven Feed for SKA and VLBI 2010

Per-Simon Kildal, Jian Yang, Yogesh Karandikar et al

IVS VLBI2010 Workshop on Future Radio Frequencies and Feeds (FRFF), March 18 - 21, 2009, Wettzell, Germany

Paper i proceeding

2009

Development of a coolable 2-14 GHz Eleven feed for future radio telescopes for SKA and VLBI 2010

Per-Simon Kildal, Jian Yang, Yogesh Karandikar et al

International Conference on Electromagnetics in Advanced Applications (ICEAA 2009), Torino, Italy, September 14-18, 2009. Vol. 1-2, p. 522-524

Paper i proceeding

2009

Onsala Space Observatory – IVS Technology Development Center

Rüdiger Haas, Leif Helldner, Miroslav Pantaleev et al

In: International VLBI Service for Geodesy and Astrometry 2008 Annual Report, edited by D. Behrend and K. Baver. Vol. NASA/TP-2009-214183, 2009, p. 329-332

Artikel i övrig tidskrift

2006

APEX: the Atacama Pathfinder EXperiment

R. Güsten, Roy Booth, C. Cesarsky et al

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 6267

Övrigt konferensbidrag

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