Leif Helldner

Senior forskningsingenjör vid Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium, Elektroniklaboratorium

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

Visar 34 publikationer

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

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

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

Jonas Flygare, Miroslav Pantaleev, John Conway et al
Konferensbidrag (offentliggjort, men ej förlagsutgivet)
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
Konferensbidrag (offentliggjort, men ej förlagsutgivet)
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
Konferensbidrag (offentliggjort, men ej förlagsutgivet)
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
Konferensbidrag (offentliggjort, men ej förlagsutgivet)
2016

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. 9914 (Part 1), p. UNSP 99142V-
Paper i proceeding
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 övriga tidskrifter
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
Konferensbidrag (offentliggjort, men ej förlagsutgivet)
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
Konferensbidrag (offentliggjort, men ej förlagsutgivet)
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 övriga tidskrifter
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
Konferensbidrag (offentliggjort, men ej förlagsutgivet)

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