Leif Helldner

Senior Research Engineer at Onsala Space Observatory

Leif is involved in the development, integration, testing and maintenance of the radiometers, receivers and antenna systems with surrounding equipment for radio astronomy at Onsala Space Observatory, and has also participated in the development of systems for other projects like SEST, APEX, ALMA, LOFAR, SKA and VLBI2010.

He has a long and extensive knowledge in the development of systems for cryo & vacuum technology, radiometer technology and VLBI technique, he works closely with partners from other universities & institutions and industry, both nationally and internationally.

Source: chalmers.se

Contact Details ORCID

Publications (40)
Projects (0)

Showing 40 publications

2024

A Broad-Band Dual-Polarization All-Metal Dichroic Filter for Cryogenic Applications in Sub-THz Range

Daniel Montofre, Denis Meledin, Cristian Daniel López et al

IEEE Transactions on Terahertz Science and Technology. Vol. 14 (2)

Journal article

2023

Beyond-Decade Ultrawideband Quad-Ridge Flared Horn With Dielectric Load From 1 to 20 GHz

Jonas Flygare, Jian Yang, Alexander W. Pollak et al

IEEE Transactions on Antennas and Propagation. Vol. 71 (3), p. 2110-2125

Journal article

2022

A broadband and dual-polarization single-layer dichroic filter for applications in Sub-THz range

Daniel Montofre, Igor Lapkin, Denis Meledin et al

32nd International Symposium of Space Terahertz Technology, ISSTT 2022

Paper in proceeding

2020

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

Rüdiger Haas, Gunnar Elgered, Leif Helldner et al

Report - NASA Goddard Space Flight Center

Show project

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 in proceeding

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 in 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 in 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 in 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 in proceeding

2018

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

Jonas Flygare, Miroslav Pantaleev, John Conway et al

Other conference contribution

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

Other conference contribution

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

Conference poster

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

Other conference contribution

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

Other conference contribution

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

Journal article

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

Book chapter

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

Journal article

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

Book chapter

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 in 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

Book chapter

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

Journal article

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

Conference poster

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 in proceeding

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 in proceeding

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

Conference poster

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

Journal article

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 in 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 in 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

Journal article

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

Book chapter

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

Other conference contribution

2010

Onsala Space Observatory - IVS Technology Development Center

Rüdiger Haas, Miroslav Pantaleev, Leif Helldner et al

IVS 2009 Annual Report, p. 304-307

Magazine article

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 in proceeding

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 in proceeding

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

Other conference contribution

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 in 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

Magazine article

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 in 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 in proceeding

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 I

Paper in proceeding

Download publication list

You can download this list to your computer.

Filter and download publication list

As logged in user (Chalmers employee) you find more export functions in MyResearch.

You may also import these directly to Zotero or Mendeley by using a browser plugin. These are found herer:

Zotero Connector
Mendeley Web Importer

The service SwePub offers export of contents from Research in other formats, such as Harvard and Oxford in .RIS, BibTex and RefWorks format.

There are no projects.

There might be more projects where Leif Helldner participates, but you have to be logged in as a Chalmers employee to see them.