The plane wave spectrum of an aperture antenna can be calculated from a complex measurement of th... more The plane wave spectrum of an aperture antenna can be calculated from a complex measurement of the radiated near- or far-field and it facilitates antenna diagnostics for the extreme near-field of the antenna. While antenna diagnostics often concerns the magnitude of the co-polar field, the plane wave spectrum actually allows for determination of both magnitude and phase of all three components of the electric as well as the magnetic field - and thus also the Poynting vector. In this work we focus on the Poynting vector and thus the power flow in the extreme near-field; as an example we employ a 60 GHz standard gain horn. Measurements obtained with a planar near-field antenna measurement set-up reveal that the power flow has not only a normal component - but also tangential components - in the aperture and, furthermore, that these components possess oscillations along the E-plane. We show that these oscillations are not merely a “Gibbs-like” phenomenon due to the availability of only the visible region of the plane wave spectrum and they are not caused by multiple reflections between the horn and the near-field probe - but resulted from the interference between the direct field and the edge-diffracted fields in the horn aperture. An analytical model based on the Geometrical Theory of Diffraction is established, and it is demonstrated that this model qualitatively as well as quantitatively predicts the measurement results for the power flow. A full-wave analysis is carried out and the simulation results show qualitatively the intricate physical mechanism of the power flow distribution.
In this work we extend the validation of this 60 GHz planar near-field (PNF) setup to antenna dia... more In this work we extend the validation of this 60 GHz planar near-field (PNF) setup to antenna diagnostics and perform a detailed systematic study of the extreme near-field of a standard gain horn at 60GHz from planar and spherical near-field measurement data. The magnitude and phase of all three rectangular components of the electric and the magnetic aperture fields are calculated, as is the main component of the Poynting vector showing the power flow over the aperture. While the magnitude of the co-polar electricfield may seem the obvious object for antenna diagnostics, we demonstrate that there is much additional information in those additional quantities that combine to give the full picture of the aperture field. The usefulness of the complete informationis illustrated on example where the horn aperture is disturbed by a fault. We compare the results of the planar and sphericalnear-field (SNF) measurements to each other and to simulation results.
Dual-polarized probe systems can be used with some of the advantages: the two electric field comp... more Dual-polarized probe systems can be used with some of the advantages: the two electric field components are simultaneously measured within a single scan, amplitude and phase drift affects the two polarization components in the same way, and there is no need for mechanical rotation of the probe. In this work we design and test a dual-polarized probe system at 60 GHz-a conical horn, including the elements: SPDT (single pole double throw) switch, an OMT (orthomode transducer) both components with 40 dB isolation-a square to circular transition (3.75 mm to 3.58 mm), cables and two coaxial to waveguide adapters up to 67 GHz for OMT-switch connection. A 27 dBi gain conical horn is designed by using WIPL-D software and in-house manufactured. The 60 GHz probe system is being assembled and tested in planar near-field (PNF) setup at DTU. The results are validated by comparison with WIPL-D simulations, showing a good agreement within the validity region, down to-30 dB pattern levels. Channel balance is carried out to compensate for the amplitude and phase differences between the signals at the OMT ports.
Users may download and print one copy of any publication from the public portal for the purpose... more Users may download and print one copy of any publication from the public portal for the purpose of private study or research. You may not further distribute the material or use it for any profit-making activity or commercial gain You may freely distribute the URL identifying the publication in the public portal If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.
External Frequency Conversion DTU Orbit (09/12/2018) 60 GHz Antenna Diagnostics from Planar Near ... more External Frequency Conversion DTU Orbit (09/12/2018) 60 GHz Antenna Diagnostics from Planar Near Field Antenna Measurement Without External Frequency Conversion We previously demonstrated that 60 GHz planarnear-field antenna measurements without external frequency conversion can provide far-field radiation patterns in good agreement with spherical near-field antenna measurements in spite of thecable flexing and thermal drift effects [P.I.Popa, S. Pivnenko,J.M. Nielsen, O. Breinbjerg, 60 GHz Antenna Measurement Setup using a VNA without External Frequency Conversion,36th Annual Symposium of the Antenna Measurement Technique Association ,October 12-17,Tucson, Arizona, 2014]. In this work we extend the validation of this 60 GHz planar near-field (PNF) set-up to antenna diagnostics and perform a detailed systematic study of the extreme near-field of a standard gain horn at 60GHz from planar and spherical near-field measurement data. The magnitude and phase of all three rectangular compo...
2016 10th European Conference on Antennas and Propagation (EuCAP), 2016
The plane wave spectrum of an aperture antenna can be calculated from a complex measurement of th... more The plane wave spectrum of an aperture antenna can be calculated from a complex measurement of the radiated near- or far-field and it facilitates antenna diagnostics for the extreme near-field of the antenna. While antenna diagnostics often concerns the magnitude of the co-polar field, the plane wave spectrum actually allows for determination of both magnitude and phase of all three components of the electric as well as the magnetic field - and thus also the Poynting vector. In this work we focus on the Poynting vector and thus the power flow in the extreme near-field; as an example we employ a 60 GHz standard gain horn. Measurements obtained with a planar near-field antenna measurement set-up reveal that the power flow has not only a normal component - but also tangential components - in the aperture and, furthermore, that these components possess oscillations along the E-plane. We show that these oscillations are not merely a “Gibbs-like” phenomenon due to the availability of only the visible region of the plane wave spectrum and they are not caused by multiple reflections between the horn and the near-field probe - but resulted from the interference between the direct field and the edge-diffracted fields in the horn aperture. An analytical model based on the Geometrical Theory of Diffraction is established, and it is demonstrated that this model qualitatively as well as quantitatively predicts the measurement results for the power flow. A full-wave analysis is carried out and the simulation results show qualitatively the intricate physical mechanism of the power flow distribution.
Dual-polarized probe systems can be used with some of the advantages: the two electric field comp... more Dual-polarized probe systems can be used with some of the advantages: the two electric field components are simultaneously measured within a single scan, amplitude and phase drift affects the two polarization components in the same way, and there is no need for mechanical rotation of the probe. In this work we design and test a dual-polarized probe system at 60 GHz a conical horn, including the elements: SPDT (single pole double throw) switch, an OMT (orthomode transducer) both components with 40 dB isolation a square to circular transition (3.75 mm to 3.58 mm), cables and two coaxial to waveguide adapters up to 67 GHz for OMT-switch connection. A 27 dBi gain conical horn is designed by using WIPL-D software and in-house manufactured. The 60 GHz probe system is being assembled and tested in planar near-field (PNF) setup at DTU. The results are validated by comparison with WIPL-D simulations, showing a good agreement within the validity region, down to -30 dB pattern levels. Channel ...
Users may download and print one copy of any publication from the public portal for the purpose... more Users may download and print one copy of any publication from the public portal for the purpose of private study or research. You may not further distribute the material or use it for any profit-making activity or commercial gain You may freely distribute the URL identifying the publication in the public portal If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.
The plane wave spectrum of an aperture antenna can be calculated from a complex measurement of th... more The plane wave spectrum of an aperture antenna can be calculated from a complex measurement of the radiated near- or far-field and it facilitates antenna diagnostics for the extreme near-field of the antenna. While antenna diagnostics often concerns the magnitude of the co-polar field, the plane wave spectrum actually allows for determination of both magnitude and phase of all three components of the electric as well as the magnetic field - and thus also the Poynting vector. In this work we focus on the Poynting vector and thus the power flow in the extreme near-field; as an example we employ a 60 GHz standard gain horn. Measurements obtained with a planar near-field antenna measurement set-up reveal that the power flow has not only a normal component - but also tangential components - in the aperture and, furthermore, that these components possess oscillations along the E-plane. We show that these oscillations are not merely a “Gibbs-like” phenomenon due to the availability of only the visible region of the plane wave spectrum and they are not caused by multiple reflections between the horn and the near-field probe - but resulted from the interference between the direct field and the edge-diffracted fields in the horn aperture. An analytical model based on the Geometrical Theory of Diffraction is established, and it is demonstrated that this model qualitatively as well as quantitatively predicts the measurement results for the power flow. A full-wave analysis is carried out and the simulation results show qualitatively the intricate physical mechanism of the power flow distribution.
In this work we extend the validation of this 60 GHz planar near-field (PNF) setup to antenna dia... more In this work we extend the validation of this 60 GHz planar near-field (PNF) setup to antenna diagnostics and perform a detailed systematic study of the extreme near-field of a standard gain horn at 60GHz from planar and spherical near-field measurement data. The magnitude and phase of all three rectangular components of the electric and the magnetic aperture fields are calculated, as is the main component of the Poynting vector showing the power flow over the aperture. While the magnitude of the co-polar electricfield may seem the obvious object for antenna diagnostics, we demonstrate that there is much additional information in those additional quantities that combine to give the full picture of the aperture field. The usefulness of the complete informationis illustrated on example where the horn aperture is disturbed by a fault. We compare the results of the planar and sphericalnear-field (SNF) measurements to each other and to simulation results.
Dual-polarized probe systems can be used with some of the advantages: the two electric field comp... more Dual-polarized probe systems can be used with some of the advantages: the two electric field components are simultaneously measured within a single scan, amplitude and phase drift affects the two polarization components in the same way, and there is no need for mechanical rotation of the probe. In this work we design and test a dual-polarized probe system at 60 GHz-a conical horn, including the elements: SPDT (single pole double throw) switch, an OMT (orthomode transducer) both components with 40 dB isolation-a square to circular transition (3.75 mm to 3.58 mm), cables and two coaxial to waveguide adapters up to 67 GHz for OMT-switch connection. A 27 dBi gain conical horn is designed by using WIPL-D software and in-house manufactured. The 60 GHz probe system is being assembled and tested in planar near-field (PNF) setup at DTU. The results are validated by comparison with WIPL-D simulations, showing a good agreement within the validity region, down to-30 dB pattern levels. Channel balance is carried out to compensate for the amplitude and phase differences between the signals at the OMT ports.
Users may download and print one copy of any publication from the public portal for the purpose... more Users may download and print one copy of any publication from the public portal for the purpose of private study or research. You may not further distribute the material or use it for any profit-making activity or commercial gain You may freely distribute the URL identifying the publication in the public portal If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.
External Frequency Conversion DTU Orbit (09/12/2018) 60 GHz Antenna Diagnostics from Planar Near ... more External Frequency Conversion DTU Orbit (09/12/2018) 60 GHz Antenna Diagnostics from Planar Near Field Antenna Measurement Without External Frequency Conversion We previously demonstrated that 60 GHz planarnear-field antenna measurements without external frequency conversion can provide far-field radiation patterns in good agreement with spherical near-field antenna measurements in spite of thecable flexing and thermal drift effects [P.I.Popa, S. Pivnenko,J.M. Nielsen, O. Breinbjerg, 60 GHz Antenna Measurement Setup using a VNA without External Frequency Conversion,36th Annual Symposium of the Antenna Measurement Technique Association ,October 12-17,Tucson, Arizona, 2014]. In this work we extend the validation of this 60 GHz planar near-field (PNF) set-up to antenna diagnostics and perform a detailed systematic study of the extreme near-field of a standard gain horn at 60GHz from planar and spherical near-field measurement data. The magnitude and phase of all three rectangular compo...
2016 10th European Conference on Antennas and Propagation (EuCAP), 2016
The plane wave spectrum of an aperture antenna can be calculated from a complex measurement of th... more The plane wave spectrum of an aperture antenna can be calculated from a complex measurement of the radiated near- or far-field and it facilitates antenna diagnostics for the extreme near-field of the antenna. While antenna diagnostics often concerns the magnitude of the co-polar field, the plane wave spectrum actually allows for determination of both magnitude and phase of all three components of the electric as well as the magnetic field - and thus also the Poynting vector. In this work we focus on the Poynting vector and thus the power flow in the extreme near-field; as an example we employ a 60 GHz standard gain horn. Measurements obtained with a planar near-field antenna measurement set-up reveal that the power flow has not only a normal component - but also tangential components - in the aperture and, furthermore, that these components possess oscillations along the E-plane. We show that these oscillations are not merely a “Gibbs-like” phenomenon due to the availability of only the visible region of the plane wave spectrum and they are not caused by multiple reflections between the horn and the near-field probe - but resulted from the interference between the direct field and the edge-diffracted fields in the horn aperture. An analytical model based on the Geometrical Theory of Diffraction is established, and it is demonstrated that this model qualitatively as well as quantitatively predicts the measurement results for the power flow. A full-wave analysis is carried out and the simulation results show qualitatively the intricate physical mechanism of the power flow distribution.
Dual-polarized probe systems can be used with some of the advantages: the two electric field comp... more Dual-polarized probe systems can be used with some of the advantages: the two electric field components are simultaneously measured within a single scan, amplitude and phase drift affects the two polarization components in the same way, and there is no need for mechanical rotation of the probe. In this work we design and test a dual-polarized probe system at 60 GHz a conical horn, including the elements: SPDT (single pole double throw) switch, an OMT (orthomode transducer) both components with 40 dB isolation a square to circular transition (3.75 mm to 3.58 mm), cables and two coaxial to waveguide adapters up to 67 GHz for OMT-switch connection. A 27 dBi gain conical horn is designed by using WIPL-D software and in-house manufactured. The 60 GHz probe system is being assembled and tested in planar near-field (PNF) setup at DTU. The results are validated by comparison with WIPL-D simulations, showing a good agreement within the validity region, down to -30 dB pattern levels. Channel ...
Users may download and print one copy of any publication from the public portal for the purpose... more Users may download and print one copy of any publication from the public portal for the purpose of private study or research. You may not further distribute the material or use it for any profit-making activity or commercial gain You may freely distribute the URL identifying the publication in the public portal If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.
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