| 1. |
- Helander, Jakob, et al.
(author)
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60 GHz imaging of panels for defect detection using planar scanning
- 2016
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In: 2016 IEEE International Symposium on Antennas and Propagation (APSURSI), AP-S 2016. - 9781509028863 ; , s. 1025-1026
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Conference paper (peer-reviewed)abstract
- This paper presents imaging results of measurements conducted at 60 GHz, using the planar rectangular near-field technique. Utilizing the stated techniques at higher frequencies enables detection of smaller defects, and allows for a small measurement set-up in a laboratory environment. An algorithm based on the Fast Fourier Transform (FFT) has been developed in order to process the data. The paper provides measurement results for an illustrative panel, which show clear detection of the distributed defects. The purpose of this work is to enable processing of recent data from measurements of industrial composite panels.
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| 2. |
- Helander, Jakob, et al.
(author)
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Characterization of Millimeter Wave Phased Array Antennas in Mobile Terminal for 5G Mobile System
- 2015
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In: [Host publication title missing]. ; , s. 7-8
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Conference paper (peer-reviewed)abstract
- This paper presents a characterization method for millimeter wave (mmWave) phased array antennas in the mobile terminal for 5G communication. Arrays of different antenna designs, operating at 28 GHz, are evaluated according to novel characterization methods in this context - the total scan pattern of the phased array and its respective coverage efficiency. The results show the relevance of evaluating antenna array designs according to these characteristics, and illustrate, by introducing pattern diversity through sub-array schemes, that the coverage efficiency can be enhanced.
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| 3. |
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| 4. |
- Helander, Jakob, et al.
(author)
-
On the issue of simulating very large endfire arrays with complex antenna geometries
- 2016
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In: 2016 URSI International Symposium on Electromagnetic Theory, EMTS 2016. - 9781509025022 ; , s. 737-740
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Conference paper (peer-reviewed)abstract
- This paper discusses some of the main issues of efficient analysis of electrically very large endfire arrays, and further proposes approaches for developing flexible simulation tools for this particular purpose. Some initial results supporting the endfire array design issue are presented, as well as some preliminary examples of implemented compression- and acceleration methods.
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| 5. |
- Helander, Jakob, et al.
(author)
-
Performance Analysis of Millimeter-Wave Phased Array Antennas in Cellular Handsets
- 2016
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In: IEEE Antennas and Wireless Propagation Letters. - 1536-1225 .- 1548-5757. ; 15, s. 504-507
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Journal article (peer-reviewed)abstract
- This letter discusses the usage of high-gain steerable antenna arrays operating at millimeter-wave (mmWave) frequencies for future cellular networks (5G). Based on the probable outline of the 5G networks, a method for characterizing phased array antennas in cellular handsets has been introduced. For analyzing the performance, the total scan pattern of the array configuration together with its respective coverage efficiency are essential to consider in order to compare different antenna designs and topology approaches with each other. Two design approaches and subarray schemes of these have been considered in order to illustrate the relevance of such a characterization method. The results show the importance of evaluating potential array antennas in such manners. The method can be applied to much more complex system models, where polarization diversity, hand and body effect, and statistical modeling of the channel may be included.
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| 6. |
- Lundgren, Johan, et al.
(author)
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Near-Field Measurement and Calibration Technique for RF EMF Exposure Assessment of mm-wave 5G Devices
- 2019
-
Reports (other academic/artistic)abstract
- Accurate and efficient measurement techniques are needed for exposure assessment of 5G portable devices---which are expected to utilize frequencies beyond 6 GHz---with respect to the radio frequency electromagnetic field exposure limits. Above 6 GHz, these limits are expressed in terms of the incident power density, thus requiring that the electromagnetic fields need to be evaluated with high precision in close vicinity to the device under test (DUT), i.e., in the near-field region of the radiating antenna. This work presents a cutting-edge near-field measurement technique suited for these needs. The technique---based on source reconstruction on a predefined surface representing the radiating aperture of the antenna---requires two sets of measurements; one of the DUT, and one of a small aperture. This second measurement functions as a calibration of both the measurement probe impact on the received signal, and the experimental setup in terms of the relative distance between the probe and the DUT. Results are presented for a 28 GHz and a 60 GHz antenna array; both developed for 5G applications. The computed power density agrees well with simulations at evaluation planes residing as close as one fifth of a wavelength away from the DUT.
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| 7. |
- Xu, Bo, et al.
(author)
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Investigation of Planar Near-Field Measurement of Millimeter-Wave Antenna for 5G Application
- 2016
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In: 2016 INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION (ISAP). - : IEEE. - 9784885523137 ; , s. 600-601
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Conference paper (peer-reviewed)abstract
- The requirement of higher data rates and the emergence of new wireless device demands in future 5G communication put millimeter-wave frequencies in focus. To investigate electromagnetic-filed exposure at such frequencies for 5G cellular phone application, a planar near-field antenna measurement system is established. A tapered open-ended rectangular waveguide was used as the probe antenna, and a patch array antenna operating at 28 GHz was used as antenna under test. The distribution of power density above the antenna surface was calculated based on the measured data and the plane wave expansion method.
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| 8. |
- Ying, Z., et al.
(author)
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Study of phased array in UE for 5G mm wave communication system with consideration of user body effect
- 2016
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In: 2016 10th European Conference on Antennas and Propagation, EuCAP 2016. - : Institute of Electrical and Electronics Engineers (IEEE). - 9788890701863
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Conference paper (peer-reviewed)abstract
- The latest study of the millimeter wave (mmWave) phased array in user device (UE) for 5G communication is presented in this paper. Particularly, the body effect on the phased array in a UE/mobile terminal at 15 GHz is investigated with the 3D measured data. Its impact on the recently introduced parameter for phased array in mobile terminal, the total scanning pattern, body loss and the coverage efficiency, is analyzed.
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| 9. |
- Zhao, Kun, et al.
(author)
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User Body Effect on Phased Array in User Equipment for the 5G mmWave Communication System
- 2017
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In: IEEE Antennas and Wireless Propagation Letters. - : IEEE. - 1536-1225 .- 1548-5757. ; 16, s. 864-867
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Journal article (peer-reviewed)abstract
- The millimeter-wave phased array in the user equipment (UE) for 5G communication is studied in this letter. In particular, the body effect on the phased array in the UE at 15 GHz is investigated with the 3-D measurement data, and its impact on some key parameters for phased array in the UE, such as the total scan pattern, the coverage efficiency, and the probability of detection, are analyzed.
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