| 1. |
- Algaba Brazalez, Astrid, 1983, et al.
(författare)
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Design of Millimeter-Wave Wideband Gap Waveguide Transitions Considering Integration into the Antenna System
- 2015
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Ingår i: 9th European Conference on Antennas and Propagation, EuCAP 2015, Lisbon, Portugal, 13-17 May 2015. - 9788890701856
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Konferensbidrag (refereegranskat)abstract
- Two wideband vertical transitions from inverted microstrip gap waveguide to rectangular waveguide (WR-15) for 60 GHz antenna array applications are proposed. Thesetransitions are aimed to interconnect the WR-15 with the gap waveguide feed-network employed to provide feeding to the radiating elements of slot/horn antenna arrays. The wideband field transformation is achieved without the need of adding a quarter-wavelength cavity backshort on a metal block placed over the transition. First, we replace this backshort by creating a cavity in the radiating layer when this is made in Substrate Integrated Waveguide (SIW) technology, and thereafter we use an air-filled pin cavity in the radiating layer. The simulated Sparametersshow that the presented transitions cover the unlicensed 60 GHz band (57-64 GHz) with good margins.
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| 2. |
- Athley, F., et al.
(författare)
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Analysis of Massive MIMO with hardware impairments and different channel models
- 2015
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Ingår i: 9th European Conference on Antennas and Propagation, EuCAP 2015, Lisbon, Portugal, 13-17 May 2015. - 9788890701856
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Konferensbidrag (refereegranskat)abstract
- Massive Multiple-Input Multiple-Output (MIMO) is foreseen to be one of the main technology components in next generation cellular communications (5G). In this paper, fundamental limits on the performance of downlink massive MIMO systems are investigated by means of simulations and analytical analysis. Signal-to-noise-and-interference ratio (SINR) and sum rate for a single-cell scenario multi-user MIMO are analyzed for different array sizes, channel models, and precoding schemes. The impact of hardware impairments on performance is also investigated. Simple approximations are derived that show explicitly how the number of antennas, number of served users, transmit power, and magnitude of hardware impairments affect performance.
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| 3. |
- Bengtsson, Erik, et al.
(författare)
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UE Antenna Properties and Their Influence on Massive MIMO System Performance
- 2015
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Ingår i: 2015 9th European Conference on Antennas and Propagation, EuCAP 2015. - 9788890701856
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Konferensbidrag (refereegranskat)abstract
- The use of large-scale antenna arrays can bring substantial improvements both in energy and spectral efficiency. This paper presents an initial study of user equipment (UE) antenna performance based on prototypes for a massive MIMO test bed. Most publications in the massive MIMO area have assumed isotropic or dipole antenna behavior at the UE side. It is, however, of greatest interest to evaluate the impact of realistic antenna implementations and user loading on such systems. Antennas are integrated into realistic UE form factors. Simulations are carried out to evaluate system performance using the UE antenna behavior measured in a Satimo StarGate 64. Comparisons are made with ideal isotropic un-correlated antennas. The presented UEs are designed for the 3.7 GHz band used by the LuMaMi massive MIMO test bed at Lund University.
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| 4. |
- Beukman, T. S., et al.
(författare)
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Equivalent Circuit of a Quadraxial Feed for Ultra-Wide Bandwidth Quadruple-Ridged Flared Horn Antennas
- 2015
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Ingår i: 9th European Conference on Antennas and Propagation, EuCAP 2015, Lisbon, Portugal, 13-17 May 2015. - 9788890701856
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Konferensbidrag (refereegranskat)abstract
- An equivalent circuit model of a quadraxial feed for ultra-wide bandwidth quadruple-ridged flared horn (QRFH) antennas is presented. The circuit is synthesised by only 3 unknowns and achieves an accurate input impedance for a wide range of dimensions. This model allows fast synthesis of optimal feeding designs that would ensure the excitation of the fundamental mode at the input of a QRFH.
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| 5. |
- Bondarik, Alexander, et al.
(författare)
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Implementation of UC-EBG Structure for 60 GHz Gridded Parasitic Patch Stacked Microstrip Antenna
- 2015
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Ingår i: 2015 9th European Conference on Antennas and Propagation (EuCAP). - 9788890701856 ; , s. 1-5
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Konferensbidrag (refereegranskat)abstract
- A uniplanar-compact electromagnetic band-gap (UC-EBG) structure is implemented at 60 GHz on a conventional PTFE (polytetrafluoroethylene) substrate. The structure surrounds a stacked microstrip antenna with gridded parasitic patch. The UC-EBG implementation results in about 5 dB decrease in the antenna E-plane normalized radiation pattern for angles along the substrate. The measured antenna gain increase at 60 GHz is 1.5 dB. Measured results are in good agreement with simulation. The design can be used for fifth generation (5G) wireless communication systems to reduce the antenna interference with other components.
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| 6. |
- Cappellin, C., et al.
(författare)
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Design of a Push-Broom Multi-Beam Radiometer for Future Ocean Observations
- 2015
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Ingår i: 9th European Conference on Antennas and Propagation, EuCAP 2015, Lisbon, Portugal, 13-17 May 2015. - 9788890701856
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Konferensbidrag (refereegranskat)abstract
- The design of a push-broom multi-beam radiometer for future ocean observations is described. The radiometer provides a sensitivity one order of magnitude higher than a traditional conical scanning radiometer, and has the big advantage of being fully stationary relative to the satellite platform. Thanks to a dense focal plane array and a dedicated optimization procedure, the instrument can accurately measure in C, X and Ku band and as close as 15 km to the coast line.
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| 7. |
- Condo Neira, Edith, 1979, et al.
(författare)
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Combined LTE and IEEE 802.11p Antenna for Vehicular Applications
- 2015
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Ingår i: Antennas and Propagation (EuCAP) Proceedings of the 9th European Conference, Lisbon, Portugal, April 2015. - 9788890701856 ; , s. Art. Nr 7228685-
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Konferensbidrag (refereegranskat)abstract
- Vehicles may contain multiple antennas for different applications. Among all of them, Vehicle-to-Vehicle and Vehicle-to-Infrastructure (V2X) is one of the most recent applications. This new technology focuses on traffic safety and traffic efficiency. In this paper we present a new compact antenna module suitable for vehicular applications. This module could be easily integrated into the rear-spoiler on a vehicle. The module consists of two identical monopoles for V2X applications based on the IEEE 802.11p standard and two identical printed inverted F-antennas for Long-Term Evolution (LTE) communications. The evaluation of the proposed module is done by analyzing the simulated and measured antenna S-parameters, antenna efficiencies, radiation patterns, as well as by calculating the diversity performance. The results show that the antennas are well matched and well isolated for both LTE and V2X and exhibits a radiation pattern close to the desired omnidirectional in the horizontal plane for V2X. The two LTE antennas have radiation patterns that complement each other ensuring an omnidirectional coverage by combination. Furthermore the module presents good radiation efficiency for both LTE and V2X.
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| 8. |
- de Villiers, D. I. L., et al.
(författare)
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Fast Prediction of Aperture Efficiency and Sidelobe Levels in Shaped Reflector Systems through Model Based Output Space Mapping
- 2015
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Ingår i: 9th European Conference on Antennas and Propagation, EuCAP 2015, Lisbon, Portugal, 13-17 May 2015. - 9788890701856
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Konferensbidrag (refereegranskat)abstract
- This paper presents a fast method to accurately predict the aperture efficiency and sidelobe levels of shaped dual reflector systems over a wide region of the shaping parameter space. Only a few full evaluations of the system, at different points in the shaping parameter space, are needed to construct the model used for the predictions. The output space mapping technique is used to correct the responses obtained from a simple geometric optics model of the system for any desired point in the shaping parameter space by using the expected aperture edge taper information available from the shaping mapping and the feed pattern. The method is evaluated for a range of feeds, frequencies, and parameter spaces and shown to provide significantly improved results over the geometric optics predictions, while being orders of magnitude faster than full wave or asymptotic methods
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| 9. |
- Diallo, C. D., et al.
(författare)
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Parallel-plate-waveguide luneburg lens through a holey plate metasurface
- 2015
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Ingår i: 2015 9th European Conference on Antennas and Propagation, EuCAP 2015. - : IEEE. - 9788890701856
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Konferensbidrag (refereegranskat)abstract
- This paper presents a parallel plate waveguide (PPW) Luneburg lens designed using an array of subwavelength circular holes etched on a metallic plate printed on a dielectric substrate. Variation of the hole radius modulates the effective permittivity. The lens operates in the Ka band of frequencies in a quasi-TEM mode. Easy to implement and low cost, the lens could be a good candidate as a lens-like beamformer for low loss multiple beam applications.
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| 10. |
- Fhager, Andreas, 1976, et al.
(författare)
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On the use of microwave based thermal monitoring in hyperthermia
- 2015
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Ingår i: 9th European Conference on Antennas and Propagation, EuCAP 2015, Lisbon, Portugal, 13-17 May 2015. - 9788890701856
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Konferensbidrag (refereegranskat)abstract
- Clinical results show that microwave based hyperthermia can dramatically improve the treatment outcome if combined with radiation and chemo therapy. During hyperthermia treatment it is necessary to monitor the heating in order to ensure that therapeutic temperatures are reached in the tumour, as well as to monitor hot-spots in non-tumour areas. Microwave imaging technology has the potential to be sensitive to changes in the dielectric tissue parameters caused by the hyperthermia heating. In this paper we discuss the feasibility for a combined heating / temperature monitoring system based entirely on microwave technology.
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