| 1. |
- Algaba Brazalez, Astrid, 1983, et al.
(författare)
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Investigation of Transitions for Use in Inverted Microstrip Gap Waveguide Antenna Arrays
- 2014
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Ingår i: 8th European Conference on Antennas and Propagation, EuCAP 2014, The Hague, The Netherlands 6-11 April 2014. - 9788890701849 ; , s. 995 - 999
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Konferensbidrag (refereegranskat)abstract
- The main purpose of this work is to create good transitions for inverted microstrip-based versions of gap waveguide that are used to feed slot or horn antenna arrays. Two new millimeter-wave transitions from inverted microstrip gap waveguide to rectangular waveguide are presented. Both geometries are similar and consist of a planar probe, which contains a rectangular patch or T-section. The planar probe is inserted inside the rectangular waveguide through an opening made in the broadside wall of the waveguide. The main difference between the two geometries is that one of them extends upwards and the other one downwards with respect to the planar inverted microstrip gap waveguide circuit. The simulated S-parameters show promising results.
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| 2. |
- Beckman, C., et al.
(författare)
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Design Considerations for the EISCAT_3D Phased Array Antenna
- 2014
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Ingår i: 8th European Conference on Antennas and Propagation, EuCAP 2014. - Piscataway, NJ : IEEE. - 9788890701849 ; , s. 1700-1704
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Konferensbidrag (refereegranskat)abstract
- This paper presents a background and an overview of the initial design considerations for phased array antenna being designed for the New Generation multi-static, incoherent-scatter radar station - EISCAT-3D - in Northern Scandinavia. Its anticipated electrical, mechanical and environmental design requirements are given both by the physics as well as by the extreme climate in the subarctic region of northern Scandinavia.
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| 3. |
- Beukman, Theunis S., 1986, et al.
(författare)
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A Quadraxial Feed for Ultra-Wide Bandwidth Quadruple-Ridged Flared Horn Antennas
- 2014
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Ingår i: 8th European Conference on Antennas and Propagation, EuCAP 2014, The Hague, The Netherlands 6-11 April 2014. - 2164-3342. - 9788890701849 ; , s. 3312 - 3316
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Konferensbidrag (refereegranskat)abstract
- A quadraxial feed, excited by two orthogonal differential modes, is proposed for ultra wideband quadruple-ridged flared horn (QRFH) antennas that obviates the need for a balun. It is shown that in this configuration the fundamental TE11 mode is most strongly excited over the entire frequency band, while the higher-order modes are significantly suppressed, as compared to the conventional excitation using the ridge-to-coax balun transition. These properties lead to several advantages for QRFH antenna applications which require frequency-invariant beam characteristics, high port isolation and low cross-polarisation level, such as e.g. reflector antenna feeds for future radio telescopes.
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| 4. |
- Cappellin, C., et al.
(författare)
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Novel multi-beam radiometers for accurate ocean surveillance
- 2014
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Ingår i: 8th European Conference on Antennas and Propagation, EuCAP 2014. - 9788890701849 ; , s. 3531-3535
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Konferensbidrag (refereegranskat)abstract
- Novel antenna architectures for real aperture multi-beam radiometers providing high resolution and high sensitivity for accurate sea surface temperature (SST) and ocean vector wind (OVW) measurements are investigated. On the basis of the radiometer requirements set for future SST/OVW missions, conical scanners and push-broom antennas are compared. The comparison will cover reflector optics and focal plane array configuration.
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| 5. |
- Condo Neira, Edith, 1979, et al.
(författare)
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Evaluation of V2X Antenna Performance Using a Multipath Simulation Tool
- 2014
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Ingår i: Antennas and Propagation (EuCAP), Proceedings of the 8th European Conference, The Hague, The Netherlands, Apr. 2014. - 9788890701849 ; , s. 2534-+, s. 2534-2538
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Konferensbidrag (refereegranskat)abstract
- Antennas are one of the key components for efficient and reliable vehicular communications systems; especially for safety related applications the antenna performance is crucial. It is therefore important to be able to evaluate the antenna performance under realistic conditions so that the best antenna solution can be selected. In this paper we present a statistical method for evaluating the antenna performance by using the antennas radiation patterns and a multipath simulation tool. The multipath environment is generated by a number of incident waves with a specific angle of arrival distribution, defined by the user. In order to generate voltage samples at the antenna ports many sets of incident waves are generated. This simulates a changing environment as, e.g., when the vehicle is moving. By studying the cumulative distribution functions (CDFs) for the voltage samples we are able to compare the performance for different antenna types, positions on the vehicle, etc. The method is fast and effective and, when applied to typical vehicular propagation environments, the importance of having antennas with radiation patterns capable of covering the whole azimuth plane is demonstrated.
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| 6. |
- Dobsicek Trefna, Hana, 1979, et al.
(författare)
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Antenna Applicator for Microwave Hyperthermia Treatment of Pediatric Brain Cancer
- 2014
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Ingår i: 8th European Conference on Antennas and Propagation, EuCAP 2014, The Hague, The Netherlands 6-11 April 2014. - 9788890701849
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- A novel antenna applicator for microwave hyperthermia allowing treatment of deep brain tumors is proposed. The applicator consists of up to 16 antennas placed around the head in a helmet-like set-up and operates at a frequency range of 430-1000~MHz. The self-grounded bow-tie antennas are housed in a molded plastic enclosure with the shape of a truncated cone. The inner space of the enclosure is filled with distilled water. The antennas are attached to a perimetric water bolus with a thickness of 2 cm and aligned with the head shape. The focusing ability of the applicator was investigated on a homogeneous SAM model and on a model of a 13-year old patient containing a spherical tumor of 2 cm radius. Two different tumor positions were investigated: the right frontal lobe and the central brain. The obtained SAR distributions are favorable, although a relatively high level of energy is also absorbed on the surface of the body. This heating is however not expected to cause problems as it can be cooled by blood perfusion and water bolus. Our results show that focused microwave heating in the brain is feasible and warrants further verification on phantoms.
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| 7. |
- Einarsson, Bjarni Thor, 1987, et al.
(författare)
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Measurements of relative Throughput in Reverberation Chamber using Universal Software Radio Peripheral
- 2014
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Ingår i: 8th European Conference on Antennas and Propagation, EuCAP 2014, The Hague, The Netherlands 6-11 April 2014. - 2164-3342. - 9788890701849 ; , s. 1105-1108
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Konferensbidrag (refereegranskat)abstract
- This paper aims to show how Universal Software Radio Peripheral can be used in conjunction with reverberation chamber to measure throughput of wireless communication systems in Rich Isotropic Multipath environment. The results are in agreement with theories based on the threshold receiver model.
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| 8. |
- Gustafson, Carl, et al.
(författare)
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Modeling the cluster decay in mm-wave channels
- 2014
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Ingår i: 8th European Conference on Antennas and Propagation, EuCAP 2014. - 9788890701849 ; , s. 803-807
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Konferensbidrag (refereegranskat)abstract
- © 2014 European Association on Antennas and Propagation.The cluster power is an important parameter for cluster-based wireless channel models. This paper addresses modeling and estimation of the cluster power for wireless channels. A novel way of estimating the cluster decay and cluster fading, where the effects of the noise floor is taken into account, is presented. Due to the noise floor present in the measurement, only a limited number of clusters are available when estimating the cluster decay. It is shown that the estimated cluster decay and cluster fading can be improved if the effects of the noise floor and cluster fading are modeled and taken into account in the estimation step. If the noise floor is not taken into account in the estimation of the cluster decay, the resulting model can overestimate the RMS delay spread. Further, the paper includes estimates of the cluster decay and fading based on measured clusters for an indoor wireless mm-Wave channel in a conference room environment.
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| 9. |
- Gustafsson, M., et al.
(författare)
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OTA Characterization of mu BTS Antenna in RIMP and Random-LOS
- 2014
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Ingår i: 2014 8th European Conference on Antennas and Propagation (Eucap). Hague, NETHERLANDS. APR 06-11, 2014. - 2164-3342. - 9788890701849 ; , s. 1394-1397
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Konferensbidrag (refereegranskat)abstract
- During the past recent years, Huawei Technologies have had the ambition to strengthen the competence of the company by establishing cooperation projects with strong scientific academic centers in the world. The antenna department at Chalmers University of Technology is identified as one such important knowledge center, and a one year cooperation project was hence defined in 2012 and the project took off by October in the autumn that year. The goal of the project was to identify a compact antenna solution usable for small cell BTS solutions, which would support MIMO up to four layer spatial multiplexing. This paper is a brief summary of the methodology used for the theoretical studies done within the project, as well as a short presentation of the chosen bowtie antenna solution.
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| 10. |
- Iupikov, Oleg, 1983, et al.
(författare)
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Dense focal plane arrays for pushbroom satellite radiometers
- 2014
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Ingår i: 8th European Conference on Antennas and Propagation, EuCAP 2014; The Hague; Netherlands; 6 April 2014 through 11 April 2014. - 9788890701849 ; , s. 3536-3540
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Konferensbidrag (refereegranskat)abstract
- Performance of a dense focal plane array feeding an offset toroidal reflector antenna system is studied and discussed in the context of a potential application in multi-beam radiometers for ocean surveillance. We present a preliminary design of the array feed for the 5-m diameter antenna at X-band. This array is optimized to realize high antenna beam efficiency (∼ 95%) over a wide scan range (±20°) with very low side-lobe and cross-polarization levels.
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