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Antenna Evaluation for VehicularApplications in Multipath Environment
Chalmers University of Technology, Sweden. (RISE, EMC)ORCID iD: 0000-0002-8182-5914
2017 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Antennas are essential components in any wireless communication system. To evaluate them is challenging, especially when new technologies are emerging.

Future intelligent transport systems, where vehicular communications play an important role will cover important aspects such as traffic safety and traffic efficiency. These applications will be covered by technologies such as IEEE 802.11p and LTE. For these emerging technologies, traditional methods for measuring the vehicular antennas such as anechoic chamber measurements or expensive and time-consuming field measurements may not be enough or suitable. Thus a new method for evaluating the antennas performance is desirable. A method that includes the multipath environment to give an idea of the antenna performance in the whole system and at the same time be able to be applied at early stages of product development. This thesis aims to provide such method.

The thesis is divided in two parts. The first part contains an overview and background of important concepts needed for development of methods for evaluation of vehicular antennas. In the second part, the papers that constitute the core of this work are appended.

In Paper A, we evaluate the vehicle’s antenna performance using only simulations. We start by defining the multipath environment for vehicle-tovehicle and vehicle-to-infrastructure (V2X) communication. Then, the V2X environment is simulated using a multipath simulation tool to evaluate the vehicle’s antennas radiation patterns placed at different positions on the vehicle. This will result in the received power cumulative distribution functions (CDFs) for the voltage samples at the receiving antennas port.

In Paper B, we present the design and evaluation of an antenna module for IEEE 802.11p and LTE technologies. The module is designed taking into consideration the available space and suitable placement on the vehicle. The proposed module is in accordance with the requirements for LTE and IEEE 802.11p technologies. This is validated with the analysis of the antenna efficiencies, S-parameters, radiation patterns, and diversity performance for the simulated and measured antenna module.

Finally, Paper C presents a method for the evaluation of V2V antennas in a simulated measurement-based multipath environment. Here, a measurement campaign is performed to obtain the parameters (i.e., the angular received power spectrum) that define a realistic V2V multipath environment. These parameters are then introduced in a multipath simulation tool where the antennas radiation patterns are evaluated. Results are expressed in terms of received power CDFs. This method is validated by comparing the simulated and measured received power for two roof-top vehicle antennas.

Place, publisher, year, edition, pages
Göteborg: Chalmers Reproservice , 2017.
Keywords [en]
Vehicular antenna evaluation, V2V measurements, V2V
National Category
Telecommunications
Identifiers
URN: urn:nbn:se:ri:diva-30075OAI: oai:DiVA.org:ri-30075DiVA, id: diva2:1120417
Presentation
2017-04-28, Chalmers, Göteborg, 10:00 (English)
Opponent
Supervisors
Funder
VINNOVAAvailable from: 2017-07-06 Created: 2017-07-06 Last updated: 2019-01-03Bibliographically approved
List of papers
1. Combined LTE and IEEE 802.11p Antenna for Vehicular Applications
Open this publication in new window or tab >>Combined LTE and IEEE 802.11p Antenna for Vehicular Applications
2015 (English)In: 2015 9th European Conference on Antennas and Propagation (EuCAP), 2015, article id 7228685Conference paper, Published paper (Refereed)
Abstract [en]

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.

Keywords
Antenna Module, LTE and 802.11p antennas, LTE and V2X antennas, Vehicular Antennas
National Category
Telecommunications
Identifiers
urn:nbn:se:ri:diva-30074 (URN)2-s2.0-84949641448 (Scopus ID)978-8-8907-0185-6 (ISBN)
Conference
9th European Conference on Antennas and Propagation (EuCAP 2015), May 13-17, 2015, Lisbon, Portugal
Available from: 2017-07-06 Created: 2017-07-06 Last updated: 2019-08-12Bibliographically approved
2. Evaluation of V2X antenna performance using a multipath simulation tool
Open this publication in new window or tab >>Evaluation of V2X antenna performance using a multipath simulation tool
Show others...
2014 (English)In: 8th European Conference on Antennas and Propagation, EuCAP 2014, 2014, , p. 2534-2538p. 2534-2538Conference paper, Published paper (Refereed)
Abstract [en]

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.

Publisher
p. 2534-2538
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-12511 (URN)10.1109/EuCAP.2014.6902335 (DOI)2-s2.0-84908626232 (Scopus ID)23922 (Local ID)23922 (Archive number)23922 (OAI)
Conference
8th European Conference on Antennas and Propagation, EuCAP 2014 The Hague; Netherlands; 6-11 Apr., 2014
Available from: 2016-09-13 Created: 2016-09-13 Last updated: 2019-08-12Bibliographically approved

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