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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: Antennas and Propagation (EuCAP) Proceedings of the 9th European Conference, Lisbon, Portugal, April 2015, 2015Conference 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 V2X antennas;
National Category
Telecommunications
Identifiers
urn:nbn:se:ri:diva-30074 (URN)
Conference
Antennas and Propagation (EuCAP) Proceedings of the 9th European Conference, Lisbon, Portugal, April 2015
Available from: 2017-07-06 Created: 2017-07-06 Last updated: 2017-07-06Bibliographically 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
2014 (English)In: 8th European Conference on Antennas and Propagation, EuCAP 2014, 2014, , p. 2534-2538Conference paper, Published paper (Refereed)
Publisher
p. 2534-2538
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-12511 (URN)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: 2017-07-06Bibliographically approved

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