mdh.sePublications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Vivaldi antenna with low frequency resonance for reduced dimensions
SP Technical Research Institute of Sweden, Borås, Sweden.
2013 (English)In: 2013 7th European Conference on Antennas and Propagation, EuCAP 2013, 2013, 2457-2459 p.Conference paper, Published paper (Refereed)
Abstract [en]

This paper describes a broadband antenna with a design similar to a Vivaldi antenna. The difference is that a resonance is added to get a widerfrequency range, which is used to reduce the dimensions of the antenna. The antenna is built and characterized by S11, radiation patterns, and gain.

Place, publisher, year, edition, pages
2013. 2457-2459 p.
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:mdh:diva-28768Scopus ID: 2-s2.0-84881308097ISBN: 9788890701832 (print)OAI: oai:DiVA.org:mdh-28768DiVA: diva2:848859
Conference
2013 7th European Conference on Antennas and Propagation, EuCAP 2013; Gothenburg; Sweden; 8 April 2013 through 12 April 2013
Available from: 2015-08-26 Created: 2015-08-26 Last updated: 2015-08-26Bibliographically approved
In thesis
1. Wireless measurement systems for health and safety
Open this publication in new window or tab >>Wireless measurement systems for health and safety
2015 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

This licentiate thesis presents an advanced wireless system, built on a single hardware platform, for applications in medicine and health. In order to design a single system, adaptable for different context, an accurate system specification is required.

The technical requirements are authenticated by actual tests in the environment where the system is intended to be used. The results of these measurements give an understanding of the possibilities of designing a real system but also acts as a base for deriving the empirical formulas to be used as the basis of the development and verification.

In summary, this work has included a larger measurement campaign and a verification of subsystems to support the development of wireless systems on a single hardware platform. This can be used for different measurements in medical healthcare and rescue work.

Previous systems for endurance tests have limitations in that they are not adapted to different sizes of mammals and they also have shortcomings in the quantification of data and scalability.

The developed system was validated on mice and humans. On mice the measurement parameters was the hormone dopamine and locomotion. For humans it was measured time for given distances. Both validation tests showed high correlation with the respective reference methods. The correlation coefficients of mice between the developed system and the former system ranged from 0.916 to 0.967. In the validation with humans, runners were clocked by the system clock and a manual stop watch. The lowest correlation coefficient was 0.864. Advantages with the developed system is that it is scalable and measures the activity level quantitatively in the unit meters and it can also be used for different sizes of mammals in different environments.

In tracking devices for rescue it is important that the transmitted signal can be detected at distances as large as possible. A support in the design work is to simulate path loss. This requires a path loss exponent, which was calculated after the measurement campaign. The results showed that the exponent of the height dependency decreases with antenna height above water. For the frequency 200 MHz, the exponent for the antenna height is 0.4 (vertical polarization) and 1.5 (horizontal polarization). For the distance dependency, the exponent was 3.59 (vertical polarization) and 3.22 (horizontal polarization). The path loss exponent is 2 for both the free space- and the ground reflection model.

An antenna’s physical dimension is to a large extent dependent on the lowest frequency. The research’s aim was to reduce the physical size by introducing a resonance frequency. The physical length was from the beginning 0.43 meter given by the lowest frequency used (0.7 GHz) and the antenna was reduced in size to 0.22 meter. 

Place, publisher, year, edition, pages
Västerås: Mälardalen University, 2015
Series
Mälardalen University Press Licentiate Theses, ISSN 1651-9256 ; 216
National Category
Medical Engineering
Research subject
Electronics
Identifiers
urn:nbn:se:mdh:diva-28765 (URN)978-91-7485-224-0 (ISBN)
Presentation
2015-10-02, Delta, Mälardalens högskola, Västerås, 14:15 (English)
Opponent
Supervisors
Available from: 2015-08-26 Created: 2015-08-25 Last updated: 2015-09-10Bibliographically approved

Open Access in DiVA

No full text

Scopus

Search in DiVA

By author/editor
Ödman, Torbjörn
Electrical Engineering, Electronic Engineering, Information Engineering

Search outside of DiVA

GoogleGoogle Scholar

Total: 183 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf