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Low profile antennas for UWB
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
2005 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The number of wireless communication applications increases steadily, leading to the competition for currently allocated frequency bands. Pressure on authorities around the world to permit communication in higher and wider frequency ranges to achieve higher wireless capacity than those existed in the past has resulted in several new specifications. The federal communications commission (FCC) in USA has unleashed the band 3.1-10.6 GHz for ultra-wideband radio (UWB) communication. The release has triggered a worldwide interest for UWB. Capacity issues in form of data rate and latency have always been a bottleneck for broadened wireless-communication usages. The new communication systems like UWB require higher spectral efficiency than what is normally utilized with traditional antenna techniques. The interest for compact consumer electronics is growing in the meantime, creating a demand on efficient and low profile antennas which can be integrated on a printed circuit board. In this thesis, some methods to extend the spectral efficiency and other antenna parameters associated with wide band usages are developed and discussed. Furthermore, methods on how to enhance the performance when one antennaelement is not enough are studied as well.

Place, publisher, year, edition, pages
Norrköping: Linköping University , 2005. , 30 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1202
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-32320Local ID: 18212ISBN: 91-85457-46-9 (print)OAI: oai:DiVA.org:liu-32320DiVA: diva2:253142
Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2013-11-07
List of papers
1. Wideband patch antenna array for multi-band UWB
Open this publication in new window or tab >>Wideband patch antenna array for multi-band UWB
2004 (English)In: Proc. IEEE 11th Symp. on Communications and Vehicular Tech., Ghent, Belgium, November, 2004Conference paper, Published paper (Refereed)
Abstract [en]

As wireless communication applications require more and more bandwidth, the demand for wideband antennas increases as well. For instance, ultra wideband radio (UWB) will utilize the frequency-band of 3.1-10.6 GHz. Microstrip patch antennas have advantages of low cost and compatibility to the printed circuit board (PCB) technology, having the possibility to integrate the antenna with the circuit board. Since patch antennas have ground planes, components can be placed on the other side of the PCB, this allows a compact module design. However, the microstrip patch antenna has drawback of small bandwidth. Bandwidth is limited since the substrate height is limited. To overcome these drawbacks, we have studied a method to use a patch array with varied patch lengths on a low loss PCB. Patches electrically far away from each other will give independent resonances. By choosing several patch lengths so that the standing wave ratio (SWR) plots of the antennas overlap, they can be combined into one wideband with a power-divider. Several arrays can be combined to a multi-band antenna system using switches. A patch antenna array for the multiband UWB in the frequency band of 3.1-10.6 GHz is presented in this paper.

Keyword
Ultra wideband, UWB, patch antenna, wireless, antenna array
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-12793 (URN)
Conference
IEEE 11th Symp. on Communications and Vehicular Tech., Ghent, Belgium, November
Available from: 2008-01-07 Created: 2008-01-07 Last updated: 2013-11-07
2. An integrated spiral antenna system for UWB
Open this publication in new window or tab >>An integrated spiral antenna system for UWB
2005 (English)In: Proc. IEEE 35th European Microwave Conference, 4-6 October, Paris, France, 2005, 2007-2010 p.Conference paper, Published paper (Refereed)
Abstract [en]

As wireless communication applications require more and more bandwidth, the demand for wideband antennas increases as well. For instance, the ultra wideband radio (UWB) utilizes the frequency band of 3.1-10.6 GHz. The spiral antenna has a higher spectral efficiency than other planar antennas like the patch antenna. Theoretically, any type of antennas can be combined into different kind of arrays, in order to improve performance beyond that from one single antenna. The electrically coupled parallelism is one solution to extend bandwidth. By combining two spiral antennas with different radius of the radiation zone, the standing wave ratio (SWR) can be kept low for a large bandwidth, resulting in an improved spiral antenna performance for UWB. Furthermore, a study of how spiral dimensions impact on gain and SWR was conducted and presented.

Keyword
uwb, antenna, ultra wideband radio, spiral antenna
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-12794 (URN)10.1109/EUMC.2005.1610362 (DOI)
Available from: 2008-01-07 Created: 2008-01-07 Last updated: 2013-11-07
3. Monofilar spiral antennas for UWB with and without air core
Open this publication in new window or tab >>Monofilar spiral antennas for UWB with and without air core
2007 (English)In: ISAST Transactions on Electronics and Signal Processing, ISSN 1797-2329, Vol. 2, no 1, 64-70 p.Article in journal (Refereed) Published
Abstract [en]

One of the trends in wireless communicationis that systems require more and more frequency spectrum.Consequently, the demand for wideband antennas increasesas well. For instance, the ultra wideband radio (UWB)utilizes the frequency band of 3.1-10.6 GHz. Such abandwidth is more than what is normally utilized with asingle low-profile antenna. Low profile antennas arepopular because they are integratable on a printed circuitboard. However, the fractional bandwidth is usually anissue for low profile antennas because of the limitedsubstrate height. The monofilar spiral antenna on the otherhand has higher fractional bandwidth, and at GHzfrequencies the physical dimensions of the spiral isreasonable. Furthermore, a study of how spiral dimensionsimpact on antenna gain and standing wave ratio (SWR) wasconducted and presented. Simulated results were comparedwith measurements.

National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:liu:diva-12795 (URN)
Available from: 2008-01-07 Created: 2008-01-07 Last updated: 2013-11-07
4. Air core patch antennas suitable for multi-band UWB
Open this publication in new window or tab >>Air core patch antennas suitable for multi-band UWB
2005 (English)In: Proc. GigaHertz 2005, Uppsala, Sweden, 2005, 218-221 p.Conference paper, Published paper (Refereed)
Abstract [en]

As wireless communication applications grow rapidly, the demand for modular solutions with high performance and low profile antennas increases. For instance, the ultra wideband radio (UWB) utilizes the frequency band of 3.1-10.6 GHz. Integrateable antennas should be of planar structures. A Planar structure limits design options, regarding various performance aspects. For instance, the spectral efficiency, i.e., the bandwidth (BW) relative to the center frequency (CF) is limited. The antenna efficiency, i.e., gain relative to directivity is also limited. The antenna efficiency is important for receiver sensitivity, which is important in UWB systems. The efficiency is dependant of the antenna structure and material used. The Rogers 4350B material is suitable for high frequency modules since it has a low loss tangent that is stable over a wide frequency range, but the substrate height is limited. In this study a printed circuit board (PCB) with an air core was introduced to increase the antenna efficiency. The module is processed as two separate double-layer PCBs. This technique can be implemented to increase the performance in a narrowband as well as in a wideband antenna system. An advantage is that components can be placed on the other side of the ground plane without interference since the ground plane shields components from antenna radiation. A study of how the antenna bandwidth and efficiency are improved with the proposed structure at 3.5 and 10 GHz was conducted and presented.

National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-12796 (URN)
Available from: 2008-01-07 Created: 2008-01-07 Last updated: 2013-11-07

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