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Wideband patch antenna array for multi-band UWB
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
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.

Place, publisher, year, edition, pages
2004.
Keyword [en]
Ultra wideband, UWB, patch antenna, wireless, antenna array
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-12793OAI: oai:DiVA.org:liu-12793DiVA: diva2:17070
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
In thesis
1. Ultra-wideband Antenna and Radio Front-end Systems
Open this publication in new window or tab >>Ultra-wideband Antenna and Radio Front-end Systems
2008 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The number of wireless communication applications increase steadily, leading to the competition for currently allocated frequency bands. Pressure on authorities around the world to permit communications 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 communication commission (FCC) in USA has unleashed the band 3.1-10.6 GHz for ultra-wideband radio (UWB) communications. The release has triggered a worldwide interest for UWB. Other regulatory instances throughout the world have issued use of UWB techniques as well. Capacity issues in form of data rate and latency have always been a bottleneck for broadened wireless-communication usages. New communication systems like UWB require larger bandwidth 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 bandwidth and other antenna parameters associated with wideband usages are studied. Furthermore, methods on how to enhance the performance when one antenna-element is not enough are studied as well.

The principle of antenna parallelism is demonstrated using both microstrip patch antennas and inverted-F antennas. Several techniques to combine the antennas in parallel have been evaluated. Firstly, a solution using power-splitters to form sub-arrays that covers one 500-MHz multi-band orthogonal frequency division multiplexing (OFDM) UWB is shown in Paper I. It is then proposed that the sub-bands are selected with a switching network. A more convenient method is to use the later developed frequency multiplexing technique as described in Paper V and VIII. Using the frequency multiplexing technique, selective connection of any number of antennas to a common junction is possible. The characteristic impedance is chosen freely, typically using a 50-Ω feed-line. Secondly, in Paper VIII a frequency-triplexed inverted-F antenna system is investigated to cover the Mode 1 multi-band UWB bandwidth 3.1-4.8 GHz. The antenna system is composed of three inverted-F antennas and a frequency triplexer including three 5th order bandpass filters. In Paper VI a printed circuit board integrated-triplexer for multi-band UWB radio is presented. The triplexer utilizes a microstrip network and three combined broadside- and edge-coupled filters. The triplexer is fully integrated in a four metal-layer printed circuit board with the minimum requirement on process tolerances. Furthermore, the system is built completely with distributed microstrips, i.e., no discrete components. Using the proposed solution an equal performance between the sub-bands is obtained. Finally suitable monopoles and dipoles are discussed and evaluated for UWB. In Paper X circular monopole and dipole antennas for UWB utilizing the flex-rigid concept are proposed. The flex-rigid concept combines flexible polyimide materials with the regular printed circuit board material. The antennas are placed entirely on the flexible part while the antenna ground plane and the dipole antenna balun are placed in the rigid part.

Place, publisher, year, edition, pages
Institutionen för teknik och naturvetenskap, 2008. 88 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1146
Keyword
Wireless communication, ultra-wideband, radio communication, UWB bandwidth, antenna parallelism
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:liu:diva-10338 (URN)978-91-85895-36-6 (ISBN)
Public defence
2008-02-29, K2, Kåkenhus, Campus Norrköping, Linköpings universitet, Norrköping, 10:00 (English)
Opponent
Available from: 2008-01-07 Created: 2008-01-07 Last updated: 2009-05-04
2. Low profile antennas for UWB
Open this publication in new window or tab >>Low profile antennas for UWB
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:nbn:se:liu:diva-32320 (URN)18212 (Local ID)91-85457-46-9 (ISBN)18212 (Archive number)18212 (OAI)
Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2013-11-07

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