MULTI-BAND BALANCED ANTENNAS WITH ENHANCED STABILITY AND PERFORMANCE FOR MOBILE HANDSETS
Lead Research Organisation:
University of Bradford
Department Name: Sch of Engineering Design and Technology
Abstract
The move toward worldwide wireless communication continues at remarkable pace, and the antenna element of the technology is crucial to its success. Various mobile antenna structures have found increasing attention, significant characteristics being small size and low cost. However, the characteristics also need to be optimised with respect to the antenna radiation patterns and the Specific Absorption Rate (SAR) levels for compliance with international safety guidelines. Moreover, the antenna should have weak coupling with the body of the handset to provide the best performance stability and impedance matching in the presence of a human body, including the hand holding the handset. A good candidate is to use balanced antennas to reduce the effect of the mobile antenna on the handset, since unbalanced antennas drive current into the handset chassis, which interacts strongly with the unpredictable characterisitics of the body. The maximum specific absorption rate (SAR) values have been shown to be substantially reduced when placed next to the human head, compared with conventional unbalanced antennas, if these antennas are well-designed. The purpose of the study will be to design an antenna that will be developed using the Bradford hybrid electromagnetic modelling technique, allied to genetic algorithms to optimise the enhancement of the bandwidth. Multiple-band and wideband variants of these antennas for 2G, 3G, B3G and IEEE 802.x mobile bands will also be considered as a key target of the project.
Organisations
Publications
Abd-Alhameed R
(2012)
The Complete Surface-Current Distribution in a Normal-Mode Helical Antenna
in IEEE Antennas and Propagation Magazine
Abdul-Al M
(2022)
Wireless Electromagnetic Radiation Assessment Based on the Specific Absorption Rate (SAR): A Review Case Study
in Electronics
Al-Yasir Y
(2019)
Mixed-coupling multi-function quint-wideband asymmetric stepped impedance resonator filter
in Microwave and Optical Technology Letters
Al-Yasir Y.
(2018)
Design of very compact combline band-pass filter for 5G applications
in IET Conference Publications
Alhaddad A
(2011)
Low profile dual-band-balanced handset antenna with dual-arm structure for WLAN application
in IET Microwaves, Antennas & Propagation
Alhaddad A.G.
(2012)
Folded loop balanced coplanar antenna for wlan applications
in IEEE Transactions on Antennas and Propagation
| Description | The motivation for this project was that, while much is known in general about antennas for mobile handheld phones (which currently almost invariably have unbalanced feeds), little attention had been given to balanced antennas, which are expected to have better performance, in particular to give reduced absorption of radio energy by the user and greater stability in their performance. A side benefit of this reduced absorption in the user (known as "SAR") would be increased efficiency of the hand |
| Exploitation Route | The practical outcomes of this work are 1) a closer understanding and model of the strength of interaction of radiation from mobile phone handsets with their users' bodies and 2) designs of mobile handsets that reduce the strength of this interaction. The EPSRC funded the research into the design of new antennas for mobile phone handsets with reduced coupling between the hand and the handset. What that basically means is that the work looks into how a different sort of antenna could reduc |
| Sectors | Education Electronics Environment |
| URL | http://www.brad.ac.uk/ei/electrical-engineering-and-computer-science/research/radio-frequency-antennas-propagation-computational-electromagnetics/ |
| Description | Economy: Several new antenna designs were created that prove the reduced SAR and the desirable weak coupling with nearby objects, including the human body. As a result, a Knowledge Transfer Partnership Grant (KTP7277 - 18 months), in collaboration with Pace Plc was awarded. This concerns the design and implementation of MIMO antenna systems for Pace WLAN device products, with the aim of significantly improving network throughput and robustness. In addition, several industrial consultancies were |
| First Year Of Impact | 2009 |
| Sector | Communities and Social Services/Policy,Digital/Communication/Information Technologies (including Software),Education,Healthcare |
| Impact Types | Cultural Societal Economic |
| Description | Industrial Consultancy IETG |
| Amount | £15,000 (GBP) |
| Organisation | IETG |
| Sector | Private |
| Country | United Kingdom |
| Start | 02/2007 |
| End | 10/2007 |
| Description | Industrial Consultancy IETG |
| Amount | £25,000 (GBP) |
| Organisation | IETG |
| Sector | Private |
| Country | United Kingdom |
| Start | 06/2010 |
| End | 10/2010 |
| Description | Industrial contract with PACE plc |
| Amount | £4,000 (GBP) |
| Organisation | Pace |
| Sector | Private |
| Country | United States |
| Start | 11/2011 |
| End | 04/2012 |
| Description | KTP Project (Ref: KTP008734) |
| Amount | £239,025 (GBP) |
| Funding ID | KTP008734 |
| Organisation | Innovate UK |
| Sector | Public |
| Country | United Kingdom |
| Start | 08/2011 |
| End | 04/2014 |
| Description | KTP project (KTP7277) |
| Amount | £83,724 (GBP) |
| Funding ID | KTP7277 |
| Organisation | Innovate UK |
| Sector | Public |
| Country | United Kingdom |
| Start | 02/2009 |
| End | 09/2010 |
| Title | Dual band antenna designa and implementation within the ground level |
| Description | Patents (Filed): Title of invention: Multiband balanced antenna for portable communication devices Inventors: D Zhou, RA Abd-Alhameed and PS Excell Date of submission: 12 November 2009 with application number GB 0919479.6 |
| IP Reference | GB0720286.4 |
| Protection | Patent application published |
| Year Protection Granted | 2009 |
| Licensed | Yes |
| Impact | Part of this work has been applied to Pace plc company through knowledge transfer programme in 2010. |
| Title | Licence(s) pending (Final Report data) |
| Description | Activate previous patent application no. GB0722141.9, entitled 'Multiband balanced antenna for portable communication devices', combining with the recent new research outcomes from the present project on balanced antenna design for WLAN application, for which the Camitri Technologies company has expressed interest to adopt the design for use on laptops. A letter of interest and support from the Camitri Technologies company can be found in the attachments documents section. |
| IP Reference | |
| Protection | Protection not required |
| Year Protection Granted | 2009 |
| Licensed | Yes |
| Impact | The new balanced antenna provides the technical solution for the products of Camitri Technologies company. |
| Description | 'Health Applications for Wireless Technology', one-day Master class |
| Form Of Engagement Activity | Scientific meeting (conference/symposium etc.) |
| Part Of Official Scheme? | Yes |
| Type Of Presentation | keynote/invited speaker |
| Geographic Reach | Regional |
| Primary Audience | Public/other audiences |
| Results and Impact | 'Health Applications for Wireless Technology', one-day Master class, led by WCIC, CPD4 Health Innovation, "Health and Safety Aspects: Interference issues and regulations (Delivered by Prof Abd-Alhameed ), Sep. 2008. This activity greatly supports the open talk with the industry, for which our new research areas have been exploited. |
| Year(s) Of Engagement Activity | 2008 |
| Description | Health and Safety Considerations for Wireless Systems', Health applications for wireless technology CPD course |
| Form Of Engagement Activity | Scientific meeting (conference/symposium etc.) |
| Part Of Official Scheme? | No |
| Type Of Presentation | keynote/invited speaker |
| Geographic Reach | Regional |
| Primary Audience | Public/other audiences |
| Results and Impact | Health and Safety Considerations for Wireless Systems', Health applications for wireless technology CPD course, 15-18 December 2008, led by CPD4 Health Innovation (Delivered by Prof Excell), Dec. 2008. . We are able to engage two industries to support the final year projects. |
| Year(s) Of Engagement Activity | 2008 |
| Description | newspaper 'Telegraph & Argus' |
| Form Of Engagement Activity | A magazine, newsletter or online publication |
| Part Of Official Scheme? | No |
| Geographic Reach | International |
| Primary Audience | Public/other audiences |
| Results and Impact | An article was published on this present grant work in a Bradford local newspaper 'Telegraph & Argus' Please see the web link as followed: http://www.thetelegraphandargus.co.uk/news/2231933.universitys_800_000_bid_to_solve_phone_riddle/ . We have been called by the school to share several research shows to demonstrate the principles of the new results outcomes. |
| Year(s) Of Engagement Activity | 2008 |
| URL | http://www.thetelegraphandargus.co.uk/news/2231933.universitys_800_000_bid_to_solve_phone_riddle/ |