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BETA
Öjefors, Erik
Alternative names
Publications (10 of 28) Show all publications
Lindberg, P. & Öjefors, E. (2006). A Bandwidth Enhancement Technique for Mobile Handset Antennas using Wavetraps. IEEE Transactions on Antennas and Propagation, 54(8), 2226-2233
Open this publication in new window or tab >>A Bandwidth Enhancement Technique for Mobile Handset Antennas using Wavetraps
2006 (English)In: IEEE Transactions on Antennas and Propagation, ISSN 0018-926X, E-ISSN 1558-2221, Vol. 54, no 8, p. 2226-2233Article in journal (Refereed) Published
Abstract [en]

A novel technique for enhancing the impedance bandwidth of wireless terminal antennas is presented. By introducing resonant short circuit transmission lines to the long sides of the chassis edges, an effective electrical shortening of the terminal ground plane is achieved. This effect has been used to realize terminal ground planes with resonant lengths at high frequencies, such as GSM 1800/1900.MHz or UNITS 2 GHz, thereby extending the impedance bandwidth. The proposed technique has been validated by simulations and measurements. Three typical applications are presented where the introduction of wavetraps improves the bandwidth and/or in-band performance.

Keywords
bandwidth, broadband communication, microstrip antennas, mobile antennas
National Category
Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-95373 (URN)10.1109/TAP.2006.879211 (DOI)000240116800006 ()
Available from: 2007-01-12 Created: 2007-01-12 Last updated: 2017-12-14Bibliographically approved
Cheng, S., Öjefors, E., Hallbjörner, P. & Rydberg, A. (2006). Compact reflective microstrip phase shifter for travelling wave antenna applications. IEEE Microwave and wireless components letters, 16(7)
Open this publication in new window or tab >>Compact reflective microstrip phase shifter for travelling wave antenna applications
2006 (English)In: IEEE Microwave and wireless components letters, Vol. 16, no 7Article in journal (Refereed) Published
National Category
Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-18033 (URN)
Available from: 2006-11-20 Created: 2006-11-20 Last updated: 2016-07-12
Caspers, F., Ekelöf, T., Ferrari, A., Johnson, M., Rydberg, A. & Öjefors, E. (2006). The EUROTeV confocal resonator monitor task. In: : . Paper presented at European Particle Accelerator Conference.
Open this publication in new window or tab >>The EUROTeV confocal resonator monitor task
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2006 (English)Conference paper, Published paper (Refereed)
National Category
Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-18189 (URN)
Conference
European Particle Accelerator Conference
Available from: 2007-05-10 Created: 2007-05-10 Last updated: 2016-07-12
Cheng, S., Öjefors, E., Hallbjörner, P. & Rydberg, A. (2006). Varactor diode phase shifters for electrically steerable microstrip travelling wave antennas. In: : . Paper presented at Antenna 2006, Linköping, Sweden, May 2006.
Open this publication in new window or tab >>Varactor diode phase shifters for electrically steerable microstrip travelling wave antennas
2006 (English)Conference paper, Published paper (Refereed)
National Category
Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-18039 (URN)
Conference
Antenna 2006, Linköping, Sweden, May 2006
Available from: 2006-11-20 Created: 2006-11-20 Last updated: 2016-07-12
Lindberg, P. & Öjefors, E. (2006). Wideband slot antenna for low-profile hand-held terminal applications. In: : . Paper presented at Proceedings of the 36th European Microwave Conference, Manchester, UK.
Open this publication in new window or tab >>Wideband slot antenna for low-profile hand-held terminal applications
2006 (English)Conference paper, Published paper (Refereed)
National Category
Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-23541 (URN)
Conference
Proceedings of the 36th European Microwave Conference, Manchester, UK
Available from: 2007-01-30 Created: 2007-01-30 Last updated: 2016-06-22
Lindberg, P., Öjefors, E. & Rydberg, A. (2005). A 24 GHz on-chip differential Wilkinson coupler using lumped components. In: GigaHertz 2005 Conference Proceedings.
Open this publication in new window or tab >>A 24 GHz on-chip differential Wilkinson coupler using lumped components
2005 (English)In: GigaHertz 2005 Conference Proceedings, 2005Conference paper, Published paper (Refereed)
Identifiers
urn:nbn:se:uu:diva-75978 (URN)
Available from: 2006-03-10 Created: 2006-03-10
Lindberg, P., Öjefors, E. & Rydberg, A. (2005). A SiGe 24 GHz monolithically integrated direct conversion receiver. In: GigaHertz 2005 Conference Proceedings.
Open this publication in new window or tab >>A SiGe 24 GHz monolithically integrated direct conversion receiver
2005 (English)In: GigaHertz 2005 Conference Proceedings, 2005Conference paper, Published paper (Refereed)
Identifiers
urn:nbn:se:uu:diva-75979 (URN)
Available from: 2007-02-08 Created: 2007-02-08
Grenier, K., Mazenq, L., Duboc, D., Bouchriha, F., Cocetti, F., Öjefors, E., . . . Plana, R. (2005). IC compatible MEMS technologies. In: 35th European Microwave Conference (EuMC).
Open this publication in new window or tab >>IC compatible MEMS technologies
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2005 (English)In: 35th European Microwave Conference (EuMC), 2005Conference paper, Published paper (Refereed)
Identifiers
urn:nbn:se:uu:diva-10713 (URN)
Available from: 2007-04-20 Created: 2007-04-20
Lindberg, P., Öjefors, E. & Rydberg, A. (2005). LTCC packaging for a 26 GHz SiGe receiver. In: GigaHertz 2005 Conference Proceedings.
Open this publication in new window or tab >>LTCC packaging for a 26 GHz SiGe receiver
2005 (English)In: GigaHertz 2005 Conference Proceedings, 2005Conference paper, Published paper (Refereed)
Identifiers
urn:nbn:se:uu:diva-75984 (URN)
Available from: 2006-03-10 Created: 2006-03-10
Öjefors, E., Kratz, H. & Rydberg, A. (2005). Membrane antenna for silicon based 3D integrated microsystems. In: MEMSWAVE 2005 Workshop.
Open this publication in new window or tab >>Membrane antenna for silicon based 3D integrated microsystems
2005 (English)In: MEMSWAVE 2005 Workshop, 2005Conference paper, Published paper (Refereed)
Identifiers
urn:nbn:se:uu:diva-75959 (URN)
Available from: 2006-03-10 Created: 2006-03-10
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