Article

Embedded air cavity backed microstrip antenna on an LTCC substrate

University of Oulu, Microelectronics and Materials Physics Laboratories and EMPART Research Group of Infotech Oulu, P.O. Box 4500, FIN-90014 Oulu, Finland; University of Oulu, Telecommunication Laboratory, P.O. Box 4500, FIN-90014 Oulu, Finland; University of Surrey, School of Electronics and Physical Sciences, Surrey GU2 7XH, UK
Journal of the European Ceramic Society DOI:10.1016/j.jeurceramsoc.2006.11.012 pp.2881-2885

ABSTRACT One of the major challenges for next-generation, highly integrated, wireless system-on-packages (SOPs) is to integrate the antenna into the package. Due to the inherent narrow bandwidth of planar antennas on LTCC substrates that have moderate relative permittivities in the range 5–20, techniques for improving the bandwidth have to be considered in order to meet the requirements of wideband telecommunication standards. This paper presents a study of laser-micromachined air cavities embedded into an LTCC substrate, and their application in improving the bandwidth of an aperture coupled microstrip patch antenna operating at around 10 GHz. Furthermore, the effects of the air cavity on the size, gain, and radiation efficiency of the antenna are presented and discussed.

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Keywords

air cavity
 
bandwidth
 
inherent narrow bandwidth
 
laser-micromachined air cavities
 
LTCC substrates
 
major challenges
 
microstrip patch antenna
 
moderate relative permittivities
 
planar antennas
 
radiation efficiency
 
requirements
 
techniques
 
wideband telecommunication standards