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Design and comparison of 24 GHz patch antennas on glass substrates for compact wireless sensor nodes

: Ohnimus, F.; Maaß, U.; Fotheringham, G.; Curran, B.; Ndip, I.; Fritsch, T.; Wolf, J.; Guttowski, S.; Lang, K.-D.

Volltext ()

International journal of microwave science and technology 2010 (2010), Art.535307, 9 S.
ISSN: 1687-5826
ISSN: 1687-5834
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IZM ()

Three patch antennas suitable for integration and operation in a compact 24 GH wireless sensor node with radar and communication functions are designed, chareacterized, and compared. Theantenas are manufactured on a low loss glass wafer using thin film (BCB/Cu) wafer level processing (WLP) technologies. This process is well suited for 3D stacking. The antennas are fed through a microstrip line underneath a ground plane coupling into the patch resonator through a slot aperture. Linear polarization (LP), dual mode (DM) operation, and circular polarization (CP) are achieved through the layout of the slot aperture and ectangular patch dimensions. Antenna gain values of5.5dBi are obtained in addition to the 10 dB impedance bandwidths of 900 MHz and 1.3 GHz as well as 500 MHz CP bandwidth with a 3 dB axial ratio for the LP, DM, and CP patch antennas, respectively