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Microstrip antennas on synthesized low dielectric-constant substrates

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3 Author(s)
Gauthier, G.P. ; Dept. of Electr. Eng. & Comput. Sci., Michigan Univ., Ann Arbor, MI, USA ; Courtay, A. ; Rebeiz, G.M.

Micromachining techniques using closely spaced holes have been used underneath a microstrip antenna on a high dielectric-constant substrate (εr=10.8) to synthesize a localized low dielectric-constant environment (εr=2.3). The measured radiation efficiency of a microstrip antenna on a micromachined 635-μm thick εr=10.8 Duroid 6010 substrate increased from 48±3% to 73±3% at 12.8-13.0 GHz (including 3.3-cm feed line losses). We believe that this technique can be applied to millimeter-wave antennas (microstrip, dipoles, slots, etc.) on silicon and GaAs substrates to result in relatively wideband (3-6%) monolithic microwave integrated circuits (MMIC) active antenna modules for phased-arrays and collision-avoidance systems

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Antennas and Propagation, IEEE Transactions on  (Volume:45 ,  Issue: 8 )