Abstract
A composite ceramic with nominal composition of 45.0 wt%(Ba0.5Sr0.5)TiO3–55.0 wt%MgO (acronym is BST–MgO) is sintered for fabricating a frequency reconfigurable aperture-coupled microstrip antenna. The calcined BST–MgO composite ceramic exhibits good microwave dielectric properties at X-band with appropriate dielectric constant ɛr around 85, lower dielectric loss tan δ about 0.01, and higher permittivity tunability 14.8% at 8.33 kV/cm. An ultrahigh E-field tunability of working frequency up to 11.0% (i.e., from 9.1 GHz to 10.1 GHz with a large frequency shift of 1000 MHz) at a DC bias field from 0 to 8.33 kV/cm and a considerably large center gain over 7.5 dB are obtained in the designed frequency reconfigurable microstrip antenna. These results demonstrate that BST materials are promising for the frequency reconfigurable antenna.
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