A Reconfigurable Aperture Coupled Microstrip Patch Antenna with Beam Steering Capability on Silicon

First reconfigurable antenna came into existence in early 1980s. Reconfigurable antennas provide various functions in operating frequency, polarization & radiation patterns since it can be used to avoid noise sources, improve system gain & security [1]. Reconfiguring the Frequency is the major issue & lot of recent work has been done on frequency reconfigurability A Barium Strontium Titanate (BST) based reconfigurable Aperture-coupled patch antenna on high resistivity silicon substrates with beam steering capability using PIN doides has been proposed in this paper. For low dielectric constant region in silicon substrate, Micromachined technique is used. Varying voltage across BST layer changes its permittivity thereby tunable frequency is achieved and switching p-i-n diodes will steer the beam. A Novel structure is proposed which gives high directivity (> 6 dB), Good gain (> 5 dB), low VSWR (<1.5), low control voltages (