Switchable-band shared-aperture slot-ring antennas with wide bandwidth and polarization agility are explored in this article for phased array applications. A common antenna aperture can be reconfigured between S-band and C-band arrays using PIN diode switches. A new arraying technique is implemented herein to achieve reconfigurable polarization states. Within each array element, only one port is needed to realize reconfigurable polarization states by providing appropriate phases to each port. Compared with the state of the art, this arrangement can reduce the number of ports of a large phased array by half, therefore significantly reduce the cost and complexity, eliminate the isolation between ports for orthogonal polarizations and improve the antenna efficiency. Firstly, the arraying technique is used on a reconfigurable slot-ring antenna, exhibiting 39.4%/38.3% fractional bandwidth (FBW) at S/C-band state. In order to demonstrate the arraying technique inside an array, a 2 x 2 S-band/4 x 4 C-band band-switchable wideband dual-polarized array is presented, fabricated and measured. This array shows 46.2%/52.6% FBW and 7.4-10.4/10.9-14.2dBi realized gain at S/C-band state. Secondly, a dual-wideband AMC is investigated and codesign with the antenna as a reflector to provide in-phase reflections in the two bands. The mutual couplings between the dual-band ports are reduced by a switchable microstrip feeding lines. The antenna/array exhibit octave bandwidth coverage (2.0-4.0/4.0-8.0GHz) with boresight realized gains from 5-8/5-12dBi at S/C-band state, respectively. The average mutual couplings between the two operation bands are -35dB/-25dB at S-/C-band state. Thirdly, a tri-band reconfigurable slot-ring antenna/array is presented. A single S-band antenna element can be switched to a 2 x 2 C-band array or a 4 x 4 X-band array, exhibiting 37.9%/46.0%/14.0% FBW at S/C/X-band state, respectively.
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Doctor of Philosophy (Ph.D.)
College of Engineering and Computer Science
Electrical and Computer Engineering
Length of Campus-only Access
Doctoral Dissertation (Open Access)
Huang, Junyi, "Switchable Slot-Ring Antennas for Customizable Phased Array Applications" (2021). Electronic Theses and Dissertations, 2020-. 700.