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Please use this identifier to cite or link to this item: http://hdl.handle.net/1993/2882

Title: Microstrip phase shifter using ground-plane reconfiguration
Authors: Shafai, C
Sharma, SK
Shafai, L
Chrusch, DD
Keywords: microelectromechanical system (MEMS)
membrane
micromachining
microstrip
phase shifter
reconfigurable antenna
BAND
Issue Date: 31-Jan-2004
Citation: 0018-9480; IEEE TRANS MICROWAVE THEORY, JAN 2004, vol. 52, no. 1, p.144 to 153.
Abstract: In this paper, a new reconfigurable microstrip structure is presented where line impedance can be actively controlled to induce phase shift on a transmission-line signal. Micromachining is used to fabricate thin-film copper membranes in the ground plane below the transmission line. Actuation of these membranes enables control of transmission-line to ground-plane spacing and, thus, the line capacitance. The performance of this reconfigurable microstrip transmission line as a phase shifter is investigated between 5-32 GHz for a variety of membrane geometries. A phase shift of up to -32.1degrees at 15.00 GHz is achieved by actuating an array of five 4.3-mm-diameter membranes beneath a 30-Omega microstrip line. A single 10.0-mm-diameter membrane achieved a phase shift of -25.57degrees at 15.05 GHz on a 5642 line, while a 10.4-mm membrane achieved a phase shift of -55.5degrees at 14.25 GHz on a 30-Omega line. Both single and multiple series ground-plane membranes are possible, and they can be activated with discrete or continuous control signals, individually or together. Discrete and continuous phased array beam steering are, therefore, feasible.
URI: http://hdl.handle.net/1993/2882
DOI: http://dx.doi.org/10.1109/TMTT.2003.821263
Appears in Collection(s):Research Publications (UofM Student, Faculty and Staff only access)

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