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Optimisation of MEMS-controlled reflectarray phase shifter cell

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3 Author(s)
F. A. Tahir ; LAAS¿CNRS, 7 avenue du colonel Roche, F-31077 Toulouse, France ; H. Aubert ; E. Girard

An optimised design of an MEMS-based phase-shifter cell (reflectarray unit cell) based on an equivalent circuit model is presented. The optimisation is performed by controlling five key design parameters of the unit cell which are: the number of MEMS switches, their state (ON/OFF), their appropriate location inside the slot, their ON/OFF capacitances and whether they should be used singly or in a pair. By controlling and regulating these parameters through the equivalent electrical circuit, the design of the phase-shifter cell can be optimised. This optimisation process results in phase-shifter configurations that permit a 360° phase range along with the required number of linearly distributed phase states. Minimisation of power losses within the unit cell is also an issue addressed by the optimisation process.

Published in:

IET Microwaves, Antennas & Propagation  (Volume:5 ,  Issue: 3 )