RF MEMS phase shifters and their application in phase array antennas

Scardelletti, M.C.; Ponchak, G.E.

doi:10.1109/wamic.2005.1528374

Cited by 5 publications

(1 citation statement)

References 9 publications

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“…Microelectromechanical systems (MEMS) technology has emerged as a promising approach for building a highperformance phase shifter with near-ideal signal performance in terms of low insertion loss, high return loss and high linearity that is essential for high-performance wireless communication and remote sensing systems, including radar sensors based on phased antenna arrays [1,2]. There are two major conventional radiofrequency (RF) MEMS phaseshifter concepts, that is, the switched true-time delay network (TTD) [3][4][5][6][7][8][9] and the distributed microelectromechanical transmission-line (DMTL) approach [10 -15].…”

Section: Introductionmentioning

confidence: 99%

Design approach for return-loss optimisation of multi-stage millimetre-wave microelectromechanical systems dielectric-block phase shifters

Somjit¹,

Oberhammer²

2012

IET Microwaves, Antennas &Amp; Propagation

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This study reports on the radiofrequency (RF) performance optimisation of a novel multi-stage microelectromechanical system (MEMS) dielectric-block phase-shifter concept. The objective is to minimise the average return loss for all possible operation states of a multi-stage phase shifter, without substantially compromising the overall insertion loss or in phase-shift performance. The optimisation method presented in this study is generally applicable to any type of multi-stage RF MEMS devices that are operated in all possible state combinations of the different stages. The return loss is optimized for a sevenstage MEMS dielectric-block phase shifter by adjusting the individual distances between the phase shifter stages, for the nominal frequency of 75 GHz as well as for 500 MHz and 1 GHz bandwidth. A total of seven different designs following different optimisation approaches are investigated by simulations and measurements of fabricated devices. The best concept was found for exponentially increasing distances between the stages that takes into account the proper actuation sequence for all possible phase-shift combinations. As compared with a non-optimised device previously published by the authors, the design offering the best compromise between return loss and insertion loss, achieved by this optimisation method, results in a significant return loss improvement of 11.8 dB (simulated) and 6.98 dB (measured), whereas compromising the insertion loss by only 0.75 dB (simulated) and 0.92 dB (measured). In contrast to that all other investigated concepts, including intuitive optimisation methods such as l/4 distances or optimisation of equidistant concepts result in a much smaller or no return-loss improvement and some even in a drastic worsening of the insertion loss.

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