Scalable conformal array for multi-gigabit body centric wireless communication

Vasylchenko, A.; Farserotu, J.; Fernández-Bolaños, Montserrat; Ionescu, Adrian M.; Brebels, S.; Raedt, W. De; Vandenbosch, Guy A. E.

doi:10.1109/ismict.2011.5759800

Cited by 7 publications

(5 citation statements)

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“…A plethora of beam‐steering antenna arrays have been developed for 60 GHz band and are reported in the literature (e.g. see [12, 13]). However, sufficiently short links using low‐gain omnidirectional antennas, such as monopoles, may provide for sufficient signal‐to‐noise ratio (SNR) and alleviates the need for the use of large reconfigurable antenna arrays and complex electronics necessary to control them.…”

Section: Introductionmentioning

confidence: 99%

Millimetre‐wave path‐loss variability between two body‐mounted monopole antennas

Nechayev

Constantinou

et al. 2013

IET Microwaves, Antennas & Propagation

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Variation of on‐body millimetre‐wave propagation channels with body movements has been studied experimentally. A statistical description of the propagation channel is presented, including path‐loss probability distributions, level‐crossing rates and average fade durations. The median path losses for the considered practical links with omnidirectional monopole antennas lied within the range of 55–88 dB. The signal variation was found to consist of two superimposed variations, in general: the long‐term and short‐term fadings, but was dominated by the much stronger long‐term fading. The use of a simple two‐state Markov process model to describe on‐body communication links is also proposed and its limitations are discussed.

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Section: Introductionmentioning

confidence: 99%

Millimetre‐wave path‐loss variability between two body‐mounted monopole antennas

Nechayev

Constantinou

et al. 2013

IET Microwaves, Antennas & Propagation

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“…The first measurements of the beam steering concept demonstrate good return loss performance with small deviation versus simulations [22, 23]. Typical antenna radiation pattern behavior was measured and active beam steering measurements are currently ongoing.…”

Section: Rf-mems True-time Delay (Ttd) Line – Phase Shiftingmentioning

confidence: 99%

RF-MEMS switches with AlN dielectric and their applications

Badia

Nicole²,

Ionescu

2011

Int. J. Microw. Wireless Technol.

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This paper reports on the potential of RF-MEMS technology based on aluminum nitride capacitive dielectric and nickelsuspended membranes to provide RF circuit functions in reconfigurable front-end radios. The RF performance of capacitive switches, distributed MEMS transmission lines (DMTLs) phase shifters for beam steering and tunable filters, including center frequency and bandwidth tuning of bandpass and band-stop filters are presented. Detailed characterization based on S-parameter data demonstrates very promising figures of merit of all fabricated demonstrators from 5 to 40 GHz.Keywords: RF MEMS switch, phase shifter, tunable filter, modelling, simulation and characterization of devices and systems I . I N T R O D U C T I O NIn the last half-century, RF-MEMS switches have been extensively studied as they accomplish superior RF performance and higher linearity than semiconductor junction switches such as Positive-Intrinsic-Negative (PIN) diodes or Fieldeffect transistor (FETs) [1]. Despite their higher control voltages compared to some solid-state switches, electrostatic-actuated Micro-electro-mechanical-systems (MEMS) offer significant power savings as well as potential lower cost and the capability of miniaturization which result in attractiveness for their use in wireless applications.In reconfigurable front-end RF ICs, functions like RF switching, filtering, and phase shifting in reflector array antennas for beam steering/forming networks (as illustrated in Fig. 1), can be realized with RF-MEMS components and systems using the same technology in a single fabrication process. RF MEMS offer new possibilities for improved performance and allow higher density and capacity of the overall systems.In this paper we present capacitive shunt switches in terms of performance as well as their applications as phase shifters and tunable filters. In Section II, the state of the art of capacitive switches is studied and compared with different fabricated switch designs including those based on analog and digital capacitor concepts and switches with highly inductive components that were specifically designed as core devices for the applications presented in the subsequent sections. Then, in Section III analog and 2-bit digital true time delay (TTD) phase shifters are described as well as the co-integration of phase shifters and the dipole antennas for beam steering applications. Finally, tunable filters with different functionalities, as bandpass and band-stop filter configurations are shown in Section IV. I I . R F -M E M S C A P A C I T I V E S W I T C H › S W I T C H I N G A) ClassificationCapacitive switches are mainly divided into two subcategories depending on their different functionalities; the RF-MEMS capacitive switch or analog MEMS capacitor, with high isolation and an increased capacitance ratio, Cr (.30) and the MEMS switch capacitor or digital MEMS capacitor with a moderate and usually defined Cr , 5. Analog MEMS capacitors can be used for signal routing purposes, in reconfigurable front-ends, digitized capa...

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“…To date, the antenna research at millimeter-wave frequencies has mostly concentrated on planar configurations. A common solution for 360˚ area coverage is to use an array integrated on the four faces of a cube with two antennas realized on each face, such as in [5]. A different approach is presented in [6] where multi-faceted phased arrays are investigated.…”

Section: Introductionmentioning

confidence: 99%