WISe: Wireless Intelligent Sensing for Human-Centric Applications

Qi, Alex; Ma, Muxin; Luo, Yunlong; Fernandes, Guillaume; Shi, Ge; Fan, Jia; Qi, Yihong; Ma, Jianhua

doi:10.1109/mwc.012.2100656

Cited by 7 publications

(4 citation statements)

References 15 publications

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“…High-quality, low-noise hardware systems are fundamental in millimeter-wave radar signal processing [7,24]. Isolation between Tx and Rx antennas is an important factor affecting the performance of radar systems.…”

Section: Discussionmentioning

confidence: 99%

“…The performance of FMCW radar is restricted by environmental ambient noise, intrasystem interference, and intersystem noise [7]. The system signal-to-noise ratio (SNR) is a figure of merit (FOM) for intrasystem noise.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, there are other factors that can affect the performance of FMCW radar, such as power coupled from Tx to Rx and transmitter phase noise [8]. High-resolution FMCW radar applications need to reduce noise from all aspects, especially the power coupling between Tx and Rx, which introduces intrasystem noise [7]. The Tx power coupled to the Rx increases the NF of the receiver and decreases the SNR which can reduce system resolution and can shorten the operation distance [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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Requirement Analysis and Teardrop-Based Design of High Antenna Isolation for FMCW Radar

Luo

Chi

Qi³

et al. 2022

Electronics

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Frequency-modulated continuous wave (FMCW) radar is widely used in automotive and consumer electronics because of its range, velocity, and angle measurement functionality. In an FMCW radar system, the isolation between transmitting (Tx) and receiving (Rx) subsystems affects the sensitivity of the FMCW system, which directly impacts the system’s overall performance in target detection. The factors that affect system performance include transmitter-to-receiver on-chip coupling and Tx-to-Rx antenna coupling. The on-chip isolation performance is basically fixed once a radar chip is given, but the antenna isolation performance depends on a designed antenna array. Usually, a targeted antenna requirement is first specified, and then the corresponding Tx and Rx antenna array is designed. However, there is no general principle or criteria for specifying a proper antenna isolation requirement in the existing research. In this paper, first, we reveal that the antenna isolation requirement should be set to be almost the same as the given on-chip isolation value, which is very significant as a general guideline in setting a targeted antenna isolation requirement. All current antenna isolation methods cannot reach the level of on-chip isolation in a compactly designed radar system. We further propose a teardrop-based method to provide high antenna isolation. The principle of an antenna isolation requirement and a novel antenna design using teardrops are both analyzed and demonstrated based on a representative 24 GHz FMCW radar. Our teardrop-shaped structure in the mouth of the conventional Vivaldi antenna achieved greater than 50 dB isolation, while the distance between the Tx and Rx antennas could be reduced to 2.1 mm.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Requirement Analysis and Teardrop-Based Design of High Antenna Isolation for FMCW Radar

Luo

Chi

Qi³

et al. 2022

Electronics

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“…Examples of low-power applications are mobile phone and laptop charging [27]- [28]. These low-power applications are regulated by two main standards: the Qi [29] and the Airfuel [30]. The Qi standard, suggests to operate in the range (110-205) kHz for chargers up to 5 W and (80-300) kHz for chargers up to 120 W. On the other hand, the Airfuel standard suggests an operating frequency of 6.78 MHz.…”

Section: Reference Applicationmentioning

confidence: 99%

Evaluation of Additive Manufacturing for Wireless Power Transfer Applications

Corti

Reatti

Pugi

et al. 2024

IEEE Trans. Ind. Electron.

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Additive Manufacturing (AM) has emerged as an economical and feasible technology for creating industrial components. This paper evaluates the use of AM for inductive Wireless Power Transfer (WPT) systems. In particular, the innovative use of metal 3D printing is proposed as a manufacturing process for the coils. For this reason, the recent improvement of metal AM is proposed as a suitable solution to increase design opportunities, reduce costs and production time while improving transmission efficiency. In fact, the WPT coil current distribution can be preliminarily studied through Finite Element Analysis (FEA) to optimize its cross-section and geometry. In this work, a general design procedure for WPT coils using metal AM is presented and this technology is compared with traditional solutions (i.e. hollow and litz wire) through extensive experimental measurements. The analysis shows that AM allows to reduce the parasitic resistance, costs and weight while increasing the transmission efficiency. Thus, the obtained results confirm the potential of AM for producing WPT coils, nominating this technology as a flexible, sustainable, and rapid solution for custom WPT coils production.

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