Miniaturized On-Chip NFC Antenna versus Screen-Printed Antenna for the Flexible Disposable Sensor Strips

With the ongoing trend toward miniaturization via system-on-chip (SoC), both radio-frequency (RF) SoCs and on-chip multi-sensory systems are gaining significance. This paper compares the inductance of a miniaturized on-chip near field communication (NFC) antenna versus the conventional screen-printed on-substrate ones that have been used for the transfer of sensory data from a chip to a cell phone reader. Furthermore, the transferred power efficiency in a coupled NFC system is calculated for various chip coil geometries and the results are compared. The proposed NFC antenna was fabricated via a lithography process for an application-specific integrated circuit (ASIC) chip. The chip had a small area of 2.4 × 2.4 mm2, therefore a miniaturized NFC antenna was designed, whereas the screen-printed on-substrate antennas had an area of 35 × 51 mm2. This paper investigates the effects of different parameters such as conductor thickness and materials, double layering, and employing ferrite layers with different thicknesses on the performance of the on-chip antennas using full-wave simulations. The presence of a ferrite layer to increase the inductance of the antenna and mitigate the interactions with backplates has proven useful. The best performance was obtained via double-layering of the coils, which was similar to on-substrate antennas, while a size reduction of 99.68% was gained. Consequently, the coupling factors and maximum achievable power transmission efficiency of the on-chip antenna and on-substrate antenna were studied and compared.

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An Enhanced Multiplication of RF Energy Harvesting Efficiency Using Relay Resonator for Food Monitoring

Sensors ◽

10.3390/s19091963 ◽

2019 ◽

Vol 19 (9) ◽

pp. 1963 ◽

Cited By ~ 1

Author(s):

Xuan-Tu Cao ◽

Wan-Young Chung

Keyword(s):

Energy Harvesting ◽

Power Transmission ◽

Near Field ◽

Magnetic Coupling ◽

Electrical Energy ◽

Transmission Efficiency ◽

Smart Sensor ◽

Rf Energy Harvesting ◽

Sensor Module ◽

Rf Energy

Recently, radio frequency (RF) energy harvesting (RFEH) has become a promising technology for a battery-less sensor module. The ambient RF radiation from the available sources is captured by receiver antennas and converted to electrical energy, which is used to supply smart sensor modules. In this paper, an enhanced method to improve the efficiency of the RFEH system using strongly coupled electromagnetic resonance technology was proposed. A relay resonator was added between the reader and tag antennas to improve the wireless power transmission efficiency to the sensor module. The design of the relay resonator was based on the resonant technique and near-field magnetic coupling concept to improve the communication distance and the power supply for a sensor module. It was designed such that the self-resonant frequencies of the reader antenna, tag antenna, and the relay resonator are synchronous at the HF frequency (13.56MHz). The proposed method was analyzed using Thevenin equivalent circuit, simulated and experimental validated to evaluate its performance. The experimental results showed that the proposed harvesting method is able to generate a great higher power up to 10 times than that provided by conventional harvesting methods without a relay resonator. Moreover, as an empirical feasibility test of the proposed RF energy harvesting device, a smart sensor module which is placed inside a meat box was developed. It was utilized to collect vital data, including temperature, relative humidity and gas concentration, to monitor the freshness of meat. Overall, by exploiting relay resonator, the proposed smart sensor tag could continuously monitor meat freshness without any batteries at the innovative maximum distance of approximately 50 cm.

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Near-field channel measurements for UWB RFID with on-chip antenna

2012 IEEE International Workshop on Antenna Technology (iWAT) ◽

10.1109/iwat.2012.6178390 ◽

2012 ◽

Author(s):

Nikola Gvozdenovic ◽

Philipp K. Gentner ◽

Christoph F. Mecklenbrauker

Keyword(s):

Near Field ◽

Channel Measurements ◽

On Chip Antenna ◽

On Chip

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Silicon based on-chip antenna using an LC resonator for near-field RF systems

Solid-State Electronics ◽

10.1016/j.sse.2011.08.002 ◽

2012 ◽

Vol 67 (1) ◽

pp. 100-104 ◽

Cited By ~ 2

Author(s):

Kenji Okabe ◽

Wanghoon Lee ◽

Yasoo Harada ◽

Makoto Ishida

Keyword(s):

Near Field ◽

Rf Systems ◽

On Chip Antenna ◽

Lc Resonator ◽

On Chip ◽

Silicon Based

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A 60-GHz CMOS Transceiver With On-Chip Antenna and Periodic Near Field Directors for Multi-Gb/s Contactless Connector

IEEE Microwave and Wireless Components Letters ◽

10.1109/lmwc.2017.2678444 ◽

2017 ◽

Vol 27 (4) ◽

pp. 404-406 ◽

Cited By ~ 9

Author(s):

Yanghyo Kim ◽

Sai-Wang Tam ◽

Tatsuo Itoh ◽

Mau-Chung Frank Chang

Keyword(s):

Near Field ◽

60 Ghz ◽

On Chip Antenna ◽

On Chip

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Textile-Based Coils for Inductive Wireless Power Transmission

Applied Sciences ◽

10.3390/app11094309 ◽

2021 ◽

Vol 11 (9) ◽

pp. 4309

Author(s):

Sebastian Micus ◽

Laura Padani ◽

Michael Haupt ◽

Götz T. Gresser

Keyword(s):

Electromagnetic Induction ◽

Power Transmission ◽

Near Field ◽

Electrical Energy ◽

Transmission Efficiency ◽

Maximum Efficiency ◽

Wireless Power ◽

Wireless Power Transmission ◽

Conductive Materials ◽

Transmission Quality

We developed and evaluated different textile-based inductive coils for near-field wireless power transmission. The technology uses electromagnetic induction for the contactless transfer of electrical energy. Therefore, we investigated various methods for the attachment of conductive materials on a textile-based material and the production of textile-based coils based on QI standard. Afterwards, the textile-based coils were examined and evaluated due to their specific quality characteristics. This happens by calculating the transmission quality and the maximum efficiency of the system which enables comparison of different coil systems and indicates the transmission efficiency of the systems.

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92.5% Average Power Efficiency Fully Integrated Floating Buck Quasi-Resonant LED Drivers Using GaN FETs

Electronics ◽

10.3390/electronics9040575 ◽

2020 ◽

Vol 9 (4) ◽

pp. 575

Author(s):

Mei Yu Soh ◽

S. Lawrence Selvaraj ◽

Lulu Peng ◽

Kiat Seng Yeo

Keyword(s):

Integrated Circuit ◽

Power Efficiency ◽

Average Power ◽

Input Voltage ◽

Led Driver ◽

Fully Integrated ◽

Voltage Range ◽

Percentage Improvement ◽

On Chip ◽

Led Drivers

LEDs are highly energy efficient and have substantially longer lifetimes compared to other existing lighting technologies. In order to facilitate the new generation of LED devices, approaches to improve power efficiency with increased integration level for lighting device should be analysed. This paper proposes a fully on-chip integrated LED driver design implemented using heterogeneous integration of gallium nitride (GaN) devices atop BCD circuits. The performance of the proposed design is then compared with the conventional fully on-board integration of power devices with the LED driver integrated circuit (IC). The experimental results confirm that the fully on-chip integrated LED driver achieves a consistently higher power efficiency value compared with the fully on-board design within the input voltage range of 4.5–5.5 V. The maximal percentage improvement in the efficiency of the on-chip solution compared with the on-board solution is 18%.

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Determining the input reflection coefficient of integrated antennas using over-the-air measurements under near-field conditions

International Journal of Microwave and Wireless Technologies ◽

10.1017/s1759078720001129 ◽

2020 ◽

pp. 1-7

Author(s):

A.J. van den Biggelaar ◽

D.P.P. Daverveld ◽

A.C.F. Reniers ◽

A.B. Smolders ◽

U. Johannsen

Keyword(s):

Reflection Coefficient ◽

Integrated Circuit ◽

Near Field ◽

Cost Effective ◽

High Volume ◽

Testing Procedure ◽

Field Conditions ◽

Integrated Antennas ◽

Measurement Results ◽

On Chip

Abstract One of the current trends in the integrated circuit (IC) development is the integration of antennas on-chip or in the package of the IC. This poses challenges in the production testing process of the packaged IC, as the antenna functionality has to be included and at least one of the signal ports cannot be accessed at a conducted manner. In order to measure the reflection coefficient of an integrated antenna, a contactless characterization method (CCM) can be used. In this paper, the practicality of a CCM is assessed, having the application of a cost-effective high-volume testing procedure for integrated antennas in mind. It is shown that the CCM yields accurate results for different imperfections in the measurement setup. Moreover, measurement results around 33 GHz using a connectorized patch antenna are shown, which experimentally verify the validity of using the CCM under near-field conditions.

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