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Related Experiment Video

Updated: Oct 15, 2025

Autonomous and Rechargeable Microneurostimulator Endoscopically Implantable into the Submucosa

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Miniaturized Self-Resonant Micro Coil Array with A Floating Structure for Wireless Multi-Channel Transmission.

Byoung Ok Jun¹, Han-Joon Kim², Su Jin Heo¹

¹Department of Information and Communication Engineering, Daegu Gyeongbuk Institute of Science & Technology (DGIST), Daegu, 711-873, Korea.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)

|October 30, 2021

Summary

Researchers developed a novel micro-antenna using a floating coil stacked on a loop design. This approach enhances the quality factor (Q-factor) and frequency selectivity for micro-antennas.

Keywords:

high Q impedance matching micro antenna wireless power transmission

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Area of Science:

Electrical Engineering
Electromagnetics
Antenna Theory

Background:

Micro-antennas offer advantages due to their small size, enabling novel device applications.
Challenges include low quality factor (Q-factor), bulky impedance matching components, and poor selectivity in multi-array designs.

Purpose of the Study:

To address the limitations of current micro-antenna designs by improving Q-factor and selectivity.
To introduce a novel floating coil structure integrated with a loop micro-antenna.

Main Methods:

A floating coil structure was designed and stacked onto a loop micro-antenna.
Various floating coil configurations were fabricated using a simple process.
Impedance matching was optimized for specific target frequencies.
The Q-factor and frequency selectivity of different designs were evaluated.

Main Results:

A single-loop antenna design demonstrated a superior Q-factor compared to more complex configurations.
The micro-sized loop antenna with 80 µm trace width achieved the highest Q-factor of approximately 31 at 7 GHz.
Eight distinct floating coil designs provided high-frequency selectivity across the 1–7 GHz range.
The highest selectivity contrast exceeded 7, and wireless power transfer (WPT) efficiency reached around 1%.

Conclusions:

The proposed floating coil and loop micro-antenna design effectively enhances Q-factor and frequency selectivity.
The high integration density of this micro-antenna array is suitable for advanced applications like wireless neural stimulation and flexible display pixel arrays.