Velo3D

Researchers Demonstrate Wideband Metamaterial Absorber Made of 3D Printed Conductive Plastic

Desktop Metal

Share this Article

Architecture of the wideband MA

There’s been a lot of research into 3D printing metamaterials over the years – due to their unique properties, they’ve been used to make everything from headphones and heart valve models to door locks and acoustic holograms, and maybe someday even our very own invisibility cloaks. But ten years ago, the metamaterial absorber (MA), a type of metamaterial with compact size and thin configuration meant to efficiently absorb electromagnetic radiation, was presented for the first time. Since that time, there have been numerous other MAs, including dual-, triple-, and multiband varieties and the wideband MA.

Because of its high absorption, wideband MAs are highly sought after for applications in sensing, nondestructive detection, and imaging. There are a few ways to increase the absorption bandwidth for wideband MAs, but it’s still tough to manufacture them.

Unit cell of the MA: (a) perspective; (b) layout

A collaborative team of researchers from China’s Hefei University of Technology, the Beijing University of Chemical Technology, and Space Star Technology Co. Ltd. recently published a paper, titled “Wideband Metamaterial Absorbers Based on Conductive Plastic with Additive Manufacturing Technology,” that explains their development of a wideband MA based on 3D printed conductive plastic.

They believe that their new method is the first ever demonstration of a 3D printed wideband MA.

The abstract reads, “This paper proposes a wideband and polarization-insensitive metamaterial absorber (MA) based on tractable conductive plastic, which is compatible with an additive manufacturing technology. We provide the design, fabrication, and measurement result of the proposed absorber and investigate its absorption principle. The performance characteristics of the structure are demonstrated numerically and experimentally. The simulation results indicate that the absorption of this absorber is greater than 90% in the frequency range of 16.3−54.3 GHz, corresponding to the relative absorption bandwidth of 108%, where a high absorption rate is achieved. Most importantly, this additive manufactured structure provides a new way for the design and fabrication of wideband MAs.”

3D printing offers low cost, high efficiency, and convenience, but when it comes to making wideband MAs with the technology, it does lack an appropriately stable and tractable high-resistive film, as the typical materials used for this don’t work with 3D printing. But, the team thought that the absorption bandwidth of the MA could be increased by using highly conductive plastic.

Photographs of the fabrication process: (a) 3D printing PLA material layer; (b) fabricated sample

“The proposed structure provides new opportunities for the design and fabrication of wideband MAs,” the researchers wrote.

The team’s proposed wideband MA is made of a patterned conductive plastic layer embedded in a layer of PLA, the bottom of which is covered with a copper ground film.

“First, a PLA layer with grooves is 3D printed,” the researchers wrote. “Next, the patterned conductive plastics were placed in these grooves, and then the PLA is continually printed above the patterned plastics to seal them. Finally, copper is pasted on the bottom surface of the PLA layer.”

Once they verified that the MA would work, they tested its absorption spectrum, which is greater than 90% from 16.3 to 54.3 GHz. The absorber has a thin thickness and high absorptivity, along with polarization insensitivity. The researchers used numerical simulations of the absorber to demonstrate its mechanism, efficiency, and the surface loss for both the copper ground layer and conductive plastic layer, the latter of which “contributes most power absorption of the absorber for both resonant modes.”

The researchers explained, “Hence, the conductive plastic layer plays an important role in the wideband absorption.”

Measurement setup.

The design was verified in a free space experiment, and the researchers used two horn antennas, connected to a network analyzer, measured the sample’s performance charactertistics in the 18−40 GHz frequency range. This showed that their MA design achieved “a good agreement between the simulated and measured results.”

The research team showed that they could save money and simplify things by 3D printing an effective, high-performance wideband MA based on conductive plastic. Their design strategy also made the 3D printed structure insensitive to wave polarization.

 

 

 

“This study is expected to reveal the potential applications of additive manufacturing technology in the realization of wideband electromagnetic wave absorbers,” the researchers concluded.

Co-authors of the paper are Yujiao Lu, Baihong Chi, Dayong Liu, Sheng Gao, Peng Gao, Yao Huang, Jun Yang, Zhiping Yin, and Guangsheng Deng.

Discuss this research and other 3D printing topics at 3DPrintBoard.com or share your thoughts in the Facebook comments below. 

Share this Article


Recent News

3D Printing Webinar and Event Roundup: July 3, 2022

3D Printing News Briefs, July 2, 2022: 3D Printed Pasta & Prosthetics & More



Categories

3D Design

3D Printed Art

3D Printed Food

3D Printed Guns


You May Also Like

Featured

Grand Opening: AddUp Solution Center Offers LPBF & DED Metal 3D Printing

Global metal additive manufacturing OEM AddUp Solutions was established as a joint venture by French companies Michelin and fives back in 2015. The company’s main technology is laser powder bed fusion (LPBF) technology, but...

Can 3D Printing Make You Antifragile? Surviving Current Economic Shocks

In this, series we’ve looked at what being antifragile means and whether or not 3D printing can make a business antifragile. However, can 3D printing be antifragile as a good...

3D Printing Webinar and Event Roundup: June 26, 2022

Events for this week have already started, like the ISTE Live conference for technology in education down in New Orleans. Stratasys continues its Experience Tour in Ohio, Divide by Zero...

Three Production Opportunities for 3D Printing

While the additive manufacturing process has been around for 30 years, its use for production applications has recently accelerated because of improvements that enable faster production, high-quality materials, and larger...