Design of Thin RC Absorbers Using a Silver Nanowire Resistive Screen

Micro & Optical Tech Letters

Tentzeris

et al. 2018

To demonstrate the high-speed demodulation capability of the ED, an OOK receiver integrating the ED and an onchip D-band amplifier is tested for an air channel, as shown in Figure 5. The simulated gain of D-band amplifier is 7 dB at 120 GHz and the 3-dB bandwidth is 11.5 GHz. A 120-GHz carrier is modulated with 2 9 PRBS by a D-band switched-type modulator. The OOK-modulated signal is transferred between two 20-dBi horn antennas apart by a distance of 0.11 m. The OOK receiver including the ED, followed by a baseband amplifier, demodulates the received signal. Figure 6 shows the measured eye-diagram of the baseband output when the data rate changes from 1 to 4 Gbps. It should be noted that the maximum data rate is limited by the narrowband on-chip D-band amplifier, not by the ED that operates over the entire D-band.An HD video signal is also transferred through the air channel and is reconstructed by the receiver to validate the practical application of the ED. The video signal is encoded and decoded, following the SMPTE 292M standard with a data rate of 1.485 Gbps. As can be seen in Figure 7, the transmitted video signal is well reconstructed at the receiver output. | C ONCL US I ONA D-band ED is fabricated in a low-cost 65-nm bulk CMOS process for high-speed OOK wireless communication. The measured average responsivity and NEP are 1.16 kV/W and 234 pW/Hz 1/2 , respectively, over the entire D-band. The ED effectively demodulates the OOK signal up to 4-Gbps over an air-channel distance of 0.11 m. Moreover, an HD video signal at 1.485 Gbps is successfully demodulated and reconstructed using an OOK receiver integrating this ED.

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Low‐cost metamaterial absorber using three‐dimensional circular truncated cone

Yoon

Micro & Optical Tech Letters

Tentzeris

et al. 2018

“…Metamaterials can be realised using a periodic array of resonators, such as the split-ring resonator (SRR) 2 . Because of their extraordinary features, they have been used for many applications, such as compact microwave circuits 3 , super lenses 4 , miniaturised wireless components 5 , and absorbers 6 in the microwave and terahertz bands.…”

Section: Introductionmentioning

confidence: 99%

Wide Incidence Angle-Insensitive Metamaterial Absorber for Both TE and TM Polarization using Eight-Circular-Sector

Nguyen

2017

Sci Rep

In this paper, a wide incidence angle-insensitive metamaterial absorber is proposed using eight-circular-sector (ECS). Under normal incidence, the proposed absorber shows high absorptivity at different polarizations due to its symmetric geometry. Under oblique incidence, zero-reflection conditions for transverse electric (TE) and transverse magnetic (TM) polarization are different. Nevertheless, the proposed absorber shows high absorptivity under oblique incidence of both TE and TM polarization due to ECS. The performance of the proposed absorber was demonstrated with full-wave simulation and measurements. The simulated absorptivity at the specular angles exceed 90% and the frequency variation is less than 0.7% at approximately 9.26 GHz up to a 70° incidence angle in both TM and TE polarization. We built the proposed absorber on a printed-circuit board with 20 × 20 unit cells, and we demonstrated its performance experimentally in free space. The measured absorptivity at 9.26 GHz for the specular angles is close to 98% for all polarization angles under normal incidence. As the incidence angle is varied from 0° to 70°, the measured absorptivity at 9.26 GHz for the specular angles remain above 92% in both TE and TM polarization.

“…Owing to this extraordinary feature, metamaterials are used in cloaking technology [1], super lenses [2], antennas [3], and control components in the THz band [4]. …”

Section: Introductionmentioning

confidence: 99%

A Stretchable Electromagnetic Absorber Fabricated Using Screen Printing Technology

Jeong

2017

Sensors

A stretchable electromagnetic absorber fabricated using screen printing technology is proposed in this paper. We used a polydimethylsiloxane (PDMS) substrate to fabricate the stretchable absorber since PDMS exhibits good dielectric properties, flexibility, and restoring capabilities. DuPont PE872 (DuPont, Wilmington, CT, USA), a stretchable silver conductive ink, was used for the screen printing technique. The reflection coefficient of the absorber was measured using a vector network analyzer and a waveguide. The proposed absorber was designed as a rectangular patch unit cell, wherein the top of the unit cell acted as the patch and the bottom formed the ground. The size of the patch was 8 mm × 7 mm. The prototype of the absorber consisted of two unit cells such that it fits into the WR-90 waveguide (dimensions: 22.86 mm × 10.16 mm) for experimental measurement. Before stretching the absorber, the resonant frequency was 11 GHz. When stretched along the x-direction, the resonant frequency shifted by 0.1 GHz, from 11 to 10.9 GHz, demonstrating 99% absorption. Furthermore, when stretched along the y-direction, the resonant frequency shifted by 0.6 GHz, from 11 to 10.4 GHz, demonstrating 99% absorption.