scholarly journals Ultra-Wideband and Wide-Angle Microwave Metamaterial Absorber

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2045 ◽  
Author(s):  
Xavier Begaud ◽  
Anne Lepage ◽  
Stefan Varault ◽  
Michel Soiron ◽  
André Barka
Keyword(s):  
Reflection Coefficient ◽  
Impedance Matching ◽  
Normal Incidence ◽  
Multilayered Structure ◽  
Metamaterial Absorber ◽  
Ultra Wideband ◽  
Wide Angle ◽  
Total Thickness ◽  
Dielectric Layers ◽  
Absorbing Materials

In order to extend the performance of radar absorbing materials, it is necessary to design new structures with wideband properties and large angles of incidence which are also as thin as possible. The objective of this work, realized within the framework of the SAFAS project (self-complementary surface with low signature) is, then, the development of an ultra-wideband microwave absorber of low thickness. The design of such material requires a multilayered structure composed with dielectric layers, metasurfaces, and wide-angle impedance matching layers. This solution has been realized with on-the-shelf materials, and measured to validate the concept. At normal incidence, the bandwidth ratio, defined for a magnitude of the reflection coefficient below −10 dB, is 4.7:1 for an absorber with a total thickness of 11.5 mm, which corresponds to λ/7 at the lowest operating frequency. For an incidence of 60°, this bandwidth ratio is reduced to 3.8:1, but the device remains ultra-wideband.

Selectivity and in-band impedance enhancement of a compact slot antenna with defected ground structures

2019 ◽  
Vol 11 (10) ◽  
pp. 1010-1016
Author(s):  
Hailong Yang ◽  
Xiaoli Xi ◽  
Lili Wang ◽  
Yuchen Zhao ◽  
Xiaomin Shi
Keyword(s):  
Reflection Coefficient ◽  
Impedance Matching ◽  
Ultra Wideband ◽  
Band Edge ◽  
Slot Antenna ◽  
Defected Ground Structure ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Uwb Antennas ◽  
Low Pass

AbstractIn this study, a new ultra-wideband (UWB) band-edge selectivity antenna with a modified radiation slot using defected ground structure (DGS) is presented to obtain bandpass filtering reflection coefficient and gain performance. The well-designed DGS is designed on backside metallic of the substrate and can be seen as a low-pass filter that provides a good roll-off at a higher frequency. By connecting the DGS and the stepped slot and making them merge with each other, good cut-off property in the upper passband and better in-band impedance characteristics are obtained. Measured results show that the proposed design not only shows good band-edge selectivity in reflection coefficient and gain performance but also has a good impedance matching of −13.5 dB reflection coefficients and a good radiation efficiency of 90% in the operating frequencies. The measured bandwidth defined with the reflection coefficient less than −10 dB is from 3.1–11.2 GHz. Furthermore, the size of the filtering UWB antenna is 22 mm × 12 mm, which is smaller than many individual UWB antennas and UWB filters.

A wide-angle and ultra-wideband metamaterial absorber based on a cascaded graphite involute windmill blade structure

2020 ◽  
Author(s):  
CaiXing Hu ◽  
XingLiang Tian ◽  
Ziwei Zhou ◽  
Dan Zhang ◽  
Hai-Feng Zhang
Keyword(s):  
Metamaterial Absorber ◽  
Ultra Wideband ◽  
Wide Angle

An ultra-wideband and wide-angle optically transparent flexible microwave metamaterial absorber

2021 ◽  
Vol 54 (27) ◽  
pp. 275101
Author(s):  
Yufan Zhao ◽  
Shuying Li ◽  
Yuying Jiang ◽  
Changqing Gu ◽  
Liangliang Liu ◽  
...  
Keyword(s):  
Metamaterial Absorber ◽  
Ultra Wideband ◽  
Wide Angle ◽  
Optically Transparent

scholarly journals Oblique Wide-Angle Multi-Sector Metamaterial Absorber for Space Applications

2019 ◽  
Vol 9 (16) ◽  
pp. 3425 ◽  
Author(s):  
Olivier Rance ◽  
Anne Claire Lepage ◽  
Xavier Begaud ◽  
Kevin Elis ◽  
Nicolas Capet
Keyword(s):  
Reflection Coefficient ◽  
Frequency Band ◽  
Oblique Incidence ◽  
Metamaterial Absorber ◽  
Wide Angle ◽  
Space Applications ◽  
Specific Measurement ◽  
Measurement Results ◽  
Absorbing Material

This article presents the design, realization and measurement of lightweight absorbing material for space applications. The electromagnetic absorber, operating on the [2 GHz, 2.3 GHz] frequency band, is designed for oblique incidence ranging from 35° to 65°. Wide-angle designs are demonstrated to be particularly challenging at oblique incidence and an approach consisting in dividing the surface in two different sectors with respect to the incoming angle is proposed. A specific measurement setup is presented in order to characterize this new kind of evolutive absorber. The measurement results show that the sectorial absorber achieves a reflection coefficient inferior to −11.5 dB, corresponding to an absorptivity above 0.965 on the frequency band [2 GHz, 2.3 GHz] for both TE and TM polarizations for angles of incidence varying from 35° to 65°.

Experimental verification of super-compact ultra-wideband (UWB) polarization and incident angle-independent metamaterial absorber

2020 ◽  
pp. 1-11
Author(s):  
Manpreet Kaur ◽  
Hari Shankar Singh
Keyword(s):  
Incident Angle ◽  
Low Cost ◽  
Surface Current ◽  
Cost Effective ◽  
Normal Incidence ◽  
Metamaterial Absorber ◽  
Capacitive Coupling ◽  
Ultra Wideband ◽  
Absorption Mechanism ◽  
The Stability

Abstract In this paper, a super-compact ultra-wideband (UWB) metamaterial absorber (MMA) is presented. The absorber design consists of an inverted L-shaped structure and a diagonal rectangular-shaped structure. The capacitive coupling between these two structures not only provides UWB nature but also provides a super-compact absorber design. The dimension of the unit cell arrangement is 5 × 5 mm2 and printed on a low-cost FR-4 substrate of thickness 1.54 mm (0.061λlowest). The design absorber provides more than 97% absorptivity from 12 to 21 GHz for normal incidence electromagnetic (EM) wave. However, the proposed MMA has a full width at half maximum absorption bandwidth of 11.71 GHz from 10.34 to 22.05 GHz. Moreover, the surface current distributions have been analyzed to understand the absorption mechanism of the MMA. The stability of the proposed design is validated with different incident angles (for TE and TM modes) and different polarization angles. Finally, the absorber design is fabricated and verified experimentally. Furthermore, the UWB frequency range, high absorption, ease in design and fabrication, and cost-effective make it suitable for different quality applications in stealth technology, thermal imaging, radar detection, antenna systems, and other EM devices.

scholarly journals Conceptual-based design of an ultrabroadband microwave metamaterial absorber

2021 ◽  
Vol 118 (36) ◽  
pp. e2110490118
Author(s):  
Sichao Qu ◽  
Yuxiao Hou ◽  
Ping Sheng
Keyword(s):  
Incident Wave ◽  
Impedance Matching ◽  
Hierarchical Structures ◽  
Normal Incidence ◽  
Metamaterial Absorber ◽  
Wave Direction ◽  
Minimum Thickness ◽  
Lateral Plane ◽  
Metallic Ring ◽  
Microwave Regime

By introducing metallic ring structural dipole resonances in the microwave regime, we have designed and realized a metamaterial absorber with hierarchical structures that can display an averaged −19.4 dB reflection loss (∼99% absorption) from 3 to 40 GHz. The measured performance is independent of the polarizations of the incident wave at normal incidence, while absorption at oblique incidence remains considerably effective up to 45°. We provide a conceptual basis for our absorber design based on the capacitive-coupled electrical dipole resonances in the lateral plane, coupled to the standing wave along the incident wave direction. To realize broadband impedance matching, resistive dissipation of the metallic ring is optimally tuned by using the approach of dispersion engineering. To further extend the absorption spectrum to an ultrabroadband range, we employ a double-layer self-similar structure in conjunction with the absorption of the diffracted waves at the higher end of the frequency spectrum. The overall thickness of the final sample is 14.2 mm, only 5% over the theoretical minimum thickness dictated by the causality limit.

A 3–14 GHz, Self-Body Biased Common-Gate UWB LNA for Wireless Applications in 90 nm CMOS

2019 ◽  
Vol 28 (04) ◽  
pp. 1950056 ◽  
Author(s):  
Vikram Singh ◽  
Sandeep Kumar Arya ◽  
Manoj Kumar
Keyword(s):  
Reflection Coefficient ◽  
Noise Figure ◽  
Impedance Matching ◽  
Low Noise ◽  
Ultra Wideband ◽  
Common Source ◽  
Cmos Process ◽  
Frequency Range ◽  
Continuous Growth ◽  
Common Gate

Inspired from continuous growth in the field of low power and low noise wireless communication devices, a low noise amplifier (LNA) using self-body biased common-gate (CG) configuration is presented in this paper. The proposed LNA is designed for 3–14[Formula: see text]GHz ultra-wideband (UWB) frequency range using 90[Formula: see text]nm CMOS process. Common-gate configuration with self-body biasing has been used at the input stage to provide wideband input matching with low noise figure (NF) for the complete UWB frequency. An impedance matching network consisting of parallel to series RLC network has been used between common-gate and cascaded common source (CS) stages. Two stages of the CS configuration have been used for bandwidth enhancement and to increase the power gain (S[Formula: see text]) with acceptable NF. Buffer stage at the output has been used to achieve output reflection coefficient (S[Formula: see text]) less than [Formula: see text]10.8[Formula: see text]dB. The proposed LNA achieves an average S[Formula: see text] of 15.9[Formula: see text][Formula: see text][Formula: see text]0.7[Formula: see text]dB with a maximum of 16.7[Formula: see text]dB at 3.0[Formula: see text]GHz and NF of 1.68–2.7[Formula: see text]dB for 3.1–10.6[Formula: see text]GHz UWB frequency range. It provides input reflection coefficient (S[Formula: see text]) less than [Formula: see text]10.2[Formula: see text]dB, reverse isolation (S[Formula: see text]) less than [Formula: see text]75.8[Formula: see text]dB and a NF of 1.68–4.0[Formula: see text]dB throughout the proposed UWB frequency range. The proposed LNA provides input 1[Formula: see text]dB compression point (P1dB) of [Formula: see text]13[Formula: see text]dBm and input third-order intercept point (IIP3) of [Formula: see text]8[Formula: see text]dBm at 6[Formula: see text]GHz. It consumes 20.1[Formula: see text]mW of power from a 1.2[Formula: see text]V power supply.

A Wideband and Wide Scanning Tightly Coupled Dipole Array with Meta-Surface Wide-Angle Impedance Matching

2021 ◽  
Vol 36 (7) ◽  
pp. 872-878
Author(s):  
Yuan Ye ◽  
Zhao Huang ◽  
Yun Jiang ◽  
Li-an Bian ◽  
Chang Zhu ◽  
...  
Keyword(s):  
Antenna Array ◽  
Massive Mimo ◽  
Low Cost ◽  
Impedance Matching ◽  
Ultra Wideband ◽  
Wide Angle ◽  
Scanning Angle ◽  
Low Profile ◽  
Tightly Coupled ◽  
Mimo Beamforming

A low profile ultra-wideband tightly coupled dipole array is studied. The antenna elements are fed by Marchand baluns of small size and low cost. A metasurface based wide-angle impedance matching (MSWAIM) layer is introduced to replace the traditional dielectric WAIM, improving the beam scan performance and reducing the antenna profile. The simulation shows that the proposed antenna array can operate over 2.4-12.4 GHz, approximately 5:1 bandwidth with maximum scanning angle of 50o for both E plane and 45o for H plane. The antenna profile above the ground is only 0.578λH at the highest operating frequency. This antenna array can find its application in the forthcoming massive MIMO beamforming systems for 5G.

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