Ultra-thin narrow-band, complementary narrow-band, and dual-band metamaterial absorbers for applications in the THz regime

2017 ◽  
Vol 121 (6) ◽  
pp. 063103 ◽  
Author(s):  
Maria Denise Astorino ◽  
Fabrizio Frezza ◽  
Nicola Tedeschi
Keyword(s):  
Narrow Band ◽  
Dual Band ◽  
Metamaterial Absorbers

Frequency reconfigurable antenna for cognitive radios with sequential UWB mode of perception and multiband mode of operation

2018 ◽  
Vol 10 (9) ◽  
pp. 1096-1102 ◽  
Author(s):  
Ali Mansoul ◽  
Farid Ghanem
Keyword(s):  
Narrow Band ◽  
Cognitive Radios ◽  
Dual Band ◽  
Uwb Antenna ◽  
Switch Operation ◽  
Resonance Frequencies ◽  
Mode Of Operation ◽  
The Mean ◽  
Conductive Strip ◽  
Good Agreement

AbstractIn this work, an UWB/narrow band reconfigurable elliptical-shaped monopole antenna for cognitive radio applications with sequential perception and operation modes is presented. The proposed approach consists in integrating a reconfigurable filter, in an UWB antenna ground plan, by the mean of four horizontal slots and integrated switches that allow inserting/removing/varying zeros and poles in the frequency response. By acting on the slot lengths in order to alter their resonance frequencies, the different switch configurations allow the antenna to switch between an UWB mode that could be used for the perception (sensing) and different narrowband modes, mono-band and dual-band, that could be used for the operation at 2.4 or/and 3.5 GHz. To validate the concept, an experimental prototype has been fabricated and a good agreement between the simulated and the measured S-parameters has been obtained. While the presented work uses the presence/absence of a perfect conductive strip (PEC) to model real switch operation, it is believed that the obtained results conjugated with previous work using real switches on a very similar structure allows validating approach.

scholarly journals Right-Angle Shaped Elements as Dual-Band Metamaterial Absorber in Terahertz

2019 ◽  
Vol 10 (3) ◽  
pp. 233-241
Author(s):  
Salman Daniel ◽  
Prince Bawuah
Keyword(s):  
Electromagnetic Wave ◽  
Numerical Simulations ◽  
Metamaterial Absorber ◽  
Terahertz Range ◽  
Dual Band ◽  
Angle Of Incidence ◽  
Wide Range ◽  
State Of Polarization ◽  
Potential Applications ◽  
Metamaterial Absorbers

AbstractMetamaterial absorbers display potential applications in the field of photonics and have been investigated extensively during the last decade. We propose a dual-band resonant metamaterial absorber with right-angle shaped elements (RAEs) in the terahertz range based on numerical simulations. The absorber remains insensitive to a wide range of incidence angles (0°–70°) by showing a minimum absorbance of ~80% at 70°. Furthermore, the proposed absorber is highly independent on any state of polarization of the incidence electromagnetic wave due to the high absorbance, i.e., greater than 80%, recorded for the considered polarization states. To further comprehend the slight variations in absorbance as a function of change in the angle of incidence, the impedance of the structure has been critically examined. The metamaterial absorber is simple in design, and we provide a possible path of fabrication.

Single and dual band 77/95/110 GHz metamaterial absorbers on flexible polyimide substrate

2011 ◽  
Vol 99 (26) ◽  
pp. 264101 ◽  
Author(s):  
Pramod K. Singh ◽  
Konstantin A. Korolev ◽  
Mohammed N. Afsar ◽  
Sameer Sonkusale
Keyword(s):  
Dual Band ◽  
Polyimide Substrate ◽  
Metamaterial Absorbers

scholarly journals Design and Fabrication of Metamaterial Absorbers Used for RF-ID

2020 ◽  
Vol 58 (2) ◽  
pp. 131-136 ◽  
Author(s):  
Yo-Han Ryu ◽  
Sung-Soo Kim
Keyword(s):  
Reflection Loss ◽  
Radio Frequency Identification ◽  
Electromagnetic Interference ◽  
Electromagnetic Compatibility ◽  
Incidence Angle ◽  
Copper Film ◽  
Circuit Board ◽  
Dual Band ◽  
Substrate Thickness ◽  
Metamaterial Absorbers

Radio frequency identification (RF-ID) uses electromagnetic fields to automatically identify and track tags attached to objects. In response to the need to suppress the electromagnetic interference between adjacent RF-ID equipment or systems, this study aims to achieve a thin and multi-resonance absorber using metamaterials composed of patterned grids on a grounded dielectric substrate in the frequency region of UHF and microwaves. A computational tool (ANSYS HFSS) was used to model and estimate the reflection coefficient and surface current distribution. The samples used to measure reflection loss were fabricated by the printed circuit board (PCB) method in which a copper film was deposited on both sides of a photosensitized board. The reflection loss was measured using a free space measurement system, composed of a pair of horn antennas and network analyzer. The grid-patterned metamaterial absorbers exhibited dual-band absorption peaks at 0.88 GHz and 2.45 GHz with a small substrate thickness (about 3.7 mm) that can be usefully applied to electromagnetic compatibility in RF-ID system. Magnetic coupling is achieved via antiparallel currents in the grid conductor on the top layer and the ground conductor on the bottom layer. Since the magnetic response is influenced by the dimension of the resonators, it is possible to achieve two resonances by scaling the resonating structures. The metamaterial absorbers also exhibited good oblique incidence performance. A high level of absorption (above 10 dB) was maintained at up to 30 degrees of incidence angle for both TE and TM polarization.

Compact Bandpass Filters Using Folded Quad-Mode Stub-Loaded Loop Resonators

2020 ◽  
Vol 35 (10) ◽  
pp. 1217-1221
Author(s):  
Chen Liang ◽  
Yun Liu ◽  
Fanbin Tai
Keyword(s):  
Bandpass Filter ◽  
Narrow Band ◽  
Bandpass Filters ◽  
Single Band ◽  
Dual Band ◽  
Resonant Frequencies ◽  
Input And Output ◽  
Mode Method ◽  
Medium Band ◽  
Equal Space

Folded quad-mode stub-loaded loop resonators (QMSLLRs) are proposed for realizing both bandpass and dual-band bandpass filters with compact dimensions. The QMSLLR is a folded square loop loaded with four short stubs, providing structure symmetry in both transversal and longitudinal directions. Determined by the lengths of the loaded stubs, the four resonant frequencies as analyzed with even-odd mode method can be either distributed in one passband with equal space, or in two passbands with a guard band in between, for realizing a single-band bandpass filter or a dual-band bandpass filter, respectively. For both the input and output couplings, two perpendicular feeding lines are parallel coupled to the QMSLLR at one corner. The measure results prove that the structure is suitable for the design of a medium band or even narrow band bandpass filters with compact dimensions.

scholarly journals Design of Miniaturized Multiband Filters Using Zero Order Resonators for WLAN Applications

2015 ◽  
Vol 2015 ◽  
pp. 1-7
Author(s):  
Maryam Shafiee ◽  
Mohammad Amin Chaychi Zadeh ◽  
Homayoon Oraizi
Keyword(s):  
Least Squares ◽  
Equivalent Circuit ◽  
Narrow Band ◽  
Equivalent Circuit Model ◽  
Circuit Model ◽  
Zero Order ◽  
Dual Band ◽  
Method Of Least Squares ◽  
Band Filter ◽  
Narrow Band Filter

The objective of this paper is to design miniaturized narrow- and dual-band filters for WLAN application using zero order resonators by the method of least squares. The miniaturization of the narrow-band filter is up to 70% and that of the dual-band filter is up to 64% compared to the available models in the literature. Two prototype models of the narrow-band and dual-band filters are fabricated and measured, which verify the proposed structure for the filter and its design by the presented method, using an equivalent circuit model.

Synthesis and design of SIW dual-band narrow-band bandstop filter

2020 ◽  
Vol 40 (5) ◽  
pp. 303-312
Author(s):  
Fei Cheng ◽  
Xuan-Tan Li ◽  
Ping Lu ◽  
Kama Huang
Keyword(s):  
Narrow Band ◽  
Dual Band ◽  
Bandstop Filter
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