Utilization of Meander Line Slots for Enhancing the WPT Efficiency and Transmission Range

In this paper, a wideband-narrowband switchable tapered slot antenna (TSA) with a compact meander line resonator for an integrated microwave imaging and hyperthermia system was proposed. A compact meander line resonator, which exhibited band-pass characteristics and provided narrowband characteristics by using one PIN diode, was fabricated beneath the tapered slot of the wideband TSA to minimize the degradation of the wideband characteristics. Moreover, the electromagnetic energy was transferred to the meander line resonator with a coupling effect to ensure effective frequency switching. By adapting a PIN diode on the meander line resonator, frequency switching could be achieved. In this way, the proposed antenna could operate in a real-time frequency switching mode between the ultra-wideband (UWB; 3.1~10 GHz), which is used for microwave imaging, and the 2.45 GHz band (industrial, scientific, and medical, ISM band), which is used for microwave hyperthermia. Frequency and time-domain results proved the applicability of the proposed antenna to an integrated breast cancer detection and treatment system.

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Ultra-miniaturized DGS-based Meander Line Multi-band Filters with/without Resonators for Satellite Band Applications

Journal of The Institution of Engineers (India) Series B ◽

10.1007/s40031-021-00625-2 ◽

2021 ◽

Author(s):

S. Oudaya coumar

Keyword(s):

Meander Line ◽

Multi Band

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Visual Comfort Analysis of Semi-Transparent Perovskite Based Building Integrated Photovoltaic Window for Hot Desert Climate (Riyadh, Saudi Arabia)

Energies ◽

10.3390/en14041043 ◽

2021 ◽

Vol 14 (4) ◽

pp. 1043 ◽

Cited By ~ 1

Author(s):

Aritra Ghosh ◽

Abdelhakim Mesloub ◽

Mabrouk Touahmia ◽

Meriem Ajmi

Keyword(s):

Saudi Arabia ◽

Cognitive Performance ◽

Office Building ◽

Transmission Range ◽

Transmission Spectra ◽

Visual Comfort ◽

Building Integrated Photovoltaic ◽

Transparent Windows ◽

Desert Climate

Buildings consume considerable amount of energy to maintain comfortable interior. By allowing daylight, visual comfort inside a building is possible which can enhance the occupant’s health, mood and cognitive performance. However, traditional highly transparent windows should be replaced with semitransparent type window to attain a comfortable daylight inside a building. Evaluation of visual comfort includes both daylight glare and colour comfort analysis. Building integrated photovoltaic (BIPV) type windows are promising systems and can possess a range of semitransparent levels depending on the type of PV used. In this work, the semitransparent Perovskite BIPV windows was investigated by employing daylight glare analysis for an office building located in Riyadh, KSA and three wavelength dependent transmission spectra for colour comfort analysis. The results showed that the transmissions range between 50–70% was optimum for the comfortable daylight for south facing vertical pane BPV-windows. However, excellent colour comfort was attained for the transmission range of 90% which provided glare issues. Colour comfort for 20% transparent Perovskite was compared with contemporary other type of PV which clearly indicated that wavelength dependent transmittance is stronger over single value transmittance.

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Study on an X-Band Sheet Beam Meander-Line SWS

IEEE Transactions on Plasma Science ◽

10.1109/tps.2020.3035411 ◽

2020 ◽

Vol 48 (12) ◽

pp. 4149-4154

Author(s):

Zhanliang Wang ◽

Feifei Du ◽

Shifeng Li ◽

Qiang Hu ◽

Zhaoyun Duan ◽

...

Keyword(s):

X Band ◽

Meander Line

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Realization of frequency hopping characteristics of an epsilon negative metamaterial with high effective medium ratio for multiband microwave applications

Scientific Reports ◽

10.1038/s41598-021-96228-4 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Mohammad Tariqul Islam ◽

Md. Moniruzzaman ◽

Touhidul Alam ◽

Md Samsuzzaman ◽

Qutaiba A. Razouqi ◽

...

Keyword(s):

Refractive Index ◽

Low Cost ◽

Frequency Hopping ◽

Small Dimension ◽

Effective Medium ◽

Unit Cell ◽

Negative Permittivity ◽

Design System ◽

Microwave Applications ◽

Meander Line

AbstractIn this paper, a meander-lines-based epsilon negative (ENG) metamaterial (MTM) with a high effective medium ratio (EMR) and near-zero refractive index (NZI) is designed and investigated for multiband microwave applications. The metamaterial unit cell is a modification of the conventional square split-ring resonator in which the meander line concept is utilized. The meander line helps to increase the electrical length of the rings and provides strong multiple resonances within a small dimension. The unit cell of proposed MTM is initiated on a low-cost FR4 substrate of 1.5 mm thick and electrical dimension of 0.06λ × 0.06λ, where wavelength, λ is calculated at the lowest resonance frequency (2.48 GHz). The MTM provides four major resonances of transmission coefficient (S21) at 2.48, 4.28, 9.36, and 13.7 GHz covering S, C, X, and Ku bands. It shows negative permittivity, near-zero permeability, and near-zero refractive index in the vicinity of these resonances. The equivalent circuit is designed and modeled in Advanced Design System (ADS) software. The simulated S21 of the MTM unit cell is compared with the measured one and both show close similarity. The array performance of the MTM is also evaluated by using 2 × 2, 4 × 4, and 8 × 8 arrays that show close resemblance with the unit cell. The MTM offers a high effective medium ratio (EMR) of 15.1, indicating the design's compactness. The frequency hopping characteristics of the proposed MTM is investigated by open and short-circuited the three outer rings split gaps by using three switches. Eight different combinations of the switching states provide eight different sets of multiband resonances within 2–18 GHz; those give the flexibility of using the proposed MTM operating in various frequency bands. For its small dimension, NZI, high EMR, and frequency hopping characteristics through switching, this metamaterial can be utilized for multiband microwave applications, especially to enhance the gain of multiband antennas.

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