Broadband, large-numerical-aperture and high-efficiency microwave metalens by using a double-layer transmissive metasurface

2021 ◽  
Author(s):  
Yong-Qiang Liu ◽  
Zhongru Ren ◽  
Yingchao Shu ◽  
Lujun Wu ◽  
Jinhai Sun ◽  
...  
Keyword(s):  
High Efficiency ◽  
Low Cost ◽  
Numerical Aperture ◽  
Modern Science ◽  
Frequency Range ◽  
Phase Gradient ◽  
Low Profile ◽  
Microwave Components ◽  
Measurement Results ◽  
Sub Wavelength

Abstract Broadband metalenses consist of sub-wavelength phase gradient elements are indispensable in modern science and technology. So far, several broadband optical metalenses are demonstrated but mostly with either small NA or relatively low focusing efficiency. Herein, an ultra-thin broadband microwave metalens (frequency range from 8.0GHz to 10.5GHz) with both high-efficiency above 40% and large NA more than 0.6 is presented. The metalens is also fabricated and the measurement results agree with the simulations very well. The performances of the presented broadband metalens can surpass nowadays microwave metalens largely and open up new vistas for low-profile, low-cost and light-weight microwave components.

scholarly journals Low-Cost, Low-Profile Wide-Band Radar Cross Section Reduction Using Dual-Concentric Phase Gradient Modulated Surface

Electronics ◽  
2021 ◽  
Vol 10 (13) ◽  
pp. 1552
Author(s):  
Yousef Azizi ◽  
Mohammad Soleimani ◽  
Seyed Hasan Sedighy ◽  
Ladislau Matekovits
Keyword(s):  
Cross Section ◽  
Low Cost ◽  
Wide Band ◽  
Radar Cross Section ◽  
Phase Gradient ◽  
Full Wave ◽  
Low Profile ◽  
Anomalous Reflection ◽  
Measurement Results ◽  
Unit Cells

Design criteria of low-cost, dual-concentric metasurface possessing wideband phase gradient (PG) are introduced. The radar cross-section reduction (RCSR) is explained by anomalous reflection that characterizes the superficial planar. The geometry consists of two single band RCSR modulated surfaces (MSs) that are triggered in each other. Each MS is built-up of square patch (SP) unit cells configured as a modulation structure to realize PG that causes anomalous reflection and monostatic RCSR behavior. Applying sinusoidal modulation to the sequence of the SP unit cells leads to the formation of PG along the surface and hence the intensity of the reflected wave is reduced for the broadside direction (θr=0∘). The proposed structure fabricated on a 0.8 mm thin FR-4 substrate extends over 249 × 249 mm2. It achieves a wide RCSR bandwidth from 20.9 GHz to 45.7 GHz (i.e., relative bandwidth of 75%) as designed in Dassault Systèmes (CST) Microwave Studio as a full-wave simulator and confirmed by the measurement results.

scholarly journals Design and Analysis of a Photonic Crystal Based Planar Antenna for THz Applications

Electronics ◽  
2021 ◽  
Vol 10 (16) ◽  
pp. 1941
Author(s):  
Inzamam Ahmad ◽  
Sadiq Ullah ◽  
Shakir Ullah ◽  
Usman Habib ◽  
Sarosh Ahmad ◽  
...  
Keyword(s):  
Communication Systems ◽  
High Speed ◽  
Low Cost ◽  
High Gain ◽  
Propagation Loss ◽  
Smart Devices ◽  
Frequency Range ◽  
Low Profile ◽  
Unit Cells ◽  
Thz Applications

Modern advancements in wearable smart devices and ultra-high-speed terahertz (THz) communication systems require low cost, low profile, and highly efficient antenna design with high directionality to address the propagation loss at the THz range. For this purpose, a novel shape, high gain antenna for THz frequency range applications is presented in this work. The proposed antenna is based on a photonic bandgap (PBG)-based crystal polyimide substrate which gives optimum performance in terms of gain (9.45 dB), directivity (9.99 dBi), and highly satisfactory VSWR (<1) at 0.63 THz. The performance of the antenna is studied on PBGs of different geometrical configurations and the results are compared with the antenna based on the homogeneous polyimide-based substrate. The effects of variations in the dimensions of the PBG unit cells are also studied to achieve a −10 dB bandwidth of 28.97 GHz (0.616 to 0.64 THz).

scholarly journals A Low-Profile Antenna Based on Single-Layer Metasurface for Ku-Band Applications

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Yadgar I. Abdulkarim ◽  
Halgurd N. Awl ◽  
Fahmi F. Muhammadsharif ◽  
Muharrem Karaaslan ◽  
Rashad H. Mahmud ◽  
...  
Keyword(s):  
Computer Simulation ◽  
Single Layer ◽  
Satellite Communications ◽  
Antenna Gain ◽  
Frequency Range ◽  
Low Profile ◽  
Operating Frequency Range ◽  
Measurement Results ◽  
Good Agreement ◽  
Ku Band

Improvement in the antenna gain is usually achieved at the expense of bandwidth and vice versa. This is where the realization of this enhancement can be made through compromising the antenna profile. In this work, we propose a new design of incorporating periodic metasurface array to enhance the bandwidth and gain while keeping the antenna to a low-profile scheme. The proposed antenna was simulated and fabricated in order to validate the results in the operating frequency range from 10 MHz to 43.5 GHz. Computer simulation technology (CST) microwave studio software was used to design and simulate the proposed antenna, while LPKF prototyping PCB machine was utilized to fabricate the antenna. Results showed that the antenna generated a gain and bandwidth of 14.2 dB and 2.13 GHz, respectively. Following the good agreement between the numerical and measurement results, it is believed that the proposed antenna can be potentially attractive for the application of satellite communications in Ku-band electromagnetic wave.

scholarly journals Miniaturized Printed Inverted-F Antenna for Internet of Things: A Design on PCB with a Meandering Line and Shorting Strip

2018 ◽  
Vol 2018 ◽  
pp. 1-5 ◽  
Author(s):  
Cheuk Yin Cheung ◽  
Joseph S. M. Yuen ◽  
Steve W. Y. Mung
Keyword(s):  
Internet Of Things ◽  
Printed Circuit Board ◽  
Low Cost ◽  
Circuit Board ◽  
Ism Band ◽  
Printed Circuit ◽  
Iot Applications ◽  
Low Profile ◽  
Measurement Results

This paper focuses on a printed inverted-F antenna (PIFA) with meandering line and meandering shorting strip under 2.4 GHz industrial, scientific, and medical (ISM) band for Internet of things (IoT) applications. Bluetooth Low Energy (BLE) technology is one of potential platforms and technologies for IoT applications under ISM band. Printed circuit board (PCB) antenna commonly used in commercial and medical applications because of its small size, low profile, and low cost compared to low temperature cofired ceramic (LTCC) technology. The proposed structure of PIFA is implemented on PCB to gain all these advantages. Replacing conventional PCB line in PIFA by the meandering line and meandering shorting strip improves the efficiency of the PIFA as well as the bandwidth. As a case study, design and measurement results of the proposed PIFA are presented.

Low Profile, Low Cost and High Efficiency Phased Array

2006 ◽  
Author(s):  
Jiang Yonghua ◽  
Hao Yuan ◽  
Tang Zhikai ◽  
Liu Longhe ◽  
Ling Xiang
Keyword(s):  
Phased Array ◽  
High Efficiency ◽  
Low Cost ◽  
Low Profile

scholarly journals A New Design of a CPW-Fed Dual-Band Monopole Antenna for RFID Readers

2018 ◽  
Vol 8 (2) ◽  
pp. 1040
Author(s):  
Ahmed El Hamraoui ◽  
EL Hassane Abdelmounim ◽  
Jamal Zbitou ◽  
Hamid Bennis ◽  
Mohamed Latrach
Keyword(s):  
Low Cost ◽  
Coplanar Waveguide ◽  
Monopole Antenna ◽  
Antenna Design ◽  
Dual Band ◽  
Critical Parameters ◽  
Antenna Structure ◽  
Low Profile ◽  
Measurement Results ◽  
Rfid Readers

<p>This paper comes with a new dual-band planar monopole antenna fed by Coplanar Waveguide (CPW) line designed for RFID readers and it operates at 2.45 GHz, 5.80 GHz. This antenna is designed with reasonable gain, low profile and low cost production. The designed antenna based on theoretical equations is simulated and validated by using ADS from Agilent technologies and CST Microwave Studio electromagnetic solvers. A parametric study of the proposed antenna has been carried out by optimizing some critical parameters. The antenna has a total area of 35×38 mm2 and mounted on an FR4 substrate with dielectric permittivity constant 4.4 and thickness of 1.6 mm and loss tangent 0.025. The comparison between simulation and measurement results permits to validate the final achieved antenna structure in the desired RFID frequencies bands. Details of the proposed antenna design and both simulated and experimental results are described and discussed</p>

scholarly journals A Compact Low-Profile High Isolation MIMO Antenna For X-Band Applications

2021 ◽  
Author(s):  
Akanksha Singh ◽  
Arvind Kumar ◽  
Binod Kumar Kanaujia
Keyword(s):  
Mutual Coupling ◽  
Frequency Range ◽  
Entire Frequency Range ◽  
Mimo Antenna ◽  
High Isolation ◽  
Feed Line ◽  
Low Profile ◽  
X Band ◽  
Measurement Results ◽  
Meander Line

Abstract A novel compact low profile MIMO antenna is designed and implemented with high isolation for the X band applications. Proposed MIMO geometry is incorporated with two monopoles which are excited by 50 Ω feed line. To enhance the isolation between inter-elements meander line structures are is identically placed. These meander line structures are reducing the mutual coupling up to 26 dB. In the proposed MIMO antenna two elements cover the entire frequency range between 7.4-11.8 GHz for the X band applications. Meander line structure is working as a decoupling network which improves the isolation considerably. The overall size of the MIMO antenna is 25 × 30 × 1 mm3, and it offers inter-element isolation of >26 dB, envelope correlation coefficient is less than 0.2, and directivity gain >9.99 over the resonating frequency range. The proposed MIMO antenna model is fabricated, and measurement results are verified with simulated results. The antenna shows the satisfactory gain of around 4.8 dB in entire frequency range. The antenna shows the satisfactory gain of around 4.5 dB in entire frequency range.

scholarly journals Performance Analysis of Pentagon Shaped Microstrip Patch Antenna with Different Substrate Materials

2019 ◽  
Vol 8 (2) ◽  
pp. 1062-1066
Keyword(s):  
Patch Antenna ◽  
High Efficiency ◽  
Low Cost ◽  
Space Vehicles ◽  
Patch Antennas ◽  
Microstrip Patch ◽  
Low Dielectric ◽  
Planar Structures ◽  
Low Profile ◽  
Easy Integration

Microstrip patch antennas are the handiest antennas for the present trend of applications in communications. The well-known beneficial mechanical characteristics (low profile, light weight, planar but conformal to non-planar structures, easy to fabricate), flexibility in terms of electromagnetic parameters like radiation pattern, gain, impedance, polarization and low cost are the key features for the success of such antennas. High efficiency antennas are essential to cater the requirements of various military oriented space vehicles like spacecraft, aircraft, satellite and missile applications where dimensions of installation are important as size, weight, performance, ease of installation and easy integration to the circuit. Microstrip antenna array are most apt for such applications, but the limitation of such antennas are gain and the bandwidth. The order of gain is low for patch antenna which is generally in the choice of 1-2dB.To increase gain and bandwidth factors the utilization of material with low dielectric constant having greater thickness is employed. However, this generates surface waves. So, proper thickness of substrate is selected. In this paper, microstrip patch having pentagon shape uses probe feed technique for various substrate materials such as Roger’s RT/Duroid 5880 (tm), Roger’s RO4003 (tm) and FR4 epoxy. The results of the three substrate designs are acquired for the resonant frequencies 6.5 GHz, 6.6 GHz, and 6.7 GHz respectively. The whole analysis is carried out using Ansoft HFSS software version 17.0. The characteristics like bandwidth, amplification factor (gain), return loss and radiation patterns of the different antenna are assessed, related and the same are presented at the end.

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