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World's First Metamaterial Detects Structural Cracks via Ultrasound

World's First Metamaterial Detects Structural Cracks via Ultrasound
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Soult Ukpyolsi , South Korea , Yoon Young Kim , College Of Engineering Dean Yoo Seok Hong , Ministry Of Science , Global Phd Fellowship Program , Nature Communications , Ministry Of Education , Senior Researcher Min Woo Kweun , Nano Devices , Korea Institute , President Seok Hyun Ryu , Distinguished Professor Yoon Young Kim , Mechanical Engineering , Seoul National University , Dean Yoo Seok Hong , Circular Polarization , Elastic Waves , Researcher Min Woo Kweun , Frontier Project , Phd Fellowship ,

"A Wideband Circularly Polarized CPW-Fed Printed Monopole X-Band Antenn" by Mohamed El Hammoumi, Faisel Tubbal et al.

This paper presents a novel wideband circularly polarized CPW-fed printed monopole antenna for CubeSat applications. An AMC reflector with 5× 5 -unit cells is used to increase antenna gain. The overall size of the antenna is 0.48λ 0 × 0.48λ 0 × 0.042λ 0 at the operating frequency of 8-GHz. The proposed printed monopole antenna provides a wide impedance bandwidth and a wide 3-dB axial ratio bandwidth. When comparing our proposed antenna to all designs, it is evident that the proposed printed monopole antenna offers several advantages. Firstly, it exhibits higher gain and a wider 3-dB axial ratio bandwidth (ARBW) while maintaining a smaller physical size. More specifically, the measured results show a wide -10 dB impedance bandwidth of 97.5% (6.1-13.9 GHz), and a wide measured 3-dB axial ratio bandwidth of 98.75% (5.1-13 GHz) and total measured gain of 7.3-dBi at 8 GHz. ....

Artificial Magnetic Conductor Amc , Circular Polarization , Rinted Dipole ,

"Ultra Wideband Dual Circularly Polarized Patch Antenna for 5G and Cube" by Mohamed El Hammoumi, Najiba El Amrani El Idrissi et al.

In this paper, we propose a compact single-fed corner arc-truncated square patch antenna with T -diagonal slot and periodically defected ground (PDGS) plane for X band and mm-wave CubeSat applications. A square patch antenna printed on a grounded FR4 slab is used as the building block. Furthermore, its performance is enhanced in terms of impedance bandwidth by adding periodically circular slots in the ground plane to obtain ultra-wideband characteristics. Dual circular polarization, at two resonant frequencies of 10 and 25.6 GHz is achieved by loading the patch with a T-diagonal slot and truncating the corners in an arc shape. Its main features are dual resonance at 10 GHz and at 25.6 GHz, dual circular polarization, ultra-wide band characteristics as well as its compact size of 0.5λ0× 0.5λ0× 0.058λ0 at a resonant frequency of 10 GHz. ....

Circular Polarization , M Wave Range , Patch Antenna , Ultra Wideband , Bex Band ,

"High-Gain Circular Polarized Microstrip Patch Array for X-band CubeSat" by Panagiotis Ioannis Theoharis, Raad Raad et al.

In this paper a high gain circular polarized microstrip patch antenna array for X-band CubeSat applications is presented. The array consists of 36 elements arranged in a square lattice of 6x6 presenting circular polarization with a -3dB axial ratio bandwidth of 3.8% at 10. 4GHz. The antenna array is printed on FR4 substrate to reduce the overall cost of the CubeSat while achieving a -10dB impedance bandwidth of 21%. Finally, the array is mounted on the top face of a 1U CubeSat providing a high gain of 20.1dB at 10. 4GHz with a -3dB gain bandwidth of 38.4%. ....

X Band Cubesat , Antenna Array , Circular Polarization , High Data Rate , Bex Band ,

TCL 20L+ Hands-on Review: Affordable Smartphone with Premium Aspiration

Just how much premium features can TCL pack into the 20L+ smartphone? And is it good enough to replace the flagship phone that's in your hands? Let's dive in to find out. ....

Ibtimes Jeff Li , Circular Polarization , Exceptional Value ,