Dual-Band 2 × 2 MIMO Antenna with Compact Size and High Isolation Based on Half-Mode SIW by Abubaker Ahmed Elobied, Xue-Xia Yang, Ningjie Xie, Steven Gao

“…This paper presents a close-spaced dual-band 2 × 2 multiple-input multiple-output (MIMO) antenna with high isolation based on half-mode substrate integrated waveguide (HMSIW). The dual-band operation of the antenna element is achieved by loading a rectangular patch outside the radiating aperture of an HMSIW cavity. …”
Get full text

Wavelength Tuning Free Transceiver Module in OLT Downstream Multicasting 4λ × 10 Gb/s TWDM-PON System by M. S. Salleh, A. S. M. Supa’at, S. M. Idrus, S. Yaakob, Z. M. Yusof

“…Meanwhile, the fixed wavelength optical line terminal (OLT) transmitter with wavelength tuning free features has been designed to integrate with the semiconductor optical amplifier (SOA) and passive arrayed waveguide grating (AWG). By implementing hybrid multicasting and multiplexing, the system has been able to support a PON system with full flexibility function for managing highly efficient dynamic bandwidth allocation to support the 4λ×10 Gb/s TWDM-PON system used to connect 4 different PON links using fixed wavelength OLT transceivers with maximum 38 dB link loss.…”
Get full text

Time‐domain spectra of ultrasonic wave transmitted through granite and gypsum samples containing artificial defects by Zhuoran Tian, Chunjiang Zou, Yun Wu

Get full text

Study on Millimeter-Wave Vivaldi Rectenna and Arrays with High Conversion Efficiency by Guan-Nan Tan, Xue-Xia Yang, Huan Mei, Zhong-Liang Lu

“…A SIW- (substrate integrated waveguide-) to-microstrip transition is designed not only to integrate the antenna with the rectifying circuit directly but also to provide the DC bypass for the rectifying circuit. …”
Get full text

Optical Coupling Structures of Fiber-Optic Mach-Zehnder Interferometers Using CO2 Laser Irradiation by Chien-Hsing Chen, Chih-Yu Hsu, Pei-Hsing Huang, Jian-Neng Wang, Wei-Te Wu

“…Therefore, the MZI was integrated with a small fiber-optic waveguide component to develop an interferometer with fiber-optic characteristics, specifically a fiber-optic Mach-Zehnder interferometer (FO-MZI). …”
Get full text

Path Loss Modeling of Wireless Signals in Underground Tunnels by Yaning Li, Baoguo Yu, Lu Huang

“…In this paper, a hybrid model describing the propagation attenuation of wireless signals in underground tunnels is proposed, which divides the propagation channel into three subdomains according to the length of the tunnel, namely, the region of the free space propagation model, the region of the multimode propagation described by the ray tracing method, and the region of the improved waveguide model by adding the influences of tunnel roughness, tunnel inclination, and metal pipes. …”
Get full text

Parametric Study and Experimental Validation of Acoustic Leaky Wave Antenna in Spatial Localization by Alejandro Fernandez-Garrido, Maria Campo-Valera, Elena Abdo-Sanchez, Ruben Pico, Antonio-Javier Garcia-Sanchez, Rafael Asorey-Cacheda

“…Conventional arrays offer cost-effectiveness and simplicity of design, but ALWAs have the advantage of operating on the principle of energy leakage, which is achieved by various mechanisms, such as uniform apertures or slits periodic along the waveguide. This technology, applicable to underwater and airborne communications, offers compact and energy-efficient solutions, which facilitate the development of the “Underwater Internet of Things” and autonomous communication systems for underwater vehicles. …”
Get full text

Dual subwavelength-grating topology for building polarization beam splitters by Chia-Chih Huang

“…Here, we propose a compact and easy-to-fabricate PBS based on a dual subwavelength-grating (DSWG) structure positioned between two Si waveguides on a silicon-on-insulator platform. The coupling strengths of the transverse-electric (TE) and transverse-magnetic (TM) modes were selectively modified, with TE mode suppression and TM mode enhancement. …”
Get full text

FMCW-based contactless heart rate monitoring by Zhanjun Hao, Yifei Gao, Yangyang Tang, Yue Wang, Kai Fan, Fenfang Li

Get full text

Extraction of Least-Dispersive Ultrasonic Guided Wave Mode in Rail Track Based on Floquet-Bloch Theory by Maodan Yuan, Peter W. Tse, Weiming Xuan, Wenjin Xu

“…The proposed method provides an effective way to extract efficient UGW modes to assess the integrity of the rail track, as well as other waveguides with complex geometry.…”
Get full text

Multiepoch Observations of the Nearby Spiral Galaxy NGC 3938 with the Chandra X-Ray Observatory by Siddhi Raut, Eric M. Schlegel, Thomas G. Pannuti, Brannon W. Jones, Jacobo Matallana

“…We connect the detected sources to counterparts in other wavebands to the degree possible. Based on the two epochs, we identify three variable sources and an additional two that may have varied between the two observations. …”
Get full text

Additively-Manufactured, Magnetically Controlled, Frequency and Polarization Reconfigurable Phased Array Antenna by Ulan Myrzakhan, Farhan A. Ghaffar, Mohammad Vaseem, Atif Shamim

“…The array element of the proposed array antenna consists of a waveguide-based phase shifter, realized by printing metallic walls on a ferrite substrate, which is then monolithically integrated with a printed circular patch antenna. …”
Get full text

Fabrication of Axial and Radial Heterostructures for Semiconductor Nanowires by Using Selective-Area Metal-Organic Vapor-Phase Epitaxy by K. Hiruma, K. Tomioka, P. Mohan, L. Yang, J. Noborisaka, B. Hua, A. Hayashida, S. Fujisawa, S. Hara, J. Motohisa, T. Fukui

“…GaAs/AlGaAs, InP/InAs/InP, and GaAs/GaAsP core-shell structures have been found to be effective for the radial heterostructures to increase photoluminescence intensity and have enabled laser emissions from a single GaAs/GaAsP nanowire waveguide. The results have indicated that the core-shell structure is indispensable for surface passivation and practical use of nanowire optoelectronics devices.…”
Get full text

Research Progress on High-Intermediate Frequency Extension Methods of SEA by Jintao Su, Ling Zheng, Zhaoxiang Deng, Yuhan Jiang

“…Second, SEA intermediate frequency extension technology (experimental statistical energy analysis (ESEA), finite element statistical energy analysis (FE-SEA), statistical modal energy distribution analysis (SMEDA), and waveguide analysis (WGA)) are introduced. Neutron structure assembly and modeling, interval and mixed interval analysis, interval variable and mixed interval variable response are also described, so as to justify the development of a hybrid, large-scale interval algorithm. …”
Get full text

Enhanced thermal dissipation for BCB-bonded 3D integrated membrane photonic circuits by Salim Abdi, Kevin Williams, Yuqing Jiao

“…Indium–phosphide membrane on silicon is a nanophotonics platform which allows for monolithic integration of sub-micron nanophotonic waveguide circuits with native and efficient amplifiers and lasers. …”
Get full text

Synthesis and Characterisation of Copper(II) Complexes with Tridentate NNO Functionalized Ligand: Density Function Theory Study, DNA Binding Mechanism, Optical Properties, and Biol... by Madhumita Hazra, Tanushree Dolai, Akhil Pandey, Subrata Kumar Dey, Animesh Patra

“…The microscopy investigation suggested that microwires exhibited optical waveguide behaviour which are applicable as fluorescent nanomaterials and can be used as building blocks for miniaturized photonic devices. …”
Get full text

Highly Compact GCPW-Fed Multi-Branch Structure Multi-Band Antenna for Wireless Applications by Ikhlas Ahmad, Wasi Ur Rehman Khan, Sadiq Ullah, Naveed Mufti, Abdullah G. Alharbi, Niamat Hussain, Mohammad Alibakhshikenari, Mariana Dalarsson

“…In this work, we present a highly compact multi-branch structure multi-band antenna with a grounded coplanar waveguide (GCPW)-fed structure printed on 26 × 13 × 1.6 mm3 sized FR-4 substrate having dielectric constant εr of 4.3 and loss tangent δ of 0.02. …”
Get full text

Evaluating the Relationship Between Relative Permittivity and Infill Density in 3D Printed Dielectric Slabs by Bibek Kattel, Winn Elliott Hutchcraft, Richard K. Gordon

“…To explore this, dielectric slabs with varying sizes and infill densities were additively manufactured using Fused Deposition Modeling and measured for permittivity using reflection/transmission methods in air-filled waveguides. The measured relative permittivity at specific infill density is coined as effective relative permittivity throughout the paper. …”
Get full text

Diagnosis and Treatment of Irritable Bowel Syndrome: Clinical Recommendations of the Russian Gastroenterological Association and Association of Coloproctologists of Russia by V. T. Ivashkin, I. V. Maev, Yu. A. Shelygin, E. K. Baranskaya, S. S. Belous, E. A. Belousova, A. G. Beniashvili, S. V. Vasilyev, A. V. Veselov, E. G. Grigoryev, N. V. Kostenko, V. N. Kashnikov, V. F. Kulikovskiy, I. D. Loranskaya, O. S. Lyashenko, E. A. Poluektova, V. G. Rumyantsev, V. M. Timerbulatov, O. Yu. Fomenko, D. A. Khubezov, E. Yu. Chashkova, G. I. Chibisov, M. V. Shapina, A. A. Sheptulin, O. S. Shifrin, A. S. Trukhmanov, O. P. Alekseeva, S. A. Alekseenko, A. Yu. Baranovsky, O. Yu. Zolnikova, N. V. Korochanskaya, S. N. Mammayev, I. B. Khlynov, V. V. Tsukanov

“…The IBS sequence is typically wavelike, with alternating remissions and exacerbations often triggered by psychoemotional stress. …”
Get full text

Design and Analysis of Compact High–Performance Lithium–Niobate Electro–Optic Modulator Based on a Racetrack Resonator by Zixin Chen, Jianping Li, Weiqin Zheng, Hongkang Liu, Quandong Huang, Ya Han, Yuwen Qin

“…It also had a modulation bandwidth of 29 GHz and a tunability of 8.24 pm/V when the straight waveguide length was 100 μm. At the same time, the proposed device footprint was 1.92 × 10⁴ μm². …”
Get full text