Cylindrical and quasi-cylindrical focalization of air-coupled single element and linear array transducers

2017 ◽  
Author(s):  
Tomas Gomez Alvarez-Arenas ◽  
Jorge Camacho ◽  
Luis Diez
Keyword(s):  
Linear Array ◽  
Single Element

scholarly journals High gain 5G MIMO antenna for mobile base station

2019 ◽  
Vol 9 (1) ◽  
pp. 468 ◽  
Author(s):  
Yusnita Rahayu ◽  
Indah Permata Sari ◽  
Dara Incam Ramadhan ◽  
Razali Ngah
Keyword(s):  
Linear Array ◽  
Multiple Input Multiple Output ◽  
High Gain ◽  
Base Station ◽  
Impedance Bandwidth ◽  
Single Element ◽  
Mimo Antenna ◽  
Input Multiple Output ◽  
Mobile Base Station ◽  
Mobile Base

This article presented a millimeter wave antenna which operated at 38 GHz for 5G mobile base station. The MIMO (Multiple Input Multiple Output) antenna consisted of 1x10 linear array configurations. The proposed antenna’s size was 88 x 98 mm^2  and printed on 1.575 mm-thick Rogers Duroid 5880 subsrate with dielectric constant of ε_r= 2.2 and loss tangent (tanδ) of 0.0009. The antenna array covered along the azimuth plane to provide the coverage to the users in omnidirection. The simulated results showed that the single element antenna had the reflection coefficient (S11) of -59 dB, less than -10 dB in the frequency range of 35.5 - 39.6 GHz. More than 4.1 GHz of impedance bandwidth was obtained. The gain of the antenna linear array was 17.8 dBi while the suppression of the side lobes was -2.7 dB.  It showed a high array gain throughout the impedance bandwidth with overall of VSWR were below 1.0646. It designed using CST microwave studio.

Pyroelectric single-element and linear-array sensors based on P(VDF/TrFE) thin films

1994 ◽  
Vol 45 (3) ◽  
pp. 209-218 ◽  
Author(s):  
Reinhard Köhler ◽  
Norbert Neumann ◽  
Günter Hofmann
Keyword(s):  
Thin Films ◽  
Linear Array ◽  
Single Element

Solar Spectrum Splitting Parallel Junction High Efficiency Concentrating Photovoltaics

2012 ◽  
Vol 1391 ◽  
Author(s):  
Lirong Z. Broderick ◽  
Marco Stefancich ◽  
Dario Roncati ◽  
Brian R. Albert ◽  
Xing Sheng ◽  
...  
Keyword(s):  
Solar Cells ◽  
High Efficiency ◽  
Linear Array ◽  
Low Cost ◽  
Spectral Band ◽  
Solar Spectrum ◽  
Optical Loss ◽  
Single Element ◽  
Si Substrate ◽  
Spectrum Splitting

ABSTRACTA compact, single element concentrator comprising a near linear array of prisms has been designed to simultaneously split and concentrate the solar spectrum. Laterally aligned solar cells with different bandgaps are devised to be fabricated on a common Si substrate, with each cell absorbing a different spectral band optimized for highest overall power conversion efficiency. Epitaxial Ge on Si is used as a low cost virtual substrate for III-V materials growth. Assuming no optical loss for the prism concentrator, no shadowing and perfect carrier collection for the solar cells, simulations show that 39% efficiency can be achieved for a parallel four-junction (4PJ) InGaP-GaAs-Si-Ge cell under 200X concentration, and higher efficiency is possible with more junctions.

Circular Complementary Split Ring Resonator Rotation for Linear Array Millimeter Wave Microstrip Patch Antenna

2021 ◽  
Vol 20 (3) ◽  
pp. 43-47
Author(s):  
Norsaidah Muhamad Nadzir ◽  
Mohamad Kamal A. Rahim ◽  
Noor Asniza Murad ◽  
Mohamed Himdi ◽  
Osman Ayop
Keyword(s):  
Millimeter Wave ◽  
Linear Array ◽  
Ground Plane ◽  
Split Ring Resonator ◽  
Dual Band ◽  
Single Element ◽  
Horizontal Polarization ◽  
Angular Rotation ◽  
Complementary Split Ring Resonator ◽  
Multiple Frequencies

This paper proposes multiple linear array millimeter wave MPAs that could operate at various frequencies depending on the angular rotation of the CSRR structure. The main contribution of this work is the range of frequencies of the linear array MPA found when the position of the CSRR structure is changed angularly. This is achieved by positioning the CSRR structure on the ground plane of the MPA and rotate it to an incremental of 22.5°. Computer Simulation Technology software is used to simulate the antenna designs. The performance of the antenna is evaluated against the single element millimeter wave MPA with similar angular rotation to the CSRR structure. The reflection coefficient graph shows at 0° rotation, the antenna has dual band performance at 26 GHz and 28 GHz. At 22.5° and 45° CSRR structure rotation, the antenna shows triple band performance with different operational frequencies and different polarization depending on the frequencies. Finally, at 67.5° CSRR structure rotation, the antenna now is operational only at 20 GHz frequency with horizontal polarization performance. Plus, the results between the single element MPA with circular CSSRR and the linear array MPA with circular CSRR shows similar behavior in which the rotation of the CSRR did not affect the antenna differently even with an increase of the number of elements. The millimeter wave MPA with CSRR angular rotation can be utilized in various applications as it covers multiple frequencies depending on the angle of rotation of the CSRR structure.

Preparation and Pyroelectric Properties of La-Modified PbTiO8 Thin Films by Rf-Magnetron Sputtering

1996 ◽  
Vol 433 ◽  
Author(s):  
T. Kamada ◽  
R. Takayama ◽  
A. Tomozawa ◽  
S. Fujii ◽  
K. IIJIMA ◽  
...  
Keyword(s):  
Thin Films ◽  
Magnetron Sputtering ◽  
Linear Array ◽  
Rf Magnetron Sputtering ◽  
Fast Response ◽  
Pyroelectric Coefficient ◽  
Single Element ◽  
Air Conditioner ◽  
Pyroelectric Properties ◽  
Ir Sensors

AbstractHigh-quality La-modified PbTiO3 (Pb1−xLaxTi1−x/4O3; PLT) thin films were prepared by an rf-magnetron sputtering method. In this method, intermittent deposition was realized by periodical repetition of deposition and nondeposition processes. This deposition was found to enhance the horizontal grain growth of the films. The PLT thin films exhibit the phenomena named “self-polarization” and have high pyroelectric properties (pyroelectric coefficient γ of 5.0×10−8C/cm2K and low dielectric constant εr of 185) without a poling treatment. It was interestingly found that this self-polarization of the PLT thin films depends on the substrate temperature (Ts) and is based on a fairly small difference of the film composition (Pb/Ti). The pyroelectric properties were improved by means of addition of Mg to the PLT thin films. These thin films are expected to offer suitable materials for pyroelectric infrared (IR) sensors. High sensitive pyroelectric IR sensors (single element type and linear array type) were fabricated by using the PLT (x=0. 1) thin films with the new structures and the device processes. The sensors have remarkably high specific detectivity D* of 3.5×108 cm. Hz1/2/W and very fast response. A new compact IR sensing system using the linear array sensor (8 elements) has been developed for a new type of room air-conditioner.

scholarly journals A Novel Chebyshev Series Fed Linear Array with High Gain and Low Sidelobe Level for WLAN Outdoor Systems

2018 ◽  
Vol 8 (1-2) ◽  
Author(s):  
The Toan Tang ◽  
Minh Tran Nguyen ◽  
Vu Bang Giang Truong
Keyword(s):  
Linear Array ◽  
Measurement Data ◽  
High Gain ◽  
Single Element ◽  
Sidelobe Level ◽  
Antenna Theory ◽  
Yagi Antenna ◽  
Low Sidelobe ◽  
Structure Simulation ◽  
Microstrip Array Antenna

This paper proposes a novel high gain and low sidelobe level (SLL) linear microstrip array antenna for outdoor WLAN applications. The antenna consists of two main parts, which are a linear array and a reflector. The linear array comprises of 10 elements; those have been designed on Rogers RT/Duroid 5870tm with the dimensions of 422×100×10.15 mm3. To gain low SLLs, a series fed network was designed to have the output signals being proportional to the Chebyshev distributions (with preset SLL of -30 dB). Furthermore, Yagi antenna theory has been applied by adding directors above every single element to increase the directivity of the single element. The reflector has been constructed at the back of the proposed structure. Simulation results show that the array can provide high gain of 17.5 dBi and a low SLL of -26 dB. A prototype has been fabricated and measured. Good agreements between simulation and measurement data have been obtained.

scholarly journals 10 MHz Ultrasound Linear Array Design for Medical Application

2019 ◽  
Vol 17 (12.2) ◽  
pp. 1
Author(s):  
Khuong Thi Thao Pham
Keyword(s):  
Piezoelectric Material ◽  
Active Layer ◽  
Linear Array ◽  
Medical Application ◽  
Ultrasound Transducer ◽  
Beam Forming ◽  
Single Element ◽  
3D Fem ◽  
Array Design ◽  
1D Model

This report represents a design and simulation of 10 MHz ultrasound transducer for medical application. The array is designed with 64 elements of 50µm width, 25µm kerf and 1mm elevation for each element. This results in the total transducer dimension of 1mm x 4.8mm. Piezoelectric material PZT 5H is chosen as the active layer while commercial materials named Ecosorb-MF116 and Polystyrene Fostarene-50 are chosen as two matching layers. Transducer’s 1D model using XTrans design toolbox and 3D FEM Comsol models (charge and voltage control) are investigated both accounted the effect of the 500nm electrode layers. Single element and array beam forming are calculated using Field II. A simulation of phantom imaging is observed using the transducer.

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