scholarly journals A Multiband Proximity-Coupled-Fed Flexible Microstrip Antenna for Wireless Systems

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Giovanni Andrea Casula ◽  
Paolo Maxia ◽  
Giorgio Montisci ◽  
Giuseppe Valente ◽  
Giuseppe Mazzarella ◽  
...  
Keyword(s):  
Wireless Communications ◽  
Computer Aided Design ◽  
Microstrip Antenna ◽  
Flexible Substrate ◽  
Stop Band ◽  
General Purpose ◽  
Input Matching ◽  
Compact Size ◽  
Aided Design ◽  
Broadside Radiation

A multiband printed microstrip antenna for wireless communications is presented. The antenna is fed by a proximity-coupled microstrip line, and it is printed on a flexible substrate. The antenna has been designed using a general-purpose 3D computer-aided design software (CAD), CST Microwave Studio, and then realized. The comparison between simulated and measured results shows that the proposed antenna can be used for wireless communications for WLAN systems, covering both the WLAN S-band (2.45 GHz) and C-band (5.2 GHz), and the Wi-Max 3.5 GHz band, with satisfactory input matching and broadside radiation pattern. Moreover, it has a compact size, is very easy to realize, and presents a discrete out-of-band rejection, without requiring the use of stop-band filters. The proposed structure can be used also as a conformal antenna, and its frequency response and radiated field are satisfactory for curvatures up to 65°.

scholarly journals A Multiband Printed Log-Periodic Dipole Array for Wireless Communications

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Giovanni Andrea Casula ◽  
Paolo Maxia
Keyword(s):  
Wireless Communications ◽  
Radiation Pattern ◽  
Frequency Band ◽  
Stop Band ◽  
Operating Frequency ◽  
Frequency Bands ◽  
Operating Frequency Band ◽  
Input Matching ◽  
Compact Size ◽  
Cst Microwave Studio

A multiband printed Log-periodic dipole array (LPDA) antenna for wireless communications is presented. The antenna has been designed starting from Carrel’s theory, optimized using CST Microwave Studio 2012, and then realized. The comparison between simulated and measured results shows that the proposed antenna can be used for wireless communications both in the S (2.4–3 GHz) and in the C (5.2–5.8 GHz) frequency bands, with very good input matching and a satisfactory end-fire radiation pattern. Moreover, it has a compact size, is very easy to realize, and presents an excellent out-of-band rejection, without the use of stop-band filters, thus avoiding interference out of its operating frequency band.

scholarly journals Pushing the Design Envelope with CAE

1998 ◽  
Vol 120 (11) ◽  
pp. 66-71 ◽  
Author(s):  
Mar Halpern
Keyword(s):  
Computer Aided Design ◽  
Electronics Packaging ◽  
General Purpose ◽  
Element Analysis ◽  
Packaging Design ◽  
Computer Aided ◽  
Aided Design ◽  
Cae Simulation ◽  
Disc Drive

This article examines the growing usefulness of computer-aided engineering (CAE) programs for the design of electronics packaging. CAE combined with expert interpretation, can help manufacturers quickly satisfy demand for increasingly small yet reliable products. Currently, three classes of software specifically support electronics packaging design: integrated computer-aided design (CAD) CAE software, general-purpose CAE software, and specialty CAE software solutions. The integrated CAE software emphasizes automatic creation and updating of finite-element-analysis (FEA) models based on CAD geometry. The effectiveness of this associativity between CAD and FEA depends on the product behavior to be evaluated and the quality of implementation. CAE simulation can calculate the maximum acceptable loads on pins, as well as the vibration characteristics of components. Solids-based CAD helps detect interference problems across components, as in these exploded views of a disc drive and a headset. While several general-purpose CAE suppliers permit engineers to build customized environments for automating model creation, specialty suppliers such as Pacific Numerix deliver the specific automated capabilities and connector libraries.

Machine parts. Course design

2021 ◽  
Author(s):  
Vladimir Ovtov
Keyword(s):  
Computer Aided Design ◽  
Course Design ◽  
General Purpose ◽  
Bachelor's Degree ◽  
Design System ◽  
Federal State ◽  
Chain Transmission ◽  
State Educational ◽  
Aided Design ◽  
Independent Work

The textbook discusses the methodology of course design of general-purpose drives with a single-stage gearbox (cylindrical, conical and worm) and a V-belt or chain transmission. The procedure for calculating gears and constructing assembly drawings of gearboxes is shown, the development of specifications using the COMPASS-3D computer-aided design system is described. Examples of the design of drawings of the general type of the drive, assembly drawings of gearboxes and working drawings of parts of various types of gearboxes are given. Meets the requirements of the federal state educational standards of higher education of the latest generation. It is intended for independent work of students of engineering specialties studying in the bachelor's degree and specialty.

scholarly journals ANN Synthesis Model of Single-Feed Corner-Truncated Circularly Polarized Microstrip Antenna with an Air Gap for Wideband Applications

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Zhongbao Wang ◽  
Shaojun Fang
Keyword(s):  
Computer Aided Design ◽  
Microstrip Antenna ◽  
Microstrip Antennas ◽  
Air Gap ◽  
Training Data ◽  
Data Sets ◽  
Circularly Polarized ◽  
Artificial Neural Network Ann ◽  
Aided Design ◽  
Lm Algorithm

A computer-aided design model based on the artificial neural network (ANN) is proposed to directly obtain patch physical dimensions of the single-feed corner-truncated circularly polarized microstrip antenna (CPMA) with an air gap for wideband applications. To take account of the effect of the air gap, an equivalent relative permittivity is introduced and adopted to calculate the resonant frequency andQ-factor of square microstrip antennas for obtaining the training data sets. ANN architectures using multilayered perceptrons (MLPs) and radial basis function networks (RBFNs) are compared. Also, six learning algorithms are used to train the MLPs for comparison. It is found that MLPs trained with the Levenberg-Marquardt (LM) algorithm are better than RBFNs for the synthesis of the CPMA. An accurate model is achieved by using an MLP with three hidden layers. The model is validated by the electromagnetic simulation and measurements. It is enormously useful to antenna engineers for facilitating the design of the single-feed CPMA with an air gap.

Computer Aided Design Of Garments Using Digitized Three-Dimensional Surfaces

1992 ◽  
Vol 206 (3) ◽  
pp. 199-206 ◽  
Author(s):  
J McCartney ◽  
B K Hinds
Keyword(s):  
Computer Aided Design ◽  
Standard Form ◽  
Three Dimensional ◽  
Data Entry ◽  
General Purpose ◽  
Computer Aided ◽  
Offset Surfaces ◽  
Design Systems ◽  
Aided Design

In the apparel field, there is the problem of creating a design with respect to an underlying standard form. Instead of applying general-purpose three-dimensional computer aided design systems to such tasks it is proposed that design can be carried more efficiently with bespoke design systems. These can be targeted to deal with the problems of accurately defining the offset surfaces which comprise the garment. Such a system is introduced and the methods of data entry are discussed. Position on the three-dimensional form is determined using a digitizer tablet and fit with respect to the form is specified by an offset dimension. It is shown that complex garment pieces with variable fit can be quickly specified within the system.

scholarly journals Resonant Frequency of Circular Sectorial Microstrip Antenna Printed On Double-Layered Anisotropic Substrates

2021 ◽  
Author(s):  
Souad FRIHA ◽  
Sami Bedra ◽  
Fouad CHEBBARA ◽  
Randa BEDRA ◽  
Siham BENKOUDA
Keyword(s):  
Resonant Frequency ◽  
Computer Aided Design ◽  
Microstrip Antenna ◽  
Microstrip Antennas ◽  
Resonant Frequencies ◽  
Design Engineers ◽  
Anisotropic Substrates ◽  
Aided Design ◽  
Composite Substrates ◽  
Good Agreement

Abstract In this work, modal characteristics have been rigorously studied which germinate an improved, accurate, and efficient computer-aided design (CAD) formulation to estimate the resonant frequency of sectorial circular microstrip antennas printed on anisotropic suspended and composite substrates. The obtained results demonstrated that the resonant frequencies of the sectorial circular microstrip patch on suspended and composite substrates can be adjusted to obtain the maximum operating frequency of the antenna. The computed results show a fairly good agreement with measured results. Such theoretical validation and results may prove to be more useful for design engineers and further investigation.

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