Description: Electrical Engineering/Antennas and Propagation Microstrip Antennas The Analysis and Design of Microstrip Antennas and Arrays Microstrip Antennas contains valuable new information on antenna design and an excellent introduction to the work done in the microstrip antenna area over the past 20 years. The articles are well–chosen and (are) complete with practical design information that is very useful for the working engineer. Stuart Long, University of Houston The editors have done an outstanding job in assembling this updated reprint book. It is a welcome addition to the list of books on microstrip antennas. There is no doubt that it will be a valuable source of information for graduate students, engineers and researchers the original articles are written lucidly and are very informative, and the reprint articles are well chosen. Kai Fong Lee, The University of Toledo Complete with an up–to–date tutorial overview of the field and substantial new, introductory material for each topic, Microstrip Antennas combines in one source a selection of today’s most significant and useful articles on microstrip and antenna design. Eminent experts David M. Pozar and Daniel H. Schaubert guide you through:

Microstrip Antennas The Analysis And Design Of Microstrip Antennas And Arrays

Foundations Of Image Science

Modern Antenna Design

Modern telecommunication systems require miniature antennas with multiband characteristics that support multiple wireless applications. This paper presents a convex pentagon shaped microstrip antenna that works at 1.8GHz with a return loss of −19 dB. The antenna is powered using proximity coupled feed method implemented in a multilayer substrate. The pentagon shaped microstrip antenna is converted in to a dual band antenna by applying fractal shape into the antenna geometry. Here durer pentagon fractal concept is used to develop dual band antenna which produces multiple resonance at 1.8 GHZ and 2.45 GHz. The antenna finds suitable for cellular communication and Bluetooth / RFID applications. Size reduction up to 25.56 % in terms of patch size is achieved in the proposed fractal antenna in comparison to pentagon patch antenna operating in the first resonant frequency band.

Microstrip antenna based on durer pentagon fractal patch for multiband wireless applications

This paper presents the design of compact slotted rectangular microstrip patch antenna for operates 5 GHz. The proposed antenna is designed on RT duroid substrate with dielectric constant of 2.2 and fed with 50 ohms microstrip line. Further DGS (Defected Ground Structure) technique is used to increase the gain of the antenna. Bandwidth is enhancing by introducing the slot in the rectangular patch antenna. The characteristics of the proposed antenna have been studied with the help of HFSS (High Frequency Structure Simulator) software. HFSS is a high performance full wave electromagnetic (EM) field simulator. Ansoft HFSS employs the Finite Element Method (FEM). The design targets the frequency band (5.180 – 5.825 GHz) being used in various wireless communication systems, such as satellite communication, radio altimeters etc. The final antenna produced 720MHz bandwidth,1.11 VSWR and 7.27dB gain at frequency 5.39 GHz. General Terms In this paper slotting has to be done to enhance the bandwidth.

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Design and Simulation of Slotted Rectangular Microstrip Patch Antenna

This paper addresses the problems encountered during digitization and preservation of inscriptions such as perspective distortion and minimal distinction between foreground and background. In general inscriptions possess neither standard size and shape nor colour difference between the foreground and background. Hence the existing methods like variance based extraction and Fast ICA based analysis fail to extract text from these inscription images. Natural gradient flexible ICA (NGFICA) is a suitable method for separating signals from a mixture of highly correlated signals, as it minimizes the dependency among the signals by considering the
slope of the signal at each point. We propose an NGFICA based enhancement of inscription images. The proposed method improves word and character recognition accuracies of the OCR system by 65.3% (from 10.1% to 75.4%) and 54.3% (from 32.4% to 86.7%), respectively.

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NGFICA Based Digitization of Historic Inscription Images

The design of single feed dual band PIFA operating at 2.25and 3.546 GHz is presented. Two dimensional method of moments (MOM) electromagnetic simulator, IE3D version: 12, is used in the design simulation of this dual band antenna. The results exhibit a proper operation of the antenna in terms of return loss, bandwidth, efficiency, gain at both bands. ISM, Bluetooth, Wi-max, IEEE 802.11b, 802.11g, 802.11n, 802.16e, WiFi, Wi-max are the most important applications within the above mentioned frequency bands. Simulation tool, based on the method of moments (ZELAND IE3D version 12.0) has been used to analyze and optimize the antenna. The measured and simulated results are presented and all are acceptable to the standard antennas.

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Design of planar inverted - F antenna for wireless applications

This paper addresses the problems encountered during digitization and preservation of inscriptions such as perspective distortion and minimal distinction between foreground and background. In general inscriptions neither possess standard size and shape nor colour difference between the foreground and background. Hence the existing methods like variance based extraction and Fast-ICA based analysis fail to extract text from these inscription images. Natural gradient Flexible ICA (NGFICA) is a suitable method for separating signals from a mixture of highly correlated signals, as it minimizes the dependency among the signals by considering the slope of the signal at each point. We propose an NGFICA based enhancement of inscription images. The proposed method improves word and character recognition accuracies of the OCR system by 65.3% (from 10.1% to 75.4%) and 54.3% (from 32.4% to 86.7%) respectively.

Enhancement of inscription images

In this paper, a dual-frequency stacked patch with asymmetric U-slot on lower patch and a rectangular slot on upper patch is presented. For wireless system and RF applications, the microstrip patch is one of the most chosen antenna structures because of its being cheaper and compact design. Dual-Band antennas are of a main interest as they can support several communication systems. The designed antenna is experimentally verified for the required performance with the help of IE3D software. Dual frequency operation is obtained by loading slots in rectangular patches and good impedance bandwidth is obtained by using Rogers Duroid 5880 with slight difference in dielectric permittivity for upper and lower patch. The impedance bandwidth (VSWR ≤ 2) is obtained as 4.29% for 3.4 GHz and 6.32% for 5.6GHz. Return losses obtained are -31 dB and -42dB at 3.4GHz and 5.6 GHz respectively.

Design of stacked miniaturized slotted antenna with enhanced bandwidth for WiMAX application

In this paper a novel method to address the problem of enhancement and binarization of historic inscription images is presented. Inscription images in general have no distinction between the text layer and background layer due to absence of color difference and possess highly correlated signals and noise. The proposed technique provides a suitable method to separate the text layer from the historic inscription images by considering the problem as blind source separation which aims to calculate the independent components from a linear mixture of source signals, by maximizing a contrast function based on higher order cumulants. Further, the results are compared with existing ICA based techniques like NGFICA and Fast-ICA.

N. Jayanthi

Papers

NGFICA Based Digitization of Historic Inscription Images

Design of planar inverted - F antenna for wireless applications

Enhancement of inscription images

Design of stacked miniaturized slotted antenna with enhanced bandwidth for WiMAX application

Digitization of Historic Inscription Images using Cumulants based Simultaneous Blind Source Extraction