Home » International Journal

International Journal

Find a document written by the best international scientists in our secure database.

940 documents found for International Journal
Directivity improvement and optimal far field pattern of time modulated concentric circular antenna array using hybrid evolutionary algorithms
Gopi Ram, Durbadal Mandal, Rajib Kar, Sakti Prasad Ghoshal
Published online : 01-02-2017
Article Access
View abstract
In this paper time modulated nine-ring concentric circular antenna array (TMCCAA) using fitness based novel hybrid adaptive differential evolution with particle swarm optimization (ADEPSO) has been studied. ADEPSO is hybrid of fitness based adaptive differential evolution and particle swarm optimization (PSO). Differential evolution is a simple and robust evolutionary algorithm but sometimes cause
Broad band circularly polarized square slot array antenna with improved sequentially rotated feed network for C-band application
Puria Bairami, Mahdi Zavvari
Published online : 01-02-2017
Article Access
View abstract
In this paper, an array antenna with asymmetric antenna fed network is presented. Total size of the proposed array antenna (with 2 × 2 elements) is 90 × 90 mm and distance between elements (fed by fed) is ?/2 (? = wavelength in free space). The proposed antenna is fed by coaxial cable that isolated input impedance from impedance of the array antenna feed network. The measured impedance bandwidth o
Compact dual-band truncated patch antenna with fractal defected ground structure for wireless applications
B. Rama Sanjeeva Reddy, D. Vakula
Published online : 01-02-2017
Article Access
View abstract
In this paper, a compact, dual-band patch antenna is proposed over Minkowski fractal defected ground structure (DGS) for bandwidth enhancement of global positioning system (GPS) applications. The proposed design combines the truncated dual L-shaped slits cut on diagonal corners of radiating patch and fractal defect on the metallic ground plane. This concept shifts the frequencies to lower bands wi
A CPW-fed stepped slot UWB antenna for MIMO/diversity applications
Raj Kumar, Neha Pazare
Published online : 01-02-2017
Article Access
View abstract
An ultra-wideband (UWB) slot antenna for diversity applications is introduced. The overall structure of the antenna consists of two similar coplanar waveguide (CPW)-fed stepped rectangular slots placed in an orthogonal position. The slots are asymmetric with respect to their placement in the ground plane. The CPW feeds are double stepped and terminated on hexagonal patches for better impedance mat
Super wideband antenna with single band suppression
Murli Manohar, Rakhesh Singh Kshetrimayum, Anup Kumar Gogoi
Published online : 01-02-2017
Article Access
View abstract
In this paper, a band-notched compact printed monopole super wideband (SWB) antenna has been designed and fabricated. The SWB antenna composed of a radiating patch with a 50 ? triangular tapered feed line which is connected through a feed region, and a chamfered ground plane (CGP), that covers the frequency band from 0.9?100 GHz (ratio bandwidth of 111.1:1) with a reflection coefficient |S| < ?10
Super wideband printed monopole antenna for ultra wideband applications
Sandeep Kumar Palaniswamy, Malathi Kanagasabai, Shrivastav Arun Kumar, M. Gulam Nabi Alsath, Sangeetha Velan, Jayaram Kizhekke Pakkathillam
Published online : 01-02-2017
Article Access
View abstract
This paper presents the design, testing, and analysis of a clover structured monopole antenna for super wideband applications. The proposed antenna has a wide impedance bandwidth (?10 dB bandwidth) from 1.9 GHz to frequency over 30 GHz. The clover shaped antenna with a compact size of 50 mm × 45 mm is designed and fabricated on an FR4 substrate with a thickness of 1.6 mm. Parametric study has been
Reconfigurable antennas with frequency, polarization, and pattern diversities for multi-radio wireless applications
Chilukuri Sulakshana, Lokam Anjaneyulu
Published online : 01-02-2017
Article Access
View abstract
This paper presents different reconfigurable antennas with frequency, polarization, and pattern diversities. All the antennas have a very simple, novel, and compact structures, which are used for different wireless communication applications. These antennas employ switching for obtaining different reconfigurations. At first, an E-shaped antenna is designed for multi-band frequency reconfigurabilit
Four element triangular dielectric resonator antenna for wireless application
Ravi Kumar Gangwar, Pinku Ranjan, Abhishek Aigal
Published online : 01-02-2017
Article Access
View abstract
A wideband four element triangular dielectric resonator antenna (TDRA) has been designed and fabricated by using 50 ? coaxial probe feed. The input and radiation characteristics of the proposed antenna have been extracted through Ansoft HFSS and CST Microwave Studio simulation software and compared with the experimental results. The simulated results have been in good agreement with the experiment
Conformal antenna array for millimeter-wave communications: performance evaluation
V. Semkin, A. Bisognin, M. Kyrö, V-M. Kolmonen, C. Luxey, F. Ferrero, F. Devillers, A.V. Räisänen
Published online : 01-02-2017
Article Access
View abstract
In this paper, we study the influence of the radius of a cylindrical supporting structure on radiation properties of a conformal millimeter-wave antenna array. Bent antenna array structures on cylindrical surfaces may have important applications in future mobile devices. Small radii may be needed if the antenna is printed on the edges of mobile devices and in items which human beings are wearing,
Minimum redundancy MIMO array synthesis with a hybrid method based on cyclic difference sets and ACO
Jian Dong, Ronghua Shi, Ying Guo
Published online : 01-02-2017
Article Access
View abstract
As a recently proposed concept, multiple-input multiple-output (MIMO) radars exhibit much higher spatial resolution than traditional transmitter based radars because of the synthesized virtual array. In this paper, the problem of minimum redundancy (MR)-MIMO array synthesis is addressed, which seeks to maximize the virtual array aperture of MIMO radars for a given number of transmitting and receiv
Design development and experimental validation of an EBG matrix antenna for tracking application
Hussein Abou Taam, Georges Zakka El Nashef, Eric Arnaud, Nicolas Chevalier, Bertrand Lenoir, Bernard Jecko, Mohamed Rammal
Published online : 01-02-2017
Article Access
View abstract
Today's increase of functions, improvement of performances, and cost reductions required on an agile electronically scanned antenna, drive researchers to develop an innovative antennas? concept in order to deal with the proposed challenge. In this context, this article describes and demonstrates an experimental prototype to show the reliability and efficiency of the electromagnetic band gap EBG ma
Cognitive null steering in frequency diverse array radars
Sarah Saeed, Ijaz Mansoor Qureshi, Abdul Basit, Ayesha Salman, Waseem Khan
Published online : 01-02-2017
Article Access
View abstract
Null steering has been a challenge in radar communications for the past few decades. In this paper, a novel cognitive null steering technique in frequency diverse array radars using frequency offset selection is presented. The proposed system is a complete implementable framework that provides precise and deep null placement in the range and angle locations of the interference source. The proposed
Design of CPW-fed tapered MIMO antenna for ISM band applications
Srimathi Mathialagan
Published online : 01-02-2017
Article Access
View abstract
In this paper, an implantable coplanar waveguide-fed tapered monopole antenna for industrial scientific and medical band (2.4?2.48 GHz) applications is proposed. This proposed design has an overall dimension of 44 × 44 × 0.5 mm. The designed antenna is made compatible for implantation on human tissues such as skin, fat, or muscles by embedding it on the RT Duroid substrate and the 10 dB return los
Rotman lens combined with wide bandwidth antenna array for 60 GHz RFID applications
Ali Attaran, Rashid Rashidzadeh, Roberto Muscedere
Published online : 01-02-2017
Article Access
View abstract
This paper presents a novel technique to design a Rotman lens feeding a wide bandwidth microstrip patch antenna array for 60 GHz radio frequency identification (RFID) applications. The proposed scheme supports both location positioning and increases the communication range through beam forming. The antenna array is designed using ?/4 microstrip transmission lines to support high gain, directivity,
Design of compact dual-frequency antenna with bandwidth enhancement
Liping Han, Longfei Hao, Liyun Yan, Runbo Ma, Wenmei Zhang
Published online : 01-02-2017
Article Access
View abstract
A compact dual-frequency antenna with enhanced bandwidth is proposed in this paper. Dual-frequency operation is realized by cutting a slot in the elliptical patch, and bandwidth enhancement is achieved by using a partial ground plane. Compared with the conventional half-wave antenna, the antenna has a compact size of 24 × 20 mm, which equals to 0.38 ? × 0.31 ? (?, the guided wavelength at the firs
Compact asymmetric coplanar strip fed Sinc shaped monopole antenna for multiband applications
Ritesh Kumar Badhai, Nisha Gupta
Published online : 01-02-2017
Article Access
View abstract
A compact asymmetric coplanar strip fed Sinc shaped monopole antenna suitable for multifrequency operations is proposed for portable wireless devices. The proposed Sinc shaped monopole antenna with truncated half ground plane operates at three frequency bands, 2110?2380, 4180?4600, and 5200?5678 MHz, showing fractional impedance bandwidths of 12, 9, and 8.8%, respectively, suitable for Universal M
Compact dual-band bandpass filter using asymmetric stepped impedance stub loaded multimode resonator
Manimala Pal, Rowdra Ghatak, Pankaj Sarkar
Published online : 01-02-2017
Article Access
View abstract
This paper presents, a dual-band bandpass filter using asymmetric stepped impedance stub loaded open loop resonator (OLR) for WLAN and WiMAX application. The outer OLR is realized to operate at lower passband of 2.45 GHz which is directly coupled to input and output ports whereas the asymmetric stepped impedance stub that loads the outer resonator contributes to 3.5 GHz passband. The introduction
Total efficiency enhancement of X-band compact choke horn antenna with circular polarization and isoflux pattern
Eric Arnaud, Luc Duchesne, Kevin Elis, Jamil Fouany, Thierry Monediere, Marc Thevenot
Published online : 01-02-2017
Article Access
View abstract
This paper presents a solution to reduce the feed complexity and to improve the total efficiency of X-band compact choke horn antenna with circular polarization and isoflux pattern. This kind of antenna had been designed before by our laboratory for nanosatellite applications, but it required a 4-way divider with phase shifter which generates the insertion losses and therefore a lower realized gai
Inverted L-slot triple-band antenna with defected ground structure for WLAN and WiMAX applications
Alaknanda Kunwar, Anil Kumar Gautam, Binod Kumar Kanaujia
Published online : 01-02-2017
Article Access
View abstract
To incorporate two different communication standards in a single device, a compact triple-band antenna is proposed in this paper. The proposed antenna is formed by etching an inverted L-shaped slot on the patch with defected ground structure. The antenna is targeted to excite three separate bands first from 2.39?2.51, second from 3.15?3.91, and third from 4.91?6.08 GHz that covers entire Wireless
A multilayer dual wideband circularly polarized microstrip antenna with DGS for WLAN/Bluetooth/ZigBee/Wi-Max/ IMT band applications
Amanpreet Kaur, Rajesh Khanna, Machavaram Kartikeyan
Published online : 01-03-2017
Article Access
View abstract
In this paper, a three layered stacked circularly polarized rectangular dual band microstrip antenna with a defected ground structure (DGS) and a feed network with stub (showing dual wideband characteristic) is designed, fabricated, and tested for WLAN, Zig bee, Wi-Max, and IMT band applications. The proposed antenna is fabricated on an FR4 substrate with dielectric constant (?) of 4.4; tan? of 0.
MRF volume 9 issue 1 Cover and Back matter
Published online : 01-02-2017
Article Access
View abstract
MRF volume 9 issue 1 Cover and Front matter
Published online : 01-02-2017
Article Access
View abstract
Threshold voltage-level change in ASK demodulator related to RF input signal amplitude for the ultra-high frequency RFID passive tag
Rezvan Dastanian, Ebrahim Abiri, Khadije Taherinia
Published online : 01-02-2017
Article Access
View abstract
In this paper, an amplitude shift keying (ASK) demodulator with 100% modulation depth is proposed. In order to achieve the higher power and wider reading range the designed ASK demodulator works in the ultra-high frequency. In this design, the average detector and voltage divider are used in order to define the appropriate threshold voltage level for the radio frequency input signal which leads to
An 850 nm SiGe/Si HPT with a 4.12 GHz maximum optical transition frequency and 0.805A/W responsivity
Zerihun Gedeb Tegegne, Carlos Viana, Marc D. Rosales, Julien Schiellein, Jean-Luc Polleux, Marjorie Grzeskowiak, Elodie Richalot, Catherine Algani
Published online : 01-02-2017
Article Access
View abstract
A 10 × 10 ?m SiGe heterojunction bipolar photo-transistor (HPT) is fabricated using a commercial technological process of 80 GHz SiGe bipolar transistors (HBT). Its technology and structure are first briefly described. Its optimal opto-microwave dynamic performance is then analyzed versus voltage biasing conditions for opto-microwave continuous wave measurements. The optimal biasing points are the
Switchable bandpass filter using CRLH cells based on a new kind of admittance inverter
Samaneh Keshavarzi, Zahra Atlasbaf
Published online : 01-02-2017
Article Access
View abstract
In this paper, a new kind of admittance inverter and design of a switchable microstrip bandpass filter using composite right/left-handed (CRLH) cells has been presented. The proposed filter has two states (or passbands). One of the two passbands, is accessible at each time by on/off state of three PIN diodes. This filter is a three-pole, coupled resonator filter, composed of short-circuited shunt
0 document found for International Journal

ArtWhere Création de site Internet