Home » International Journal

International Journal

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

967 documents found for International Journal
Analysis and design of compact wide bandpass filter with ultra-wide stopband using multi-stub loaded resonator
Di Lu, Xiao-Hong Tang
Published online : 01-04-2017
Article Access
View abstract
A compact microstrip multi-stub loaded bandpass filter (BPF) with ultra-wide stopband is introduced and investigated. Lumped-equivalent circuit (LEC) method is adopted to analyze the characteristics of the in-band response based upon the low frequency LEC and even-odd mode analytical method. Besides, equivalent transmission line circuit method with even-odd mode analytical method are adopted to di
Studying the nonlinear performance of an amplifying reflectarray antenna
Iman Aryanian, Abdolali Abdipour, Gholamreza Moradi
Published online : 01-04-2017
Article Access
View abstract
In this paper, significance of studying the nonlinear performance of amplifying reflectarray antenna is clarified by showing nonlinear behavior of the unit cell. Furthermore, the procedure for nonlinear analysis of amplifying reflectarray antenna is described and nonlinear analysis is verified by ADS software simulation. Moreover, a typical amplifying reflectarray antenna is designed considering t
Noise performance comparison between two different types of time-domain systems for microwave detection
Xuezhi Zeng, Albert Monteith, Andreas Fhager, Mikael Persson, Herbert Zirath
Published online : 01-04-2017
Article Access
View abstract
This paper compares the noise performance of two different types of time-domain microwave detection systems: a pulsed system and a pseudo-random noise sequence system. System-level simulations and laboratory-based measurements are carried out in the study. Results show that the effect of timing jitter is more significant on the measurement accuracy of the pseudo-random noise sequence system than t
Super-wideband and compact omnidirectional antenna with simple structure and improved radiation properties
X. Chen, L. Yang, L. Wang, G. Fu
Published online : 01-04-2017
Article Access
View abstract
A super-wideband (SWB) omnidirectional antenna is reported in Lau et al. in 2005 and 2008, but the antenna structure was complex and the radiation properties were unsatisfactory. In this paper, a SWB omnidirectional antenna with simple structure and improved radiation properties is presented. The antenna just consists of a two-stage inverted cone and two shorting pins. The proposed two-stage cone
Microstrip lowpass filter with wide stopband and sharp roll-off using modified radial stub resonator
Mohsen Hayati, Mehrnaz Khodadoost, Hamed Abbasi
Published online : 01-04-2017
Article Access
View abstract
In this paper, a microstrip lowpass filter with wide stopband and sharp roll-off is presented. The proposed filter consists of a modified radial stub resonator which is cascaded by four suppressing cells. To reduce the overall size, the transmission lines are folded. The cut-off frequency of the proposed filter is 1.19 GHz. The transition band is approximately 0.2 GHz from 1.19 to 1.39 GHz with co
Compact power divider based on half mode substrate integrated waveguide (HMSIW) with arbitrary power dividing ratio
Ali-Reza Moznebi, Kambiz Afrooz
Published online : 01-04-2017
Article Access
View abstract
Design and realisation of a compact power divider based on half mode substrate integrated waveguide (HMSIW) with an arbitrary power dividing ratio is presented. This design consists of a substrate integrated waveguide (SIW) transition, two bisected HMSIW transitions by a gap, an SIW-to-microstrip transition, and two microstrip feed lines. In addition, a resistor is attached between two HMSIW trans
A broad band circularly polarized cross slot cavity back array antenna with sequentially rotated feed network for improving gain in X-band application
Majid- Fakheri, Mohammad Naser-Moghadasi, Ramezan Ali- Sadeghzadeh
Published online : 01-04-2017
Article Access
View abstract
This paper presents a new broad band circularly polarized slot antenna array based on substrate-integrated waveguide (SIW) and aperture feeding techniques. The antenna element's impedance and 3 dB axial-ratio (AR) bandwidths are from 8.8 to 10.4 GHz (16.67%) and 9.5?10.7 GHz (12%), respectively. Employing aperture-coupled feed and combining this method with sequentially rotated network, a 2 × 2 an
Impedance transforming directional couplers with increased achievable transformation ratio
Jakub Sorocki, Ilona Piekarz, Krzysztof Wincza, Slawomir Gruszczynski
Published online : 01-04-2017
Article Access
View abstract
Novel impedance transforming directional couplers are proposed in which the achievable impedance transformation ratio is increased above the previously reported limit related to coupling of the coupled-line sections. The proposed couplers consist of two coupled-line sections between which uncoupled sections of left-handed lines are connected. The presented concept has been verified by circuit simu
Gain enhancement of wideband circularly polarized antenna using FSS
Nagendra Kushwaha, Raj Kumar
Published online : 01-04-2017
Article Access
View abstract
This paper presents a high gain, wideband circularly polarized (CP) antenna. High gain of the antenna is achieved by employing a frequency selective surface (FSS) as a reflector. The antenna is a coplanar waveguide-fed structure with a modified L-shaped radiating patch. The unit element of the FSS is formed by connecting two modified dipoles at an angle of 90°. The antenna with reflector has a mea
Design and analysis of miniaturized UWB antenna with tunable notched band
Priyanka Sharma, Kirti Vyas, Rajendra Prasad Yadav
Published online : 01-04-2017
Article Access
View abstract
We report in this paper a novel miniaturized (12 × 18 × 1.6 mm) microstrip fed UWB antenna with tunable notched band characteristics. The proposed antenna covers the tunable notched band for IEEE 802.11a wireless local area network operating in the frequency band of 5.15?5.825 GHz. The design of proposed antenna includes annular ring radiating patch with two T-shaped strips present inside it. The
A compact single layer branch-line coupler for ultra-wideband (UWB) applications
Sangeetha Velan, Malathi Kanagasabai
Published online : 01-04-2017
Article Access
View abstract
This paper presents the design of a compact, planar, single layer, tri-section ultra-wideband (UWB) branch-line (BL) coupler. The prototype offers 10 dB return loss characteristics from 3.1 to 13.7 GHz. Over a major portion of the band, phase imbalance of ±10° is achieved. The method of deploying multi stage impedance feed has been used to achieve improved bandwidth. To enhance the power output th
Design of a compact wide band microstrip antenna with very low VSWR for WiMAX applications
Aparna Kundu, Ujjal Chakraborty, Anup Kumar Bhattacharjee
Published online : 01-04-2017
Article Access
View abstract
A single-layer coaxial-fed compact rectangular microstrip antenna with very low voltage standing wave ratio (VSWR) is presented in this paper. The simulated VSWR of the proposed antenna 1.00374 is obtained near the center frequency of the operating band (3.5 GHz). Simulation and measurement results indicate that the bandwidth (simulated: 3.36?3.715 GHz, and measured: 3.295?3.645 GHz) of the antenn
Aperture-coupled ESPAR antenna with unique feed network for symmetric switched beam radiation patterns
Hassan Umair, Niaz Muhammad, Tayyab Hassan, Imran Rashid, Farooq A. Bhatti
Published online : 01-04-2017
Article Access
View abstract
Aperture-coupled ESPAR antenna with a unique feed structure for switched beam application has been presented. The feed structure provides control over surface current of the driven element with the help of which main lobe can be steered in desired direction. This control has been achieved through the use of PIN-diodes. Finite element method has been utilized for design and simulated and measured r
A compact CPW-fed wideband metamaterial-inspired antenna for GSM, WLAN/Wi-Fi, and WiMAX applications
Ashish Gupta, Raghvendra Kumar Chaudhary
Published online : 01-04-2017
Article Access
View abstract
A compact coplanar waveguide (CPW)-fed wideband metamaterial-inspired antenna is designed and developed in this paper. The proposed structure is an asymmetric structure in which three rectangular stubs are employed between signal patch and CPW ground plane. It is demonstrated that these stubs provides lumped parameters of conventional epsilon-negative transmission line (ENG-TL). As an advantage of
Small-size LTE/WWAN monopole antenna with octa-band operation for 4 G mobile phone
Jui-Han Lu, Ying-Sheng Fang
Published online : 01-04-2017
Article Access
View abstract
By introducing a modified F-shaped feeding strip and dual parasitic shorted strips, a small-size wireless wide area network/long-term evolution (WWAN/LTE) printed antenna is proposed and embedded in the 4 G mobile phone with octa-band operation. The operating impedance bandwidths (RL ? 6 dB) of 263/1093 MHz can be obtained across the LTE/WWAN bands, respectively. The overall antenna size of the pr
Microwave photonic network for active electronically scanned array radar
Manisha Mathur, Jaynendra Kumar Rai, Nilakantan Sridhar
Published online : 01-04-2017
Article Access
View abstract
Active electronically scanned array (AESA) radar has large number of T/R) modules which require multiple microwave and digital signals. Distribution of these signals through conventional method such as coaxial cable, twisted pair, etc. not only introduces engineering complexities and signal loss but also have limitation of bandwidth, data rate, transmission distance, etc. This paper addresses desi
Dielectric characterization using FEM modeling and ANNs for coaxial waveguide with conical open ended radiation
Mohamed Mounkid El Afendi, Mohamed Tellache, Junwu Tao, Bilal Hadjadji, Mouncef Benmimoune
Published online : 01-04-2017
Article Access
View abstract
Since last decades, microwaves have received tremendous attention as an interesting tool for material characterization. In general, standard microwave measurement methods require cutting and polishing of samples to put it in a suitable waveguide or cavity. However, several methods have been developed in order to permit a non-destructive measurement. A well-known method is based on coaxial open-end
Development of compact inductive coupled meander line RFID tag for near-field applications
Abhishek Choudhary, Krishan Gopal, Deepak Sood, Chandra Charu Tripathi
Published online : 01-05-2017
Article Access
View abstract
The development of compact radio frequency identification (RFID) tag is the key requirement for wireless tracking of precious small size goods/packages in transport. A design of compact meander line tag antenna having inductive coupling feed is presented for RFID system operating at ultra high frequency band of . The size of the proposed tag antenna is , and is designed using Higgs 4 IC chip (made
A switchable bandstop-to-bandpass reconfigurable filter for cognitive radio applications
Hamza Nachouane, Abdellah Najid, Abdelwahed Tribak, Fatima Riouch
Published online : 01-05-2017
Article Access
View abstract
This paper presents a simple reconfigurable bandpass filter switching from to based on PIN diodes. The proposed filter is intended to add frequency-tunability to antenna systems used in cognitive radio applications. It consists of a bent connecting stub with two open-circuited quarter-wave stubs grounded via PIN diodes. By controlling the didoes states, the electrical length of the stubs can be
Analysis and design of a triple band metamaterial simplified CRLH cells loaded monopole antenna
Mahmoud Abdelrahman Abdalla, Zhirun Hu, Cahyo Muvianto
Published online : 01-05-2017
Article Access
View abstract
The design and analysis of meta-material inspired loaded monopole antenna for multiband operation are reported. The proposed antenna consists of multi resonators inspired from half mode composite right/left handed cells, which has a simple structure, compact size, and provides multiband functionalities. As a proof of concept, a triple band antenna covering all possible WiMAX operating bands, has b
Microstrip antenna miniaturization with fractal EBG and SRR loads for linear and circular polarizations
Mohammad Sadegh Sedghi, Mohammad Naser-Moghadasi, Ferdows B. Zarrabi
Published online : 01-05-2017
Article Access
View abstract
In this paper, combination of electromagnetic band gap (EBG) and split-ring resonator (SRR) loads with fractal formation for miniaturization of microstrip antenna is noticed. Here two different shapes of antenna have been studied with two well-known metamaterial structures as parasitic elements. A conventional microstrip antenna, which is surrounded by four EBG unit cells, is chosen as the first a
Segmented quarter cylindrical dielectric resonator antenna: simulation and experimental investigation in composite form for wideband applications
Pinku Ranjan, Ravi Kumar Gangwar
Published online : 01-05-2017
Article Access
View abstract
A probe feed wideband multi-element dual segments quarter cylindrical dielectric resonator antenna (q-CDRA) in composite forms have been proposed. The q-CDRA has been introduced by splitting CDRA into four uniform quarters and multi-segmentation approach has been castoff for further improvement in bandwidth of q-CDRA. The dual segments q-CDRA has been designed and analyzed using theoretical analys
Novel SRR-loaded CPW-fed UWB antenna with wide band-notched characteristics
Haijun Peng, Chunhua Wang, Lv Zhao, Jun Liu
Published online : 01-05-2017
Article Access
View abstract
This paper presents the design of a split-ring resonators (SRR) loaded coplanar waveguide-fed ultra-wide band (UWB) antenna. As using the electromagnetic coupling SRR connected by open-ended microstrip lines, this UWB antenna achieves wide band-notched characteristics. The frequency of the proposed antenna operates from 2.37 to 10.93 GHz with a broad notch band covers from 4.96 to 6.15 GHz (IEEE 8
Compact modified ?T? slot circular patch quad band antenna for MIMO applications
Chithradevi Rajagopal, Sreeja Balakrishnapillai Suseela, Nafiza Noorullakhan, Radha Sankararajan
Published online : 01-05-2017
Article Access
View abstract
Compact modified T-slot circular patch antenna for multiple input multiple output MIMO) applications, which has good response for four operating frequency bands is developed. Here the design consists of a circular patch with a new slot loaded T- shape on one side of the substrate and a feeder line on the other side of the substrate. A shorting pin is located between the patch and the feeder line.
Fork-shaped planar antenna for Bluetooth, WLAN, and WiMAX applications
Alaknanda Kunwar, Anil Kumar Gautam
Published online : 01-05-2017
Article Access
View abstract
A microstrip transmission line fed fork-shaped planar antenna is proposed for Bluetooth, WLAN, and WiMAX applications. The antenna made of a microstrip feed line, fork-shape patch on one side and defected ground plane on the other side of dielectric substrate. A fork-shape is formed by two side circular arms and a rectangular central arm. The inverted T-shaped ground plane with a rectangular slot
0 document found for International Journal

ArtWhere Création de site Internet