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1030 documents found for International Journal
Design of dual band-notched lamp-shaped antenna with UWB characteristics
Swati Yadav, Anil Kumar Gautam, Binod Kumar Kanaujia
Published online : 01-03-2017
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To restrict electromagnetic interference at WiMAX (3.3?3.7 GHz) and wireless local area network (WLAN) (5.15?5.825 GHz) bands operating within ultra wide bandwidth (UWB) band, a novel design of lamp-shaped UWB microstrip antenna with dual band-notched characteristics is presented. The proposed antenna is composed of a lamp-shaped radiating patch with two rectangular ground planes on both the sides
Novel star-shaped fractal antenna for multiband applications
Neeraj Rao, Ankit Malik, Rahul Kumar, Shobhit Goel, Dinesh Kumar V
Published online : 01-03-2017
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Fractals have unique properties such as self-similarity and space-filling. The use of fractal geometry in antenna design provides a good method for achieving the desired miniaturization, multi-band, and wideband properties. In this communication, novel fractal geometry is proposed based on which a multiband antenna is designed. The proposed antenna has fractal patches which are shaped as different
Dual/wideband hybrid DRA with reconfigurable operation
Ravi Dutt Gupta, Manoj Singh Parihar
Published online : 01-03-2017
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In this paper, a rectangular dielectric resonator antenna (DRA) with a parasitic gap-coupled microstrip resonator (MSR) is investigated; analytically, and experimentally. The proposed antenna uses an open-ended half-wavelength MSR patch as a hybrid radiator. Radiating modes are identified for both the radiators. Two separate and fully independent modes are merged together to get an enhanced bandwi
MEMS-based LC tank with extended tuning range for low phase-noise VCO
Alessandro Cazzorla, Paola Farinelli, Laura Urbani, Fabrizio Cacciamani, Luca Pelliccia, Roberto Sorrentino, Flavio Giacomozzi, Benno Margesin
Published online : 01-03-2017
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This paper presents the modeling, manufacturing, and testing of a micro-electromechanical system (MEMS)-based LC tank resonator suitable for low phase-noise voltage-controlled oscillators (VCOs). The device is based on a variable MEMS varactor in series with an inductive coplanar waveguide line. Two additional parallel stubs controlled by two ohmic MEMS switches have been introduced in order to in
Dual-band-notched antenna for UWB MIMO applications
Zamir Wani, Dinesh Kumar
Published online : 01-03-2017
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In this report, a compact antenna system with dual-band-notched characteristics is proposed for ultra-wideband (UWB) multiple-input multiple-output (MIMO) applications. Two antenna elements are placed side by side and fed with matched microstrip lines on a substrate with an area of 35 × 30 mm. Notched characteristics at WiMAX (3.4?3.6 GHz) and WLAN (5.725?5.825 GHz) have been achieved using comple
CPW-fed circular-shaped fractal antenna with three iterations for UWB applications
Sarthak Singhal, Ankit Pandey, Amit Kumar Singh
Published online : 01-03-2017
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A coplanar waveguide (CPW)-fed circular-shaped fractal antenna with third iterative orthogonal elliptical slot for ultra-wideband applications is presented. The bandwidth is enhanced by using successive iterations of radiating patch, CPW feedline, and tapered ground plane. An impedance bandwidth of 2.9?20.6 GHz is achieved. The designed antenna has omnidirectional radiation patterns along with ave
Wideband dipole antenna using multi-mode resonance concept
Wen-Jun Lu, Lei Zhu, Kam Weng Tam, Hong-Bo Zhu
Published online : 01-03-2017
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Wideband dipole antennas are proposed using the multi-mode resonance concept. By symmetrically introducing one-pair or two-pair of stubs at the nulls of current distribution of the second odd-order mode, two radiation modes are excited in a single, center-fed dipole resonator. Using these stubs, the second odd-order mode gradually moves down to its first counterpart, resulting to achieve a wideban
Novel compact dual-band-notched ultra-wideband printed antenna with a parasitic circular ring strip
Zhijun Tang, Xiaofeng Wu, Zaifang Xi, Shigang Hu
Published online : 01-03-2017
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A simple and compact printed ultra-wideband antenna with dual-band-notched characteristics is presented. The proposed antenna is composed of a rectangular patch and a modified ground plane. The rectangular patch is etched onto a lossy FR4 substrate. A circular ring strip parasitizes the rectangular patch embedded by a U-shaped slot. Two inverted-L slits and a rectangular slit are embedded onto the
Reduction of the mutual coupling in patch antenna arrays based on EBG by using a planar frequency-selective surface structure
Ehsan Beiranvand, Majid Afsahy, Vahid Sharbati
Published online : 01-03-2017
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This paper describes a new configuration of frequency-selective structure (FSS) structures to reduce mutual coupling between the radiating elements. Also, the antenna performance before and after the implementation of FSS have been investigated. The proposed configuration provides an improvement in mutual coupling by 14 dB (measured value) with a reduced edge-to-edge spacing of 23 mm. The reductio
Dual-band linearly and circularly polarized microstrip patch antennas with meandering slot and metallic vias
Jin Zhang, Xianqi Lin, Jiawei Yu, Liying Nie
Published online : 01-03-2017
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Patch antennas with a meandering slot and different distributions of grounded metallic vias are presented in this paper. The meandering slot is adopted to stimulate dual-band operation, while the number and position of the grounded metallic vias are suggested to achieve different radiation performances. The characteristics are analyzed in detail where we find that the existence of the vias also im
Design of a CPW-fed UWB printed antenna with dual notch band using mushroom structure
Tapan Mandal, Santanu Das
Published online : 01-03-2017
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A coplanar waveguide-fed planar hexagonal monopole ultra-wideband antenna with dual-band rejection characteristics is proposed in this paper. The desired notch frequencies at 3.5 and 5.5 GHz are realized by incorporating mushroom structures. The input impedance and surface current distributions are used for analysis and explanation of the effects of mushroom cells. The prototype and proposed anten
A planar multiband Koch snowflake fractal antenna for cognitive radio
S. Sivasundarapandian, C.D. Suriyakala
Published online : 01-03-2017
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This paper of lettering reveals about a modified Koch snowflake fractal multiband antenna for cognitive radio applications. Multiband antennas can be employed for spectrum sensing in cognitive radio. This new microstrip-modified Koch fractal antenna exhibits multiple actions in four dissimilar resonant frequencies at 3.2, 5.2, 6, and 9.5 GHz correspondingly that covers the frequency bands such as
Compact modified circular patch quad-band MIMO antenna with high isolation and low correlation
Chithradevi Rajagopal, Nafiza Noorullakhan, Sreeja Balakrishnapillai Suseela, Radha Sankararajan
Published online : 01-04-2017
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A compact quad band slot antenna with high isolation suitable for multiple-input?multiple-output (MIMO) applications is developed. The quad bands are achieved by introducing slots in a modified, size reduced circular patch antenna. The single-antenna element consists of a substrate sandwiched between a modified circular patch with F shape slot, a feeder line and a via running between the radiating
UWB MIMO antenna with common radiator
Garima Srivastava, B. K. Kanuijia, Rajeev Paulus
Published online : 01-04-2017
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A compact printed 2 × 2 ultrawideband UWB multiple input multiple output MIMO antenna with a single circular patch as a common radiator for both the antenna elements is presented in this paper. A single circular patch is excited by two tapered CPW feeds for dual polarization. To improve the isolation between two ports, a rectangular slot of dimension L × W is created in the radiator. The UWB MIMO
MRF volume 9 issue 2 Cover and Back matter
Published online : 01-02-2017
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MRF volume 9 issue 2 Cover and Front matter
Published online : 01-02-2017
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Novel electromagnetic bandgap structure to mitigate simultaneous switching noise for mixed-signal system applications
Vasudevan Karuppiah, Raju Srinivasan
Published online : 01-03-2017
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This paper proposes a novel T-shape electromagnetic bandgap (EBG) structure to suppress simultaneous switching noise (SSN) in mixed-signal systems. Noise is generated due to simultaneous switching multiple drivers in the digital ICs. It is called as SSN. It could propagate between power and ground planes of underlying PCB platform and interfere with the functionality of nearby RF/Analog ICs. So, t
Millimeter wave antenna with frequency selective surface (FSS) for 79 GHz automotive radar applications
Basem Aqlan, Hamsakutty Vettikalladi, Majeed A.S. Alkanhal
Published online : 01-03-2017
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In this paper a high gain aperture-coupled membrane antenna with a frequency selective surface (FSS) on a superstrate layer has been investigated. The base membrane antenna consists of a microstrip patch on the top of Roger RT-5580 substrate, supported by FR4 and is excited through an aperture fed by substrate-integrated waveguide (SIW). The CST Microwave Studio simulation results show that the pr
Room shielding with frequency-selective surfaces for electromagnetic health application
Soheil Hashemi, Ali Abdolali
Published online : 01-03-2017
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Use of frequency-selective surfaces (FSSs) is proposed to shield rooms against electromagnetic fields in order to achieve secure indoor communications and reduce human exposure to external fields. The secure room is designed using two-layer FSSs with an FR4 substrate to cover 10?12 GHz frequency band. Different elements in each layer and shift in the position of elements are the reasons for more t
Compact dual-band bandpass filter using open stub-loaded stepped impedance resonator with cross-slots
Bukuru Denis, Kaijun Song, Fan Zhang
Published online : 01-03-2017
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A compact dual-band bandpass filter using stub-loaded stepped impedance resonator (SLSIR) with cross-slots is presented. The symmetric SLSIR is analyzed using even- and odd-mode techniques. Design equations are derived and they are used to guide the design of the circuits. Two passbands can be easily tuned by cross-slots and open stubs. Transmission zeros among each passbands are created, resultin
An optimized ink-reducing hollowed-out arm meander dipole antenna structure for printed RFID tags
Adi M. J. Marindra, Pornanong Pongpaibool, Werayuth Wallada, Siwaruk Siwamogsatham
Published online : 01-03-2017
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This paper presents an optimized ink-reducing meander dipole antenna structure suitable for implementing printed radio frequency identification (RFID) tags. The proposed antenna designs contain empty ink-reducing hollowed-out areas along the antenna's arms such that the resulting antennas require much less conductive ink to produce yet still achieve decent antenna performance compared with the con
Analysis of an integrated lens antenna fed by SIW slot array using a hybrid MoM?PO method
Reza Bayderkhani, Keyvan Forooraghi, Emilio Arnieri, Bijan Abbasi-Arand, Bal S. Virdee
Published online : 01-03-2017
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This paper presents a very fast and highly efficient full-wave hybrid method for analyzing an integrated dielectric lens antenna (ILA) fed by multilayered substrate-integrated waveguide (SIW) slot antenna/array. The feeding antenna structure is modeled as a stacked parallel-plate waveguide with metallic posts, coupling, and radiating slots. Physical optics method in conjunction with three-dimensio
Design of center-fed printed planar slot arrays
L. Potgieter, J. Joubert, J. W. Odendaal
Published online : 01-03-2017
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A design approach for printed planar slot array antennas is presented. The antenna array consists of half-wavelength slot radiators positioned on a rectangular grid, and a slotline feed network. Three planar slot array antennas for use in IEEE 802.11a applications are designed, a 2 × 2, a 2 × 4, and a 4 × 2 array, all radiating above an electric conductor ground plane placed a quarter-wavelength b
Theoretical study of liquid crystal dielectric-loaded plasmonic waveguide
Hamed Armand, M. Dashti Ardakani
Published online : 01-03-2017
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A fully two-dimensional theoretical study of the electromagnetic wave propagation through Metal?Liquid Crystal?Metal (M?LC?M) waveguide structure is presented. Dispersion relations corresponding to both symmetric and antisymmetric-coupled surface plasmons polaritons modes in M?LC?M structure are derived and numerically solved. The effects of LC tilt angles on the effective refractive index and pro
Arc-cornered microstrip antenna with defected ground structure for broad banding and improved cross-polarization suppression over whole skew planes
Subhradeep Chakraborty, Sudipta Chattopadhyay
Published online : 01-03-2017
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Defected ground structure (DGS)-integrated arc-cornered rectangular microstrip antenna (RMA) has been investigated to achieve broadband along with high co-polarized to cross-polarized radiation (CP?XP) isolation over principal as well as over skew planes without affecting the dominant mode co-polarized (CP) radiation pattern. The present arc-cornered RMA on circular and rectangular dot-type DGS is
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