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967 documents found for International Journal
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
Dual-band low-profile planar antenna for mobile communication application
Xi-Wang Dai, Tao Zhou, Bo-Ran Guan
Published online : 01-03-2017
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A novel dual-band planar antenna with a low profile for mobile communication system is proposed in this paper. The antenna is composed of one shorted patch with two radiating notches for low frequency resonance and one square patch for high frequency resonance. The low profile is achieved via the shorting patch, which introduces the parallel electrical field between the reflector and antenna. A st
Position gauging of welding joints with an FMCW-based mm-wave radar system
Jochen O. Schrattenecker, Stefan Schuster, Christian M. Schmid, Werner Scheiblhofer, Helmut Ennsbrunner, Andreas Stelzer
Published online : 01-03-2017
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This paper presents a position gauging system of welding joints. While the principle measurement concept was already introduced by Schrattenecker et al. in , here it is focused on different types of practically used welding materials. The sensor used is based on the frequency-modulated continuous-wave principle operating in the W-band. Position estimation (PoE) of different welding geometries is c
Frequency and time domain analysis of a novel UWB antenna with dual band-notched characteristics
Rajarshi Sanyal, Abhirup Patra, Parthapratim Sarkar, Santosh Kumar Chowdhury
Published online : 01-03-2017
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This paper presents the dual band notch characteristics of Ultra wideband (UWB) monopole antenna. Proposed antenna (30 × 30 mm) consists of arrow shaped patch and truncated ground plane. Operating range of the proposed antenna (voltage standing wave ratio < 2) is 2.2?11 GHz. In order to achieve dual band stop characteristics, ?/2 open ended angularly separated slit pair has been inserted on the ra
Single layer single probe feed circularly polarized triple band fractal boundary microstrip antenna for wireless applications
V.V. Reddy, N.V.S.N. Sarma
Published online : 01-04-2017
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Triple band circularly polarized fractal boundary microstrip antenna is proposed and experimentally studied. The two orthogonal sides of the square patch are replaced with asymmetrical fractal curves for circular polarization (CP) radiation. A 45° rotated asymmetrical fractal slot is embedded at the center of the fractal patch for triband CP operation. The indentation factors of the fractal curves
The d-Radar: a bistatic system based on conformal arrays
Gaspare Galati, Paola Carta, Mauro Leonardi, Francesco Madia, Rossella Stallone, Stefania Franco
Published online : 01-04-2017
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Multifunction radars based on active phased arrays are well known and widely studied systems. The concepts of bistatic architecture, conformal array and digital beam forming (DBF) are combined in this paper to define a novel multifunction radar for point defense. The conical shape of the antenna overcomes the significant limitations in the azimuth coverage of 360° of fixed-faces phased arrays due
A printed wide-beamwidth circularly polarized antenna via two pairs of radiating slots placed in a square contour
Neng-Wu Liu, Lei Zhu, Wai-Wa Choi
Published online : 01-04-2017
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A low-profile circularly polarized (CP) slot antenna to achieve a wide axial-ratio (AR) beamwidth is proposed in this paper. The radiating patch consists of two orthogonal pairs of parallel slots etched symmetrically onto a ground plane. Firstly, our theoretical study demonstrates that the CP radiation can be satisfactorily achieved at the broadside, when the vertical and horizontal paired-slots a
Quarter cylindrical dielectric resonator antenna in multi-element composite form for wideband applications
Pinku Ranjan, Ravi Kumar Gangwar
Published online : 01-04-2017
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A novel quarter cylindrical dielectric resonator antenna (q-CDRA) has been introduced by splitting four uniform quarters from a cylinder. q-CDRA has been designed and validated with theoretical analysis. Two and four element q-CDRAs have been proposed in composite forms through Ansoft high-frequency structure simulator simulation software and fabricated for experimental investigation. The input ch
Omnidirectional multi-band stacked microstrip patch antenna with wide impedance bandwidth and suppressed cross-polarization
Jaishanker Prasad Keshari, Binod Kumar Kanaujia, Mukesh Kumar Khandelwal, Pritam Singh Bakariya, Ram Mohan Mehra
Published online : 01-04-2017
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In this paper, triple-band stacked microstrip patch antennas (MPAs) are presented with wide impedance bandwidth and suppressed cross-polarization level. Triangular and circular shaped slots are embedded in the patch of antenna. Slot-loaded microstrip patches are fed with meandered microstrip line supported by a semi-ground plane structure. Triangular shaped slot-loaded MPA shows triple resonance a
Low-profile U-shaped DRA for ultra-wideband applications
Idris Messaoudene, Tayeb A. Denidni, Abdelmadjid Benghalia
Published online : 01-04-2017
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In this paper, a microstrip-fed U-shaped dielectric resonator antenna (DRA) is simulated, designed, and fabricated. This antenna, in its simple configuration, operates from 5.45 to 10.8 GHz. To enhance its impedance bandwidth, the ground plane is first modified, which leads to an extended bandwidth from 4 to 10.8 GHz. Then by inserting a rectangular metallic patch inside the U-shaped DRA, the band
Design of ultra compact dual-band bandpass filter using -shaped resonator
Yeganeh Pourasad, Gholamreza Karimi
Published online : 01-04-2017
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A compact dual-band microstrip bandpass filter (BPF) is presented for application at the frequencies 2.4 and 5.84 GHz. The proposed main resonator consists of two L-shaped resonators. To improve the upper-stopband of the proposed filter, modified U-Shaped resonators are accepted. The operation mechanism of the filter is investigated based on proffered equivalent-circuit model and transformation fu
Neurospectral computation for the resonant characteristics of microstrip patch antenna printed on uniaxially anisotropic substrates
Lamia Barkat, Sami Bedra, Tarek Fortaki, Randa Bedra
Published online : 01-04-2017
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Modeling and design of rectangular microstrip patch printed on isotropic or anisotropic substrate are accomplished in this paper. The use of spectral domain method in conjunction with artificial neural networks (ANNs) to compute the resonant characteristics of rectangular microstrip patch printed on isotropic or anisotropic substrates. The moment method implemented in the spectral domain offers go
Study on miniaturization of planar monopole antenna with parabolic edge shape with a notch slot
Tae-Soon Chang, Sang-Won Kang
Published online : 01-04-2017
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This paper proposes a planar monopole antenna with a parabolic edge shape. This antenna, which has notch characteristics in the wireless local area network (WLAN) band, can be miniaturized. To obtain the notch characteristics in the WLAN band, a slot with a parabolic edge shape identical to that of the monopole structure was implemented. Because the planar monopole antenna with a parabolic edge sh
Miniaturized curved slotted patch antenna over a fractalized EBG ground plane
Saurabh Kumar, Dinesh Kumar Vishwakarma
Published online : 01-04-2017
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In this paper, a miniaturized coaxial feed curved-slotted microstrip patch antenna over a fractalized uniplanar compact electromagnetic bandgap (F-UC-EBG) ground plane is proposed and investigated. Compact size is achieved by cutting the curved slots along the orthogonal directions of the patch radiator. The curved-slotted microstrip patch antenna is 38.30% miniaturized as compared with the conven
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