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1030 documents found for International Journal
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
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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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