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1355 documents found for International Journal
MRF volume 12 issue 4 Cover and Back matter
Published online : 01-05-2020
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MRF volume 12 issue 4 Cover and Front matter
Published online : 01-05-2020
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Planar 180° hybrid coupler with non-interspersed ports for millimeter-wave applications
Jaber Moghaddasi, Ke Wu
Published online : 01-05-2020
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This paper presents a simple topology of 180° hybrid coupler with non-interspersed inputs and outputs, as opposed to the conventional rat-race topology. Such hybrid coupler topologies with inputs located on one side and outputs at the opposite side simplify the design of signal routings and module packaging when integrated with other circuits and components. It also relaxes the necessity of using
A wideband dielectric resonator antenna with switchable diversity patterns
Ahmad Abdalrazik, Adel B. Abdel-Rahman, Ahmed Allam, Mohammed Abo-Zahhad
Published online : 01-05-2020
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In this paper, a reduced-size dielectric resonator antenna with switchable diversity patterns is proposed. Ring- and linear-shaped slots are etched in the ground plane of the antenna so as to generate two modes and at a center frequency of 19 GHz. Moreover, two groups of PIN diodes are integrated into these slots to short one group of slots, and let the other group generates the required mode. T
Circularly polarized ferrite patch antenna for LEO satellite applications
E. Arnaud, L. Huitema, R. Chantalat, A. Bellion, T. Monediere
Published online : 01-05-2020
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This paper presents the capacity of an S band circularly polarized patch antenna using a ferrite material for low-earth orbiting satellites (2025?2100 MHz for TeleCommand) to obtain a semi-isotropic radiation pattern. Indeed, circularly polarized antennas are generally large and bulky which is often incompatible for spatial applications especially for small satellites. A new antenna design is prop
High-isolation diplexer based on dual-mode substrate integrated waveguide resonator
Kaijun Song, Mou Luo, Cuilin Zhong, Yuxuan Chen
Published online : 01-05-2020
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A high-isolation diplexer based on a dual-mode substrate integrated waveguide (SIW) resonator is proposed in this paper. Based on the theory of the dual-mode resonator, the miniaturized diplexers are designed by using the SIW dual-mode resonators. The superior isolation of the diplexers is obtained because the two operating modes of the dual-mode SIW resonators are not directly coupled and there i
Novel sunflower MIMO fractal antenna with low mutual coupling and dual wide operating bands
Amer T. Abed
Published online : 01-05-2020
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A novel multiple-input and multiple-output (MIMO) fractal antenna excited by a coplanar waveguide was investigated in this study. A novel technique was used to improve the isolation of 20 dB between the dual radiating elements by inserting a strip line into the outer edges of the ground plane. A sunflower structure was used to configure the antenna in three steps. At each step, an additional sunfl
Center frequency and bandwidth switchable substrate integrated waveguide filters
Fei Cheng, Ping Lu, Kama Huang
Published online : 01-05-2020
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This paper presents center frequency and bandwidth switchable substrate integrated waveguide filters loaded with PIN diodes. The diodes are added in the slot on the surface of the resonators to switch the resonant frequencies and the coupling coefficients. Although the introduction of the slot causes extra radiation loss, it is small and acceptable. The proposed center frequency switchable filter
Target range?angle estimation based on time reversal FDA-MIMO radar
Tong Mu, Yaoliang Song
Published online : 01-05-2020
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Different from traditional multiple-input and multiple-output (MIMO) radar, the frequency diverse array MIMO (FDA-MIMO) radar generates beampattern that is dependent on both range and angle, making it applicable for joint range?angle estimation of targets. In this paper, we propose a novel time reversal based FDA-MIMO (TR-FDA-MIMO) approach for target detection. Based on the time reversal theory,
A low-profile wideband circularly polarized MIMO antenna with pattern and polarization diversity
Prashant Chaudhary, Ashwani Kumar, B. K. Kanaujia
Published online : 01-05-2020
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The present work describes a unique planar low-profile wideband circularly polarized Multiple-Input and Multiple-Output (MIMO) antenna operating in the X-band, with pattern and polarization diversity over the entire axial-ratio bandwidth (ARBW). The design is unique in the sense that a simple grounded stub introduced between two linearly polarized monopole antennas has been used to realize wideban
Quintuple-mode wideband bandpass filters with improved out-of-band rejection
Musab Hameed, Gaobiao Xiao, Lina Qiu, Tayyab Hameed
Published online : 01-05-2020
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This paper presents design of quintuple-mode wideband bandpass filters, implemented with off-centered perturbed metallic cylinders in a rectangular waveguide cavity. Three perturbation cylinders are placed at the bottom of the rectangular waveguide cavity, along with a pair of perpendicularly fed coaxial lines; excite five quasi-transverse magnetic modes to realize the desired passband. The height
Dual band circular polarized bow tie slotted patch antenna over high impedance surface for WiMAX application
Kumar Goodwilll, Neha Singh, M.V. Kartikeyan
Published online : 01-05-2020
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A novel planar dual-band bow-tie slotted patch antenna backed by high-impedance surface (HIS) is designed at 2.5 and 3.5 GHz for wireless application. The antenna employs coplanar waveguide fed patch and bow-tie slot as radiating elements. The bow-tie slot enables dual-band operation for the antenna. The HIS is made asymmetric in design to make it polarization dependent. This polarization-dependen
Wireless sensor node remote supply using a compact stacked rectenna array with voltage multipliers at 2.45 GHz
Hichem Mahfoudi, Hakim Takhedmit, Mohamed Tellache, Sebastien Boisseau
Published online : 01-05-2020
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This paper presents compact rectenna arrays for ambient RF energy harvesting on the 2.45 GHz ISM band. The arrays are based on four and nine series-connected rectenna cells. Each cell is composed of a stacked fractal antenna and an RF-to-dc conversion circuit. The antenna is a compact third Koch fractal shape, fed by a coaxial probe for more compactness. The conversion circuit is a full-wave recti
MRF volume 12 issue 3 Cover and Back matter
Published online : 01-04-2020
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MRF volume 12 issue 3 Cover and Front matter
Published online : 01-04-2020
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Triple-band operation achievement via multi-input multi-output antenna for wireless communication system applications
T. Azari-Nasab, CH. Ghobadi, B. Azarm, M. Majidzadeh
Published online : 01-04-2020
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A multi-input multi-output (MIMO) antenna is designed and discussed for multi-band applications. The constituent antennas are composed of four L-shaped elements and a ground plane. When placed beside each other to form a MIMO antenna, a T-bar shaped parasitic structure is also embedded between the antennas on the backside of the substrate to increase the inter-element isolation. The triple-band pe
Compact UWB monopole antenna with reconfigurable band-notch characteristics
Liping Han, Jing Chen, Wenmei Zhang
Published online : 01-04-2020
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A compact ultra-wideband (UWB) monopole antenna with reconfigurable band-notch characteristics is demonstrated in this paper. It is comprised of a modified rectangular patch and a defected ground plane. The band-notch property in the WiMAX and WLAN bands is achieved by etching an open-ended slot on the radiating patch and an inverted U-shaped slot on the ground plane, respectively. To obtain the r
Circular-shaped differential wideband band pass filter
Dharmendra Kumar Jhariya, Akhilesh Mohan, Rahul Kaushik, Vishal Narain Saxena
Published online : 01-04-2020
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The design of a circular-shaped differential wideband band pass filter (BPF) is described. The proposed filter is compact and provides good common mode (CM) suppression. It consists of four ports with a circular-shaped differential mode (DM). The analysis of the filter has been carried out by bisecting it into identical two-port networks along the symmetry plane, resulting in a band stop or band p
Near-field to far-field transformation applied to UHF antennas over lossy ground
Nicolas Bourey, Muriel Darces, Yves Chatelon, Marc Hélier
Published online : 01-04-2020
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This paper deals with a near-field to far-field transformation able to predict the radiation of UHF antennas located over a lossy ground. From near-field measurements, an equivalent set of dipole sources is obtained as a model of the characterized antenna. The paper details the main steps of the transformation and describes the specific experimental set-up designed for the application. Simple dir
Tri-beam slot antenna array based on substrate integrated waveguide (SIW) technology
Zhenye Wang, Xiwang Dai, Wen Sun
Published online : 01-04-2020
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A novel tri-beam slot antenna array based on substrate integrated waveguide (SIW) technology is proposed in this paper. The beam forming network is a 3 × 3 Butler matrix consisted of three couplers and four phase shifters. A 1.76 dB coupler is located between two 3 dB couplers, with this arrangement; the input signal can be divided into three parts with the same amplitude and certain phase differe
Design of subwavelength metamaterial resonator based on new self-coupling strategy
Larbi Benkhaoua, Smail Mouissat, Mohamed Taoufik Benhabiles, Mohamed Lahdi Riabi
Published online : 01-04-2020
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In this paper, edge-broad-side coupled spiral resonator (EBC-SR) is proposed to enhance the miniaturization of the metamaterial resonators. After a comparative analysis, it is found that the proposed strategy can drastically reduce the electrical size of metamaterial resonators. This is due to the use, at the same time, advantages of edge coupling, broad-side coupling, and self-coupling. A lumped
An X-band magnetic dipole quasi-Yagi antenna based on a dielectric resonator
Zhong-Yu Qian, Wen-Jian Sun, Xue-Feng Zhang, Jian-Xin Chen
Published online : 01-04-2020
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A magnetic dipole quasi-Yagi antenna based on a dielectric resonator (DR) is proposed in this letter. The dominate TE mode of the rectangular DR is used as a magnetic dipole which can be differentially fed by the coplanar strip line (CPS). Thanks to the DR employment, the proposed antenna has several advantages such as compact size and flexible design which means the 3-D dimensions of the DR can b
Slot loaded EBG-based metasurface for performance improvement of circularly polarized antenna for WiMAX applications
Alka Verma, Anil Kumar Singh, Neelam Srivastava, Shilpee Patil, Binod Kumar Kanaujia
Published online : 01-04-2020
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In this paper, an electromagnetic band gap (EBG) metasurface (MS) superstrate-based circularly polarized antenna for the WiMAX (3.5 GHz) band is proposed. The proposed structure comprises a 2 × 2 slot-loaded rectangular patch MS array that can be perceived as a polarization-dependent EBG MS superstrate. Furthermore, to achieve circular polarization, the proposed antenna has an inclined coupling sl
Analysis and design of TEM-TE coaxial waveguide bend mode converters
Qiang Zhang, Xuhao Zhao, Chengwei Yuan, Jiande Zhang
Published online : 01-04-2020
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Two coaxial waveguide bend mode converters that transform coaxial transverse electromagnetic mode to TE coaxial waveguide mode are presented in this paper. Both converters are designed and optimized on the basis of the strictly derived mode coupling coefficients. Conversion efficiencies of both converters are over 99% and the power-handling capacities reach a gigawatt level. The combined dual-bend
Design and analysis of a tri-band frequency selective surface with a second-order response
Chunyan Gao, Hongbin Pu, Shan Gao, Chunlan Chen, Yong Yang
Published online : 01-04-2020
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In this paper, a sandwiched type frequency selective surface (FSS) is designed and analyzed. The design procedure and operating principle is given based on the equivalent circuit model. The proposed FSS includes two identical layers of periodic metallic arrays, which are separated by a foam layer. In each layer of the periodic array, the unit cell is composed of a gridded-triple square loop struct
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