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1382 documents found for International Journal
MRF volume 12 issue 6 Cover and Back matter
M. Sierra Castaner, S. Monni
Published online : 01-07-2020
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MRF volume 12 issue 6 Cover and Front matter
M. Sierra Castaner, S. Monni
Published online : 01-07-2020
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EuCAP 2019 special issue
M. Sierra Castaner, S. Monni
Published online : 01-07-2020
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Experimental investigation of beam-steering applied to 2 × 2 MIMO system with single receiving RF chain and time-modulated antenna array
Grzegorz Bogdan, Konrad Godziszewski, Yevhen Yashchyshyn
Published online : 01-07-2020
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Multiple antennas and multiple radio frequency (RF) chains in both the transmitter and receiver are required in conventional radio systems employing the multiple-input multiple-output (MIMO) method. This paper presents an experimental investigation of a beam-steering time-modulated MIMO receiver with a single RF chain. Implementation of the receiver is based on a time-modulated antenna array (TMAA
Channel characterization of a dual-band dual-polarized SAR with digital beamforming
Emilio Arnieri, Luigi Boccia, Giandomenico Amendola, Srdjan Glisic, Chun-Xu Mao, Steven (Shichang) Gao, Tobias Rommel, Piotr Penkala, Milos Krstic, Uroschanit Yodprasit, Anselm Ho, Oliver Schrape, Marwan Younis
Published online : 01-07-2020
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This paper presents the integration and channel characterization of a highly integrated dual-band digital beamforming space-borne synthetic aperture radar (SAR) receiver. The proposed SAR sensor is a low-cost, lightweight, low-power consumption, and dual-band (X/Ka) dual-polarized module ready for the next-generation space-borne SAR missions. In previous works, by the authors, the design and exper
Numerical and experimental analysis of a transmission-based breast imaging system: a study of application to patients
Elham Norouzzadeh, Somayyeh Chamaani, Jochen Moll, Christian Kexel, Duy Hai Nguyen, Frank Hübner, Babak Bazrafshan, Thomas J. Vogl, Viktor Krozer
Published online : 01-07-2020
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Early detection of breast cancer is required to increase the chances of a successful treatment. However, current breast-imaging systems such as X-Ray mammography, breast ultrasound, and magnetic resonance imaging have technological limitations so that novel solutions are needed to address this major societal problem. The current paper considers ultra-wideband (UWB) microwave radiation in the frequ
Design and qualification of Ku-band-radiating chains for receive active array antennas of flexible telecommunication satellites
Vincenzo Pascale, Davide Maiarelli, Luciano D'Agristina, Nicola Gatti
Published online : 01-07-2020
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Airbus Italia recently developed enhanced passive components as key elements for its telecommunication Ku-band antenna product lines, tailored to reconfigurable payloads. This paper describes the design and qualification of a dual linear polarization Ku-band-radiating chain, developed for the DRA receive (Rx) active antennas embarked on the Eutelsat Quantum satellite. The feed chain covers the ent
Design and characterization of a dual-band miniaturized circular antenna for deep in body biomedical wireless applications
Shuoliang Ding, Stavros Koulouridis, Lionel Pichon
Published online : 01-07-2020
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In this paper, a novel miniaturized implantable circular antenna is presented. It supports both wireless information communication and wireless energy transmission at the Medical Device Radiocommunication band (MedRadio 402?405 MHz) and the industrial, scientific, and medical bands (ISM 902.8?928 MHz). The antenna is circular to avoid sharp edges while miniaturization is achieved by adding two cir
Guided electromagnetic waves for damage detection and localization in metallic plates: numerical and experimental results
Jochen Moll
Published online : 01-07-2020
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Electromagnetic waves in the microwave and millimeter-wave frequency range are used in non-destructive testing and structural health monitoring applications to detect material defects such as delaminations, cracks, or inclusions. This work presents a sensing concept based on guided electromagnetic waves (GEW), in which the waveguide forms a union with the structure to be inspected. Exploiting ultr
A flexible broadband antenna for IoT applications
Abdullah Al-Sehemi, Ahmed Al-Ghamdi, Nikolay Dishovsky, Gabriela Atanasova, Nikolay Atanasov
Published online : 01-07-2020
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A flexible broadband antenna with high radiation efficiency for the Internet of Things (IoT) applications is presented. The design is based on a U-shaped and a triangular-shaped radiator with two tuning stubs. A 50 ? coplanar waveguide (CPW) transmission line is employed to feed the antenna. The proposed antenna is fabricated on a flexible substrate from a composite synthesized by mixing natural r
Optimization of inscribed hexagonal fractal slotted microstrip antenna using modified lightning attachment procedure optimization
Rohit Anand, Paras Chawla
Published online : 01-07-2020
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An inscribed hexagonal fractal slotted patch antenna with some additional geometry and slots is proposed for the optimization in this paper. This research work is concerned with the optimization of this slotted fractal antenna with the help of the curve-fitting method in conjunction with the modified version of Lightning Attachment Procedure Optimization (MLAPO) technique. The data required for th
Probe-corrected near-field to far-field transformation using multiple spherical wave expansions
Fernando Rodríguez Varela, Belén Galocha Iragüen, Manuel Sierra Castañer
Published online : 01-07-2020
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Near-field to far-field transformations constitute a powerful antenna characterization technique for near-field measurement scenarios. In this paper, a near-field to far-field transformation technique based on multiple spherical wave expansions (SWEs) is presented. Thanks to its iterative matrix inversion nature, the approach performs the transformation of fields measured on arbitrary surfaces. Al
Experimental validation of a dual-receiver radar architecture for snowpack monitoring
Marco Pasian, Pedro Fidel Espín-López, Lorenzo Silvestri, Massimiliano Barbolini, Fabio Dell'Acqua
Published online : 01-07-2020
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Microwave radars can be used to monitor the internal structure of the snowpack, delivering real-time and non-destructive measurements. Recently, the working principle of an innovative radar architecture able to identify some of the most important snowpack parameters, without external aids, has been demonstrated. A key point of this new architecture is the use of two independent receiving antennas,
A new compact and wideband CPW-fed sleeve antenna
Peyman Hasani, Seyed Mohammad Hashemi, Javad Ghalibafan
Published online : 01-07-2020
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In this article, a sleeve antenna with a wide impedance bandwidth that consists of a coplanar waveguide line connected to a metallic cylinder is presented. The effect of design parameters on the impedance bandwidth is considered by some simulations. In addition to the wide impedance bandwidth, the omnidirectional pattern, high efficiency, low cost and easy fabrication process, and compact dimensio
MRF volume 12 issue 5 Cover and Back matter
Published online : 01-06-2020
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MRF volume 12 issue 5 Cover and Front matter
Published online : 01-06-2020
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Compact SIW directional filter using substrate integrated circular cavities
Mohammad Sajjad Bayati, Tahsin Khorand
Published online : 01-06-2020
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In this paper, a novel directional filter (DF) is proposed and implemented using substrate integrated waveguide (SIW) technology which exhibits the advantages of compact size and simple structure. The proposed DF is realized by two half mode substrate integrated waveguides (HMSIWs) and two substrate integrated circular cavity (SICC) resonators operating in the TM degenerate modes in which an apert
A corrugated G-shaped grounded ring slot antenna for wideband circular polarization
Kapil Saraswat, Trivesh Kumar, A. R. Harish
Published online : 01-06-2020
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In this paper, a wideband circularly polarized corrugated G-shaped grounded ring slot antenna is presented. The proposed antenna structure is excited using a coplanar waveguide-fed monopole antenna, which is placed inside a corrugated G-shaped grounded ring. Due to the asymmetry in the ground plane, two orthogonal modes, having equal magnitude and out of phase by 90° are excited, resulting in circ
Rain fade slope model for terrestrial microwave links
Jalel Chebil, Md. Rafiqul Islam, Al-Hareth Zyoud, Mohamed Hadi Habaebi, Hassan Dao
Published online : 01-06-2020
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The dynamic characteristic of rain fade slope is one important factor in determining the availability of a communication system, and it is very useful in the design of fade countermeasures. In the literature, many models were proposed for rain fade slope for earth-to-satellite links. However, there are no models available for rain fade point to point terrestrial microwave links. This paper propose
Design of ultra-wide tetra band phased array inverted T-shaped patch antennas using DGS with beam-steering capabilities for 5G applications
Muhammad Anas, Hifsa Shahid, Abdul Rauf, Abdullah Shahid
Published online : 01-06-2020
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A novel 1 × 4 phased array elliptical inverted T-shaped slotted sectored patch antenna with defected ground structure (DGS), resonate at proposed ultra-wide tetra band at 28, 43, 51, and 64 GHz with high gain and beam-steering capabilities is presented. An inverted T-shaped slotted stub is used with the sectored patch to achieve ultra-wideband properties. In order to resonate the antenna at four d
Design and fabrication of a novel single-layer Ka-band reflectarray antenna
M. Abdollahvand, K. Forooraghi, Jose A. Encinar, Z. Atlasbaf, E. Martinez-de-Rioja
Published online : 01-06-2020
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A novel dual-polarization, single-layer reflectarray has been designed and manufactured to operate at receive (20 GHz) and transmit (30 GHz) frequencies for Ka-band terminal antennas. The reflectarray unit cell is composed of several types of resonant elements printed on the upper side of a conductor-backed substrate, which are designed to produce a collimated beam at 20 and 30 GHz in dual polariz
Dual-polarized, monostatic antenna array with improved ? isolation for 2.4 GHz in-band full duplex applications
Haq Nawaz, Ahmad Umar Niazi, M. Abdul Basit, Furqan Shaukat, Muhammad Usman
Published online : 01-06-2020
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This paper presents a two-elements based, dual polarized, single layer, patch antenna array with improved isolation between transmit () and receive () ports for 2.4 GHz in-band full duplex (IBFD) or simultaneous transmit and receive wireless applications. The differential feeding deployed at the port effectively suppresses the coupling which is termed as self-interference from the port to achiev
Development of gallium-arsenide-based GCPW calibration kits for on-wafer measurements in the W-band
Yibang Wang, Xingchang Fu, Aihua Wu, Chen Liu, Peng Luan, Faguo Liang, Wei Zhao, Xiaobang Shang
Published online : 01-06-2020
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We present details of on-wafer-level 16-term error model calibration kits used for the characterization of W-band circuits based on a grounded coplanar waveguide (GCPW). These circuits were fabricated on a thin gallium arsenide (GaAs) substrate, and via holes, were utilized to ensure single mode propagation (i.e., eliminating the parallel-plate mode or surface mode). To ensure the accuracy of the
Low-cost thin-film passive RFID circuits and detector system
Salma El-Sawy, Wasim Nawaz, Mohamed Osama, Ahmet Tekin
Published online : 01-06-2020
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This paper discusses the design of chip-less RFID tags of a standard pocket size of 69 mm by 156 mm. These tags are based on lumped elements of copper metal traces constructed on a thin polyamide flexible substrate. Moreover, a low-cost single-chip Bluetooth detector circuit system is demonstrated. Two different detection methods: variable coil load coupling and optical light intensity detection w
Compact bandpass filter with wide-stopband using substrate integrated waveguide cavities and short-circuited coplanar line
Amit Ranjan Azad, Akhilesh Mohan
Published online : 01-06-2020
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This article presented a compact bandpass filter with wide-stopband performance. Two substrate integrated waveguide (SIW) cavities and a short-circuited coplanar line introduced between the two cavities are used to realize a compact third-order bandpass filter. The passband is generated by combining the resonant frequency of TE mode of the SIW cavities and the fundamental resonant frequency of the
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