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1953 documents found for International Journal
A low-profile two-arm backfire tapered cone helical antenna for TT&C in microsatellites
Zhanyu Kang, Lianxing He, Dongliang Fei, Mingkang Li, Guang Liang
Published online : 01-09-2023
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A novel low-profile two-arm backfire tapered cone helical antenna for telemetry tracking and command (TT&C) is introduced theoretically and experimentally in this paper. Compared with the conventional helical antenna, this design has a substantial decrease in its height and an increase both in its half power beamwidth (HPBW) and 3-dB axial ratio beamwidth by replacing the uniform structure with tw
3D-printed wideband Vivaldi antenna for millimeter wave applications
Zunnurain Ahmad, Lee Harle
Published online : 01-09-2023
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Main aim behind this study is to utilize 3D printing technique for designing and fabrication of a flexible wideband Vivaldi antenna for the upcoming 5 G systems. Frequency bands starting from 24 up to 65 GHz are receiving particular attention as they have potential for both high data rate communications and high-resolution radar applications. A Vivaldi antenna is used for its very wideband propert
Reference signal extraction based on multiprocessing method in dual-polarization antenna passive radar
Yucheng Yi, Lu Zhu, Long Liang, Yan Fu
Published online : 01-09-2023
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Extraction of reference signal is an indispensable step in the signal processing of polarization diversity passive radar (PDPR) based on a digital television signal. A conventional reference signal extraction method requires an additional reference antenna, which has a certain demand for space. Single dual-polarization antenna passive radar (SDPPR) systems do not require a reference antenna, and t
A compact dual-band dual-linearly polarized waveguide slot array antenna with groove at waveguide bottom
Jun Gao, Tianpeng Li, Hai Wang, Xue Lei, Kexin Wang
Published online : 01-09-2023
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A dual-band dual-linearly polarized waveguide slot array antenna is proposed in this paper. Two orthogonal slots share a short-circuit wall on broad side. The horizontal and vertical slots, which actualize dual-frequency bands and dual-linear polarization, generate vertically polarized electric fields in 9.39?9.78 GHz and horizontally polarized electric fields in 11.62?12.3 GHz, respectively. The
Trapezoidal pulse-switching strategy for failure correction of multi-pattern time-modulated linear array
Ananya Mukherjee, Sujoy Mandal, Sujit K. Mandal, Rowdra Ghatak
Published online : 01-09-2023
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In this paper, a novel approach for simultaneously correcting multiple degraded patterns under the failure condition of time-modulated linear arrays is proposed. The approach is based on the use of trapezoidal pulse with non-zero rise/fall time to control the switching status of the radio frequency switches that enables ON-OFF keying modulation of the array elements. After deriving a closed form e
Broadband frequency reconfigurable printed transceivers for microwave imaging systems
Ankita Malhotra, Ananjan Basu
Published online : 01-09-2023
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In this paper, we propose a novel method for obtaining wideband spectral information of the target in microwave imaging systems by using broadband frequency reconfigurable printed transceivers. The proposed transceiver is composed of two embedded stacked microstrip antenna configurations operating in C-band (5.5?8.5 GHz) and X-band (8.5?11.5 GHz) with each having 3 GHz bandwidth. The transceiver s
Selectivity improvement of interdigital filtering-antenna using different orders for 5 G application
Dwi Astuti Cahyasiwi, Emilia Roza, Mohammad Mujirudin, Nusriyati Mahmuda Nashuha, Fitri Yuli Zulkifli, Eko Tjipto Rahardjo
Published online : 01-09-2023
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In this paper, filter and antenna integration is studied to produce a compact device for wireless front-end equipment. Filtering antennas are advanced due to their selectivity performance, represented by a flat gain response. Two filtering antennas are proposed to improve the selectivity using different orders. The first antenna is based on second-order filter and the other on third-order filter.
A robust and efficient wall parameter estimation approach for through wall radar
Akhilendra Pratap Singh
Published online : 01-09-2023
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In through-wall radar system, the wall parameters, including permittivity, and wall thickness are of crucial importance for locating targets precisely. Recently, to obtain a quick and accurate estimation of wall parameters, an approach based on machine learning was introduced. However, these approaches are less reliable as only simulations results are presented. One of the major concerns with mach
Exploration of adulteration in common raw spices using antenna-based sensor
Nitika, Jaswinder Kaur, Rajesh Khanna
Published online : 01-09-2023
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The ability of food products to store and dissipate electromagnetic energy is determined by the material's dielectric properties. In relation to this phenomenon, a non-destructive technique is presented for food evaluation based on the shift in resonant frequency and reflection coefficient magnitude value of the proposed slot-loaded microstrip line-fed antenna-based sensor caused by the change in
Design of a flower shaped compact printed antenna for ultra-wideband communication
Manohar Golait, Mahendra Gaikwad, Balasaheb H. Patil, Manish Varun Yadav, Sudeep Baudha, Lokesh Kumar Bramhane
Published online : 01-09-2023
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In this communication, a compact flower shaped printed antenna for ultra-wideband communication is proposed. The ?flower-shaped? structure is capable of transmitting UWB-band signals. The designed antenna exhibits a return loss ranging from 2.3 to 11 GHz with an 8.7 GHz central frequency and has 130% relative bandwidth. The suggested design includes a patch in the shape of a flower with several sl
EuMW 2021 Special Issue
Yi Wang, Edward Wasige, Matthew Ritchie
Published online : 01-07-2023
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MRF volume 15 issue 6 Cover and Front matter
Yi Wang, Edward Wasige, Matthew Ritchie
Published online : 01-07-2023
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MRF volume 15 issue 6 Cover and Back matter
Yi Wang, Edward Wasige, Matthew Ritchie
Published online : 01-07-2023
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Frequency comb MIMO OFDM radar demonstrator with high unambiguous velocity
Benjamin Nuss, Lucas Giroto de Oliveira, Thomas Zwick
Published online : 01-07-2023
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Digital radar waveforms such as orthogonal frequency-division multiplexing (OFDM) often have the disadvantage that they require high sampling rates if fine range resolutions have to be achieved. The frequency comb OFDM radar scheme offers a possibility to overcome this drawback and to improve the range resolution without increasing the sampling rate. Simultaneously, the high unambiguous velocity,
Compact hand-guided 3D scanning terahertz sensor platforms with 3D-printed aspherical telecentric f-? lens
Shiva Mohammadzadeh, Raphael Hussung, Andreas Keil, Sven Leuchs, Christian Krebs, Dirk Nüßler, Jörg Seewig, Georg von Freymann, Fabian Friederich
Published online : 01-07-2023
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We report on the development of a handheld three-dimensional (3D) terahertz scanning system with an aspherical telecentric 3D-printed f-? lens using selective laser sintering. The lens covers a broader scan line of 50 mm with its larger aperture, compared to the 20 mm range in our initial work, which was presented at the European Microwave Week 2021. In order to evaluate the adaptability of the op
System architecture for a compact high range resolution frequency comb OFDM radar
Alexander Quint, Benjamin Nuss, Axel Diewald, Thomas Zwick
Published online : 01-07-2023
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With increasing demands on resolution and flexibility in current and future radar applications, the focus is moving to digital radar systems such as orthogonal frequency-division multiplexing (OFDM) radars. To achieve high bandwidths and consequently a high range resolution, high sampling rates are needed. To overcome this constraint, an approach called frequency comb OFDM radar has been developed
Plasma state supervision utilizing millimeter wave radar systems
Francesca Schenkel, Christoph Baer, Ilona Rolfes, Christian Schulz
Published online : 01-07-2023
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This work introduces a method for plasma state supervision, based on a frequency-modulated continuous wave radar sensor and a suitable signal evaluation enabling a continuous supervision method for the plasma state. Highly precise phase evaluation of the signal allows us to detect and visualize smallest changes in the plasma state. Assuming the plasma to act like a frequency-dependent dielectric m
RF linearity trade-offs for varying T-gate geometries of GaN HEMTs on Si
Rana ElKashlan, Ahmad Khaled, Raul Rodriguez, Arturo Sibaja-Hernandez, Uthayasankaran Peralagu, AliReza Alian, Nadine Collaert, Piet Wambacq, Bertrand Parvais
Published online : 01-07-2023
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Short-channel Gallium Nitride (GaN) high-electron-mobility transistors (HEMTs) often utilize T-shape gates due to their large gate-line cross-sectional area and subsequent increase. In this paper, we report the linearity trade-offs associated with varying the T-gate geometries of AlGaN/GaN HEMTs on Si, specifically the gate extensions which serve as field plates and their impact on the large-sign
RCS prediction and optimization for anomalous reflection metasurfaces using Floquet analysis
Matthieu Elineau, Renaud Loison, Stéphane Méric, Raphaël Gillard, Pascal Pagani, Geneviève Mazé-Merceur, Philippe Pouliguen
Published online : 01-07-2023
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Due to their periodic nature, metasurfaces used to perform anomalous reflection raise parasitic harmonic reflections. We show a classical synthesis example of such a structure and highlight its limitations. Floquet analysis and its associated simulation environment are exploited to understand the origin of these parasitic reflections and to mitigate them. The proposed method is based on the optimi
A phase-locked loop with a jitter of 50 fs for astronomy applications
Tobias T. Braun, Marcel van Delden, Christian Bredendiek, Jan Schoepfel, Stephan Hauptmeier, William Shillue, Thomas Musch, Nils Pohl
Published online : 01-07-2023
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Radio telescopes are among the applications with the highest demands on a local oscillator (LO), which is used to receive and process the signals coming from the sky. Therefore the modules providing the required LO signal have traditionally been big and complicated. To overcome this disadvantage, we implement our own integrated frequency synthesizer inside a small LO module in this article. With t
Metamaterial lenses for monostatic and bistatic 77 GHz radar systems
Christoph Kohlberger, Richard Hüttner, Christoph Wagner, Andreas Stelzer
Published online : 01-07-2023
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Metamaterial lenses are appealing thin alternatives to conventional dielectric lenses. In this contribution we describe their design and application in two exemplary 77 GHz automotive radar sensors operating in monostatic and bistatic modes. The frontends are built around commercially available MMICs and small feed antennas are used in coordination with the six-layer printed circuit board-based re
Circuits for 5G RF front-end modules
Florinel Balteanu
Published online : 01-07-2023
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Worldwide adoption of fourth-generation wireless (4G) long-term evolution (LTE) smartphones and the actual transition to fifth-generation wireless(5G) is the main driving engine for semiconductor industry. 5G is expected to reach high data rate speeds (1 Gbps) and low latency (<1 ms). 5G requires more RF bandwidth and therefore an increase in the number of components such as RF switches, acoustic
Terahertz non-destructive testing of power generator bars with a dielectric waveguide antenna
Maris Bauer, Raphael Hussung, Carsten Matheis, Andrey Mashkin, Stefan Krane, Friedhelm Pohlmann, Fabian Friederich
Published online : 01-07-2023
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Terahertz technologies for non-destructive testing (NDT) are continuing to find their way into the industrial sector in the context of very specific inspection tasks. Part of this development is the capability to adapt terahertz systems in such a way that they can meet the sometimes harsh challenges and requirements of real-world industrial scenarios. One such scenario is the inspection of compone
Miniaturization of folded circular SIW cavity filters
Anton Sieganschin, Bartosz Tegowski, Alexander Koelpin, Arne F. Jacob
Published online : 01-07-2023
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This contribution presents miniaturization techniques for folded circular substrate integrated waveguide (FCSIW) cavity filters. The cavities support dual-mode operation. Two of these cavities are combined to form a fourth-order filter. Two filter designs are implemented. The first one serves as a reference and exhibits good manufacturability. For the second one, the cavity is modified, which lead
28 GHz over-the-air measurement using an OTFS multi-user distributed MIMO under Doppler effect
Noriaki Tawa, Toshihide Kuwabara, Yasushi Maruta, Tomoya Kaneko
Published online : 01-07-2023
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This paper describes the experimental investigation of orthogonal time-frequency space (OTFS) modulation using a 28 GHz multi-user distributed multiple-input multiple-output (D-MIMO) testbed in over-the-air (OTA) and mobility environments to enhance cell throughput in a millimeter-wave band. We build the D-MIMO testbed having newly developed OTFS modulator and demodulator, and measured OTFS signal
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