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1993 documents found for International Journal
EuMW 2022 Special Issue
Alessandro Cidronali, Fabiola Colone, Rocco Giofrč, Marco Pasian, Debora Pastina
Published online : 01-06-2024
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On the effects of struts diameter and shape on the European Space Agency deep space antenna directivity and first side lobe
Davide Arenare, Fabio Pelorossi, Filippo Concaro, Marco Pasian
Published online : 01-06-2024
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Large reflector antennas, such as the European Space Agency deep space antennas (DSAs), practically always require struts to support the sub-reflector. While inevitable, they deteriorate the antenna performance. To minimize this deterioration, it is pivotal to understand the role played by different features, including struts diameter and shape. This paper proposes a detailed numerical investigati
Introduction of the orthogonal mode via the polarization conversion parasitic structure for the isolation enhancement of MIMO patch antennas
Zhonghong Du, Xiaohui Zhang, Peiyu Qin, Yurong Pu, Xiaoli Xi
Published online : 01-06-2024
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In this study, a high-isolation multiple-input multiple-output (MIMO) microstrip patch antenna (MPA), which utilizes an orthogonal mode cancellation method is proposed. This method employs TM and TM modes, which are simultaneously excited in the rectangular passive MPA. Initially, a rectangular decoupling structure featuring polarization rotation characteristics is designed. Further studies show t
Broadband packaging solution in embedded wafer level ball grid array technology for D-band PMCW radar
Elizabeth Bekker, Georg Gramlich, Luca Valenziano, Lucas Giroto de Oliveira, Theresa Antes, Thomas Zwick, Akanksha Bhutani
Published online : 01-06-2024
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A system-in-package for a wideband digital radar, in D-band, requires broadband, high-gain antennas combined with broadband chip-to-package and package-to-printed circuit board (PCB) interconnects. This paper demonstrates a wideband, low-loss quasi-coaxial signal transition, and a novel electric split ring resonator (eSRR)-based antenna-in-package (AiP) with a modified reflector concept, for impro
Combining 77?81 GHz MIMO FMCW radar with frequency-steered antennas: a case study for 3D target localization
Patrick Kwiatkowski, Alexander Orth, Nils Pohl
Published online : 01-06-2024
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In this paper, we introduce a compact 6 × 8 channel multiple-input multiple-output frequency-modulated continuous-wave radar system capable of determining the three-dimensional positions of targets despite utilizing a linear virtual array. The compact system, containing two cascaded radar transceiver ICs, has 48 virtual channels. We conduct a direction of arrival estimation with these virtual chan
A broadband circularly polarized antenna for millimeter-wave applications
Yue Xie, Jianping Zhao, Yurong Sun, Juan Xu
Published online : 01-06-2024
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This paper presents a broadband circularly polarized (CP) antenna array for millimeter-wave applications, and the antenna array has the advantages of wide impedance bandwidth (IBW), novel CP design, and low profile. The antenna unit consists of a two-layer substrate and two pairs of magnetoelectric dipoles. Stepped microstrip lines coupled by rectangular slits form a feeder network for easy integr
Low-cost solutions for mobile passive radar based on multichannel DPCA and NULA configurations
Andrea Quirini, Giovanni Paolo Blasone, Fabiola Colone, Pierfrancesco Lombardo
Published online : 01-06-2024
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In this paper, we investigate low-cost solutions for enabling ground moving target indication applications with multichannel mobile passive radar systems. As known, in order to be competitive with their active counterparts, passive radars are typically characterized by severe constraints in terms of cost, complexity, and compactness, especially when installed on moving platforms. On the one hand,
Optimal pattern synthesis of circular antenna arrays with improved effective aperture and beam area
Satish Kumar, Gopi Ram, Durbadal Mandal, Rajib Kar
Published online : 01-06-2024
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Circular antenna array (CAA) is one of the most widely used antenna array designs. This paper addresses the design challenges of the CAA with the non-uniform single ring, which is placed in an X-Y plane with the best sidelobe level (SLL) and improved first null beamwidth (FNBW). It has been solved using differential evolution, craziness-based particle swarm optimization (CRPSO), and novel particle
Thinned array distribution with grating lobe canceller at any scan angle for automotive radar applications
Masato Kohtani, Sungwoo Cha, Paul Schmalenberg, Jae Lee, Linjie Li, Toshihiko Takahata, Shinji Yamaura, Toshihiko Matsuoka, Gabriel M. Rebeiz
Published online : 01-06-2024
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A novel thinned antenna element distribution for cancelling grating lobes (GLs) as well as for reducing phase shifters (PSs) is presented for a two-dimensional phased-array automotive radar application. First, an efficient clustering technique of vertical adjacent elements is employed with array thinning for a PS reduction of 66.7%. In the proposed distribution, several single-element radiators (n
RT-SCNNs: real-time spiking convolutional neural networks for a novel hand gesture recognition using time-domain mm-wave radar data
Ahmed Shaaban, Maximilian Strobel, Wolfgang Furtner, Robert Weigel, Fabian Lurz
Published online : 01-06-2024
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This study introduces a novel approach to radar-based hand gesture recognition (HGR), addressing the challenges of energy efficiency and reliability by employing real-time gesture recognition at the frame level. Our solution bypasses the computationally expensive preprocessing steps, such as 2D fast Fourier transforms (FFTs), traditionally employed for range-Doppler information generation. Instead
Design of TE-polarized resonant Bessel-beam launchers for wireless power transfer links in the radiative near-field region
Edoardo Negri, Francesca Benassi, Walter Fuscaldo, Diego Masotti, Paolo Burghignoli, Alessandra Costanzo, Alessandro Galli
Published online : 01-06-2024
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Resonant Bessel-beam launchers (BBLs)are radiating devices constituted by a cylindrical metallic cavity with a partially reflecting sheet (PRS) on top. Millimeter-wave resonant BBLs typically exhibit transverse magnetic (TM) polarization due to the use of coaxial probes as feeders and homogenized metasurfaces as PRS. Launchers showing either a transverse electric (TE) or a (quasi-TE) polarizatio
Optimizing radiation patterns of mechanically reconfigurable phased arrays using flexible meta-gaps
D. Elliott Williamstyer, Ali Hajimiri
Published online : 01-06-2024
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In order to take on arbitrary geometries, shape-changing arrays must introduce gaps between their elements. To enhance performance, this unused area can be filled with meta-material inspired switched passive networks on flexible sheets in order to compensate for the effects of increased spacing. These flexible meta-gaps can easily fold and deploy when the array changes shape. This work investigate
Design and realization of a compact substrate integrated coaxial line butler matrix for beamforming applications
Satya Krishna Idury, Nicoló Delmonte, Lorenzo Silvestri, Maurizio Bozzi, Soumava Mukherjee
Published online : 01-06-2024
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This article presents the modeling and realization of a compact substrate integrated coaxial line (SICL) based butler matrix operating at 5 GHz for beam-forming applications. The proposed 4 × 4 butler matrix is developed using SICL-based hybrid coupler, crossover, and phase shifter. A compact 90 coupler comprising of center tapped unequal stubs is designed to enhance the size reduction as well as
Overcoming the relative bandwidth limitations of single VCO frequency synthesizers by implementing a novel PLL architecture
Tobias T. Braun, Jan Schoepfel, Aldo J. Marquez M., Nils Pohl
Published online : 01-06-2024
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Frequency-modulated continuous-wave radar systems profit from increasing the absolute bandwidths of the generated frequency chirps to improve range resolution. As the relative bandwidth of SiGe-voltage-controlled oscillators (VCOs) is limited to about 80%, increasing the center frequency fundamentally or via frequency multiplication is the most direct way to increase that absolute bandwidth. Howev
Quasioptical Fresnel-based lens antenna with frequency-steerable focal length for millimeter wave radars
Niklas Muckermann, Jan Barowski, Nils Pohl
Published online : 01-06-2024
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This article presents the design of a dielectric lens antenna that utilizes the concept of a stepped Fresnel lens for focusing electromagnetic millimeter waves. Based on the quasi-optical properties of these waves, a Cartesian Oval is optimized and employed as a focusing lens. Multiple such lenses are combined to two different Fresnel-based lens antennas. We survey these newly designed lens antenn
A compact and fully integrated FMCW radar transceiver combined with a dielectric lens
David Starke, Jonathan Bott, Florian Vogelsang, Benedikt Sievert, Jan Barowski, Christian Schulz, Holger Rücker, Andreas Rennings, Daniel Erni, Ilona Rolfes, Nils Pohl
Published online : 01-06-2024
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Electronic measurement systems in the THz frequency range are often bulky and expensive devices. While some compact single-chip systems operating in the high millimeter-wave frequency range have recently been published, compact measurement systems in the low THz frequency range are still rare. The emergence of new silicon-germanium (SiGe) semiconductor technologies allow the integration of system
Design of bandwidth-enhanced polarization controlled frequency selective surface based microwave absorber
Gaurav Chaitanya, Paritosh Peshwe, Saptarshi Ghosh, Ashwin Kothari
Published online : 01-06-2024
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A design of a microwave absorber based on frequency selective surface resonating in X-band having ultrathin thickness, polarization controlled behavior, and increased absorption bandwidth has been reported. The reported absorber having its unit cell embodied of multiple resonating structures which includes conventional square, circular, and butterfly shaped resonators resulting in three absorption
120 GHz microstrip power amplifier MMICs in a commercial GaAs process
Simon J. Mahon, MacCrae G. McCulloch, Jakov Mihaljevic, Melissa C. Gorman, Anthony E. Parker, Michael C. Heimlich
Published online : 01-06-2024
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Single-ended and balanced 90?120 GHz microstrip power amplifier MMICs have been designed for cost-sensitive 5G and 6G backhaul in a commercial 6-inch, 0.1-µm GaAs process. At 108 GHz, measured output power is 20.4 and 22.5 dBm, respectively. At 120 GHz, measured output is 12.6 and 17.4 dBm, respectively. This is the highest reported for GaAs, among the highest reported to date for microstrip MMIC
Ka-band stacked and pseudo-differential orthogonal load-modulated balanced power amplifier in 22 nm CMOS FDSOI
Jere Rusanen, Alok Sethi, Nuutti Tervo, Veeti Kiuru, Timo Rahkonen, Aarno Pärssinen, Janne P. Aikio
Published online : 01-06-2024
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This paper presents an integrated power amplifier (PA) following the orthogonal load-modulated balanced amplifier (OLMBA) topology. The fixed-phase prototype in this paper is implemented with 22 nm complementary metal oxide semiconductor (CMOS) fully depleted silicon-on-insulator (FDSOI) process. The proposed PA operates at 26 GHz frequency range, where it achieves 19.5 dBm output power, 16.6 dB g
IJMWT special issue on the 21st Mediterranean Microwave Symposium (MMS2022)
Luigi Boccia, Emilio Arnieri, Luca Catarinucci
Published online : 01-02-2024
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Legendre quadrature for the discretization of 1D radiating panels
Amedeo Capozzoli, Claudio Curcio, Francesco D?Agostino, Angelo Liseno, Luigi Pascarella
Published online : 01-02-2024
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In [A. Capozzoli, C. Curcio, A. Liseno, MMS, Pizzo Calabro, Italy, 2022], the problem of modeling a source/scatterer using an equivalent radiator has been addressed and an approach has been given and numerically assessed.
Multilayer circular substrate-integrated waveguide cavity band-pass filters with ultrawide stopband characteristics
Amrita Medda, Amit Ranjan Azad, Akhilesh Mohan, Manoranjan Sinha
Published online : 01-02-2024
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This paper presents a methodology to design band-pass filters having ultrawide stopband characteristics using multilayer circular substrate-integrated waveguide (SIW) cavities. The orthogonal microstrip feedlines are used as input and output ports that are present at the top and bottom layers, while the middle layers are used to couple the SIW cavities. Higher-order spurious modes of the circular
A planar BPF for UWB communication systems with single/multiple interference rejection bands
Abu Nasar Ghazali, Mohd Sazid
Published online : 01-02-2024
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The design and development of a microstrip-based planar ultra-wideband (UWB) bandpass filter (BPF) with single/multiple interference rejection capability is presented. The proposed BPF structure is developed based on the broadside coupled mechanism of microstrip/coplanar waveguide (CPW). The BPF has microstrips and short-circuited CPW capacitively coupled through the substrate. The basic frequency
Efficient rectifier circuit operating at N78 and N79 sub-6 GHz 5G bands for microwave energy-harvesting and power transfer applications
Md. Ahsan Halimi, Taimoor Khan, Ahmed A. Kishk, Yahia M.M. Antar
Published online : 01-02-2024
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The microwave energy-harvesting (MEH) and microwave power transfer (MPT) technologies have become the most emerging areas of research nowadays. The microwave rectifier circuit is the bottleneck of both the MEH and MPT systems. The efficiency of the system depends on the power conversion efficiency (PCE) of the rectifier. Due to the recent advancement of the fifth-generation communication system, i
Compact three-way planar power divider with a simple structure
Stelios P. Tsitsos, Ioannis C. Giannenas
Published online : 01-02-2024
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A simple and compact three-way planar power divider, which avoids the floating common node of the isolation resistors, is presented. The proposed structure exhibits a wideband operation (measured frequency range of 1.6?3.3 GHz and bandwidth of 69.4%) with good return loss and isolation characteristics. Transmission line theory is used for the mathematical analysis and extraction of design equation
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