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1461 documents found for International Journal
Techniques for the generation of multiple additional transmission zeros in H-plane waveguide filters
Daniel Miek, Patrick Boe, Fynn Kamrath, Michael Höft
Published online : 01-10-2020
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In this paper, different techniques for the generation of additional transmission zeros (TZs) in planar waveguide filters are investigated. In the classical theory, TZs are generated only by destructive interference of non-adjacent cavities, limiting the available number of TZs to the filter order itself. However, more approaches for the generation of TZs are known, including bypass-coupling in ov
Analysis of high-order sub-harmonically injection-locked oscillators
Silvia Hernández, Mabel Pontón, Sergio Sancho, Almudena Suárez
Published online : 01-10-2020
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High-order sub-harmonically injection-locked oscillators have recently been proposed for low phase-noise frequency generation, with carrier-selection capabilities. Though excellent experimental behavior has been demonstrated, the analysis/simulation of these circuits is demanding, due to the high ratio between the oscillation frequency and the frequency of the input source. This work provides an a
Compact UWB BPF with a notched band using a single perturbed HMSIW cavity
Lili Qu, Yonghong Zhang, Qun Li, Yong Fan
Published online : 01-10-2020
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This paper presents a notched band ultra-wideband bandpass filter using a single perturbed quint-mode half-mode substrate-integrated waveguide cavity. The cavity is perturbed by loading four stubs at two corners of the magnetic walls of the single cavity. The variable parameters of stubs are selected to move down the first five resonant modes to the predetermined passband during the design process
Design of a compact high gain printed octagonal array of spiral-based fractal antennas for DBS application
Kalyan Sundar Kola, Anirban Chatterjee, Deven Patanvariya
Published online : 01-10-2020
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This paper presents a compact octagonal array of microstrip patch antennas for direct broadcast satellite (DBS) (12.2?12.7 GHz) services. The proposed single element of this array is a new fractal antenna, having considerably high gain and can heavily suppress cross polarization along the main beam direction. The single element is derived from a 2D spiral geometry. The corporate feed network of th
Mutual-coupling reduction in triple-band MIMO antennas for WLAN using CSRRs
Vahid Najafy, Mohammad Bemani
Published online : 01-10-2020
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For the requirements of low mutual-coupling MIMO antennas for WLAN, a new complementary split-ring resonator (CSRR) unit cell is introduced in this paper. A microstrip-fed Vivaldi antenna array is designed for WLAN applications, where compact triple-band gap-complementary split-ring resonator unit cells are loaded between two antennas to examine the effect of unit cells on the rate of mutual-coupl
SAR analysis of tri-band antennas for a 5G eyewear device
M. Dilruba Geyiko?lu, Hilal Koç Polat, Fatih Kaburcuk, Bülent Çavu?o?lu
Published online : 01-10-2020
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The goal of this study is to analyze the specific absorption rate (SAR) distribution of the projected 5G frequencies below 6 GHz and at Wi-Fi frequency (2.45 GHz) on a human head, for eyewear device applications. Two separate tri-band printed dipole antennas for this purpose are designed and fabricated at operating frequencies of 2.45/3.8/6 GHz for prototype-1 and at operating frequencies of 2.45/
Alternating direction method of multiplier for solving electromagnetic inverse scattering problems
Jian Liu, Huilin Zhou, Liangbing Chen, Tao Ouyang
Published online : 01-10-2020
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In this paper, a novel alternating direction method of multiplier (ADMM) is proposed to solve the inverse scattering problems. The proposed method is suitable for a wide range of applications with electromagnetic detection. In order to solve the internal ill-posed problem of the integral equation and make the reconstructed images more closer to the ground truth, first, the augmented Lagrangian met
Power-based pulsed radar detection using wavelet denoising and spectral threshold with pattern analysis
Ali Siblini, Kassim Audi, Alaa Ghaith
Published online : 01-10-2020
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In this paper, an algorithm for extracting and localizing a radar pulse in a noisy environment is described. The algorithm combines two powerful tools: wavelet denoising and the short-time Fourier transform (STFT) analysis with statistical-based threshold. We aim to detect radar pulses transmitted by any radar in blind mode regardless of the intra-pulse modulation and parametric features. The use
Effective parameters of a metamaterial composed of dielectric coated conducting cylindrical rods
Z. A. Awan, Hassan Ullah, Ahsan Ullah, Afshan Ashraf
Published online : 01-10-2020
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In the first part, the scattering characteristics of an isolated dielectric coated conducting rod have been investigated. The types of considered coatings for the scattering analysis are realistic materials including barium strontium titanate, magnetodielectric, gallium arsenide, and silicon carbide. It is found that the gallium arsenide coating can be used to significantly reduce the scattering f
Compact four-way suspended-stripline power divider with low loss and high isolation
Song Guo, Kaijun Song, Yong Fan
Published online : 01-10-2020
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A four-way suspended-stripline power divider is presented in this letter. The power dividing network is designed by using the suspended stripline, while the isolation network is designed by using the microstrip line. The vias are used to connect the power dividing network and the isolation network. The even- and odd-mode analysis method is applied to design the presented power divider. The simulat
Design of a hybrid A-sandwich radome using a strongly coupled frequency selective surface element
Krushna Kanth Varikuntla, Raghavan Singaravelu
Published online : 01-10-2020
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The airborne radomes have to cater superior electromagnetic (EM) performance with bandpass characteristics of stealth application. In this regard, a hybrid A-sandwich radome is proposed in this paper. The proposed radome consists of a novel strongly coupled frequency selective surface (FSS) core sandwiched between two dielectric layers (acts as skin) to form an A-sandwich structure. The dielectric
MRF volume 12 issue 7 Cover and Back matter
A. Ghiotto, A. Takacs, J.-C. Nallatamby, J. Portilla, J.-Y. Dauvignac, S. Méric
Published online : 01-09-2020
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MRF volume 12 issue 7 Cover and Front matter
A. Ghiotto, A. Takacs, J.-C. Nallatamby, J. Portilla, J.-Y. Dauvignac, S. Méric
Published online : 01-09-2020
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EuMW 2019 Special Issue
A. Ghiotto, A. Takacs, J.-C. Nallatamby, J. Portilla, J.-Y. Dauvignac, S. Méric
Published online : 01-09-2020
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Dual-band bandpass filter for software defined radio and 5G
Wei-Chung Chang, Wen-Hua Tu
Published online : 01-09-2020
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This paper presents the filter design in the student design competition of EuMW 2019. This contest motivates students for the design and implementation of a dual-band bandpass filter able to get outstanding performance, where different implementation technologies, such as microstrip, coplanar, multilayer microstrip, substrate integrated waveguide, and some others can be effectively employed. Filte
Effective resistivity extraction of low-loss silicon substrates at millimeter-wave frequencies
Lucas Nyssens, Martin Rack, Jean-Pierre Raskin
Published online : 01-09-2020
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The effective resistivity () is a figure of merit commonly used to assess the radio-frequency performance of a substrate from the measurements of coplanar waveguide lines. For highly resistive substrates, such as the trap-rich (TR) substrate, the extracted decreases by several orders of magnitude at millimeter-wave frequencies. The explanation for this decay is twofold. First, the imaginary part
Quasi-elliptic dual-band bandpass filters based on series-cascaded multi-resonant cells
Andrea Ashley, Dakotah J. Simpson, Dimitra Psychogiou
Published online : 01-09-2020
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This paper reports on quasi-elliptic dual-band bandpass filters (BPFs) that were designed for the Filter Student Design Competition of the 2019 European Microwave Week. The proposed lumped-element (LE) BPF concept is based on two dual-band transversal cells and one multi-resonant cell that allow the realization of symmetric and asymmetric dual-band transfer functions shaped by six poles and five t
Analysis of microwave backscattering from nonlinear sea surface with currents: doppler spectrum and SAR images
Xiang Su, Xiaoxiao Zhang, Hongxing Dang, Xiaomin Tan
Published online : 01-09-2020
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Electromagnetic scattering from the sea surface is of great significance in radar detection, target recognition, ocean remote sensing, etc. By introducing the action spectrum, the modified spatio-temporal variation wave spectrum is used to establish a nonlinear sea surface with currents in this paper. Traditional capillary wave modification facet scattering model (CWMFSM) can only calculate the ba
Microfluidic reflective-mode differential sensor based on open split ring resonators (OSRRs)
J. Muñoz-Enano, P. Vélez, M. Gil, F. Martín
Published online : 01-09-2020
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This paper proposes a differential sensor based on a pair of open split ring resonators (OSRR) operating in reflection. The output signal is thus the differential reflection coefficient of both resonators, intimately related to their dielectric loading. Thus, for identical loads in both sensing resonators, the individual reflection coefficients are equal, thereby providing an ideally null output s
A superheterodyne 300 GHz wireless link for ultra-fast terahertz communication systems
Iulia Dan, Guillaume Ducournau, Shintaro Hisatake, Pascal Szriftgiser, Ralf-Peter Braun, Ingmar Kallfass
Published online : 01-09-2020
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A superheterodyne transmission scheme is adopted and analyzed in a 300 GHz wireless point-to-point link. This was realized using two different intermediate frequency (IF) systems. The first uses fast digital synthesis which provides an IF signal centered around a carrier frequency of 10 GHz. The second involves the usage of commercially available mixers, which work as direct up- and down-converter
GaN digital microwave outphasing PA
Thomas Hoffmann, Andreas Wentzel, Thomas Flisgen, Florian Hühn, Wolfgang Heinrich
Published online : 01-09-2020
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This paper presents a novel GaN-based digital outphasing power amplifier (PA) for the 800 MHz range. The PA reaches a maximum output power of 5.8 W at 30 V final-stage (FS) drain supply voltage. A novel output combiner circuit is used and efficiency is improved by resonant commutation of the FSs and optimized driver circuits for the two GaN push-pull FSs. 3D electromagnetic simulation of output ne
Robust design of a broadband dual-polarized transition from PCB to circular dielectric waveguide for mm-wave applications
Andre Meyer, Martin Schneider
Published online : 01-09-2020
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A growing interest in dielectric waveguides (DWGs) as an alternative to commonly used waveguides (like coaxial or twisted-pair cables) for high data rate interconnects could be observed in the last few years. Especially in the mm-wave frequency range (30?300 GHz) applications with these waveguides benefit from low losses and low dispersion. Moreover, using both polarizations of the fundamental mod
300-GHz-band wireless communication using a low phase noise photonic source
L. Yi, K. Iwamoto, T. Yamamoto, F. Ayano, A. Rolland, N. Kuse, M. Fermann, Y. Li, T. Nagatsuma
Published online : 01-09-2020
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The implementation of advanced multi-level modulation schemes such as quadrature phase-shift keying (QPSK) in contrast to the conventional on?off keying is crucial to further boost the terahertz (THz) communications speed. Thereby, carrier phase noise reduction in the THz range is one of the key goals that need to be urgently achieved. In this paper, the photonic-based THz sources and the phase no
Optoelectronic generation of transient waveforms for UWB radars with rejected frequencies
Jeremy Hyvernaud, Gwenael Reineix, Romain Negrier, Joel Andrieu, Michele Lalande, Vincent Couderc
Published online : 01-09-2020
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In this paper, a new design of an optoelectronic system for transient waveforms shaping, with a selection of rejected frequencies, is presented. The generation of short pulses is performed with several optoelectronic generators using photoconductive semiconductor switches (PCSS) operating in linear switching mode and triggered via a laser pulse. With the appropriate number of generators, the syste
High-efficiency antenna-to-antenna polarization converters for customized polarization angle deflection
Manlan Deng
Published online : 01-09-2020
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In this paper, an antenna-to-antenna method to design high-efficiency polarization converters was proposed. Two in-linked split ring resonators (SRRs) were used as the fundamental unit cell, which can effectively make the original linear polarization angle deflected into a customized one (include but not limited to 90°). The same as the process of energy reception and transmitting of microstrip sy
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