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1275 documents found for International Journal
MRF volume 11 issue 8 Cover and Back matter
Published online : 01-10-2019
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MRF volume 11 issue 8 Cover and Front matter
Published online : 01-10-2019
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Compact filtering power dividers with wide upper stopband
Gaoya Dong, Weimin Wang, Yuanan Liu
Published online : 01-10-2019
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A series of compact filtering power dividers (FPDs) with simple layouts are proposed based on coupling topology. The structure of the presented FPD1 is composed of three resonators and one isolating resistor. These FPDs can be designed based on coupling matrix filter theory. A half-wave transmission line is employed in FPD2 to introduce a transmission zero (TZ) locating at 1.27. The FPD3 is design
Gain enhancement for MIMO antenna using metamaterial structure
Ngoc Lan Nguyen, Van Yem Vu
Published online : 01-10-2019
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In this paper, a multiple input multiple output antenna which operates at 5.8 GHz for wireless local area network applications is proposed. The proposed antenna is composed of two sets of four elements antenna array (2 × 2) on the top and a novel metamaterial structure on the ground plane. Here, the ground plane, which includes a lattice of 2 × 5 unit cells of metamaterial structure, is utilized i
A low insertion loss low-pass filter based on single comb-shaped spoof surface plasmon polaritons
Luping Li, Lijuan Dong, Peng Chen, Kai Yang
Published online : 01-10-2019
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This paper presents a low insertion loss low-pass filter based on the spoof surface plasmon polariton (SSPP) with single comb-shape. Compared with traditional ones, the proposed filter provides lower insertion loss and return loss by optimizing the structural parameters of the mode conversion and SSPP parts. According to the measurement results, the average insertion loss of the fabricated filter
Design of WLAN/WiMAX band notch super-wideband microstrip fractal antennas
S. S. Abdpour, N. Azadi-Tinat, H. Oraizi, J. Ghalibafan
Published online : 01-10-2019
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A super-wideband microstrip fractal antenna is designed with miniaturized dimensions of 21 mm × 23.5 mm × 1 mm and generation of dual rejection bands for WLAN/WiMAX systems has been achieved. The triangular fractal shape slots are placed inside a circular patch and the antenna is miniaturized by using a repetition frequency resonance technique. The proposed antenna frequency range 2.6?40 GHz opera
A multilayer substrate integrated filter using dual dielectric modes
Xiao-Xiao Yuan, Li-Heng Zhou, Jian-Xin Chen
Published online : 01-10-2019
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In this paper, a novel multilayer substrate integrated dual-mode dielectric resonator (DR) filter is proposed. The square dual-mode DR is made of the high permittivity substrate by removing the undesired portions and the surface coppers so that the relatively high unloaded quality factor of the dominate TM pair can be obtained which compared to these fully dielectric-filled substrate integrated wa
Design and performance analysis of a conformal CPW fed wideband antenna with Mu-Negative metamaterial for wearable applications
Deepa Negi, Rajesh Khanna, Jaswinder Kaur
Published online : 01-10-2019
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In this paper, a flexible CPW fed ultrawide band (UWB) antenna with mu-negative (MNG) metamaterial is designed, fabricated, and tested for wearable applications. Initially, a UWB antenna of size 50 mm × 43 mm is fabricated on two different substrates, viz. flexible FR4 and semi-flexible Rogers RT/duroid 5880. A metamaterial structure fabricated on flexible FR4 shows a magnetic resonance from 7.2 G
A tunable open ring coupling structure and its application in fully tunable bandpass filter
Zhonghai Zhang, Fei Zhao, Aiting Wu
Published online : 01-10-2019
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This letter presents a novel tunable coupling structure to simplify the design complexity of the miniaturized fully tunable filter by using open ring and varactors. Based on the proposed novel tunable coupling structure, a fully tunable bandpass filter is implemented with independently tunable operating frequency and bandwidth. The tunable resonator and tunable coupling structure can be easily com
Broadband CPW-fed circularly polarized antenna for IoT-based navigation system
Amit Birwal, Sanjeev Singh, Binod Kumar Kanaujia, Sachin Kumar
Published online : 01-10-2019
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The paper presents a new coplanar waveguide (CPW)-fed rectangular patch antenna with a square-shaped ground plane that can be employed in modern advanced navigation systems. For realizing broad impedance bandwidth in the proposed antenna, a wide slot is introduced in the square ground plane and the rectangular patch is shifted toward the left edge of the ground surface. In addition, by means of in
Coherent J-Band radiating arrays based on ×27 CMOS activemultiplier chips
Roman Klimovich, Samuel Jameson, Eran Socher
Published online : 01-10-2019
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This paper presents a hybrid design of 1 × 2 and 1 × 4 arrays operating in 0.277?0.292 THz on 65 nm Complementary metal?oxide?semiconductor (CMOS) technology. Each of the chips has an X-band input with 3 ×3 multiplier stages and connected at the output to an on-chip ring antenna. A wideband microstrip Wilkinson four-way and two-way power dividers have been developed on a multilayer printed circuit
Single layer miniaturized ultra-thin FSS with five closely spaced bands
Anupam Dey, Rajarshi Sanyal
Published online : 01-10-2019
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This Paper reveals a novel single layer five band frequency selective surface (FSS). Novelties of the proposed FSS lie in its five closely spaced stop bands at 2.4, 3.38, 4.82, 6.32, and 7.75 GHz as well as the reduced single layer structural thickness (0.0016 ) and the miniaturized unit cell size (0.0656 ) at lower resonant frequency as compared to the existing multiband FSS. The unit cell struct
Multi-band rejection filters based on spoof surface plasmon polaritons and folded split-ring resonators
Luping Li, Lijuan Dong, Peng Chen, Kai Yang
Published online : 01-10-2019
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A dualband rejection filter and a triband rejection filter are proposed in this letter, both of which are implemented by cascading spoof surface plasmon polaritons (SSPPs) of the same structure but with diverse rejection bands. Compared with traditional ones, the proposed filters provide more compact structures, wider rejection bands, and better independent tunability. In the proposed filters, the
High-gain cavity backed patch antenna arrays at 140 GHz based on LTCC technology
Zihang Qi, Xiuping Li, Jinjin Chu, Jun Xiao, Hua Zhu
Published online : 01-10-2019
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In this paper, high-gain cavity backed patch antenna arrays are proposed based on low temperature co-fired ceramic technology at 140 GHz. By introducing a substrate integrated cavity to the patch antenna element, the gain is enhanced by 3.3 dB. Moreover, a rectangular ring is loaded around the patch for better impedance matching and further gain enhancement. The final simulated maximum gain of the
SIW resonator fed horn mounted compact DRA with enhanced gain for multiband applications
Pramod Kumar, Jitendra Kumar, Shailendra Singh, Utkarsh, Santanu Dwari
Published online : 01-10-2019
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A novel design of compact and light-weight horn mounted cylindrical dielectric resonator antenna (CDRA) fed by substrate integrated waveguide (SIW) resonator has been investigated for high gain and multiband applications. SIW resonator contains two closely spaced longitudinal slots of equal length and unequal width to excite the CDRA. These slots are responsible for introducing triple resonating b
Wideband out-of-phase power dividers with improved isolation performance
Kaijun Song, Fei Xia, Yuxuan Chen, Yu Zhu, Jiawei Li, Yong Fan
Published online : 01-10-2019
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A compact wideband out-of-phase power divider (PD) with improved isolation performance is proposed. This divider is formed by connecting an additional stub for isolation to output ports of a traditional Marchand balun with a defected ground structure (DGS) been used. To verify the design, a prototype divider is fabricated and tested. The measured results validate the 53.86% band-width centered at
A new method for path-loss modeling
Qiang Li, Hongxin Zhang, Yang Lu, Tianyi Zheng, Yinghua Lv
Published online : 01-10-2019
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In this paper, a new path-loss model for electromagnetic wave in an indoor multipath environment is proposed based on matching coefficient, polarization matching factor, and normalized field intensity direction function. This model is called the Friis-extension (Friis-EXT) model, because it operates as the Friis model under certain conditions. In addition, in the modeling process of the path-loss
Compact bandpass-filtering response power divider with high-frequency selectivity and high isolation
Jiawei Li, Kaijun Song, Fei Xia, Shema Richard Patience, Song Guo, Maoyu Fan
Published online : 01-10-2019
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A compact high-isolation power divider with bandpass response and high-frequency selectivity is presented in this letter. Two dual-mode resonators are used to realize filtering response. The circuit size of the proposed power divider can be reduced by using dual-mode capacitance loaded square meander loop resonators. Due to capacitive load, the resonator can exhibit slow-wave characteristics, whic
Recent challenges and advances in microwave and radar techniques ? MIKON 2018 special issue
Konrad Jedrzejewski, Frank Weinmann
Published online : 01-09-2019
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MRF volume 11 issue 7 Cover and Back matter
Krzysztof Kulpa, Frank Weinmann, Vicente E. Boria, Teresa Martín, Mateo Burgos
Published online : 01-09-2019
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MRF volume 11 issue 7 Cover and Front matter
Krzysztof Kulpa, Frank Weinmann, Vicente E. Boria, Teresa Martín, Mateo Burgos
Published online : 01-09-2019
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Modifications of active phased antenna arrays near-field diagnosis method based on compressive sensing
Grigory Kuznetsov, Vladimir Temchenko, Maxim Miloserdov, Dmitry Voskresenskiy
Published online : 01-09-2019
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This paper presents two modifications of compressive sensing (CS)-based approach applied to the near-field diagnosis of active phased arrays. CS-based antenna array diagnosis allows a significant reduction of measurement time, which is crucial for the characterization of electrically large active antenna arrays, e.g. used in synthetic aperture radar. However, practical implementation of this metho
Evaluation of a robust correlation-based true-speed-over-ground measurement system employing a FMCW radar
Torsten Reissland, Bjoern Lenhart, Johann Lichtblau, Michael Sporer, Robert Weigel, Alexander Koelpin
Published online : 01-09-2019
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This paper presents a novel approach for the determination of True-Speed-Over-Ground for trains. Speed determination is accomplished by correlating the received signals of two side-looking radar sensors. The theoretically achievable precision is derived. Test measurements are done in two different scenarios to give a proof of concept. Thereafter a series of field measurements is performed to rate
A SiGe transceiver chipset for automotive radar applications using wideband modulation sequences
Jan Schoepfel, Simon Kueppers, Klaus Aufinger, Nils Pohl
Published online : 01-09-2019
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This paper presents a W-band MIMO radar transceiver chipset for automotive applications, based on a Silicon Germanium technology. It consists of a reference VCO, operating at a center frequency of 38 GHz and a companion IC that comprises a complete millimeter-wave transceiver at 76 GHz. This chipset enables building multipurpose MIMO radar systems that can be scaled in terms of transmitter and rec
Toward 3D passive radar exploiting DVB-T2 transmitters of opportunity
Aleksey Barkhatov, Evgenii Vorobev, Vladimir Veremyev, Vladimir Kutuzov
Published online : 01-09-2019
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This article presents the configuration and technical specification of the passive radar exploiting third-party transmitters of second-generation digital video broadcasting standard DVB-T2 as illuminators of opportunity. The performance of the two-dimensional (2D) passive radar estimated based on theoretical and experimental study is described. The possible configuration of the 2D non-equidistant
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