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1316 documents found for International Journal
MRF volume 12 issue 1 Cover and Back matter
Published online : 01-02-2020
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MRF volume 12 issue 1 Cover and Front matter
Published online : 01-02-2020
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Realization of transmission zeros for bandpass filter using inductive-coupled stub-loaded resonators
Fei Cheng, Ping Lu, Kama Huang
Published online : 01-02-2020
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This article proposes a bandpass filter with three controllable transmission zeros (TZs) using three inductive-coupled stub-loaded resonators (SLRs). Different from other works, the proposed SLR can create one transmission pole and one TZ. With the TZs above the passband, high stopband rejection level is achieved. Moreover, the -inverters are realized by short-circuit stubs between two adjacent SL
A novel compact lowpass filter with sharp roll-off and wide stopband
M. Hayati, AS. Abdipour, AR. Abdipour
Published online : 01-02-2020
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In this paper, a microstrip lowpass filter adopting two main resonators with steep transition band and wide rejection band has been introduced. The first main resonance cell consists of meandered transmission lines which are loaded by modified T-shaped patches. The second main resonator is composed of high-impedance lines loaded by polygon patches. To obtain a steep skirt performance, the first an
Measurement method for characterizing a millimeter-wave traveling-wave power combiner using test accessories
Honglei Sun, Xiao-Wei Zhu, Xuesong Shi, Ruijia Liu
Published online : 01-02-2020
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This paper presents a novel assessment method that minimizes test-fixture-induced errors in non-coaxial power combiner measurement by extending the port reduction method. This method involves terminating certain ports to acquire the scattering matrix of an -port network from the scattering matrix measured at a reduced port order. The entire DUT scattering matrix is obtained from multiple scanning
Experimental validation of an isoflux Earth coverage with a bimode ARMA antenna on a nanosatellite
E. Arnaud, A. Siblini, A. Bellion, B. Jecko
Published online : 01-02-2020
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Spatial telemetry links on nanosatellites require more and more reconfigurable beam antennas to improve the Earth coverage. The bi-mode Agile Radiating Matrix Antenna (8.0?8.4 GHz) was successfully designed to solve such kind of problems by using an isoflux mode associated with a switchable directive one. However, such an antenna introduces some manufacturing problems , mainly due to the small ava
Dual-function radar?communications: information transmission during FDA radar listening mode
Abdul Rahman Al-Salehi, Ijaz Mansoor Qureshi, Aqdas Naveed Malik, Wasim Khan, Abdul Basit
Published online : 01-02-2020
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We investigate the frequency diverse array (FDA) for joint radar and communication systems. The basic idea is to use the transmitter/receiver modules of the radar system for communication purpose during listening mode as a secondary function. The radar will be performing its routine functions during the active mode as a primary function. An FDA at the transmitter side will be used to produce an or
Fully reconfigurable hexagonal-shaped comb-line filterplatform for prototyping and education purposes
Daniel Miek, Michael Höft
Published online : 01-02-2020
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In this paper, a completely reconfigurable comb-line bandpass filter is presented. Due to the modularity, different standard coupling matrix topologies like the folded form, cascaded triplets, and the cul-de-sac form can be implemented and tested. Circuit-based coupling matrices like the extracted pole topology can easily be realized as well. Different types of input-/output- and cross-couplings c
Surface impedance properties of a wire grid embedded in a chiral medium
Z. A. Awan
Published online : 01-02-2020
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The surface impedance characteristics of a wire grid composed of infinitely long parallel conducting wires embedded in lossless and lossy frequency-dispersive chiral background media have been investigated. Using wavefield decomposition approach for a chiral background and with the application of impedance boundary conditions for a wire grid, an analytic expression for the surface impedance of a w
A miniaturized CPW-fed on-chip UWB monopole antenna with band-notch characteristics
S. Mandal, A. Karmakar, H. Singh, S. K. Mandal, R. Mahapatra, A. K. Mal
Published online : 01-02-2020
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This paper presents the design and analysis of a miniaturized, coplanar waveguide-fed ultra-wideband monopole on-chip antenna with band-notch characteristics. By incorporating a ?U?-shaped slot in the feedline, a band-notch is realized in the frequency range of 7.9?8.4 GHz to avoid interference from the X-band uplink satellite communication system. The proposed antenna achieved good voltage standi
Effects of vibration on passive intermodulation of microwave connector
Tuanjie Li, Mingtai Li, Wangmin Zhai, Jie Jiang
Published online : 01-02-2020
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This paper investigates the generation of passive intermodulation (PIM) in coaxial connectors during vibration. A series of experiments were designed and the simulation model and method were proposed for understanding these phenomena. We found that PIM is mainly influenced by the contact stress and contact surface roughness during vibration. Thus, a power spectral density method is presented to id
Localization of unknown electromagnetic source using 3D-antenna arrays
Sreenivasulu Pala, Srividhya Palliyani, Mohamed Himdi, Olivier Lafond, Dhanesh G. Kurup
Published online : 01-02-2020
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In this article, we propose three-dimensional antenna systems for determining the position of electromagnetic radiation source at an unknown location. Received signal power at different antennas and position of radiation source are used as training data for Artificial Neural Network (ANN). It is found that, a well-trained ANN is computationally efficient and capable of predicting the unknown locat
A compact four-port UWB MIMO antenna with connected ground and wide axial ratio bandwidth
Sachin Kumar, Gwan Hui Lee, Dong Hwi Kim, Wahab Mohyuddin, Hyun Chul Choi, Kang Wook Kim
Published online : 01-02-2020
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A new design method of an ultra-wideband circularly-polarized planar multiple-input-multiple-output (MIMO) antenna is presented in this paper. The proposed MIMO antenna consists of four unit cell antennas, being comprised of a microstrip feed line and a square slotted ground plane. In the proposed unit cell design, a circular stub is protruded from the ground plane strip for achieving circular pol
MRF volume 11 issue 10 Cover and Back matter
Published online : 01-12-2019
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MRF volume 11 issue 10 Cover and Front matter
Published online : 01-12-2019
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Behavioral modeling and digital pre-distortion techniques for RF PAs in a 3 × 3 MIMO system
Mahmoud Alizadeh, Peter Händel, Daniel Rönnow
Published online : 01-12-2019
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Modern telecommunications are moving towards (massive) multi-input multi-output (MIMO) systems in 5th generation (5G) technology, increasing the dimensionality of the systems dramatically. In this paper, the impairments of radio frequency (RF) power amplifiers (PAs) in a 3 × 3 MIMO system are compensated in both the time and the frequency domains. A three-dimensional (3D) time-domain memory polyno
Single transistor low phase noise active dielectric resonator oscillator
Zahra Soltani, Shahrooz Asadi, Esfandiar Mehrshahi
Published online : 01-12-2019
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In this paper, the design theory of an 8 GHz oscillator with a new structure of active dielectric resonator (DR) is presented. The new structure emphasizes on phase noise reduction by using only one active device. The proposed structure uses additional feedback from transistor to resonator in order to increase the quality factor. Measurement results report that phase noise is reduced to ?145.19 dB
A bottom-feed omni-directional circularly polarized antenna array
Xi Li, Lin Yang, Jia-Wei Zhao, Yi Liu, Fang-Zhou Sun
Published online : 01-12-2019
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A bottom-feed omni-directional CP (circularly polarized) antenna array is proposed in this letter. The antenna array is composed of four elements (two printed ZPS (zero-phase-shift) line loops and two half-wavelength dipoles). The four elements are fed with the same phase and amplitude. The ZPS line loops provide the horizontal polarization while the dipoles provide the vertical polarization. Ther
Rectenna panel design optimization for maximum RF power utilization
Vinita Daiya, Jemimah Ebenezer, R. Jehadeesan
Published online : 01-12-2019
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Now-a-days, far-field wireless power transfer/energy harvesting is underutilized due to the unavailability of proper methodology to design efficient system for maximum radio frequency (RF) power utilization. For efficient utilization of far-field RF energy an array/grid of rectenna, i.e. rectenna panel is required to generate the power from wireless signal. To minimize the engineering design phase
A novel defect ground structure for decoupling closely spaced -plane microstrip antenna array
Zicheng Niu, Hou Zhang, Qiang Chen, Tao Zhong
Published online : 01-12-2019
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In this paper, a novel decoupling technique for closely spaced -plane patch antennas using defect ground structure (DGS) is proposed. The electric field coupling between the antennas is suppressed by etching DGS which consists of a pair of rectangular slots and four stubs on the ground plane. Moreover, unlike the other methods, the DGS is not etched in the middle of the antennas but loaded along t
Aperture coupled stacked patch thin film antenna for automotive radar at 77 GHz
Osama Khan, Johannes Meyer, Klaus Baur, Saeed Arafat, Christian Waldschmidt
Published online : 01-12-2019
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A hybrid thin film multilayer antenna for automotive radar is presented in this work. A 2 × 8 aperture coupled stacked patch antenna array is realized on a single layer printed circuit board (PCB) using a novel thin film-based approach. Using a compact 180 phase difference power divider, inter-element spacing in a 2×2 sub-array is reduced. Measurement results show a 19% (67.9?82.5 GHz) impedance b
A polarization and band reconfigurable cross-slot antenna for multiband application
Kapil Saraswat, A. R. Harish
Published online : 01-12-2019
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A polarization and band reconfigurable cross-slot antenna for multiband applications is presented in this paper. The antenna consists of four p?i?n diodes embedded in the cross-shaped slot in a ground plane and excited by a microstrip feed line. The p?i?n diodes are placed in such a way that they produce multiple bands, with linearly and circularly polarized (CP) radiation. By switching the states
Selectivity and in-band impedance enhancement of a compact slot antenna with defected ground structures
Hailong Yang, Xiaoli Xi, Lili Wang, Yuchen Zhao, Xiaomin Shi
Published online : 01-12-2019
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In this study, a new ultra-wideband (UWB) band-edge selectivity antenna with a modified radiation slot using defected ground structure (DGS) is presented to obtain bandpass filtering reflection coefficient and gain performance. The well-designed DGS is designed on backside metallic of the substrate and can be seen as a low-pass filter that provides a good roll-off at a higher frequency. By connect
Broadband dual linear polarized (DLP) antenna array for energy harvesting system
Dalia N. Elsheakh
Published online : 01-12-2019
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A broadband linear polarized antenna is designed for radio frequency energy harvesting. The antenna covers the frequency range from 1 up to 6 GHz with relative impedance bandwidth of 126% at ?6 dB reflection coefficient || and extended from 1.1 to 3.3 GHz and from 4.2 to 5.6 GHz at |S| ? ?10 dB. A 2 2 dual linear polarized (DLP) antenna array is designed based on the antenna element by using equa
A miniaturized dual band EBG unit cell for UWB antennas with high selective notching
Mahmoud A. Abdalla, Abdullah A. Al-Mohamadi, Ibrahim S. Mohamed
Published online : 01-12-2019
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A high selective dual band and miniaturized electromagnetic band gap (EBG) unit cell is presented in this paper. The analysis and characterization of the new cell are explained. The modified compact EBG unit cell is based on cutting two inverted U-shaped slots inside the typical mushroom-like EBG. The modified EBG has a 70% size reduction. The dual-band functionality of the structure is confirmed
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