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1030 documents found for International Journal
Compact multi frequency strip loaded microstrip patch antenna with spur-lines
Avisankar Roy, Sunandan Bhunia, Debasree Chanda Sarkar, Partha Pratim Sarkar, Santosh Kumar Chowdhury
Published online : 01-06-2017
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In this paper a new design of compact single layered triangular slotted microstrip patch antenna with spur lines and strip loading is proposed. It has been experimentally investigated that strip loading causes more size reduction where spur lines and triangular slot introduces multi frequency operation of microstrip patch antenna. The size reduction has been found to be 87% for the proposed antenn
Microwave dielectric stepped-index flat lens antenna
Hernan Barba Molina, Jan Hesselbarth
Published online : 01-06-2017
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Dielectric stepped-index flat lens antennas for operation at 12 GHz are presented. A brick-shaped dielectric with a permittivity profile optimized for focusing is sandwiched between the metallic plates of an open-ended parallel-plate waveguide. A tapered slot antenna is placed at the focal point of the dielectric lens, thereby creating antennas with high directivity of 16.8 and 15.8 dBi, respectiv
Effects of bi-isotropic coatings and bi-isotropic background media upon gain characteristics of an axially slotted cylinder
Z. A. Awan
Published online : 01-06-2017
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An analysis about the effects of various bi-isotropic (BI) coatings and BI background media upon the gain characteristics of an axially slotted cylinder using numerical simulations is presented. It is investigated that chirality and Tellegen parameters of a coating and a background medium play a significant role in modifying the gain properties. It is further studied that an axially slotted cylind
Miniaturized bandpass filter using dual-mode hexagonal loop resonator
Kaijun Song, Yu Zhu, Minghua Zhao, Maoyu Fan, Yong Fan
Published online : 01-06-2017
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A novel miniaturized dual-mode bandpass filter (BPF) using hexagonal loop resonator is presented. In order to reduce the circuit size, capacitive loading structure is applied to enhance the self-capacitance and electrical length of the hexagonal loop resonator. The frequency selectivity and out-of-band rejection of the proposed BPF can be improved by the two inherent transmission zeros in each sid
2.45-GHz wideband harmonic rejection rectenna for wireless power transfer
Zhanyu Kang, Xianqi Lin, Cong Tang, Peng Mei, Wangmao Liu, Yong Fan
Published online : 01-06-2017
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In this paper, a 2.45-GHz wideband harmonic rejection rectenna for wireless power transfer is proposed. The rectenna comprises a microstrip-fed circular ring slot antenna (CRSA) and a series-parallel rectifier (SPR). A compact micro strip resonant cell is inserted into the CRSA so that the harmonic suppression over a wide bandwidth (3?8 GHz) can be obtained. The radio-frequency (RF)?DC conversion
Band-stop filter with suppression of requested number of spurious stopbands
Dusan A. Nesic, Branko M. Kolundzija
Published online : 01-06-2017
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Design method for band-stop filters (BSFs) that suppress a requested number of spurious bandstops and reduce ripples in the passbands below ~1 dB is proposed. BSF is designed in a form of a cascade of cells, each consisting of steps of equal electrical length, where the number of steps is used to control the number of suppressed spurious bandstops. Analytical formulas are developed that enable ini
Electromagnetic and small-signal modeling of an encapsulated RF-MEMS switch for D-band applications
Selin Tolunay Wipf, Alexander Göritz, Matthias Wietstruck, Christian Wipf, Bernd Tillack, Andreas Mai, Mehmet Kaynak
Published online : 01-07-2017
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In this work, an electromagnetic (EM) model and a small-signal (lumped-element) model of a wafer-level encapsulated (WLE) radio frequency microelectromechanical systems (RF-MEMS) switch is presented. The EM model of the WLE RF-MEMS switch is developed to estimate its RF performance. After the fabrication of the switch, the EM model is used to get accurate S-parameter simulation results. Alternativ
Multi-Octave bandwidth, 100 W GaN power amplifier using planar transmission line transformer
Mhd Tareq Arnous, Zihui Zhang, Felix Rautschke, Georg Boeck
Published online : 01-07-2017
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In this paper, design, implementation, and experimental results of efficient, high-power, and multi-octave gallium nitride-high electron mobility transistor power amplifier are presented. To overcome the low optima source/load impedances of a large transistor, various topologies of a broadside-coupled impedance transformer are simulated, implemented, and measured. The used transformer has a flat m
A SiGe-based fully-integrated 122-GHz FMCW radar sensor in an eWLB package
Muhammad Furqan, Faisal Ahmed, Reinhard Feger, Klaus Aufinger, Walter Hartner, Andreas Stelzer
Published online : 01-07-2017
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High-performance SiGe HBTs and advancements in packaging processes have enabled system-in-package (SiP) designs for millimeter-wave applications. This paper presents a 122-GHz bistatic frequency modulated continuous wave (FMCW) radar SiP. The intended applications for the SiP are short-range distance and angular position measurements as well as communication links between cooperative radar station
Analysis and design of a high-gain 100?180-GHz differential power amplifier in 130 nm SiGe BiCMOS
Faisal Ahmed, Muhammad Furqan, Klaus Aufinger, Andreas Stelzer
Published online : 01-07-2017
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This paper presents the design and measurement results of a high-gain D-band broadband power amplifier (PA) implemented in a 130 nm SiGe BiCMOS technology. The topology of the PA is based on four differential cascode stages with interstage matching networks. A detailed analysis of the frequency behavior of the transimpedance-gain of the common-base stage of the cascode is presented by means of sma
MRF volume 9 issue 5 Cover and Back matter
Published online : 01-05-2017
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MRF volume 9 issue 5 Cover and Front matter
Published online : 01-05-2017
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Design of a dual-wideband monopole antenna by artificial bee colony algorithm for UMTS, WLAN, and WiMAX applications
Deniz Ustun, Ali Akdagli
Published online : 01-06-2017
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In this study, a dual-wideband monopole antenna has been designed and developed for the universal mobile telecommunications system (UMTS), wireless local area network (WLAN), and worldwide interoperability for microwave access (WiMAX) applications. A novel approach integrating artificial bee colony (ABC) with the HyperLynx® 3D electromagnetic platform based on the method of moments has been employ
Highly compact UWB bandpass filter based on composite right/left-handed transmission line and meander fractal like ring slot in ground
Babu Lal Shahu, Srikanta Pal, Neela Chattoraj, Dileep Kumar Upadhyay
Published online : 01-06-2017
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An ultra-wideband (UWB) highly compact bandpass filter with extremely high passband bandwidth is presented. The proposed structure is made using three-staged stepped-impedance lines and a composite right/left-handed transmission line (CRLH-TL) synthesized with meander fractal like ring slot in the ground and series capacitive gap in conductor strip. The capacitive gap in conductor strip and meande
Countering method for active jamming based on dual-polarization radar seeker
Qiang Zhang, Weijun Pan
Published online : 01-06-2017
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In order to counter active jamming, an adaptive polarization cancellation method based on dual-polarization radar is proposed in the paper. First, respectively being obtained by vertical and horizontal polarization channels of dual-polarization radar, the signals from the real target and active jamming are analyzed in composition and characteristic. Then, the weight coefficient is timely derived i
Compact hybrid fractal antenna for wideband wireless applications
Yogesh Kumar Choukiker, Jagadish Chandra Mudiganti
Published online : 01-06-2017
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A compact size hybrid fractal antenna is proposed for the application in wideband frequency range. The proposed antenna structure is the combination of Koch curve and self-affine fractal geometries. The Koch curve and self-affine geometries are optimized to achieve a wide bandwidth. The feed circuit is a microstrip line with a matching section over a rectangular ground plane. The measured impedanc
Design of differential-mode bandpass filter with common-mode suppression using ring dielectric resonator
Jugul Kishor, Binod K. Kanaujia, Santanu Dwari, Ashwani Kumar
Published online : 01-06-2017
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Synthesis of differential-mode bandpass filter (BPF) with good common-mode suppression has been described and demonstrated on the basis of ring dielectric resonator (RDR) for high-performance communication system. A RDR with two pairs of feeding lines has been used to excite TE-mode. This unique combination of feeding lines and the ring resonator creates a differential passband. Meanwhile, TM-mode
Waveguide T-junctions with resonant coupling between sections of different dimensions
Sergey L. Berdnik, Victor A. Katrich, Mikhail V. Nesterenko, Yuriy M. Penkin
Published online : 01-06-2017
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Electromagnetic characteristics of the E-plane T-junction for two rectangular waveguides using resonant coupling between the waveguide sections were studied by mathematical modeling. The problem of coupling between infinite and semi-infinite rectangular waveguides through a resonant slot in the end-wall of the semi-infinite waveguide in the presence of resonant monopole is solved in a strict elect
A CPW-fed tapered slot antenna with improved time and frequency domain characteristics
Alireza Hokmabadi, Asghar Keshtkar, Alireza Bayat, Ahmad Keshtkar
Published online : 01-06-2017
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In this paper, a miniaturized CPW-fed tapered slot antenna (TSA) with a modified CPW to slot-line transition structure was introduced. An air-bridge and tapered slot edge (TSE) structure was also employed to broaden the transition bandwidth. Through these applied modifications, negative features of the original TSA (limitation of transition) and antipodal Vivaldi antenna (bad cross-polarization) a
Enhancement of the gain and bandwidth of the microstrip patch antenna with modified ground plane
Kalyan Mondal, Partha Pratim Sarkar
Published online : 01-06-2017
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In this work, microstrip antenna with W- and V-shaped radiating patches have been proposed. Here square- and circular-shaped modified ground planes have been designed by poly tetra fluoro ethylene (PTFE) substrate with dielectric constant 2.4. Broadband with high gain is obtained by optimum selection of radiating patch with modified ground plane. The ground planes are modified by loading a U-shape
Performance parameters prediction of slotted microstrip antennas with modified ground plane using support vector machine
Chandan Roy, Taimoor Khan, Binod Kumar Kanaujia
Published online : 01-06-2017
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Artificial neural networks (ANNs) have acquired enormous importance in computing of the performance parameters of microstrip antennas due to their generalized and adaptive features. However, recently the concept of support vector machines (SVMs) has become very much popular in performance parameters computation due to several attractive features over ANNs. Specifically, SVMs outreach ANNs noticeab
A miniature tri-band RFID reader antenna with high gain for portable devices
Bo Wang, Wenqing Wang
Published online : 01-06-2017
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This paper presents a miniature monopole reader antenna for tri-band radio frequency identification (RFID) portable devices. The proposed antenna operates at the main RFID frequencies and can alleviate and compensate for the shortcomings of a single-band antenna. An additional rectangular stub couples with the bent monopole antenna, allowing the latter to resonate at the RFID bands at 902?928 MHz,
Editorial
Ian Hunter, Alaa Abunjaileh, Laith Danoon
Published online : 01-09-2017
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MRF volume 9 issue 6 Cover and Back matter
Steve Nightingale, Alaa Abunjaileh, Laith Danoon
Published online : 01-09-2017
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MRF volume 9 issue 6 Cover and Front matter
Steve Nightingale, Alaa Abunjaileh, Laith Danoon
Published online : 01-09-2017
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