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967 documents found for International Journal
Rigorous study of propagation in metallic circular waveguide filled with anisotropic metamaterial
Hedi Sakli, Mohamed Yahia, Wyssem Fathallah, Jun Wu Tao, Taoufik Aguili
Published online : 01-05-2017
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This paper presents an extension of the formulation of wave propagation in transverse electric (TE) and transverse magnetic (TM) modes in the case of metallic circular waveguides filled with anisotropic metamaterials. The determined higher-order modes have been analyzed and exploited to the design of filters. Among the particularities of anisotropic material, the backward waves can propagate below
Broadband capacitively grounded coplanar to coupled microstrip transition for planar microwave photonic components
Massinissa Hadjloum, Mohammed El Gibari, Hongwu Li, Afshin S. Daryoush
Published online : 01-05-2017
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Broadband transitions are presented in this paper for capacitively grounded coplanar waveguide to coupled microstrip (CMS) lines. These transitions are realized on both thick Rogers RO3003 substrate (thickness of 10 mils) and a thin benzocyclobutene (BCB) polymer film (thickness of 20 µm). A flat bandwidth of 4?20 GHz and 3.2 to over 40 GHz are measured for the RO3003 and BCB polymer substrates, r
Interference cancellation for higher harmonics of supply-modulated efficient RF power amplifier systems
Mohammad Omer, Farasat Munir
Published online : 01-05-2017
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In building highly efficient transmitters of today, one is forced to sacrifice linearity for efficiency. Some of the highest power amplifier efficiency figures are reported by envelope tracking (ET) amplifiers. These amplifiers can generate strong higher-order harmonics, which can lead to interference with receivers operating at the harmonic frequencies. Using non-linear interference cancellation,
A novel single-feed reconfigurable antenna for polarization and frequency diversity
Ailar Sedghara, Zahra Atlasbaf
Published online : 01-06-2017
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A novel dual-band single-feed reconfigurable annular-ring slot antenna with polarization diversity is proposed. This antenna has the ability to switch frequency bands and polarization at the same time whereas applying a simple structure. It consists of two concentric circular slots and two tuning stubs on one side of the substrate and a 50 ? microstrip feed line and two stubs on the other side. Th
Compact UWB?MIMO antenna with quad-band-notched characteristic
Ling Wu, Yingqing Xia
Published online : 01-06-2017
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With quad-band-notched characteristic, a compact ultrawideband (UWB) multiple-input-multiple-output (MIMO) antenna is introduced in the paper. The UWB?MIMO system has two similar monopole elements and occupies 30 × 45 mm. By inserting two L-shaped slots, CSRR and C-shaped stubs, four notched bands are achieved (3.25?3.9, 5.11?5.35, 5.5?6.06, and 7.18?7.88 GHz) to filter WiMAX, lower WLAN, upper WL
Gain and bandwidth enhancement of New Planar microstrip array antennas geometry for C band weather radar applications
Abdellatif Slimani, Saad Dosse Bennani, Ali El Alami, Mohamed Amellal
Published online : 01-06-2017
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A 4?8 GHz ultra wide band microstrip array antennas with improved gain for weather Radar applications was designed and fabricated. The microstrip radiating elements of the proposed array antennas are powered using a T-junction power divider with quarter wave-transformer impedance for a best matching. The design of this array antennas is based on the geometry of a linear array antennas well studied
Theoretical and experimental development of a high-conversion-efficiency rectifier at X-band
Feifei Tan, Changjun Liu
Published online : 01-06-2017
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Voltage doubler rectifiers are usually applied to systems with high voltage and low current requirement. An X band voltage doubler rectifier has been developed with 72% conversion efficiency. To the best of our knowledge, the obtained rectifying efficiency is the maximum reported to date at X band with Schottky diodes. The working characteristics of the diodes in the voltage doubler rectifier are
Compact dual-band antennas with large frequency ratio and bandwidth enhancement for wireless applications
Abdelheq Boukarkar, Xian Qi Lin, Yuan Jiang
Published online : 01-06-2017
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In this paper, compact single-feed dual-band antennas for different wireless applications are proposed. First, a dual-band antenna with a comparatively large frequency ratio of 2.58 is designed. Then, a novel dual-band antenna is introduced in order to enhance the upper frequency band. The technique consists of modifying the feed line structure, which leads to a 9.23% of impedance bandwidth at the
An ACS-fed F-shaped monopole antenna for GPS/WLAN/WiMAX applications
Wang Ren, Shu-Wei Hu, Chen Jiang
Published online : 01-06-2017
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In this paper, an asymmetric coplanar strip (ACS)-fed quad-band monopole antenna for the global positioning system (GPS), wireless local area network (WLAN), and worldwide interoperability for microwave access (WiMAX) applications is proposed. It is composed of an F-shaped monopole and a partial ground plane, which are both printed on one side of a low-cost FR4 substrate with a compact volume of 4
A compact microstrip low-pass filter with ultra wide stopband using compact microstrip resonant cells
Saeed Roshani
Published online : 01-06-2017
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In this paper, a novel compact microstrip low-pass filter (LPF) with ultra wide stop band and sharp roll off, is proposed. In the proposed structure, a high impedance transmission line is loaded by compact microstrip resonant cells, which results in ultra wide stopband. The ?3 dB cut-off frequency of filter is 1.5 GHz and the maximum insertion loss is <0.1 dB in the passband. The proposed LPF pres
Band-pass filtering Gysel power divider with inherent DC-block function and high all-frequency isolation
Yongle Wu, Lingxiao Jiao, Jiayu Wang, Weimin Wang, Yuanan Liu
Published online : 01-06-2017
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A novel small-size filtering power divider (PD) featured four-function integration is proposed. These four integrated functions are high-selectivity filtering, inherent DC block, high all-frequency isolation, and high-power applications. Using single-layer planar circuit technology, this proposed PD can be implemented easily. The measured results of a prototype show that it can operate at 2 GHz wi
Using intrinsic zero to notch satellite signals in UWB filter
Yang Xiong, Cheng Teng, Ming He, Kam-Weng Tam, Xian Yu, Wai-Wa Choi, Hai Hua Chen
Published online : 01-06-2017
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In this paper, an ultra-wideband (UWB) filter with a notch band using T-shaped step impedance resonator loaded with cross-shaped open stubs has been presented. The notch band is formed by utilizing intrinsic zero. The characteristics of the new quad-mode resonator have been analyzed using odd-even mode analysis method. It can be shown that it is the intrinsic zero that generates the notch band. In
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
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