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1993 documents found for International Journal
Concept and analysis of a coupled split-ring resonator for wide-/dual bands, self-filtering, high out-of-band suppression and highly efficient antennas
Mahmoud A. Abdalla, Mohamed El Atrash, Nour A. El-Sobky, Sherif R. Zahran
Published online : 01-03-2021
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An inspired metamaterial-based highly efficient monopole antenna displaying wide-/dual-band resonances along with self-filtering properties is presented. The monopole has high out-of-band suppression characteristics that lead to very close to 0 dB band-stop between the antenna dual resonant bands. The antenna operates at the two WLAN services of 2.65?3.25 and 5?7 GHz with stopband with total refle
Microwave absorption study of dried banana leaves-based single-layer microwave absorber
Soumya Sundar Pattanayak, S. H. Laskar, Swagatadeb Sahoo
Published online : 01-03-2021
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The ever-increasing use of electronic devices leads to a dangerous upsurge in the emission of microwave radiation; this has drawn appreciable concern in the fabrication of eco-friendly microwave absorber (MA) and it can be a prospective alternative. Present work, in the quest for possible alternatives, explores carbon-rich agricultural residues such as dry banana leaves as a microwave-absorbing ma
A compact flexible textile artificial magnetic conductor-based wearable monopole antenna for low specific absorption rate wrist applications
Mohamed El Atrash, Mahmoud A. Abdalla, Hadia M. Elhennawy
Published online : 01-03-2021
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A compact monopole antenna backed with a 1 × 2 textile-based artificial magnetic conductor (AMC) array is proposed. Textile was mainly selected for the AMC materials according to an investigation that took place between different AMC substrate materials, where it was settled that the textile one displayed the highest antenna gain and efficiency. The monopole antenna and the AMC, distanced apart by
The efficient implementation of IE-FFT algorithm with combined field integral equation for solving electromagnetic scattering problems
Seung Mo Seo
Published online : 01-03-2021
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An integral equation-fast Fourier transform (IE-FFT) algorithm is applied to the electromagnetic solutions of the combined field integral equation (CFIE) for scattering problems by an arbitrary-shaped three-dimensional perfect electric conducting object. The IE-FFT with CFIE uses a Cartesian grid for known Green's function to considerably reduce memory storage and speed up CPU time for both matrix
IJMWT Special Issue on the 2019 National Microwave Days
Philippe Descamps
Published online : 01-02-2021
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MRF volume 13 issue 1 Cover and Back matter
Published online : 01-02-2021
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MRF volume 13 issue 1 Cover and Front matter
Published online : 01-02-2021
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A 31 GHz body-biased configurable power amplifier in 28 nm FD-SOI CMOS for 5 G applications
Florent Torres, Eric Kerhervé, Andreia Cathelin, Magali De Matos
Published online : 01-02-2021
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This paper presents a 31 GHz integrated power amplifier (PA) in 28 nm Fully Depleted Silicon-On-Insulator Complementary Metal Oxide Semiconductor (FD-SOI CMOS) technology and targeting SoC implementation for 5 G applications. Fine-grain wide range power control with more than 10 dB tuning range is enabled by body biasing feature while the design improves voltage standing wave ratio (VSWR) robustne
Miniature drone antenna design for the detection of airliners
Alassane Sidibe, Gaël Loubet, Alexandru Takacs, Guillaume Ferré, Anthony Ghiotto
Published online : 01-02-2021
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In this paper, the design of a miniature antenna dedicated to the detection of airliners through the demodulation of Automatic Dependence Surveillance-Broadcast system (ADS-B) signals is presented. This antenna is designed for being embedded on the top of a drone in order to detect and avoid collisions with airliners. This antenna consists of an array of Planar Inverted-F Antennas, a quadrature fe
A compact dual band-notched SWB antenna with high bandwidth dimension ratio
Aliakbar Dastranj, Ghazaleh Lari, Mosayeb Bornapour
Published online : 01-02-2021
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In this research, a compact dual band-notched (DBN) super-wideband (SWB) coplanar waveguide-fed antenna with high bandwidth (BW) dimension ratio of 7427.4 has been presented. The proposed antenna covers a very wide frequency range from 2.8 to 40 GHz (BW ratio of 14.28:1) with ||
Further realization of a flexible metamaterial-based antenna on indium nickel oxide polymerized palm fiber substrates for RF energy harvesting
Taha A. Elwi, Ali M. Al-Saegh
Published online : 01-02-2021
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This paper discusses the design and fabrication of a low-profile Hilbert-shaped metamaterial (MTM) array-based antenna, forming a rectangular patch with partial ground plane backing; the rest is slotted with traces for RF energy harvesting. The antenna is mounted on a 28 mm × 32 mm indium nickel oxide polymerized palm fiber (INP) substrate and compared to the identical one based on FR4 substrate.
A 3-bit load-pulling digital power amplifier
Gavin T. Watkins
Published online : 01-02-2021
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A radio frequency (RF) 3-bit digital power amplifier (DPA) is described in this paper. It consists of three RF amplifiers connected at their outputs with a transmission line (TL) network. The three amplifiers are designed for different output powers (). The TL network allows them to load-pull one other to achieve eight different amplitude states by alternatively enabling and disabling the amplifie
Feather-shaped super wideband MIMO antenna
Sarthak Singhal
Published online : 01-02-2021
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Two configurations of a modified feather-shaped antenna element are proposed for super wideband (SWB) multiple-input multiple-output (MIMO) applications. The antenna element geometry comprises of a circular slot-loaded feather-shaped radiator and rectangular notch-loaded quarter elliptical coplanar waveguide ground plane. An operating bandwidth of 4.4?51.5 GHz with inter-port isolation, ? 15 dB f
An ultra-wideband, polarization insensitive metamaterial absorber based on multiple resistive film layers with wide-incident-angle stability
Guangsheng Deng, Kun Lv, Hanxiao Sun, Yuan Hong, Xiaoying Zhang, Zhiping Yin, Ying Li, Jun Yang
Published online : 01-02-2021
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In this work, we propose a broadband, polarization-insensitive and wide incident angle stable metamaterial absorber (MA) based on the resistive film. The absorber consists of a three-layer structure with each layer of dielectric substrate printed with different shapes of resistive film. The multilayer structure not only extends the absorption bandwidth but also maintains high absorption under larg
Separately-designable diplexer with multiple transmission zeroes using common stub-loaded SIR
Yu-Jing Zhang, Jing Cai, Jian-Xin Chen
Published online : 01-02-2021
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A separately-designable diplexer with multiple transmission zeroes (TZs) using common stub-loaded stepped impedance resonator (SIR) is proposed. The common stub-loaded SIR operating in third harmonic () and fifth harmonic () is used for designing the two diplexer channels. The stub is loaded at the voltage-null point of of the SIR. It can separately control but has no effect on so that the two
Design of a wearable MIMO antenna deployed with an inverted U-shaped ground stub for diversity performance enhancement
Anupma Gupta, Ankush Kansal, Paras Chawla
Published online : 01-02-2021
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A compact multiple input multiple output (MIMO) antenna operating at 2.45 GHz industrial scientific and medical band is presented for wearable devices. Open-end slotting is used to miniaturize the antenna dimensions. Inverted U-shaped ground stub is incorporated to reduce mutual coupling. On-body performance is analyzed on a three-layered equivalent tissue phantom model. The wide bandwidth of 300
Integration of RF rectenna with thin film solar cell to power wearable electronics
B. Naresh, Vinod Kumar Singh, V. K. Sharma
Published online : 01-02-2021
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This paper reports an integration of dual band microstrip antenna with thin film amorphous silicon solar cell which creates a wearable system to harvest microwave energy. The multiple layers in the encapsulation of the thin film solar cell are used as a substrate for microstrip antenna. The rectifier and matching circuit are designed on cotton jeans material and the whole system is mechanically su
MRF volume 12 issue 10 Cover and Back matter
Published online : 01-12-2020
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MRF volume 12 issue 6 Cover and Back matter
M. Sierra Castaner, S. Monni
Published online : 01-07-2020
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MRF volume 12 issue 10 Cover and Back matter
Published online : 01-12-2020
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MRF volume 12 issue 10 Cover and Front matter
Published online : 01-12-2020
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Dual-/tri-band bandpass filters with fully independent and controllable passband based on multipath-embedded resonators
Yang Xiong, Wei Zhang, Yue-Peng Zhong, Li-Tian Wang
Published online : 01-12-2020
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In this paper, dual-band and tri-band bandpass filters (BPFs) with fully independent and controllable passbands based on multipath-embedded resonators are presented. The dual-band BPF consists of two double open-ended stub-loaded terminal-shorted resonators (DOESL-TSRs) with a common via-hole connected along the symmetric plane of the filter. Based on DOESL-TSRs, a triple open-ended stub-loaded te
A multi-function resonator based on an asymmetric tri-post rectangular waveguide section
Lyudmila P. Mospan, Sergiy O. Steshenko
Published online : 01-12-2020
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A novel waveguide resonator is proposed in the paper. The resonator is composed of three rectangular partial-height posts inserted along a rectangular waveguide cross-section. A pair of lateral posts is mounted symmetrically whereas the third antipodal post is centered. The resonator enables bandreject, singlet-type, and pseudoelliptic responses. The operating regimes are achieved by a manipulatio
On different load configurations for mixed-mode load-pull measurements, hybrid imperfections, and tuning ranges
David Veit, Michael Gadringer, Erich Leitgeb
Published online : 01-12-2020
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Each of the various methods for mixed-mode load-pull measurements, which can be found in literature, has its own advantages and disadvantages. In this publication, we analyze two of the most commonly used setups and a third setup of which we provided an initial treatment in a previous publication. We investigated the impact of 180° hybrids on the tuning capabilities of a mixed-mode load-pull syste
Dielectric sensitivity of different antennas types for microwave-based head imaging: numerical study and experimental verification
Jan Tesarik, Tomas Pokorny, Jan Vrba
Published online : 01-12-2020
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The design of proper antenna element (AE) for microwave-based head imaging or brain stroke detection is a crucial challenge in the development process of microwave imaging (MWI) systems. The main purpose of this paper was to design, fabricate, and experimentally verify the compact and dimensions-reduced H-slot antenna suitable for the new generation of multichannel MWI system for brain stroke dete
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