Ultra Wideband
Mostrando 1-12 de 23 artigos, teses e dissertações.
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1. Compact Triple Band Notched Pentagonal Shaped UWB Antenna Loaded with Slots and Parasitic Resonator
Abstract In this paper, a compact, planar printed microstrip line fed pentagonal shape ultra-wideband antenna with triple band-notched characteristics is proposed and investigated. By incorporating a pair of mirrored Γ-shape, a pair of mirrored L-shape slots in the pentagonal patch and bent C-shape parasitic strip at the backside of a patch, the tunable ban
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2021-06
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2. Ground-Penetrating Radar Antenna Design for Homogeneous and Low-Loss Dielectric Multilayer Media
Abstract Non-destructive evaluation of multilayer media represents an electromagnetic inverse problem, usually solved with analysis techniques in the time and frequency domains. The time- domain analysis technique depends directly on the accurate detection of reflected peaks measured by ground-penetrating radar (GPR), which limits this technique when the ref
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2020-06
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3. A High Gain and Directivity Bow Tie Antenna Based on Single-Negative Metamaterial
Abstract This paper presents an antenna loaded with metamaterial to enhance its gain and directivity to improve the performance of a ground-penetrating radar system (GPR). We adjusted the parameters of the antenna to change its equivalent capacitance and inductance and applied an operating frequency of 0.5 GHz-1.2 GHz to create an ultra-wideband antenna. On
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2018-06
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4. Designing Four Notched Bands Microstrip Antenna for UWB Applications, Assessed by Analytic Hierarchy Process Method
Abstract In this study, a novel microstrip fed Ultra Wideband (UWB) antenna is presented. The proposed antenna, with a size of 26×30×1.6mm3, is capable of removing four bands of interference in the coverage band. Firs, three filtered bands are created by cutting U, L, and C-shapes, a horizontal line on the patch, and fed line of antenna. The fourth notch i
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-09
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5. A Compact Ultrathin Ultra-wideband Metamaterial Microwave Absorber
Abstract A simple design of compact ultra-wideband, ultra-thin metamaterial microwave absorber has been presented. The unit cell of the proposed design is composed of diagonally placed ‘microstrip bend’ like patches printed on grounded dielectric substrate. The simulation results demonstrate the 10-dB absorption bandwidth of 7.19 GHz from 10.45 GHz to 17
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-04
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6. A Compact UWB Monopole Antenna with Rejected WLAN Band using Split-Ring Resonator and Assessed by Analytic Hierarchy Process Method
Abstract The design of a compact microstrip line-fed Ultra-wideband (UWB) monopole antenna with a notched band characteristic is presented in this paper. The rejection frequency band occurs around 5-6 GHz, which is appropriate for wireless local area network (WLAN) applications and is obtained by a split-ring resonator on the antenna ground plane. The propos
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-04
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7. Design of a Compact UWB Bandpass Filter using Via-Less CRLH TL
Abstract A novel compact ultra wideband (UWB) bandpass filter (BPF) based on composite right/left handed transmission line (CRLH TL) is reported in this paper. The proposed UWB BPF is designed and developed by coupling of two unit-cells of via-less CRLH TL, excited by asymmetrical coplanar waveguide (CPW) feed-line. The unit cell of CRLH TL is designed using
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-04
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8. A low-profile and ultra-wideband printed antenna with a 176% bandwidth
Abstract This work reports the development of a simple, low-profile and ultra-wideband printed antenna. The proposed antenna is based on a truncated ground plane and an impedance matching structure formed by a round junction and two chamfers; these modifications significantly increase the antenna frequency bandwidth compared to conventional microstrip antenn
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-03
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9. A Compact UWB Bandpass Filter using Hybrid Fractal Shaped DGS
Abstract In this paper, a novel and compact ultra wideband (UWB) bandpass filter (BPF) based on fractal-shaped defected ground structure (DGS) is designed and developed. It is made of stepped impedance lines and a composite right/left handed-transmission line (CRLH-TL) constructed with capacitive gap in conductor strip and a hybrid fractal-shaped ring slot i
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-03
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10. Polarization Diversity on ESM Systems
Abstract Polarization diversity antenna arrays are applied to electronic support measures (ESM) systems since the 1980s. However, even today modern systems are conceived with the employment of the traditional and inconvenient spiral antennas and there are no studies that evidences most of the benefits of this technique applied to them. This paper aims at sho
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-03
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11. A Compact Dual-Band Octagonal Slotted Printed Monopole Antenna for WLAN/ WiMAX and UWB Applications
AbstractA compact (20 x 20 mm2 size), coplanar waveguide (CPW) fed, octagonal slotted, dual-band antenna is presented in this paper. The proposed antenna has a simple structure consisting of an octagonal slot, L-shape stub, and a two stepped rectangular patch. The introduction of the L-shaped metallic stubs in the ground plane generates a lower resonance fre
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2015-06
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12. Simulation and manufacturing of a miniaturized exponential UWB TEM horn antenna for UWB radar applications
This paper presents the parameterization of the structure of a miniaturized exponential UWB TEM horn antenna and its effect on the matching impedance and directivity. In addition, a microstrip balun that feeds the antenna was proposed in order to improve the balance, and the return loss for low frequencies. Both the antenna and the microstrip balun were simu
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-12