Magneto Tuning of a Ferrite Dielectric Resonator Antenna Based on LiFe5O8 Matrix

Morais, J. E. V. de; Castro, A.J. Ramiro de; Oliveira, R. G. M.; Carmo, F. F. do; Sales, A. J. M.; Sales, Juscelino Chaves; Silva, M. A. S.; Gouveia, D. X.; Costa, M. M.; Rodrigues, Alisson Mendes; Sombra, A. S. B.

doi:10.1007/s11664-018-6255-0

Cited by 9 publications

(5 citation statements)

References 31 publications

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“…For operations at a higher frequency range, antenna devices can be developed using substrates based on chitosan films with up to 50% of SPIONs, collagen until 30% of filler and pure BC film-form. However, the inapplicability of the other biopolymer-based composites is not taken into consideration, since their properties can be adjusted with a magnetic field [61,62]. Another possibility is adjusting the dimensions of ground plane and patch of prototypes.…”

Section: Design and Characterization Of The Microstrip Patch Antennasmentioning

confidence: 99%

From Magneto-Dielectric Biocomposite Films to Microstrip Antenna Devices

et al. 2020

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Magneto-dielectric composites are interesting advanced materials principally due to their potential applications in electronic fields, such as in microstrip antennas substrates. In this work, we developed superparamagnetic polymer-based films using the biopolymeric matrices chitosan (Ch), cellulose (BC) and collagen (Col). For this proposal, we synthesized superparamagnetic iron oxide nanoparticles (SPIONs) functionalized with polyethyleneimine with a cheap method using sonochemistry. Further, the SPIONs were dispersed into polymer matrices and the composites were evaluated regarding morphology, thermal, dielectric and magnetic properties and their application as microstrip antennas substrates. Microscopically, all tested films presented a uniform dispersion profile, principally due to polyethyleneimine coating. Under an operating frequency (fo) of 4.45 GHz, Ch, BC and Col-based SPION substrates showed moderate dielectric constant (ε′) values in the range of 5.2–8.3, 6.7–8.4 and 5.9–9.1, respectively. Furthermore, the prepared films showed no hysteresis loop, thereby providing evidence of superparamagnetism. The microstrip antennas showed considerable bandwidths (3.37–6.34%) and a return loss lower than −10 dB. Besides, the fo were modulated according to the addition of SPIONs, varying in the range of 4.69–5.55, 4.63–5.18 and 4.93–5.44 GHz, for Ch, BC and Col-based substrates, respectively. Moreover, considering best modulation of ε′ and fo, the Ch-based SPION film showed the most suitable profile as a microstrip antenna substrate.

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Section: Design and Characterization Of The Microstrip Patch Antennasmentioning

confidence: 99%

From Magneto-Dielectric Biocomposite Films to Microstrip Antenna Devices

et al. 2020

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“…One promising application in resonator research field is DRA 8 or ferrimagnetic resonator antenna (FRA) 9,10 . The ferrimagnetic materials application as FRA is interesting due its lower conductivity than conducting materials, which reduces the heating losses, 11 and presents the tuning possibility 12 . Different synthesis techniques, and modification in process variables, are applied to modify electrical and magnetic characteristics of materials 13 …”

Section: Introductionmentioning

confidence: 99%

Design and analysis of nickel ferrite resonator antenna for C band applications

Silva

D’Assunção

Oliveira

et al. 2021

Micro & Optical Tech Letters

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This article shows the design of dielectric resonator antenna with nickel ferrite as dielectric material. Its main characteristics and measurements are described. Nickel ferrite was synthetized by sol–gel modified by ionic coordination reaction technique. Calcination was performed at 1100°C (10 h, 10°C/min step), followed by compression procedure at 227 MPa, to manufacture the bulk. Sintering process was applied at calcination temperature, for 4 h, to ensure bulk's physical resistance, and its electrical characterization was performed for antenna design and simulations. Simulated radiation patterns are presented, as reflection coefficient, which is compared with measurements. Measured reflection coefficient presented good agreement with performed simulations, with a difference of 0.74% in resonance frequency. Simulated radiation patterns also presented good results, with relatively high gain in co‐polarization planes, 2.11 dB for E plane, and low cross‐polarization E plane value, −47 dB.

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“…The development of ceramic composites for wireless transmission systems applications has been a subject of research and discussions in technological institutes, universities, and companies. The increasing demand for solutions for this branch of the telecommunications sector, which involves low energy consumption, minimization of component dimensions and cost reduction, has led to an interest in ceramic composites [2]. Ceramic composites are attractive for telecommunications because of the flexibility of features that can be obtained by the mixture of two or more phases, providing new materials with a wide range of properties (mechanical, magnetic, optical and dielectric properties) that can be controlled through phase composition to meet the desired specifications necessary for a particular application.…”

Section: Introductionmentioning

confidence: 99%

“…The increasing development of composites associated with the propagation of signals in the microwave range allows the use of these materials in wireless applications and in the design of antennas. For the construction of these composites, the ferrites are important because of their applications in telecommunications and electronic devices, while the bismuth-based ceramics are suitable for the application of antennas due to their relatively high dielectric constant and low dielectric loss in the RF and microwave range [2,5,6]. A combined study of both the crystal structure and the electrophysical properties of new compounds and solid solutions is necessary for the development of new ceramic materials.…”

Section: Introductionmentioning

confidence: 99%

Characterization of the BFO-BZN-based electroceramic composite for application as DRA

et al. 2020

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The study and development of ceramic composites are important because of the properties that these materials can provide, such as high dielectric constant and low dielectric loss in the RF and microwave range. Such characteristics make this type of material appropriate to several segments, such as in the telecommunication sector, especially in dielectric resonator antenna (DRA). Ceramic composites provide new materials with a range of properties that can be controlled through the phases to meet the specifications of a given application. This study aimed to synthesize and characterize the composite based on hexaferrite (BFO) and ceramics based on bismuth (BZN), aiming application as DRA. The composites were characterized by FTIR, XRD, and SEM. The composites presented a compact and heterogeneous microstructure, indicating that the sintering at 1000 °C/150 min was adequate for obtaining the ceramic composites; besides, BFO-BZNβ composite was shown to be less porous than the composite BFO-BZNα.

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Magneto Tuning of a Ferrite Dielectric Resonator Antenna Based on LiFe5O8 Matrix

Cited by 9 publications

References 31 publications

From Magneto-Dielectric Biocomposite Films to Microstrip Antenna Devices

From Magneto-Dielectric Biocomposite Films to Microstrip Antenna Devices

Design and analysis of nickel ferrite resonator antenna for C band applications

Characterization of the BFO-BZN-based electroceramic composite for application as DRA

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