Flexible Wearable Pre-fractal Antennas for Personal High-Temperature Monitoring

Silva, Paulo F.; Santana, Ewaldo Éder Carvalho; Pinto, Mauro S. S.; Freire, R.C.S.; Oliveira, Maciel Alves de; Fontgalland, Glauco; Silva, Paulo H. F.

doi:10.1007/s11277-020-07458-0

Cited by 10 publications

(8 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to [19] the design values of a planar monopole can be approximated from the perimeter (p) of antennas with circular and square shapes. According to [18], the current distribution is more concentrated at the ends than at the centre of the radiating element, the distance travelled by the current influences the resonant frequency of the antenna, so increasing the antenna perimeter provides a reduction in the first resonant frequency (fr), which can be got by: (1) were 𝜀 𝑟𝑒𝑓𝑓 is the effective permittivity, given by [19]:…”

Section: Monopole Directional Antennamentioning

confidence: 99%

“…The antennas are important devices because they perform the receiver and transmission of signals, which should present a compact structure, low-cost, circular polarization, and wideband. Several techniques are used in antennas to modify the shape and parameters, including fractal and bioinspired technologies [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…Bioinspired antennas are devices that use shapes of living beings to alter some antenna response parameters and are used in several applications, such as narrow-band, wideband, ultra-wideband, wireless local area network, wireless fidelity, industrial, scientific and medical-ISM, mobile communications, and manifold antenna types, including, patch, planar monopole, aperture, etc. [1][2][3][4][5]. The shapes of the radiating elements of the bioinspired antennas can be generated by several methods, such as drawing in simulator software, and images generated by equations [2,4,5,[11][12][13].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Monopole Directional Antenna Bioinspired in Elliptical Leaf with Golden Ratio for WLAN and 4G Applications

Froes

Silva

Santana

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

In this work, it is proposed the development a monopole directional antenna, bioinspired in elliptical leaf, with aperture by golden ratio, for 4G band application. The shape antenna is generated by Gielis formula, built in FR4 substrate, with apertures calculated by golden ratio, for increasing the antenna perimeter, and to turner the resonance frequency. To compare the results of the bioinspired monopole on the elliptical sheet, a square-shaped monopole antenna was designed, simulated and measured, the structures were designed in the MATLAB program and the simulations were performed in the Ansys program. In the results compared between the square monopole and the bioinspired antenna in the elliptical sheet, it can be seen that the measured bioinspired antenna, compared to the square monopole, presented a bandwidth reduction of 77.27%, a more compact structure, with a reduction of 98%, covering the wireless local area network, and long-time evolution 4G at 2.5 GHz. The proposed technique uses a reflector on the ground plane, to change the parameters of the monopole planar antenna, of omnidirectional radiation pattern to a directional, maintaining the characteristics of the broadband, half-power beamwidth great than 100º, with high current density, and similar gain of a directional antenna. From the results, it has been observed that the elliptical leaf monopole antenna shows broadband characteristics, with a half-power beamwidth of 128 degrees, wideband, the bandwidth of 500 MHz, a gain of 6.28 dBi, a current density of 13.01 A/m², and circular polarization.

show abstract

Section: Monopole Directional Antennamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Monopole Directional Antenna Bioinspired in Elliptical Leaf with Golden Ratio for WLAN and 4G Applications

Froes

Silva

Santana

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…Large-sized fractal antennas with full ground plane [21,22] are more sensitive to deformations. Other fractal antennas are proposed by [23] and [24], where these designs provide a complex geometry. In [25], a monopole tree fractal antenna consists of a patch element mounted on an isotropic dielectric layer over a truncated ground plane for different wireless applications.…”

Section: Introductionmentioning

confidence: 99%

Design of Flexible Dual-Band Tree Fractal Antenna for Wearable Applications

Alkhafaji¹,

Abdulsatar²,

Ali³

2022

PIER C

View full text Add to dashboard Cite

A dual-band flexible monopole antenna for wearable applications is presented. The antenna structure is built based on tree-shaped fractal geometry. The suggested antenna is printed on Rogers RT5870, a semi-flexible material with a relative dielectric constant and loss tangent of 2.33 and 0.0012, respectively. According to the results, the proposed antenna achieves dual impedance bandwidth ranging from 1.72 to 1.88 GHz for the lower band and 5.1 to 5.33 GHz for the upper band. The simulated results show that the fractional impedance bandwidths and realized gains of the antenna are 8.9/4.8% and 1.47/5.67 dBi for the 1.81/5.2 GHz, respectively. The antenna's performance under various bending scenarios has also been demonstrated at both resonant frequencies. The overall size of the proposed antenna is about 45 × 41 × 0.25 mm 3 . The antenna shows good performance to be a candidate for wearable applications.

show abstract

Section: Introductionmentioning

confidence: 99%

Monopole directional antenna bioinspired in elliptical leaf with golden ratio for WLAN and 4G applications

Froes

Silva

Santana

et al. 2022

Sci Rep

Self Cite

View full text Add to dashboard Cite

In this work, it is proposed the development a new monopole directional antenna, bioinspired in elliptical leaf, with cut by golden ratio, for 4G band application, by the use of the technique of the cut of the radiating element for the increasing of the antenna perimeter, being the first work to use this technique in a bioinspired antenna, promotes resonance frequency turned, and reconfiguring of the antenna parameters as bandwidth, radiation pattern and gain, with the use of the reflector near to the group plane, without the insertion of active devices as the pin diode or change in radiating element. The shape antenna is generated by Gielis formula, built in FR4 substrate, with cuts calculated by golden ratio. To compare the results of the bioinspired monopole on the elliptical sheet, a square-shaped monopole antenna was designed, simulated and measured, the structures were designed in the MATLAB software version 2015(b) and the simulations were performed in the Ansys software version 2016. In the results compared between the square monopole and the bioinspired antenna in the elliptical sheet, it can be seen that the measured bioinspired antenna, compared to the square monopole, presented a bandwidth reduction of 77.27%, a more compact structure, with a reduction of 98%, covering the wireless local area network, and long-time evolution 4G at 2.5 GHz. The proposed technique uses a reflector on the ground plane, to change the parameters of the monopole planar antenna, of omnidirectional radiation pattern to a directional, maintaining the characteristics of the broadband, half-power beamwidth great than 100°, with high current density, and similar gain of a directional antenna. From the results, it has been observed that the elliptical leaf monopole antenna shows broadband characteristics, with a half-power beamwidth of 128°, wideband, the bandwidth of 500 MHz, a gain of 6.28 dBi, a current density of 13.01 A/m2, and circular polarization.

show abstract

Flexible Wearable Pre-fractal Antennas for Personal High-Temperature Monitoring

Cited by 10 publications

References 12 publications

Monopole Directional Antenna Bioinspired in Elliptical Leaf with Golden Ratio for WLAN and 4G Applications

Monopole Directional Antenna Bioinspired in Elliptical Leaf with Golden Ratio for WLAN and 4G Applications

Design of Flexible Dual-Band Tree Fractal Antenna for Wearable Applications

Monopole directional antenna bioinspired in elliptical leaf with golden ratio for WLAN and 4G applications

Contact Info

Product

Resources

About