Design of high return loss logarithmic spiral antenna

Morbidel, Leonardo; Rossini, Laureano A. Bulus; Caso, Pablo A. Costanzo

doi:10.1002/mop.30777

Cited by 8 publications

(5 citation statements)

References 20 publications

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“…The maximum angle of the nth radius is defined by

while the

represents the initial angle at the origin of the spiral turn. The parameter a determines the growth rate of spiral turns [ 40 , 41 ]. The high frequency operation of the antenna is limited by the inner radius ( r 1 ).…”

Section: Rectenna Designmentioning

confidence: 99%

Numerical Analysis of MIM-Based Log-Spiral Rectennas for Efficient Infrared Energy Harvesting

Yahyaoui

Elsharabasy

Yousaf

et al. 2020

Sensors

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This work presents the design and analysis of a metal-insulator-metal (MIM)-based optical log spiral rectenna for efficient energy harvesting at 28.3 THz. To maximize the benefits of the enhanced field of the proposed nano-antenna in the rectification process, the proposed design considers the antenna arms (Au) as the electrodes of the rectifying diode and the insulator is placed between the electrode terminals for the compact design of the horizontal MIM rectenna. The rectifier insulator, Al2O3, was inserted at the hotspot located in the gap between the antennas. A detailed analysis of the effect of different symmetric and asymmetric MIM-configurations (Au-Al2O3-Ag, Au-Al2O3-Al, Au-Al2O3-Cr, Au-Al2O3-Cu, and Au-Al2O3-Ti) was conducted. The results of the study suggested that the asymmetric configuration of Au-Al2O3-Ag provides optimal results. The proposed design benefits from the captured E-field intensity, I-V, resistivity, and responsivity and results in a rectenna that performs efficiently.

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“…The maximum angle of the nth radius is defined by

while the

Section: Rectenna Designmentioning

confidence: 99%

Numerical Analysis of MIM-Based Log-Spiral Rectennas for Efficient Infrared Energy Harvesting

Yahyaoui

Elsharabasy

Yousaf

et al. 2020

Sensors

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show abstract

“…Dimensions were modified to obtain the optimizations, at that moment aluminum was used as a radiating element and ground plane, obtaining results closer to reality. The log spiral antenna was based on the equations contained in [9,10] and can be observed in works such as [11]. The same methodology as the previous antenna was used for the design of this, shown in the Fig.…”

Section: Methodsmentioning

confidence: 99%

Antennas Comparison Applied to Detect Partial Discharges Coupled via Dielectric Window and Oil Valve in Power Transformers

Souza¹,

Freire²,

Nobrega³

et al. 2022

Proceedings of the 25th IMEKO TC4 International Symposium and 23rd International Workshop on ADC and DAC Modelling and Testing

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Considering increasing the reliability of electrical systems, continuous equipment maintenance is essential, thus ensuring longevity and avoiding failures that can cause irreparable damage to the equipment. Partial discharges are physical phenomena that cause short circuits in power equipment. There are techniques that use the detection of partial discharges as a condition monitoring techniques for electrical equipment. One of these techniques is the detection of partial discharges in power transformers by means of antennas. Thus, different antennas were analyzed for different coupling to the sensor into the high voltage equipment, either via dielectric window or oil valve. In comparison, the L-probe antenna obtained the best result, at −10 dB, while at −5 dB the log spiral performed better, for insertion via the dielectric window. For coupling via oil valve, the monopole obtained the best result, at −10 dB, considering the bandwidth at −5 dB the conical 70 mm did better.

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“…The ordinary feeding structure for planar spiral antennas is located in the middle of the spiral and expanded into the third dimension. 3,4,[6][7][8][9][10] The vertical impedance transformer (balun) always has an essentially long length and contributes to the high profile antenna and causes problems in the assembly of the antenna. 11 Additionally, it makes the antenna structure nonplanar, complex, and large size, 12 conflicting with the requirements of the low-profile geometry which makes the entire antenna voluminous.…”

Section: Introductionmentioning

confidence: 99%

“…Because of the balanced configuration of the Archimedean spiral antennas, feeding the antenna from a coaxial line might involve a broadband balun that is one of the major challenges in the design of the Archimedean spiral antenna. The ordinary feeding structure for planar spiral antennas is located in the middle of the spiral and expanded into the third dimension 3,4,6‐10 . The vertical impedance transformer (balun) always has an essentially long length and contributes to the high profile antenna and causes problems in the assembly of the antenna 11 .…”

Section: Introductionmentioning

confidence: 99%

Fully planar frequency independent square Archimedean spiral antenna with impedance transformer for ground penetrating radars

Bousbaa

Medkour

Bouttout

et al. 2020

Micro & Optical Tech Letters

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An ultra-wideband unidirectional circularly polarized planar self-complementary and compact Archimedean square spiral antenna is proposed in this paper. Compared to the conventional center-fed or verticallyconnected coaxial line spiral antennas, the proposed antenna has a completely planar feed structure. The traditional impedance transformer (balun) in the third dimension is moved to the planar plane based on a wideband microstrip line to coplanar stripline transition to realize a completely planar spiral antenna. This impedance transformer is integrated with the spiral antenna to achieve a planar structure and to adapt the impedance into a conventional 50 Ω coaxial cable. The performance of the proposed antenna is simulated and measured. The proposed antenna has a compact size of 90 × 90 × 1.6 mm 3 on an FR4 substrate and can yield a large −10 dB impedance bandwidth ranging from 2.14 to 9.8 GHz which is equivalent to a fractional bandwidth of 102.13% with unidirectional radiation patterns. The VSWR is less than two in the operating bandwidth and the axial ratio (AR) is less than 3 dB in the frequency range of 1-8 GHz. The simulated radiation efficiency ranges between 20% and 80%. The characteristics of the proposed antenna make it suitable for ground-penetrating radar applications and many others.

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Design of high return loss logarithmic spiral antenna

Abstract: We propose a new strategy for designing a logarithmic spiral antenna and the impedance adapter to operate in a frequency range of 1 to 10 GHz. Numerical and experimental results show a decrease in return loss being higher than 20 dB in almost the entire range of operation.

Cited by 8 publications

References 20 publications

Numerical Analysis of MIM-Based Log-Spiral Rectennas for Efficient Infrared Energy Harvesting

Numerical Analysis of MIM-Based Log-Spiral Rectennas for Efficient Infrared Energy Harvesting

Antennas Comparison Applied to Detect Partial Discharges Coupled via Dielectric Window and Oil Valve in Power Transformers

Fully planar frequency independent square Archimedean spiral antenna with impedance transformer for ground penetrating radars

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