A miniaturized ultrawideband Archimedean spiral antenna for low‐power sensor applications in energy harvesting

Alex‐Amor, Antonio; Padilla, Pablo; Fernández-González, José-Manuel; Silva, Manuel

doi:10.1002/mop.31534

Cited by 11 publications

(14 citation statements)

References 14 publications

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“…It is obvious that the proposed antenna has design superiority over many designs in terms of compactness and bandwidth for the designed frequency bands. Compared to results reported by Alex-Amor et al [4], impedance bandwidth of the antenna is reduced that it is because of reduction in the total area of the proposed antenna. The proposed wideband antenna is developed to array configuration based on a microstrip-to-slot-line transition feeding network in literature [22].…”

Section: Antenna Fabrication and Measurement Resultscontrasting

confidence: 61%

“…In the last decade, ranges of antenna for energy harvesting applications have been proposed such as patch antenna [3], spiral antenna [4], dipole antenna [5], slot antenna [6], metamaterial antenna [7], and so on. These antenna designs have narrowband [5,8], multiband [9,10], or wideband [1][2][3][4][11][12][13][14] operations. A single narrow band design produces low conversion efficiency for low-power levels of input power density and not very proper for wireless energy scavenging applications.…”

Section: Introductionmentioning

confidence: 99%

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A Wideband Fractal Planar Monopole Antenna with a Thin Slot on Radiating Stub for Radio Frequency Energy Harvesting Applications

Fakharian

2020

IJE

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In this paper, for energy harvesting applications a design of a wideband planar monopole antenna is proposed using fractal geometry and inserting a thin slot on radiation patch. The proposed antenna is optimized at various stages during its design. Moreover, a parametric study is done for understanding sensitivity of important design parameters in the design process of the antenna. The designed antenna operates at 10-dB impedance bandwidth from 0.92 to 2.58 GHz (fractional bandwidth of 95%) with low profile structure and compact size of 65 × 65 × 0.8 mm 3 , acceptable return losses, stable radiation characterizes and reasonable gains. A potential application of the antenna as a receiving antenna for harvesting systems has been carried out inside the laboratory as the harvested power from ambient radiofrequency (RF) energy. This wideband antenna has a good potential to harvest RF energy of available signals in the GSM-900, GSM-1800, and Wi-Fi bands, and can be used as a part in DC power supply modules of low power sensor networks.

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Section: Antenna Fabrication and Measurement Resultscontrasting

confidence: 61%

Section: Introductionmentioning

confidence: 99%

A Wideband Fractal Planar Monopole Antenna with a Thin Slot on Radiating Stub for Radio Frequency Energy Harvesting Applications

Fakharian

2020

IJE

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“…Their constant impedance along the frequency facilitates the design of the multiplier circuit, since the circuit dependence on the antenna impedance is eliminated. The two spiral-shape antennas most typically used in practice are the Archimedean spiral [11,16] and the equiangular spiral [17], both circularly polarized. The design of the harvesting element will be based on the Archimedean spiral antenna due to its simpler geometry.…”

Section: Archimedean Spiral Antennamentioning

confidence: 99%

“…In our design (Figure 3), we simply propose extending the arms of the spiral in a straight line to the end of the antenna. The studies carried out in [11] demonstrate that it is preferable to put an impedance step in the center of the arm extension. Thus, current reflections are softened, and a higher bandwidth can be reached.…”

Section: Archimedean Spiral Antennamentioning

confidence: 99%

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RF Energy Harvesting System Based on an Archimedean Spiral Antenna for Low-Power Sensor Applications

Alex‐Amor

Palomares‐Caballero

Fernández-González

et al. 2019

Sensors

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This paper presents a radiofrequency (RF) energy harvesting system based on an ultrawideband Archimedean spiral antenna and a half-wave Cockcroft-Walton multiplier circuit. The antenna was proved to operate from 350 MHz to 16 GHz with an outstanding performance. With its use, radio spectrum measurements were carried out at the Telecommunication Engineering School (Universidad Politécnica de Madrid) to determine the power level of the ambient signals in two different scenarios: indoors and outdoors. Based on these measurements, a Cockcroft-Walton multiplier and a lumped element matching network are designed to operate at 800 MHz and 900 MHz frequency bands. To correct the frequency displacement in the circuit, a circuit model is presented that takes into account the different parasitic elements of the components and the PCB. With an input power of 0 dBm, the manufactured circuit shows a rectifying efficiency of 30%. Finally, a test is carried out with the full RF energy harvesting system to check its correct operation. Thus, the RF system is placed in front of a transmitting Vivaldi antenna at a distance of 50 cm. The storage capacitor has a charge of over 1.25 V, which is enough to run a temperature sensor placed as the load to be supplied. This demonstrates the validity of the RF energy harvesting system for low-power practical applications.

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Compact multiple cut‐corners square spiral antenna for stepped‐frequency continuous wave radar system

Tong

Jin

et al. 2019

Micro & Optical Tech Letters

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Stepped frequency continuous wave (SFCW) radar is a promising noncontact method to detection of human vital signs. Antenna as a key component of radar directly related to the performance of the radar. In this letter, we present a 0.5‐1.2 GHz compact multiple cut‐corners square spiral antenna for SFCW radar system. Compared with conventional planar spiral antennas, the improved antenna possesses the advantages of miniaturization and excellent axial ratio. The gradient‐change of the cut‐corners along the radiation determines its operation range: large cut‐corner corresponds to high frequency, while small cut‐corner affects low frequency. This design successfully leads to a small geometric size of 0.282 × 0.282 × 0.133 m. We measured this improved antenna in an anechoic chamber, and the results demonstrated that the circular polarization bandwidth for axial ratio ≤3 dB approached 100%, and a right‐hand circularly polarization (RHCP) gain of 4‐8.98 dBic in end‐fire direction is achieved in its operational range. Finally, we designed the experiment, experimental results show that the proposed antenna can work well with the SFCW radar in the detection of human vital sign (respiratory signals), indicating a great potential for detected life in practice.

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A miniaturized ultrawideband Archimedean spiral antenna for low‐power sensor applications in energy harvesting

Cited by 11 publications

References 14 publications

A Wideband Fractal Planar Monopole Antenna with a Thin Slot on Radiating Stub for Radio Frequency Energy Harvesting Applications

A Wideband Fractal Planar Monopole Antenna with a Thin Slot on Radiating Stub for Radio Frequency Energy Harvesting Applications

RF Energy Harvesting System Based on an Archimedean Spiral Antenna for Low-Power Sensor Applications

Compact multiple cut‐corners square spiral antenna for stepped‐frequency continuous wave radar system

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