Improved spiral antenna with a new semi‐fractal reflector for short‐range sensing

Ranjbaran, Sayed Mohammad Husain; Mohanna, Shahram

doi:10.1049/iet-map.2018.0154

Cited by 11 publications

(13 citation statements)

References 23 publications

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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%

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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Section: Archimedean Spiral Antennamentioning

confidence: 99%

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

View full text Add to dashboard Cite

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“…and the reduction of antenna diameter [9]- [11]. In addition, the composite antenna is also an important miniaturization method, such as the equal angle helix and Archimedean spiral combined sky line, and the antenna terminal loading lumped resistance [12]- [14]. The realization of low profile is mainly achieved by adding absorbing materials to the reflector, using EBG (Electromagnetic Band Gap) structure as the reflector, special-shaped reflector and bending balun.…”

Section: Introductionmentioning

confidence: 99%

A Broadband Planar Spiral Antenna Design for Electromagnetic Signal Monitoring

Chen

2020

IEEE Access

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In order to meet the wide-band full-space radio monitoring task, the design of a circular-polarized planar dual-arm composite spiral antenna is presented in this paper. The antenna operation covers the L-band and S-band frequencies ranging from 200 MHz to 6 GHz (relative bandwidth is 187.1%). The equiangular spiral is applied to the beginning of the Archimedean spiral, which reduces the input impedance of the antenna, thereby reducing the length of the cross-section of the feed balun and realizing the miniaturization of antenna. The antenna is designed to be simple in structure and small in size. The diameter of the radiating surface and the length of the section are only 1/5 and 1/50 of the working wavelength. The simulated and measured results show that the antenna has a very good impedance matching (standing wave ratio of less than 2.5), and the antenna has good symmetry, and has good circular polarization and wideband characteristics. Finally, the antenna is applied with an USRP (universal software radio peripheral) to carry out the electromagnetic signal monitoring experiment outdoors. The results show that the designed antenna can receive electromagnetic signals in the 200 MHz-6 GHz band and can be used for full-space radio monitoring. INDEX TERMS Circular polarization, low profile, miniaturization, planar helical antenna, ultra-wideband.

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“…The 3-dB AR bandwidth was from 1.63 to 10 GHz, and the overall size of the antenna was 0.348λ 1.63 GHz × 0.206λ 1.63 GHz (diameter × height). In [13], a spiral antenna using a semifractal reflector and a combination of the equiangular Archimedean lines and a meander line was designed to obtain a 3-dB AR bandwidth of 0.9-4.37 GHz. The overall size of the antenna was 0.3λ 0.9 GHz × 0.3λ 0.9 GHz × 0.15λ 0.9 GHz .…”

Section: Introductionmentioning

confidence: 99%

Bandwidth-Enhanced Circularly Polarized Spiral Antenna With Compact Size

Chen¹,

Chang²,

Chen³

et al. 2020

IEEE Access

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A compact circularly polarized (CP) spiral antenna with enhanced impedance and 3-dB axial ratio (AR) bandwidths that is fed by a tapered coax balun is presented. The antenna is composed of a two-arm nonself-complementarity planar equiangular spiral, a z-directional helix, absorbing material with a stepped cylindrical honeycomb structure, and a ground plane. The z-directional helix is used to extend the current path and to improve the impedance matching and AR in the low-frequency band. The coupling between the nonself-complementarity planar spiral arms is increased, which improves the impedance matching in the low-frequency band and the AR at approximately 5.55 GHz. The stepped cylindrical absorbing material can reduce the reverse current and improve the AR in the high-frequency band. The measured results show that the impedance bandwidth and 3-dB AR bandwidths range from 0.5 to 6 GHz and from 0.5 to 5.8 GHz, respectively. The overall size of the proposed antenna is 0.189λ L × 0.065λ L (diameter × height, where λ L is the free-space wavelength at the starting frequency). INDEX TERMS Spiral antenna, absorbing material, ultrawideband, miniaturization.

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Improved spiral antenna with a new semi‐fractal reflector for short‐range sensing

Cited by 11 publications

References 23 publications

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

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

A Broadband Planar Spiral Antenna Design for Electromagnetic Signal Monitoring

Bandwidth-Enhanced Circularly Polarized Spiral Antenna With Compact Size

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