Compact Slot Antenna Integrated with a Photovoltaic Cell

Ahmed, A. Razzaque; Wang, Heesu; Yun, Yeojun; Lee, Jaejin

doi:10.26866/jees.2020.20.4.248

Cited by 16 publications

(8 citation statements)

References 18 publications

(17 reference statements)

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“…The antenna was excited at the centre of the slot using the well-known aperturecoupled patch antenna technique [21,22]. This is beneficial for the proposed textile-based antenna given that there is no need to penetrate the flexible neoprene substrate using a metallic pin for excitation.…”

Section: Design Structurementioning

confidence: 99%

“…This is beneficial for the proposed textile-based antenna given that there is no need to penetrate the flexible neoprene substrate using a metallic pin for excitation. Traditional aperture-coupled antennas are fed by a slot at the bottom ground with an additional feeding layer [21,22]. In contrast, the proposed design is fed by placing the cable on the radiating patch, which reduces the backward radiation and promote better tunability of dual-band resonances.…”

Section: Design Structurementioning

confidence: 99%

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An All-Textile Dual-Band Antenna for BLE and LoRa Wireless Communications

et al. 2021

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In this paper, a dual-band conductive textile-based wearable antenna operating at LoRa-868 MHz and BLE-2.4 GHz is presented. The proposed antenna is intended for accurate geolocation, tracking and communication applications in the military, industrial and telemedicine industries. The low-profile patch antenna is suitable for integrating into clothing. It is composed of three textile layers: top and bottom silver-ink-printed polystyrene fabrics, and a neoprene substrate. To utilize the flexible and restorable properties of these textile materials, the proposed antenna is directly fed by a flexible cable using an aperture-coupled feeding technique. This method not only eliminates the use of the conventional, bulky, and metallic SMA connector but also introduces a secondary resonance at 2.4 GHz, enabling the dual-band property. Using a thin coaxial cable fixed on the aperture slot for proximity coupling, a compact antenna size of 150 mm2 is obtained that can easily be attached and detached on existing cloths. The proposed structure has been fabricated and measured in an anechoic chamber to verify the performance. Measured gain of 3.28 dBi and 3.25 dBi was realized for LoRa and BLE at an antenna size of 0.61 λg × 0.61 λg × 0.012 λg (where λg is guided wavelength at 868 MHz) with a front-to-back ratio (FBR) of greater than 10 dBi.

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Section: Design Structurementioning

confidence: 99%

Section: Design Structurementioning

confidence: 99%

An All-Textile Dual-Band Antenna for BLE and LoRa Wireless Communications

et al. 2021

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“…Furthermore, the PV cell should have maximum exposure to light for optimal efficiency. In our previous work, an initial investigation was performed to address these challenges, and a rectangular-slot-based PV cell was proposed with an integrated antenna in the 5.8 GHz band [29], [30]. The focus of the present work is to design a lowprofile and compact PV-cell-integrated antenna for 2.45 GHz applications using a hexagonal-shaped slot.…”

Section: Introductionmentioning

confidence: 99%

Photovoltaic Cell With Built-In Antenna for Internet of Things Applications

et al. 2021

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A compact and low-profile photovoltaic (PV) cell with a built-in antenna is proposed for Internet of Things (IoT) applications. The proposed design exploits the gallium arsenide (GaAs)-based PV cell for antenna operation; for this purpose, a hexagonal slot with a trapezoidal perturbation is cut from the active area and bottom contact of the PV cell for resonance. The bottom contact of the PV cell is also used as the ground plane for the antenna. An AC blocking circuit is designed to prevent the flow of RF current toward the PV cell, and a chip inductor is used as an RF choke in the circuit. Thus, a single device simultaneously functions as a PV cell and an antenna. The GaAs PV cell shows a power conversion efficiency (PCE) of 13.25% without antireflection coating, with an open-circuit voltage (Voc), a shortcircuit current density (Jsc), and a fill factor (FF) of 0.963 V, 21.00 mA/cm 2 , and 65.52%, respectively. Furthermore, the optical transparency of the proposed PV-cell antenna is greater than 90%. The complete structure occupies an overall volume of 31.4 mm × 33 mm × 0.639 mm (0.25λo × 0.26λo × 0.0052λo at 2.45 GHz), and the antenna operates in the range of 2.14 to 2.94 GHz, with a gain of 2.8 dBi at 2.45 GHz.INDEX TERMS Compact antenna, integrated antenna, IoT devices, photovoltaic (PV) cell, slot antenna.

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“…The idea of integrating solar cells with antennas dates to the 1990s for space applications 10 . Afterward, different methods and techniques have been presented to integrate solar cells with an antenna 11 – 18 .…”

Section: Introductionmentioning

confidence: 99%

Ultra-low profile solar-cell-integrated antenna with a high form factor

Ahmed

Wang

Lee

et al. 2021

Sci Rep

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This paper presents an ultra-low-profile copper indium gallium selenide (CIGS) based solar cell integrated antenna with a high form factor. A tiny slot was etched from the solar cell to develop an ultra-low-profile solar-cell-integrated antenna. This tiny slot increases the form factor due to the small clearance area from the solar cell. A ground-radiation antenna design method was applied in which lumped elements were employed inside the tiny slot for antenna operation. Another substrate was used under the solar cell for designing the feeding structure with lumped elements connected to the tiny slot using via holes. A prototype was fabricated and measured to verify the operation of a built-in solar-cell antenna and validate the simulated results. The measured results demonstrate that the solar-cell-integrated antenna covers the entire frequency range of the Industrial Scientific Medical band, from 2.4 to 2.5 GHz, with a maximum gain of 2.79 dBi and radiation efficiency higher than 80% within the impedance bandwidth range. Moreover, the proposed design has an ultra-low-profile structure of only 0.0046 λo, where λo represents the free space wavelength at 2.45 GHz, and a high form factor of 99.1% with no optical blockage. The antenna and solar cell were designed to avoid affecting the performance of each other using the radio-frequency decoupler.

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Compact Slot Antenna Integrated with a Photovoltaic Cell

Cited by 16 publications

References 18 publications

An All-Textile Dual-Band Antenna for BLE and LoRa Wireless Communications

An All-Textile Dual-Band Antenna for BLE and LoRa Wireless Communications

Photovoltaic Cell With Built-In Antenna for Internet of Things Applications

Ultra-low profile solar-cell-integrated antenna with a high form factor

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