Broadband ESPAR antenna using sleeve wires

Liang, Qiuyan; Sun, Baohua; Zhou, Gaonan; Li, Jianfeng

doi:10.1002/mmce.21410

Cited by 8 publications

(5 citation statements)

References 13 publications

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“…In addition, interference is a major obstacle to obtaining peak performance of the sensor networks [ 8 , 9 , 10 ] because the interference is exhibited within the network due to multipath fading or reflections which strongly affects the signal strength received by the radio frequency identification (RFID) reader antenna [ 11 , 12 , 13 ]. Likewise, the WSN system’s performance could degrade due to the minimum value of the signal-to-interference ratio (SIR) or the signal-to-interference and noise ratio (SINR) [ 14 , 15 ]. The probability of an outage or a lower level wireless connection is very high within the sensor networks for the inferior values of SIR or SNR [ 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

IoT Sensor Network Using ESPAR Antenna Based on Beam Scanning Method for Direction Finding

Rahman

Ryu

2022

Sensors

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Wireless sensor networks (WSNs) systems based on Internet of Things (IoT) have developed rapidly in recent years. However, interference is a major obstacle to relatively long-distance communications in such networks. It is also very complicated and challenging to fix the exact location of tags in the IoT sensor networks. To overcome these problems, in this paper, an electronic steering parasitic array radiator (ESPAR) antenna used as a beamformer to handle the interference and extend the communication range from the sensors or tags is suggested. In addition, an efficient method, namely beam scanning (BS), is proposed to find the directions of tags. The beam scanning method (BSM) can be used for the selective beam switching (SBS) system by designing an ESPAR or array of ESPAR antennas with the help of CST studio. The antennas exhibit higher gain (8.17 dBi, 11.40 dBi) and proper radiation pattern at a particular direction. In addition, the MATLAB simulation findings indicate that the proposed BSM algorithm provides longer communication range, i.e., 25 m. In order to maximize range while avoiding interference, it is necessary to determine the direction and precise orientation of the tag in the WSN communication systems. Consequently, this work could be applied to an IoT sensor network such as an electrocardiogram system by providing better advantages such as higher localization accuracy and longer operating range.

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Section: Introductionmentioning

confidence: 99%

IoT Sensor Network Using ESPAR Antenna Based on Beam Scanning Method for Direction Finding

Rahman

Ryu

2022

Sensors

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“…5–7 There are about more than 200 million people from developed and developing nations that are endemic for fluorosis, particularly in India, China, Pakistan, and Africa. 8 Therefore, eliminating fluoride from drinking water becomes a worldwide hot concern. Until now, there are a mass of proven defluoridation methods, namely, electrochemical separation, 9 electrodialysis, 10 precipitation, 11 ionic exchange, 12 adsorption, 13–17 and nanofiltration.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of stable flowerlike MgAl-LDH@MIL-88A and its adsorption performance for fluoride

Chen

Qin

et al. 2022

Journal of Chemical Research

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MgAl-LDH@MIL-88A as an effective adsorbent was successfully prepared by a simple stirring method in water bath through loading MIL-88A onto the surface of flowerlike MgAl-LDH, which was synthesized via solvothermal method. Interestingly, the results of characterizations showed that the MIL-88A could still grow, but extrude the brucite-like layers of MgAl-LDH. The influences of initial solution pH, contact time, temperature, and co-existing ions on the adsorption performance of MgAl-LDH@MIL-88A were studied systematically by batch static adsorption experiments. It was found that MgAl-LDH@MIL-88A represented the highest adsorption loading of fluoride (14.00 mg g−1) at initial pH 7.0 in 420 min. The uptake process was described appropriately by the pseudo-second-order, the Temkin and the Freundlich isotherm models. The thermodynamic parameters confirmed the endothermic and spontaneous nature of adsorption. MgAl-LDH@MIL-88A was the green adsorbent as the residual mental contents ([Mg2+] = 1.095 mg L−1, [Fe3+] = 0.007 mg L−1, [Al3+] = 0.076 mg L−1) after adsorption met the Chinese sanitary standard for drinking water (GB 5749-2006). The mechanism of fluoride removal by MgAl-LDH@MIL-88A involved the electrostatic interactions between Fe3+ of MIL-88A and fluoride, and ligand exchange among hydroxyl groups of MgAl-LDH, carboxylate groups of the C4H4O4 and fluoride.

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“…To support the high‐data rate of the wireless communication in public places with dense clients, the ability of processing the signal data in the full horizontal range is highly desirable for wireless local area network (WLAN) antenna systems. The electrically beam steerable antenna is a timing sequence sector antenna 4‐8 . However, the timing sequence sector antennas can only provide service to one sector at one time, which limits the system capacity.…”

Section: Introductionmentioning

confidence: 99%

A dual‐band shared‐aperture parasitic array radiator antenna for WLAN applications

Liang

Sun

Zhou

2021

Int J RF Microw Comput Aided Eng

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In this article, a dual‐band shared‐aperture parasitic array radiator (DS‐PAR) antenna is presented to cover 2.4‐GHz WLAN lower‐band (LB) and 5‐GHz wireless local area network (WLAN) higher‐band (HB). The proposed antenna uses parasitic elements shared by both frequency bands, thus achieving the shared aperture of the dual‐band array. The antenna comprises of active elements for two bands, shared parasitic elements, reflective plate, and ground plane. The shared parasitic elements have different functions in the two frequency bands. The reflection parasitic elements in HB can be used in LB to achieve impedance matching and optimize the half‐power beamwidth. With a rotational symmetric structure, the antenna can generate three beams in 2.4‐GHz LB and six beams in 5‐GHz HB in horizontal plane, which covers full 360° range in both bands without communication blind zone. To validate the proposed design, a prototype is fabricated and measured. With the shared reflective plates, the dual‐band antenna works well in a shared space with a diameter of 0.73 wavelength in free space at 2.45 GHz. The antenna exhibits good impedance matching and high‐port isolation higher than 20 dB over the 2.4‐ and 5‐GHz bands. The realized gain is 4.81, 5.37, 5.30 dBi at 2.45, 5.25, and 5.8 GHz, respectively. The envelope correlation is lower than −35 dB within the bands of interest.

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Broadband ESPAR antenna using sleeve wires

Cited by 8 publications

References 13 publications

IoT Sensor Network Using ESPAR Antenna Based on Beam Scanning Method for Direction Finding

IoT Sensor Network Using ESPAR Antenna Based on Beam Scanning Method for Direction Finding

Synthesis of stable flowerlike MgAl-LDH@MIL-88A and its adsorption performance for fluoride

A dual‐band shared‐aperture parasitic array radiator antenna for WLAN applications

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