Narrow-Beam Antenna for Short-Distance Non-Destructive Sensor in Fruit-Ripeness Monitoring
Radiation pattern subtraction is a useful technique for narrowing a receiving antenna's radiation pattern in a short-distance, non-destructive sensor. The sensor's antenna was developed to be compact and light-weight as well as to operate in real-time. This work applied the principle of ra...
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doaj-e31a668f4c994b5faf72ad06f7cec0a22021-03-30T04:44:12ZengIEEEIEEE Access2169-35362020-01-01822614222615010.1109/ACCESS.2020.30449089294140Narrow-Beam Antenna for Short-Distance Non-Destructive Sensor in Fruit-Ripeness MonitoringHoang Nam Dao0https://orcid.org/0000-0001-9309-4015Chuwong Phongcharoenpanich1https://orcid.org/0000-0002-2057-3127Monai Krairiksh2https://orcid.org/0000-0002-6503-2500Department of Telecommunications Engineering, School of Engineering, King Mongkut’s Institute of Technology Ladkrabang, Bangkok, ThailandDepartment of Telecommunications Engineering, School of Engineering, King Mongkut’s Institute of Technology Ladkrabang, Bangkok, ThailandDepartment of Telecommunications Engineering, School of Engineering, King Mongkut’s Institute of Technology Ladkrabang, Bangkok, ThailandRadiation pattern subtraction is a useful technique for narrowing a receiving antenna's radiation pattern in a short-distance, non-destructive sensor. The sensor's antenna was developed to be compact and light-weight as well as to operate in real-time. This work applied the principle of radiation pattern subtraction to narrow the beamwidth of an antenna. Our experimental data demonstrated that a simple narrow-beam three-element antenna with a 35° half-power beamwidth and a small size of 5.9 × 6.5 cm<sup>2</sup> could be realized. In the experiment, the radiation pattern of an array antenna (consisting of two halfwave dipoles with a reflector) was subtracted from the radiation pattern of an element antenna (consisting of a halfwave dipole with a reflector) for the three-element antenna to achieve a narrow beamwidth and compact size. The antenna had a simple feeding network that operated at 10.525 GHz and 35° half-power beamwidth. The angular resolution of the receiving antenna was tested with mango fruits: it was able to resolve an 80 mm separation between the fruit of interest and the nearby fruit, which was sufficient, in terms of practicality, for mitigating the interfering effect of nearby fruits to the fruit of interest. This type of antenna is useful as a short-distance, non-destructive sensor such as a pre-harvest sensor.https://ieeexplore.ieee.org/document/9294140/Pre-harvest sensorshort-distancenon-destructive sensorangular resolution improvementradiation pattern subtractiondipole array |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Hoang Nam Dao Chuwong Phongcharoenpanich Monai Krairiksh |
spellingShingle |
Hoang Nam Dao Chuwong Phongcharoenpanich Monai Krairiksh Narrow-Beam Antenna for Short-Distance Non-Destructive Sensor in Fruit-Ripeness Monitoring IEEE Access Pre-harvest sensor short-distance non-destructive sensor angular resolution improvement radiation pattern subtraction dipole array |
author_facet |
Hoang Nam Dao Chuwong Phongcharoenpanich Monai Krairiksh |
author_sort |
Hoang Nam Dao |
title |
Narrow-Beam Antenna for Short-Distance Non-Destructive Sensor in Fruit-Ripeness Monitoring |
title_short |
Narrow-Beam Antenna for Short-Distance Non-Destructive Sensor in Fruit-Ripeness Monitoring |
title_full |
Narrow-Beam Antenna for Short-Distance Non-Destructive Sensor in Fruit-Ripeness Monitoring |
title_fullStr |
Narrow-Beam Antenna for Short-Distance Non-Destructive Sensor in Fruit-Ripeness Monitoring |
title_full_unstemmed |
Narrow-Beam Antenna for Short-Distance Non-Destructive Sensor in Fruit-Ripeness Monitoring |
title_sort |
narrow-beam antenna for short-distance non-destructive sensor in fruit-ripeness monitoring |
publisher |
IEEE |
series |
IEEE Access |
issn |
2169-3536 |
publishDate |
2020-01-01 |
description |
Radiation pattern subtraction is a useful technique for narrowing a receiving antenna's radiation pattern in a short-distance, non-destructive sensor. The sensor's antenna was developed to be compact and light-weight as well as to operate in real-time. This work applied the principle of radiation pattern subtraction to narrow the beamwidth of an antenna. Our experimental data demonstrated that a simple narrow-beam three-element antenna with a 35° half-power beamwidth and a small size of 5.9 × 6.5 cm<sup>2</sup> could be realized. In the experiment, the radiation pattern of an array antenna (consisting of two halfwave dipoles with a reflector) was subtracted from the radiation pattern of an element antenna (consisting of a halfwave dipole with a reflector) for the three-element antenna to achieve a narrow beamwidth and compact size. The antenna had a simple feeding network that operated at 10.525 GHz and 35° half-power beamwidth. The angular resolution of the receiving antenna was tested with mango fruits: it was able to resolve an 80 mm separation between the fruit of interest and the nearby fruit, which was sufficient, in terms of practicality, for mitigating the interfering effect of nearby fruits to the fruit of interest. This type of antenna is useful as a short-distance, non-destructive sensor such as a pre-harvest sensor. |
topic |
Pre-harvest sensor short-distance non-destructive sensor angular resolution improvement radiation pattern subtraction dipole array |
url |
https://ieeexplore.ieee.org/document/9294140/ |
work_keys_str_mv |
AT hoangnamdao narrowbeamantennaforshortdistancenondestructivesensorinfruitripenessmonitoring AT chuwongphongcharoenpanich narrowbeamantennaforshortdistancenondestructivesensorinfruitripenessmonitoring AT monaikrairiksh narrowbeamantennaforshortdistancenondestructivesensorinfruitripenessmonitoring |
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