Investigating Equations Used to Design a Very Small Normal-Mode Helical Antenna in Free Space
A normal-mode helical antenna (NMHA) has been applied in some small devices such as tire pressure monitoring systems (TPMS) and radio frequency identification (RFID) tags. Previously, electrical characteristics of NMHA were obtained through electromagnetic simulations. In practical design of NMHA, e...
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| Format: | Article |
| Language: | English |
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Wiley
2018-01-01
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| Series: | International Journal of Antennas and Propagation |
| Online Access: | http://dx.doi.org/10.1155/2018/7967468 |
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| author | Dang Tien Dung Quoc Dinh Nguyen Do Quoc Trinh Yoshihide Yamada |
| author_facet | Dang Tien Dung Quoc Dinh Nguyen Do Quoc Trinh Yoshihide Yamada |
| author_sort | Dang Tien Dung |
| collection | DOAJ |
| description | A normal-mode helical antenna (NMHA) has been applied in some small devices such as tire pressure monitoring systems (TPMS) and radio frequency identification (RFID) tags. Previously, electrical characteristics of NMHA were obtained through electromagnetic simulations. In practical design of NMHA, equational expressions for the main electrical characteristics are more convenient. Electrical performances of NMHA can be expressed by a combination of a short dipole and small loops. Applicability of equations for a short dipole and a small loop to very small normal-mode helical antennas such as antennas around 1/100 wavelengths was not clear. In this paper, accuracies of equations for input resistances, antenna efficiency, and axial ratios are verified by comparisons with electromagnetic simulation results by FEKO software at 402 MHz. In addition, the structure of the antenna equal to 0.021 λ is fabricated, and measurements are performed to confirm the design accuracy. |
| format | Article |
| id | doaj-art-2e77a2ee69444c3c93e7ca5acdf092f8 |
| institution | Kabale University |
| issn | 1687-5869 1687-5877 |
| language | English |
| publishDate | 2018-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Antennas and Propagation |
| spelling | doaj-art-2e77a2ee69444c3c93e7ca5acdf092f82025-02-03T01:26:18ZengWileyInternational Journal of Antennas and Propagation1687-58691687-58772018-01-01201810.1155/2018/79674687967468Investigating Equations Used to Design a Very Small Normal-Mode Helical Antenna in Free SpaceDang Tien Dung0Quoc Dinh Nguyen1Do Quoc Trinh2Yoshihide Yamada3Faculty of Radio-Electronics, Le Quy Don Technical University, Hanoi, VietnamFaculty of Radio-Electronics, Le Quy Don Technical University, Hanoi, VietnamFaculty of Radio-Electronics, Le Quy Don Technical University, Hanoi, VietnamMalaysia-Japan International Institute of Technology, Universiti Teknologi Malaysia, Kuala Lumpur, MalaysiaA normal-mode helical antenna (NMHA) has been applied in some small devices such as tire pressure monitoring systems (TPMS) and radio frequency identification (RFID) tags. Previously, electrical characteristics of NMHA were obtained through electromagnetic simulations. In practical design of NMHA, equational expressions for the main electrical characteristics are more convenient. Electrical performances of NMHA can be expressed by a combination of a short dipole and small loops. Applicability of equations for a short dipole and a small loop to very small normal-mode helical antennas such as antennas around 1/100 wavelengths was not clear. In this paper, accuracies of equations for input resistances, antenna efficiency, and axial ratios are verified by comparisons with electromagnetic simulation results by FEKO software at 402 MHz. In addition, the structure of the antenna equal to 0.021 λ is fabricated, and measurements are performed to confirm the design accuracy.http://dx.doi.org/10.1155/2018/7967468 |
| spellingShingle | Dang Tien Dung Quoc Dinh Nguyen Do Quoc Trinh Yoshihide Yamada Investigating Equations Used to Design a Very Small Normal-Mode Helical Antenna in Free Space International Journal of Antennas and Propagation |
| title | Investigating Equations Used to Design a Very Small Normal-Mode Helical Antenna in Free Space |
| title_full | Investigating Equations Used to Design a Very Small Normal-Mode Helical Antenna in Free Space |
| title_fullStr | Investigating Equations Used to Design a Very Small Normal-Mode Helical Antenna in Free Space |
| title_full_unstemmed | Investigating Equations Used to Design a Very Small Normal-Mode Helical Antenna in Free Space |
| title_short | Investigating Equations Used to Design a Very Small Normal-Mode Helical Antenna in Free Space |
| title_sort | investigating equations used to design a very small normal mode helical antenna in free space |
| url | http://dx.doi.org/10.1155/2018/7967468 |
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