Beamwidth-Reconfigurable Circularly Polarized Slot Antenna Based on Half-Mode Substrate-Integrated Waveguide
Beamwidth-reconfigurable antennas are useful for the intersatellite link of low earth orbit formation flying and constellation, as they prevent unauthorized satellites from eavesdropping. In this article, a circularly polarized slot array antenna based on a half-mode substrate-integrated waveguide (...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-01-01
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| Series: | Electronics |
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| Online Access: | https://www.mdpi.com/2079-9292/12/2/363 |
| _version_ | 1797443513584975872 |
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| author | Jeong-Hun Park Moon-Que Lee |
| author_facet | Jeong-Hun Park Moon-Que Lee |
| author_sort | Jeong-Hun Park |
| collection | DOAJ |
| description | Beamwidth-reconfigurable antennas are useful for the intersatellite link of low earth orbit formation flying and constellation, as they prevent unauthorized satellites from eavesdropping. In this article, a circularly polarized slot array antenna based on a half-mode substrate-integrated waveguide (HMSIW) for the K-band beamwidth reconfiguration is proposed using a new radio frequency (RF) switch structure and a pair of modified −45° and +45° linearly polarized HMSIW slot arrays for the dual operation of a single-pole double-throw (SPDT)/a power divider (PD) and easy integration with other components, respectively. The RF switch structure consists of a T-junction PD, <i>λ</i>/4 lines, and beam lead PIN diodes with current control resistors and without a DC block circuit for low DC power consumption and size reduction. The −45°/+45° linearly polarized HMSIW slot arrays providing linear and circular polarizations (LP and CP, respectively) are operated for CP. The use of a short-circuited termination instead of dissipative termination results in easier integration with other components because the 16 radiating slots consume most of the input power. The dimension of the beamwidth-reconfigurable antenna including the bottom metal layer is 157.2 × 23.3 × 0.254 mm<sup>3</sup> (12.5<i>λ</i><sub>0</sub> × 1.86<i>λ</i><sub>0</sub> × 0.0202<i>λ</i><sub>0</sub>). The RF switch for the SPDT shows the insertion losses of 1.8–2.3 and 16.7–24.2 dB and an isolation of 20.9–33.4 dB for both outputs within the 10-dB bandwidth. The RF switch for the PD has an insertion loss of 3.9–4.8 dB. The one- and two-antenna operation modes of the CP antenna provide the gains of 9.44 and 6.99 dBic, the axial ratios of 2.24 and 3.47 dB, and the horizontal beamwidths of 35.8° and 78.2°, respectively. |
| first_indexed | 2024-03-09T12:57:10Z |
| format | Article |
| id | doaj.art-adb81d50267540ba8ae48f316e6fba2d |
| institution | Directory Open Access Journal |
| issn | 2079-9292 |
| language | English |
| last_indexed | 2024-03-09T12:57:10Z |
| publishDate | 2023-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Electronics |
| spelling | doaj.art-adb81d50267540ba8ae48f316e6fba2d2023-11-30T21:59:26ZengMDPI AGElectronics2079-92922023-01-0112236310.3390/electronics12020363Beamwidth-Reconfigurable Circularly Polarized Slot Antenna Based on Half-Mode Substrate-Integrated WaveguideJeong-Hun Park0Moon-Que Lee1School of Electrical and Computer Engineering, University of Seoul, 163 Siripdae-ro, Dongdaemun-gu, Seoul 02504, Republic of KoreaSchool of Electrical and Computer Engineering, University of Seoul, 163 Siripdae-ro, Dongdaemun-gu, Seoul 02504, Republic of KoreaBeamwidth-reconfigurable antennas are useful for the intersatellite link of low earth orbit formation flying and constellation, as they prevent unauthorized satellites from eavesdropping. In this article, a circularly polarized slot array antenna based on a half-mode substrate-integrated waveguide (HMSIW) for the K-band beamwidth reconfiguration is proposed using a new radio frequency (RF) switch structure and a pair of modified −45° and +45° linearly polarized HMSIW slot arrays for the dual operation of a single-pole double-throw (SPDT)/a power divider (PD) and easy integration with other components, respectively. The RF switch structure consists of a T-junction PD, <i>λ</i>/4 lines, and beam lead PIN diodes with current control resistors and without a DC block circuit for low DC power consumption and size reduction. The −45°/+45° linearly polarized HMSIW slot arrays providing linear and circular polarizations (LP and CP, respectively) are operated for CP. The use of a short-circuited termination instead of dissipative termination results in easier integration with other components because the 16 radiating slots consume most of the input power. The dimension of the beamwidth-reconfigurable antenna including the bottom metal layer is 157.2 × 23.3 × 0.254 mm<sup>3</sup> (12.5<i>λ</i><sub>0</sub> × 1.86<i>λ</i><sub>0</sub> × 0.0202<i>λ</i><sub>0</sub>). The RF switch for the SPDT shows the insertion losses of 1.8–2.3 and 16.7–24.2 dB and an isolation of 20.9–33.4 dB for both outputs within the 10-dB bandwidth. The RF switch for the PD has an insertion loss of 3.9–4.8 dB. The one- and two-antenna operation modes of the CP antenna provide the gains of 9.44 and 6.99 dBic, the axial ratios of 2.24 and 3.47 dB, and the horizontal beamwidths of 35.8° and 78.2°, respectively.https://www.mdpi.com/2079-9292/12/2/363beamwidth-reconfigurable antennahalf-mode substrate-integrated waveguide (HMSIW)single-pole double-throw (SPDT)power divider (PD) |
| spellingShingle | Jeong-Hun Park Moon-Que Lee Beamwidth-Reconfigurable Circularly Polarized Slot Antenna Based on Half-Mode Substrate-Integrated Waveguide Electronics beamwidth-reconfigurable antenna half-mode substrate-integrated waveguide (HMSIW) single-pole double-throw (SPDT) power divider (PD) |
| title | Beamwidth-Reconfigurable Circularly Polarized Slot Antenna Based on Half-Mode Substrate-Integrated Waveguide |
| title_full | Beamwidth-Reconfigurable Circularly Polarized Slot Antenna Based on Half-Mode Substrate-Integrated Waveguide |
| title_fullStr | Beamwidth-Reconfigurable Circularly Polarized Slot Antenna Based on Half-Mode Substrate-Integrated Waveguide |
| title_full_unstemmed | Beamwidth-Reconfigurable Circularly Polarized Slot Antenna Based on Half-Mode Substrate-Integrated Waveguide |
| title_short | Beamwidth-Reconfigurable Circularly Polarized Slot Antenna Based on Half-Mode Substrate-Integrated Waveguide |
| title_sort | beamwidth reconfigurable circularly polarized slot antenna based on half mode substrate integrated waveguide |
| topic | beamwidth-reconfigurable antenna half-mode substrate-integrated waveguide (HMSIW) single-pole double-throw (SPDT) power divider (PD) |
| url | https://www.mdpi.com/2079-9292/12/2/363 |
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