Design of Single Feed, Dual-Band Circularly Polarized Quad-Mode Slot Antenna Using Coupled Mode Theory
In this article, a dual-band, dual-sense circularly polarized (CP) rectangular slot antenna with folded slots, fed by a microstrip line, is presented for GPS applications at 1575.4 MHz (L1) and 1227.5 MHz (L2). The excitation of the rectangular slot antenna maintains a small frequency ratio by gener...
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IEEE
2025-01-01
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| Series: | IEEE Access |
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| Online Access: | https://ieeexplore.ieee.org/document/10840195/ |
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| author | Mekaladevi V Natarajamani S |
| author_facet | Mekaladevi V Natarajamani S |
| author_sort | Mekaladevi V |
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| description | In this article, a dual-band, dual-sense circularly polarized (CP) rectangular slot antenna with folded slots, fed by a microstrip line, is presented for GPS applications at 1575.4 MHz (L1) and 1227.5 MHz (L2). The excitation of the rectangular slot antenna maintains a small frequency ratio by generating two modes at closely spaced frequencies through characteristic mode analysis (CMA) and coupling mode theory (CMT). Dual circular polarization is then achieved by creating two orthogonal modes with respect to the fundamental modes by inserting two folded slots at angles of −45° and 45° relative to the tilted arm of the rectangular slot antenna. The proposed antenna has <inline-formula> <tex-math notation="LaTeX">$100\times 100\times 1.6$ </tex-math></inline-formula> mm3 dimensions and radiates right-hand CP (RHCP) in the L1 band and left-hand CP (LHCP) in the L2 band. The measured impedance bandwidth is 3.6 % (1615-1675 MHz) for L1 and 26.7 % (1055-1380 MHz) for L2. The axial ratio bandwidth (ARBW) is observed as 3.2 % (1565-1616 MHz) for L1 and 4.04 % (1212-1262 MHz) for L2, with a maximum gain of 4.1 dBic and 3.8 dBic, respectively. |
| format | Article |
| id | doaj-art-8192f7d69f544a2e87790a8b6172387d |
| institution | Kabale University |
| issn | 2169-3536 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Access |
| spelling | doaj-art-8192f7d69f544a2e87790a8b6172387d2025-01-29T00:00:44ZengIEEEIEEE Access2169-35362025-01-0113107581076610.1109/ACCESS.2025.352945810840195Design of Single Feed, Dual-Band Circularly Polarized Quad-Mode Slot Antenna Using Coupled Mode TheoryMekaladevi V0https://orcid.org/0009-0005-3463-1104Natarajamani S1https://orcid.org/0000-0001-7362-1500Department of Electronics and Communication Engineering, Amrita School of Engineering, Amrita Vishwa Vidyapeetham, Coimbatore, IndiaDepartment of Electronics and Communication Engineering, Amrita School of Engineering, Amrita Vishwa Vidyapeetham, Coimbatore, IndiaIn this article, a dual-band, dual-sense circularly polarized (CP) rectangular slot antenna with folded slots, fed by a microstrip line, is presented for GPS applications at 1575.4 MHz (L1) and 1227.5 MHz (L2). The excitation of the rectangular slot antenna maintains a small frequency ratio by generating two modes at closely spaced frequencies through characteristic mode analysis (CMA) and coupling mode theory (CMT). Dual circular polarization is then achieved by creating two orthogonal modes with respect to the fundamental modes by inserting two folded slots at angles of −45° and 45° relative to the tilted arm of the rectangular slot antenna. The proposed antenna has <inline-formula> <tex-math notation="LaTeX">$100\times 100\times 1.6$ </tex-math></inline-formula> mm3 dimensions and radiates right-hand CP (RHCP) in the L1 band and left-hand CP (LHCP) in the L2 band. The measured impedance bandwidth is 3.6 % (1615-1675 MHz) for L1 and 26.7 % (1055-1380 MHz) for L2. The axial ratio bandwidth (ARBW) is observed as 3.2 % (1565-1616 MHz) for L1 and 4.04 % (1212-1262 MHz) for L2, with a maximum gain of 4.1 dBic and 3.8 dBic, respectively.https://ieeexplore.ieee.org/document/10840195/Characteristic mode analysis (CMA)circularly polarized (CP)coupled mode theory (CMT)dual-bandfolded slotsslot antenna |
| spellingShingle | Mekaladevi V Natarajamani S Design of Single Feed, Dual-Band Circularly Polarized Quad-Mode Slot Antenna Using Coupled Mode Theory IEEE Access Characteristic mode analysis (CMA) circularly polarized (CP) coupled mode theory (CMT) dual-band folded slots slot antenna |
| title | Design of Single Feed, Dual-Band Circularly Polarized Quad-Mode Slot Antenna Using Coupled Mode Theory |
| title_full | Design of Single Feed, Dual-Band Circularly Polarized Quad-Mode Slot Antenna Using Coupled Mode Theory |
| title_fullStr | Design of Single Feed, Dual-Band Circularly Polarized Quad-Mode Slot Antenna Using Coupled Mode Theory |
| title_full_unstemmed | Design of Single Feed, Dual-Band Circularly Polarized Quad-Mode Slot Antenna Using Coupled Mode Theory |
| title_short | Design of Single Feed, Dual-Band Circularly Polarized Quad-Mode Slot Antenna Using Coupled Mode Theory |
| title_sort | design of single feed dual band circularly polarized quad mode slot antenna using coupled mode theory |
| topic | Characteristic mode analysis (CMA) circularly polarized (CP) coupled mode theory (CMT) dual-band folded slots slot antenna |
| url | https://ieeexplore.ieee.org/document/10840195/ |
| work_keys_str_mv | AT mekaladeviv designofsinglefeeddualbandcircularlypolarizedquadmodeslotantennausingcoupledmodetheory AT natarajamanis designofsinglefeeddualbandcircularlypolarizedquadmodeslotantennausingcoupledmodetheory |