Design of a cavity backed spiral antenna with improved pattern symmetry
In this paper we investigate the azimuthal pattern symmetry of an Archimedean spiral antenna which is designed to operate over the frequency range 3-10 GHz. The performance of the spiral in free space is compared with a structure that is backed by a perfect electric conductor with a separation dista...
| Main Authors: | , , |
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| Format: | Proceeding Paper |
| Language: | English |
| Published: |
2013
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/45484/ http://irep.iium.edu.my/45484/1/45484.pdf |
| _version_ | 1848782797579223040 |
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| author | Mohamad, Sarah Yasmin Cahill, Robert Fusco, Vincent |
| author_facet | Mohamad, Sarah Yasmin Cahill, Robert Fusco, Vincent |
| author_sort | Mohamad, Sarah Yasmin |
| building | IIUM Repository |
| collection | Online Access |
| description | In this paper we investigate the azimuthal pattern symmetry of an Archimedean spiral antenna which is designed to operate over the frequency range 3-10 GHz. The performance of the spiral in free space is compared with a structure that is backed by a perfect electric conductor with a separation distance of λ/4 at the operating frequencies. The latter arrangement exhibits a higher gain, however it is observed that the radiation patterns are less symmetrical about boresight and this performance degradation increases with frequency. The predicted 3 dB beamwidth difference is shown to vary between 14° (3 GHz) and 51° (10 GHz). An improved antenna design is described which reduces the pattern asymmetry to ≈ 2° at 10 GHz. The reduction in modal contamination is obtained by inserting slots carefully arranged in a radial pattern to disrupt the surface currents that flow on the ground plane of the antenna. |
| first_indexed | 2025-11-14T16:11:10Z |
| format | Proceeding Paper |
| id | iium-45484 |
| institution | International Islamic University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T16:11:10Z |
| publishDate | 2013 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | iium-454842015-11-23T08:41:14Z http://irep.iium.edu.my/45484/ Design of a cavity backed spiral antenna with improved pattern symmetry Mohamad, Sarah Yasmin Cahill, Robert Fusco, Vincent TK5101 Telecommunication. Including telegraphy, radio, radar, television In this paper we investigate the azimuthal pattern symmetry of an Archimedean spiral antenna which is designed to operate over the frequency range 3-10 GHz. The performance of the spiral in free space is compared with a structure that is backed by a perfect electric conductor with a separation distance of λ/4 at the operating frequencies. The latter arrangement exhibits a higher gain, however it is observed that the radiation patterns are less symmetrical about boresight and this performance degradation increases with frequency. The predicted 3 dB beamwidth difference is shown to vary between 14° (3 GHz) and 51° (10 GHz). An improved antenna design is described which reduces the pattern asymmetry to ≈ 2° at 10 GHz. The reduction in modal contamination is obtained by inserting slots carefully arranged in a radial pattern to disrupt the surface currents that flow on the ground plane of the antenna. 2013 Proceeding Paper PeerReviewed application/pdf en http://irep.iium.edu.my/45484/1/45484.pdf Mohamad, Sarah Yasmin and Cahill, Robert and Fusco, Vincent (2013) Design of a cavity backed spiral antenna with improved pattern symmetry. In: 2013 7th European Conference on Antennas and Propagation (EuCAP), 8th-12th April 2013 , Gothenburg. http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=6547055&tag=1 |
| spellingShingle | TK5101 Telecommunication. Including telegraphy, radio, radar, television Mohamad, Sarah Yasmin Cahill, Robert Fusco, Vincent Design of a cavity backed spiral antenna with improved pattern symmetry |
| title | Design of a cavity backed spiral antenna with improved pattern symmetry |
| title_full | Design of a cavity backed spiral antenna with improved pattern symmetry |
| title_fullStr | Design of a cavity backed spiral antenna with improved pattern symmetry |
| title_full_unstemmed | Design of a cavity backed spiral antenna with improved pattern symmetry |
| title_short | Design of a cavity backed spiral antenna with improved pattern symmetry |
| title_sort | design of a cavity backed spiral antenna with improved pattern symmetry |
| topic | TK5101 Telecommunication. Including telegraphy, radio, radar, television |
| url | http://irep.iium.edu.my/45484/ http://irep.iium.edu.my/45484/ http://irep.iium.edu.my/45484/1/45484.pdf |