We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Suppresion of Log‐Periodic Dipole Antenna Spurious Radiation by Lumped Element Loading for Radioastronomical Application.
- Authors
Kyriakou, Georgios; Bolli, Pietro; Mezzadrelli, Lorenzo
- Abstract
Log‐Periodic Dipole Antennas have been known to provide good performance over large fractional bandwidths. However, optimized designs of log‐periodic antennas, in particular for radioastronomy and remote sensing, need to tackle the spurious radiation of secondary dipole harmonics that can compromise the gain smoothness and therefore the ability to detect natural spectral features emitted by the probed sources. A new, low‐cost method applicable also at a post‐design stage is proposed in this paper, which relies on loading some of the dipoles with appropriate lumped circuit elements in order to avoid this unwanted feature while preserving the desired performance characteristics. Application is found on the log‐periodic dipole antenna selected for the low‐frequency instrument of the SKA (Square Kilometer Array), and general guidelines are described for other designs. An experimental test using a transmitting VHF antenna and the antenna under test with new RLC loaded dipoles confirms our solution. Key Points: A spurious radiation problem of the log‐periodic dipole antenna used for Square Kilometer Array‐Low affects its performance with respect to spectral smoothnessA solution is proposed by means of loading the affected dipoles with appropriately designed parallel RLC circuitsExperimental verification using measured scattering parameters in the near‐field of a two‐antenna system is provided
- Subjects
LUMPED elements; DIPOLE antennas; TRANSMITTING antennas; ANTENNAS (Electronics); CIRCUIT elements; ANTENNA design
- Publication
Radio Science, 2023, Vol 58, Issue 8, p1
- ISSN
0048-6604
- Publication type
Article
- DOI
10.1029/2023RS007758