Abstract
A quantity called available directivity is defined for a radiating structure in terms of its characteristic mode content. It is shown how its maximum value can be evaluated when a certain number of such modes are considered to be excited with appropriate modal excitation coefficients. The achievable directivity is found by constraining the associated quality factor. This provides a more precise way of determining the prospective directivity of a structure than the usual estimates in terms of the spherical wave modes related to the smallest sphere enclosing the structure.
Original language | English |
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Article number | 8759090 |
Pages (from-to) | 6686-6691 |
Number of pages | 6 |
Journal | IEEE Transactions on Antennas and Propagation |
Volume | 67 |
Issue number | 10 |
DOIs | |
State | Published - Oct 2019 |
Keywords
- Achievable directivity
- available directivity
- characteristic modes (CMs)
- radiating structures
- super-directivity