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Title: | Substrate size selection of microstrip-fed cylindrical dielectric resonator antennas for lowering the cross-polarisation |
Authors: | Kumar, A. V. Praveen |
Keywords: | EEE Dielectric Resonator Antenna (DRA) Cross-polarisation |
Issue Date: | Jan-2019 |
Publisher: | IET |
Abstract: | A cylindrical dielectric resonator antenna (DRA) has been excited with a microstrip line in the HEM11δ mode. It is demonstrated that at the operating frequency, minimum cross-polarisation occurs when the lateral dimension of the substrate is slightly higher than half a free-space wavelength (λ0). This occurs when direct waves from the DRA interfere appropriately with the waves that are diffracted from the substrate edges. For a 50 Ω microstrip-fed cylindrical DRA, numerical prediction suggests a substrate of lateral dimension 0.58λ0 for the lowest possible cross-polarisation. In addition, the above optimum substrate size is constant irrespective of the substrate shape (square or circle) or dielectric resonator (DR) properties (permittivity and aspect ratio) for a given substrate permittivity. Numerical results are experimentally verified for a DRA with permittivity 24 and aspect ratio 1.33, for both square and circular substrates at the respective operating frequencies. |
URI: | https://ietresearch.onlinelibrary.wiley.com/doi/full/10.1049/iet-map.2018.5136 http://dspace.bits-pilani.ac.in:8080/xmlui/handle/123456789/9514 |
Appears in Collections: | Department of Electrical and Electronics Engineering |
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