This article presents a novel single-feed circularly polarized patch antenna for dual-band (2.6 and 3.4 GHz) applications. Details of the design procedure and design considerations of the proposed antenna are described. The novelties of the proposed antenna are counted by (i) a meaningful Jia-shaped patch used as the primary radiator; (ii) a 3D Lshaped feeding probe used to excite the stacked patches so that the near degenerate-modes are excited at the desired dual band; (iii) down-tilt beams achieved that are particularly suitable for wall-mount base-stations. The measured 3-dB axial-ratio bandwidths are 2.41-2.61 GHz and 3.25-3.42 GHz, where the maximum gains are recorded as 7.3 and 6.3 dBic, respectively. Methods for the adjustment of band ratio down to 1.18 are discussed. The overall antenna size is 100×100×12.8 mm 3 .
This paper presents a study into the parameter‐retrieval methods of metasurfaces composed of isolated metallic unit‐cells. The classical method based on the effective‐medium theory is revisited by aiming at the point of effective thickness in use. The second method based on the generalized sheet transition conditions is also investigated and the extracted results are mutually verified with the classical method when the unity thickness is used. It is found that these two sets of effective parameters, surface susceptibilities and unity effective parameters, are mutually equivalent if they are not equal. The retrieved values are justified by those results available in literature.
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