16‐Element circular polarised antenna array based on sequential arrangement of non‐identical disc patches

Abstract

A circular polarised antenna array based on the recursive application of the sequential rotation architecture is presented. The first level sequential arrangement is applied to a set of four non-identical slightly detuned patches, resulting in a broadband improper array. At the second level, the sequential arrangement is applied to four identical first-level sub-arrays, regularising the structure. Experimental validations confirm a gain exceeding 10 dB from 5.35 to 7.25 GHz, with a maximum of 13 dB. Global bandwidth is 30% despite an area of only 2.84l 2 0

Direct synthesis for sequential networks with an arbitrary number of outputs

“…[17][18][19][20][21] Furthermore, it can be reiterated in cascade, achieving outstanding performances. [22][23][24] In the most general case, a CP array implemented according to the SRA approach consists in a set of N antennas geometrically rotated and arranged as an uniform circular array. Each element is fed with a signal of the same amplitude, but with a linearly progressive phase such that each antenna has a delay equal to Δϕ = 2π/N with respect to the preceding one.…”

“…SRA is a wide‐spread approach, which both improves the CP operation bandwidth and mitigates fabrication tolerances 17–21 . Furthermore, it can be reiterated in cascade, achieving outstanding performances 22–24 …”

A low‐profile dual‐polarized patch antenna array based on quasi‐cruciform coupling slot

“…Over the past decades, there are many dual-polarized antenna arrays with various types of antenna topologies have been proposed. [1][2][3][4][5][6][7][8] Two orthogonal L-probes is used to excite two orthogonal modes of the dualpolarized antennas as the general method achieving dual polarization performance. 2,3 Traditional dualpolarized antennas, 4,5 as one classic antenna type, are always employed to achieve dual polarizations.…”

“…However, the profiles of these antennas are high. Microstrip antenna has the advantage of light weight, low profile, and low cost for easy fabrication, [4][5][6] which are good candidates. Therefore, in the past few decades, extensive research has been conducted on dual-polarized microstrip antennas.…”

“…In previous designs, slot-coupled patch antennas have attracted significant attentions for dual-polarized antenna arrays since they have merits of planar feeding structures, wide operating bands, high isolation, [4][5][6][7][8] and so on. In our previous work, 9 we have proposed a dual-polarized antenna with low profile, but it has not been used in the antenna array.…”