Research of the Effect of PUMA Cell Design Dimensions on its Radiation Characteristics

An ultra-wideband tightly coupled array antenna with low profile is proposed in this paper. PUMA arrays are broadband, but they don't always have good frequency overlap, but benefit from the size and lightness of design. The presented model is characterized by simplicity of design and simplified feeding from coaxial cables. The analyses in this paper focus on a PUMA cell as part of a tightly coupled infinite array, where the mutual coupling between the elements is used to extend the operating frequency bandwidth of the array by changing its dimensions, the shape of the dipole arms and the capacitive metal plates. Metal cylinders printed on dielectric layers adjacent to the dipoles provide capacitive coupling between the arms of the dipoles. The first design considered, with a size of 30×30 mm, has a low profile, at a high frequency of 5.13 GHz, the cell height is
$\lambda_{\text{high}}/2.7$
, with a frequency overlap of 4.66:1. A design with reduced dimensions was also considered, which made it possible to extend the working frequency band, it is also low profile
$(\lambda_{\text{high}}/2.5)$
, the frequency overlap is 4.4:1.