Printed Antenna Arrays with High Side Lobe Suppression

Abstract

The problem of side lobe suppression (SLS) in printed antenna arrays has been investigated in the paper. Influence of several factors that make difficult design and realization of antenna arrays with relatively high SLS has been analyzed. We introduced a new type of printed antenna array with symmetrical pentagonal dipoles and symmetrical tapered feed network with Chebyshev distribution enabling SLS better than 34 dB in E-plane. Agreement between simulated and measured results is very good. The antenna is suitable for integration with other microwave circuits. Presented antenna is low cost and very simple for realization.

Side lobe suppression of printed antenna array with perpendicular reflector

“…with the least width. The all antenna arrays with the high SLS are very sensitive in small deviation from ideal parameters that can results in decreasing SLS values [8][9]. Also, the impedance transformers of small width can be difficult to produce due to limitations of photolithographic process.…”

“…A relatively small number of publications dealing with this issue are available [2][3][4][5][6]. The mentioned limitations in realization of printed antenna arrays with relatively high SLS can be overcome using antenna arrays with printed dipoles, usually in a pentagonal shape (one half of them on one side and another half on the opposite side of the substrate) [7][8][9][10]. These dipoles operate on the second resonance and are fed by a symmetrical (balanced) microstrip line.…”

“…These dipoles operate on the second resonance and are fed by a symmetrical (balanced) microstrip line. The dipole's impedance varies with frequency very slow which is of crucial importance for arrays with high SLS [8]. Also, due to the fact that feed network is symmetrical and consists of symmetrical balanced microstrip lines, parasitic radiation from it is practically eliminated.…”

“…In previous research [7][8][9][10], the antenna arrays with corner and cylindrical reflector were investigated. The antenna radiating elements are fed by tapered distribution enabling relatively high SLS.…”

Towards radar barriers for animal fatality detection at wind turbines: numerical and preliminary experimental results

“…A key aspect of the proposed method is a strong asymmetric antenna pattern with a high gain in vertical and a low gain in azimuthal direction. Such antenna concepts are available in the literature: a patch antenna array with 1 × 8 elements is proposed in [17, 18] that has a wide beam of about in the horizontal plane and a narrow beam of only in the vertical plane. It is also possible to achieve even narrower beam widths as described in [19] using a 2 × 24 array.…”