Abstract
A wideband wide-scanning open-ended rectangular waveguide phased array in a triangular lattice is presented. Dielectric or metamaterial wide-angle impedance matching superstrates have been widely used in phased arrays to improve the scanning performance. However these dielectric-containing covers cannot solve the problem of scan blindness caused by the surface waves, or even further aggravate the surface wave effect. The modulated surface structures, which consist of the impedance-gradient structures and the surface wave bandgap structures are designed to maximize the wideband wide-scanning performance of the array. The proposed array achieves 40% bandwidth (8–12 GHz), while covering a scanning range of ±65° in the E-plane (VSWR < 2.3) and H-plane (VSWR < 2). The practical working frequency band occupies the whole potential operating frequency band between the waveguide TE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">10</sub> cutoff frequency and the onset frequency of the first grating lobe. An <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$11\times11$ </tex-math></inline-formula> prototype is fabricated and measured. Good agreement is achieved between the simulated and measured results.
Highlights
Phased array antennas, due to their agile scanning beams, are highly desirable in various domains, such as wireless communication systems [1], radio telescopes [2], and radars [3]
Wide-angle impedance matching (WAIM) technology has been employed [24]. It can be realized by the dielectric slabs [9], [25], metasurfaces [26] or metamaterials [27] placed above the phased array aperture, improving the wide-scanning performance in the desired frequency band
WAVEGUIDE ARRAY WITH MODULATED SURFACE STRUCTURES By using the tapered metallic walls, broad surface wave bandgaps can be constructed in both E- and H-planes, effectively removing the scan blindnesses
Summary
Due to their agile scanning beams, are highly desirable in various domains, such as wireless communication systems [1], radio telescopes [2], and radars [3]. The electromagnetic bandgap (EBG) structures or metamaterials which can suppress surface waves propagation inside its forbidden bandgap have been used to eliminate scan blindnesses in dipole arrays [19], patch arrays [20] and waveguide end-slot arrays [21] This is an effective method but only fits for planar printed apertures. It can be realized by the dielectric slabs [9], [25], metasurfaces [26] or metamaterials [27] placed above the phased array aperture, improving the wide-scanning performance in the desired frequency band While these dielectriccontaining WAIM covers will further aggravate the surface wave effect, deteriorating the scanning performance at high frequencies.
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