In this paper, radiation patterns of a single-layer microstrip antenna, which can be switched to operate under dual TM 11 modes of a circular patch and a TM 21 mode of a concentric annular shorted ring patch, is investigated and presented. Broadside and monopole-like patterns under multi modes are combined to broaden the antenna main-beam coverage. Besides, based on the current distributions of these modes, several slots are etched to realize antenna miniaturization. The miniaturized pattern reconfigurable antenna with a joint wide beam is applied to a dual-polarized 5 Â 5 planar array, which can scan its main beam from À60 to 60 in both orthogonal planes with a gain fluctuation less than 3 dB. In addition, the array is synthesized with the convex optimization approach to obtain low sidelobe level in its wide-angle scanning range, validated by a full-wave simulation study followed by the experimental verification.
A low‐profile planar phased array based on the hybrid‐mode patch technique is presented to achieve the goal of increasing the scanning angle. The array element antenna simultaneously operates at TM10 and TM20 modes of two rectangle patches. By adjusting the length of a slot etched on one patch, the far field of the two modes can be combined by a certain proportion, and thus the complementary beams realize wide‐beam radiation. Besides, in order to improve the array active reflection performance in a wide‐scan range, the slot technique is adopted to achieve the element miniaturization, and a grounded isolator is introduced to reduce the mutual coupling between the array elements. The proposed phased array shows a measured main‐beam coverage from −68° to +66° with its gain fluctuation and sidelobe levels lower than 1.5 and − 10 dB, respectively.
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