Compact Dual-Frequency 2-D Van Atta Array Using the Reconfigurable AMC Antenna
Xiao-Fei Li, Yong‐Ling Ban, Qiang Sun, Yongxing Che, Jun Hu
Abstract
The complexity of the Van Atta array increases sharply with the expansion of scanning dimensions and working frequencies, making it difficult to achieve a planar dual-frequency 2-D Van Atta array. This study proposes a planar, compact, dual-frequency 2-D Van Atta array with 25 antennas and 13 microstrip lines. A novel reconfigurable artificial magnetic conductor (AMC) structure and a 2-D dual-frequency interleaving array are designed to reduce the complexity of the Van Atta array. The reconfigurable AMC is used to reduce the thickness of the planar monopole antenna at 11.6 GHz and is reused as a patch antenna at 5.8 GHz. The total size of the Van Atta array is 2.98 × 2.98 × 0.068 <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">λ<sub>h</sub></i> <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> . According to the measured results, the Van Atta array operates at 5.75 and 11.4 GHz. The −4 dB beamwidths of the monostatic radar cross section (RCS) at 5.75 GHz are 87° ( <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">H</i> plane) and 145° ( <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">E</i> plane), and the −4.5 dB beamwidths of the monostatic RCS at 11.4 GHz are 75° ( <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">H</i> plane) and 96° ( <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">E</i> plane).