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Acoustic Coding Metasurfaces
In article number 2308349, Hao‐Wen Dong and co‐workers employ topology optimization techniques to design a 3‐bit broadband acoustic coding metasurface. With the 3‐bit coding units, a broadband acoustic vortex metasurface is established. Within the target frequency domain, it can modulate reflected acoustic waves into vortex waves. Combined with convolution methods, we...
The acoustic coding metasurfaces (ACMs) have the ability to manipulate complex acoustic behavior by reconstructing the coding sequence. In particular, the design of broadband coding enhances the versatility of ACMs. ACMs offer significant advantages over traditional metasurfaces, including a limited number of units and flexible wave control performance. The unit quantity is determined by 2n, with...
<?Pub Dtl?>In this paper, a novel compensation technique is proposed to improve the imbalance of a Marchand balun due to the unequal odd- and even-mode phase velocities of the coupled lines. Using this method, the fundamental rejection of the balanced doubler with the Marchand balun can be effectively enhanced. Two single-balanced doublers using the improved Marchand balun are designed, fabricated,...
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