Optimization of broadband withdrawal weighted interdigital transducers for high selective SAW filters
Optimization of broadband withdrawal weighted interdigital transducers for high selective SAW filters
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DOI：
10.1109/58.796132
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发表时间：
1999-09-01
影响因子：
3.6
通讯作者：
Bausk, EV
中科院分区：
文献类型：
--
作者：
Bausk, EV
讨论的问题是设计具有均匀电极的高选择性宽带声表面波叉指换能器。在大多数SAW滤波器中，这种换能器与变迹叉指换能器一起使用或代替它们。所提出的优化算法是为了改善IDT的选择性通过撤回加权（WW）技术。与常见的WW换能器优化方法不同，这些算法选择最佳IDT结构的基础上，以及它满足规格，而不是在时间，而是直接在频域。这种方法对于宽带WW换能器更有效。许多SAW滤波器已被设计使用所描述的算法。它们的实验特性如下：0.5至15%的带宽，40至50 dB的阻带抑制，1.07至1.3的3 dB/40 dB形状因子。
The problem under discussion is the design of highly selective broadband surface acoustic wave (SAW) interdigital transducers (IDT) with uniform electrodes. In most SAW filters, such transducers are used with apodized IDTs or instead of them. The proposed optimization algorithms are intended for improvement of IDT selectivity by means of a withdrawal weighting (WW) technique. Unlike the familiar methods of WW transducer optimization, these algorithms choose the best IDT structure on the basis of how well it meets the specifications, not in the time but in Frequency domain directly. This approach is more effective for broadband WW transducers. A number of SAW filters have been designed using the described algorithms. Their experimental characteristics follow: bandwidths of 0.5 to 15%, stopband rejection of 40 to 50 dB, 3 dB/40 dB shape factors of 1.07 to 1.3.