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本文表明多条耦合器(MSC)应用在带通滤波器中能降低旁瓣、改善矩形系数.同时还论述了道尔夫一切比雪夫(DolPh-Chebyshev)函数作为窗口在带通滤波器设计中的应用.制作了用MSC耦合两个道尔夫-切比雪夫窗口加权变迹换能器组成的带通滤波器.对影响器件性能的几种二次效应及其抑制方法进行了初步讨论.用本文所述方法所获得的器件在不调谐时的性能为:f_0=30.1兆赫、△f/f_0=8%、插损ILmin=17分贝、3—40分贝矩形系数kD=1.48、通常波纹△b=0.4分贝(相邻峰)、旁瓣抑制≥48分贝.若要更进一步提高性能使其与按理想横向滤波器模型设计的性能一致,则要在设计和制作过程中对二次效应进行更精确的补偿和抑制.
This paper shows that the application of multiple couplers (MSCs) in band-pass filters reduces the side-lobe and improves the squareness coefficients. It also discusses the Dolph-Chebyshev function as a window in bandpass filter design The bandpass filter composed of two DOF-Chebyshev window-weighted adder-tracing transducers coupled with MSC was fabricated.Several secondary effects and their suppression methods were also discussed. The performance of the device obtained by the method described herein when not tuned is: f_0 = 30.1 MHz, Δf / f_0 = 8%, insertion loss ILmin = 17 dB, 3-40 dB rectangular coefficient kD = 1.48, b = 0.4 dB (adjacent peaks), sidelobe suppression ≥ 48 dB To further improve performance to match the performance of the ideal transversal filter model design, secondary effects should be evaluated during design and fabrication More accurate compensation and suppression.