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本文报导采用两个换能器都进行了切趾加权和一多条耦合器结构的声表面波带通滤波器.滤波器的中心频率(f_0)为56MHz,相对带宽(△f_(3dB))为41%,矩形系数(3dB和40dB的带宽比)为1.41,带内波纹(△R)为±0.6dB,阻带抑制(SS)为-42dB和插入损耗(IL_(min))为27dB.为了使宽带滤波器具有很低的矩形系数,采用了衍射损耗补偿技术.改进的滤波器的性能参数为f_O=50MHz,△f_(3dB)=47.6%,矩形系数(3dB和30dB的带宽比)=1.12,△R=±0.7dB,SS=-37dB和IL_(min)=31dB.
In this paper, the acoustic surface wave band-pass filter with apodization weighted by a couple of transducers and a couple of coupler structures is reported. The center frequency (f_0) of the filter is 56 MHz and the relative bandwidth (Δf_ (3dB)) Was 41%, the squareness coefficient (3dB and 40dB bandwidth ratio) was 1.41, the in-band ripple (ΔR) was ± 0.6dB, the stopband rejection (SS) was -42dB and the insertion loss (IL min) was 27dB. In order to make the wideband filter have very low rectangle coefficient, the diffraction loss compensation technique is adopted.The performance parameters of the improved filter are: f_O = 50MHz, △ f_ (3dB) = 47.6%, rectangular coefficient (3dB and 30dB bandwidth ratio) = 1.12, ΔR = ± 0.7dB, SS = -37dB and IL_ (min) = 31dB.