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[Graph Drawing] FDTD.f DL : 0: 三维光子晶体的带系和结构模拟程序，用matlab编写，很好用的。-Three-dimensional photonic crystals with line and structure simulation program, using matlab to prepare, very good use.
Date : 2025-12-24 Size : 5kb User : 李华
[Graph Drawing] lvboqisheji DL : 0: 设计一个IIR数字低通滤波器，逼近一组模拟滤波器的指标参数（通带截止频率Wp=2*pi*2000rad/s,阻带边界频率Ws=2*pi*3000rad/s,通带波纹 Rp=3db, 阻带衰减Rs=15db, 采样频率f=10000Hz）；分别用脉冲响应不变法和双线性变换法实现设计，列出传递函数并描绘模拟和数字滤波器的幅频和相频响应曲线。用上述设计滤波器完成几组给定信号的滤波，证明滤波器的有效性和滤波范围限制.-Design a IIR digital low-pass filter, approaching a group of analog filters indicator parameters (pass-band cut-off frequency Wp = 2* pi* 2000rad/s, stop-band edge frequency Ws = 2* pi* 3000rad/s, pass-band ripple Rp = 3db, stop-band attenuation Rs = 15db, the sampling frequency f = 10000Hz) were used to change the impulse response method and bilinear transformation method for design, list and describe the transfer function of analog and digital filter amplitude-frequency and phase-frequency response curve. A filter was designed with the completion of the above-mentioned groups of a given signal filtering, to prove the effectiveness of filters and filter limit
Date : 2025-12-24 Size : 70kb User : 刘文珍
[Graph Drawing] Fresnel-zone-platel DL : 0: 菲涅尔波带片设计Matlab程序代码输入波长 Lambda = 632.8nm，设计波带片波长f = 1000mm，k=100 绘制菲涅尔波带片图样 -Fresnel zone plate designed Matlab program codes enter the wavelength Lambda = 632.8nm the design zone plate wavelength f = 1000mm, k = 100 draw a Fresnel zone plate pattern
Date : 2025-12-24 Size : 1kb User : 付雄华