Microstrip filter design ADS (Zhejiang University) Microstrip filter design (ADS) Hybrid 002 class Li Li 30030010321. Principle The filter designed this time is mainly for the antenna designed previously, that is, to achieve the final cascade. Therefore, it is necessary to explain the specific specifications of the antenna designed last time: The antenna designed last time works near 2.5GHz, and the filter I designed here is designed for mobile communication, requiring a narrow bandwidth, so that the bandwidth is about 50MHz, which is in line with the range that the antenna can provide. The substrate parameters used by the filter are still εr= 9.8, h=1.27mm, and the width of the 50ohm impedance transmission line on the substrate is about 1.22mm. The main design requirements of the filter are as follows: Center frequency G0 = 2.5GHz Bandwidth = 50MHz ~ 70MHz (calculated as 50MHz) Attenuation at 2.55GHz reaches 25dB The filter designed here is an edge-coupled parallel coupled line bandpass filter. The design diagram is as follows: 2. Calculate the main parameters 1. Transformation from low-pass to bandpass frequency [pic] Here W is the relative bandwidth, [pic] = 0.02 to get [pic] = 2, if the Chebyshev prototype is used, the table shows that this filter is n = 4 levels. The component values of the Chebyshev prototype with a ripple factor of 0.01dB are: g0 = 1; g1 = 0.7168; g2 = 1.2003; g3 = 1.3212; g4 = 0.6476; g5 = 1.1007; [pic] = 1 And for simplicity, a symmetrically coupled end section is used. 2. [pic]=1.5551=[pic]; [pic]=31.828; Calculate the G parameters as follows: [pic]=1.1811; [pic]=1.1844; [pic]=1.0781; [pic]=0.7941; [pic]=1.0811; When the filter...
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