Ripples on the skirt of edge coupled filter at 6.2GHz
时间：03-30
整理：3721RD
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Hi all,
I am trying to design a third order chebyshev edge coupled bandpass filter. The center frequency of the filter is 6.2 GHz with a 10% fractional bandwidth.I manufactured the filter and measured it with network analyzer.The passband is fine. But the upper skirt of the filter has ripples on it. It is not a straight line.But the lower skirt of the filter is normal.No ripples on it. I simulated the filter by using AXIEM. And i didint see any ripples on the skirts of the filter. I repeated the calibration of the network analyzer several times and checked the parameters of the filter on the manufactured board.
Anyone has an idea about itŞ
Thank you very much....
I am trying to design a third order chebyshev edge coupled bandpass filter. The center frequency of the filter is 6.2 GHz with a 10% fractional bandwidth.I manufactured the filter and measured it with network analyzer.The passband is fine. But the upper skirt of the filter has ripples on it. It is not a straight line.But the lower skirt of the filter is normal.No ripples on it. I simulated the filter by using AXIEM. And i didint see any ripples on the skirts of the filter. I repeated the calibration of the network analyzer several times and checked the parameters of the filter on the manufactured board.
Anyone has an idea about itŞ
Thank you very much....