How does Murata specify Insertion Loss and Ripple for their high frequency dielectric filters?
For many of Murata’s high frequency filters, be it ceramic block, SAW, or multilayer ceramic, Murata specifies I.L. over the specified pass band relative to 0dB reference level. This differs from many engineer’s description of I.L. which is typically thought of as being the minimum loss point in the filter’s response curve. Murata’s specified maximum I.L. typically occurs at the end of the specified pass band width. Murata then specifies ripple as the difference between the maximum and minimum I.L. points. An example of this I.L. and ripple can be seen in the following graph which shows an 836 MHz center frequency filter that has a pass band range of 824 to 849 MHz.
