Articles
RSSTradeoffs And Other Requirements When Specifying RF Filters
July 25, 2008
Tradeoffs are paramount in understanding manufacturing and design cost drivers when it comes to specifying RF filters. For example, over-specifying requirements for a bandpass filter like low insertion loss accompanied with very high rejection within a narrow bandwidth of the passband increases the complexity, size, and the cost of the design as well, adding extra manufacturing efforts in the build and test cycles. Another example is VSWR, normally 1.5:1 satisfies most applications, but if over-specified for example as 1.2:1, can lead to additional design as well as tuning efforts in the test and integration stages of the process. This article focuses on tradeoffs to assist the RF System Engineer to understand and consequently specify requirements realistically as well as more effectively for the various types of RF Filters presented here, thereby reducing cost and delivery impacts in the form of delays and cost overruns, and of course, "getting it right the first time". BE AWARE, INCREASED PERFORMANCE USUALLY INCURS A HIGHER COST!
Component tolerances, losses and temperature coefficients limit the performance of an RF Filter, particularly for LC filters.
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