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Message: <blockquote data-quote="laal" data-source="post: 8493642" data-attributes="member: 94459">RF and IF Amplifiers and FiltersElectronic filters are electronic circuits which perform  signal processing functions, specifically to remove  unwanted frequency  components from the signal, to enhance wanted ones,  or both. Electronic  filters can be:Radio frequency (RF) and microwave  filters represent a class of  electronic filter, designed to operate on  signals in the megahertz to  gigahertz frequency ranges (medium frequency  to extremely high  frequency). This frequency range is the range used by  most broadcast  radio, television, wireless communication (cellphones,  Wi-Fi, etc...),  and thus most rf and microwave devices will include some  kind of  filtering on the signals transmitted or received. <img src="http://lh5.ggpht.com/_8JZhVVmpICU/S8AobIDoOnI/AAAAAAAAAKQ/Bn-_PFmUhrw/SMT%20Saw%20Filter.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />Such filters  are commonly used as building blocks for duplexers and   diplexers to  combine or separate multiple frequency bands.</blockquote>

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