The electrical benefits of high frequency materials are well understood. There are, however, a number of fabrication concerns related to the most commonly used high frequency materials. These materials include PTFE (Teflon), PTFE with ceramic fillers and non-PTFE thermoset resin systems with ceramic loading, as well as bonding materials used to make multilayers from these materials. In addition, a newer material, LCP (Liquid Crystalline Polymer), while not as commonly used, offers unique properties that enable evolving PCB applications and several hybrid circuit constructions. LCP also has some specific fabrication guidelines that are differentrnThe high frequency circuit materials that have been used in the industry for the longest period of time are the PTFE materials. Most of these materials are not pure PTFE.
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