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Application Notes
The level of experience and expertise required to accurately tune coupled-resonator cavity filters, cross-coupled filters, and duplexers effectively precludes these devices from mass production at high speed. Ironically, these same filters are increasingly needed in large quantities, as a result of the spectral density resulting from the runaway success of wireless communications services. The time required to tune these filters accurately limits manufacturers from increasing their production volumes and reducing manufacturing cost. Fortunately, it is possible to dramatically reduce both the time required to tune these types of filters, as well as the experience and expertise required. The method removes filter tuning from the realm of art, and makes the process predictable and repeatable. Even relatively inexperienced filter tuners can tune multiple-pole filters with great success with a minimal amount of training.
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