AEI ceramic duplexers are fabricated with the highest quality ceramic material with a dielectric constant between 30 to more than 90. The dielectric constant is chosen based on size and performance requirements. The lower dielectric constant ceramic material will result in higher Q factors, high temperature stability, and large size, while the high dielectric constant material will result in lower performance, lower temperature stability, but very small size. Their high Q factor leads to higher performance in a minimal size with lower insertion loss and better selectivity. AEI ceramic duplexers are available in surface mount packages, as well as connectorized packages available on request. The size of a ceramic duplexer depends on the frequency range, insertion loss, and selectivity of the ﬁlter and can range in length from 10 to 80 mm.
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