Frequency tuning is essential for quality control of high-temperature superconductor (HTS)
filters for mobile communications. We demonstrate a simple tuning method that enables a
∼500 MHz
(∼10%)
shift of the center frequency of a three-pole microstrip filter with a small change in the bandwidth
(∼7%). Two dielectric plates placed above the filter structure were used for this purpose, with
the dielectric constants of the two plates being 24 and 45, respectively. Simulated results
obtained by using a full-wave electromagnetic analysis appeared to agree well with the
measured values.
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