The authors reported band-pass (BP)-type tunable filters composed of ultrawide band (17%) surface acoustic wave (SAW) resonators composed of grooved Cu electrodes on 4°YX-LiNbO 3 and interdigital capacitors (IDCs) on the same LiNbO 3 substrate. However, the frequency of the tunable filter did not shift continuously because the capacitance of the IDCs was fixed. This time, the tunable filter with the frequency tunable range of 6.1% shifting continuously was obtained for the first time by applying voltage to the variable capacitance diode. The authors discuss the mechanical quality factor (Q) of variable capacitors and characteristics of the tunable filters.
ASJC Scopus subject areas
- Physics and Astronomy(all)