Abstract: This paper reports on a 6.4-GHz spurious-free filter based on first-order symmetric (S1) mode resonator fabricated in X-cut lithium niobate (LN) thin film. Specifically, we studied the ...
The S1 heart sound happens when the tricuspid and mitral valves close. A loud S1 may mean there is a problem with the heart, like mitral stenosis or tachycardia. Mitral stenosis is when the mitral ...