A microelectromechanical resonator comprising: a drive electrode (14, 514); and a beam (24, 324, 524, 624) disposed adjacent to the drive electrode (14, 514), wherein the beam (24, 324, 524, 624) comprises: first and second, parallel to each other, exterior walls (26, 526), the first and second exterior walls being spaced apart along the longitudinal axis (L--L) of the beam (24, 324, 524, 624), and perpendicular to the longitudinal axis (L--L), first and second resonator sections (18, 30) connecting the first and second exterior walls (26, 526), the first resonator section being arranged closer to the drive electrode (14, 514) than the second resonator section, and first and second interior walls (28, 528), parallel to the first and second exterior walls (26, 526), and extending from the first resonator section to the second resonator section, wherein the first exterior wall (26, 526), the first and second resonator sections (18, 30) and the first interior wall (28, 528) form a first channel through the beam (24, 324, 524, 624), the second exterior wall (26, 526), the first and second resonator sections (18, 30) and the second interior wall (28, 528) form a second channel through the beam (24, 324, 524, 624), the first and second channel penetrating the beam from one side to the other in a direction perpendicular to the longitudinal axis (L--L) of the beam (24, 324, 524, 624), the first and second resonator sections (18, 30) being oppositely arranged with respect to the central axes along the channels, and the drive electrode (14, 514) is arranged to impart a force from the drive electrode upon the beam (24, 324, 524, 624) to cause the beam (24, 324, 524, 624) to (24, oscillate under conditions which cause the beam (24, 324, 524, 624) to oscillate at a resonant frequency; wherein the beam (24, 324, 524, 624) is a bridge that is disposed upon two pedestals. a drive electrode (14, 514); and a beam (24, 324, 524, 624) disposed adjacent to the drive electrode (14, 514), wherein the beam (24, 324, 524, 624) comprises: first and second, parallel to each other, exterior walls (26, 526), the first and second exterior walls being spaced apart along the longitudinal axis (L--L) of the beam (24, 324, 524, 624), and perpendicular to the longitudinal axis (L--L), first and second resonator sections (18, 30) connecting the first and second exterior walls (26, 526), the first resonator section being arranged closer to the drive electrode (14, 514) than the second resonator section, and first and second interior walls (28, 528), parallel to the first and second exterior walls (26, 526), and extending from the first resonator section to the second resonator section, wherein the first exterior wall (26, 526), the first and second resonator sections (18, 30) and the first interior wall (28, 528) form a first channel through the beam (24, 324, 524, 624), the second exterior wall (26, 526), the first and second resonator sections (18, 30) and the second interior wall (28, 528) form a second channel through the beam (24, 324, 524, 624), the first and second channel penetrating the beam from one side to the other in a direction perpendicular to the longitudinal axis (L--L) of the beam (24, 324, 524, 624), the first and second resonator sections (18, 30) being oppositely arranged with respect to the central axes along the channels, and the drive electrode (14, 514) is arranged to impart a force from the drive electrode upon the beam (24, 324, 524, 624) to cause the beam (24, 324, 524, 624) to (24, oscillate under conditions which cause the beam (24, 324, 524, 624) to oscillate at a resonant frequency; wherein the beam (24, 324, 524, 624) is a bridge that is disposed upon two pedestals. first and second, parallel to each other, exterior walls (26, 526), the first and second exterior walls being spaced apart along the longitudinal axis (L--L) of the beam (24, 324, 524, 624), and perpendicular to the longitudinal axis (L--L), first and second resonator sections (18, 30) connecting the first and second exterior walls (26, 526), the first resonator section being arranged closer to the drive electrode (14, 514) than the second resonator section, and first and second interior walls (28, 528), parallel to the first and second exterior walls (26, 526), and extending from the first resonator section to the second resonator section, wherein the first exterior wall (26, 526), the first and second resonator sections (18, 30) and the first interior wall (28, 528) form a first channel through the beam (24, 324, 524, 624), the second exterior wall (26, 526), the first and second resonator sections (18, 30) and the second interior wall (28, 528) form a second channel through the beam (24, 324, 524, 624), the first and second channel penetrating the beam from one side to the other in a direction perpendicular to the longitudinal axis (L--L) of the beam (24, 324, 524, 624), the first and second resonator sections (18, 30) being oppositely arranged with respect to the central axes along the channels, and the drive electrode (14, 514) is arranged to impart a force from the drive electrode upon the beam (24, 324, 524, 624) to cause the beam (24, 324, 524, 624) to (24, oscillate under conditions which cause the beam (24, 324, 524, 624) to oscillate at a resonant frequency; wherein the beam (24, 324, 524, 624) is a bridge that is disposed upon two pedestals.