Stable Microwave Source Using High Overtone Bulk Resonators

The high overtone bulk acoustic resonator (HBAR) provides the basis for stable microwave sources. The HBAR´s high Q, closely spaced, periodic resonances provide stabilization for multiple frequency microwave sources. Recently an L-band source with 5 MHz channels has been developed. This HBAR source has phase noise performance equivalent to that of sources based on low frequency quartz crystal stabilization and multiplication, but it requires only a fraction of the hardware.