Characteristics of the ideal resonator for low Phase Noise oscillator are as follows:

• High Group Delay (high resonator Loaded-Q).
• High operating frequency.

• Low Loss.

• Moderate Drive Capability.

• Low frequency sensitivity to environmental stress (vibration, temperature, etc).

• Good short-term and long-term frequency stability.

• Accurate frequency set-on capability.

• External frequency tuning capability. …