Dielectric resonator device, oscillator and transmitter-receiver apparatus

A dielectric resonator device comprising:

• a circuit substrate having a ground electrode and a transmission line;
• a dielectric resonator attached to the circuit substrate at a position facing the ground electrode and coupled to the transmission line, the dielectric resonator including a dielectric substrate and electrodes disposed on opposite surfaces of the dielectric substrate, the electrodes respectively having openings that face each other;
• an insulating layer located between the ground electrode of the circuit substrate and the electrodes of the dielectric resonator so as to insulate the ground electrode from the electrodes;
• and
• an insulative adhesive provided at one of the openings of the electrodes of the dielectric resonator for joining the dielectric resonator to the circuit substrate such that the electrode of the dielectric resonator facing the ground electrode of the circuit substrate is electrically insulated from the ground electrode of the circuit substrate.