Patent ID: 7375601

Claim:
A dual-band oscillator comprising: a first oscillating transistor for generating an oscillation signal in a first frequency band from a collector thereof; a first inductor for supplying electric power to the collector of the first oscillating transistor; a first switching element for switching the first oscillating transistor between an active state and an inactive state; a second oscillating transistor for generating an oscillation signal in a second frequency band from a collector thereof; a second inductor for supplying electric power to the collector of the second oscillating transistor; a second switching element for switching the second oscillating transistor between an active state and an inactive state; and an output terminal for outputting the oscillation signal in the first frequency band or the oscillation signal in the second frequency band to outside of the dual-band oscillator; wherein the first switching element is disposed between the first inductor and the output terminal, and the second switching element is disposed between the second inductor and the output terminal; and wherein the collector of the first oscillating transistor is directly connected to the first inductor, electric power is supplied to a base of the first oscillating transistor via the first switching element, the collector of the second oscillating transistor is directly connected to the second inductor, and electric power is supplied to a base of the second oscillating transistor via the second switching element.