Abstract:
This dissertation reports the design and development of single HEMT based switched resonator dual-band oscillator for 5.2/6.8 GHz wireless applications. Fixed dual band operation was achieved by introducing a novel band switching technique for controlling the negative resistance bandwidth of the HEMT. Oscillator characteristics were optimized to meet the specified IEEE standards. Switched resonators based on membrane and semiconductor switch behavior were also investigated. Commercially available simulation tools ADS and EMDS were used in the modeling of this novel device.
Further, the integration of this oscillator with the planar radiating elements were also investigated. A microstrip patch antenna at 5.2 GHz was designed and used as frequency selective network in the oscillator circuitry. The simulated and measured characteristics of oscillator, integrated with radiating element were found to be as per the requirement of 802.1 lb and 802.1 la ISM standards
