UCLA

A microwave oscillator is integrated with a zeroth order resonance (ZOR) antenna to build an active oscillating antenna using the coplanar waveguide (CPW) technology. In this thesis, the basic metamaterial concept is introduced to understand the ZOR antenna and negative resistance method is also introduced to explain the design procedure of the oscillator type active integrated antenna (AIA). The CPW technology is utilized to design the entire circuit. The CPW TL gives a lot of advantages such as fabrication simplicity and design freedom. The ZOR antenna is utilized due to its electrically small size and high Q-factor which results in good phase noise of -92.5dBc/Hz at 100kHz offset. The proposed AIA is designed to achieve high DC-RF power conversion efficiency by suppressing higher order harmonic power. As a result, the radiated power of 14.57dBm (28.64mW) and the effective isotropic radiated power of (EIRP) 16.11dBm (40.83mW) is obtained with high DC to RF efficiency (27.2%), which is much higher than other active oscillator type AIA designs.