An improved nonlinear analysis and design method of microstrip oscillators based on modern CAD techniques

In this paper, a novel nonlinear oscillator design methodology is proposed to obtain an improved microstrip oscillator performance. It combines the advantages of both quasi-linear and nonlinear design approaches. It uses an accurate implemented nonlinear MESFET model, based on multi-bias measurements. It also uses an enhanced harmonic balance nonlinear analysis technique. This design method makes full use of the powerful capabilities of the up-to-date CAD techniques in designing, simulating, and optimizing microstrip oscillators, taking all discontinuities, parasitics and packaging effects into consideration. Finally, an 8.5 GHz oscillator is fabricated and an excellent agreement between the theoretical and experimental results is obtained