This paper presents the modelling and simulation of microwave amplifiers for enhanced power gain stability with the objectives of showing how scattering parameters (s-parameter) could be used; and also to show how the data so generated could be used in calculating the Rollett stability K, which states that a microwave amplifier is stable if K is greater than unity. This was made possible by simulating the behaviours of two commercial microwave amplifiers (A03184ia and M86576v5) using a set of software called PUFF; a microwave simulation program with a high level of accuracy for calculating scattering parameters of an amplifier. However, the result obtained after several tests, experimentations and simulations such as resistive loading test, input and output reflection coefficient improvement test gave a perfect match; a situation where all the scattering parameters meet at the centre of the smith chart with a Rollett stability factor K of 6.635 which signifies that the microwave amplifier stability enhancement has been achieved.

Full text: IJEIR-1302_final.pdf