Design of an ultrawide band microstrip amplifier using 3D Sonnet based SVRM with particle swarm optimization

In today?s world, microwave technology has an important place for communication and military systems. With this growing importance, it is needed expeditious, high-accurate, feasible design systems. Therefore, 3D computer aided design has a significant role. Nowadays, 3D EM simulation programs are too thrived and it could give high-accurate results which are close to practical experiments. Although 3D simulations are so accurate; there is significant disadvantage like slowness. In order to solve this problem, one of the important methods is learning machines. Nonlinear learning machines are widely employed as the fast and flexible machines in the generalization of the highly nonlinear input-output discrete mapping relations in the microwave modeling. In this study, Support Vector Regression machine is used to model microstrip transmission line. Coarse and fine model of microstrip line is obtained. The SVRM model of microstrip line is high-accuracy like 3D EM simulation programs and fast like empirical formulations.Microwave low noise amplifiers are used front-end element for receiver systems. Besides, an ultra wide-band(UWB) amplifier is useful for systems because of capability of multi-band operation. A robust and efficient design optimization of a microstrip amplifier is carried out so that geometry of all the microstrip lines W,L,T,?r,H,tan? where W,L,T and ?r,H,tan? are the subvectors including widths, lengths and thicknesses of the microstrips and relative dielectric constant, height and loss of the selected substrate, respectively, can be obtained from the output to be used as the input and output matching elements of a transistor subject to its potential performance. In the optimization procedure, the Electromagnetic (EM) - based Support Vector Regression Machine (SVRM) is employed to build the mapping relations between the characteristic impedance (Z0 )/the effective relative dielectric constant (?eff) of the equivalent transmission lines and the microstriplines W,L,T,?r,H as fast as a coarse model at the same time as accurate as a fine model. In the work, quasi-TEM microstripline synthesis formulas are used as a coarse database and the full-wave EM Simulator, Sonnet provides the fine Database. The source and load {ZS(?), ZL(?)} termination couple corresponding to the compatible (Noise F(?), Input VSWR Vi(?), Gain GT(?),Bandwidth B) quadrates are utilized as the feasible design target resulted from the performance characterization of the selected high technology transistor subject to the Darlington theorem. Furthermore Particle swarm intelligence is successfully implemented as a comparatively simple and efficient algorithm in the optimization process of the input and output matching circuits. Finally typical design of a single transistor, microstrip, Ultra - Wideband (UWB) amplifier is presented as a worked example with the maximum gain, simultaneously ensuring the available minimum noise and a permitted small constant mismatching at each operation frequency, that corresponds to the (Fmin(?), Vireq, GTmax(?), B) quadrate.Furthermore, performance of the resulted amplifier with the determined microstrip lines within the technological limitations is verified with Microwave Office AWRDE simulation program. Besides, the designed amplifier is fabricated and measured. Then, all of the results are compared each other.