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There are a number of CAD tools available in the market today for microwave designs. They enable the designer to try his hand at even very complex design very easily and quickly. They optimize MEMS designs prior to fabrication, which reduces prototype development cycle time and cuts manufacturing costs. This paper attempts to list a few of the popular CAD tools that are available in the market today...
Artificial neural networks (ANNs) have been promising tools for many applications. In recent years, a computer-aided design approach based on ANNs has been introduced to microwave modelling, simulation and optimization. In this work, the characteristics parameters of edge coupled coplanar waveguides (CPWs) have been determined with the use of models. These neural models were trained with LM, BR, QN,...
The CAD oriented closed-form model is presented to compute frequency dependent effective relative permittivity and characteristic impedance of a slot-line with finite conductor thickness in the range 3 mum-50 mum. The model has average accuracy of about 2% against the fullwave results from different sources in the frequency range 2 GHz-60 GHz, 2.22lesepsivrles20, 0.02lesw/hles1.0, 0.01lesh/lambda0...
Developing noise models for MOS transistors has recently been an active area of work because (i) a noise model is essential for many of the RF and microwave applications of the devices that have been enabled by the high device cutoff frequencies resulting from shrinking gate lengths ; (ii) the existing noise models employed in CAD software have severe limitations of applicability, consistency and...
In bio-medical applications and wireless communication systems, the microstrip antennas are extensively used due to their low-profile feature and ease of fabrication. With recent advances in electromagnetic computer-aided design (CAD), the design of microstrip antenna has been benefited from the utilization of accurate numerical methods. Recently the particle swarm optimization (PSO) was introduced...
Antennas have been increasingly studied in recent years. Different antennas have been designed for different applications based on the characteristics of the receiving side. Antennas cannot be fabricated as such and then be studied on. This leads to waste of material and requires a lot of iterations until we get the final design. In order to study the characteristics of an antenna without fabricating...
A sub harmonically pumped (SHP) diode mixer suitable for direct conversion receiver based on WCDMA standard is presented. In this paper, first we presented a simultaneous signal and noise analysis to analyze a circuit consists of N anti-parallel diode pairs in self-biased structure. Then the results of this CAD routine are confirmed with other method. The mixer is optimized to obtain a maximally flat...
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