An LTCC Design Technique Based on Accurate Component Models and EM Simulations

This paper describes the LTCC design methodology adopted by TDK. The main aim of the new method is to reduce the number of sample iterations for mobile communication front-end modules. The main elements of the method include, extracting accurate component models, incorporating into the models an automated layout generation facility and linking the layout to an EM simulator for final analysis. The component models discussed include equivalent circuits, EM generated databases and neural network models. Models up to 18GHz have been produced and verified by measurements. The influence of manufacturing process tolerances have been studied and incorporated into the models. Unwanted coupling mechanisms are discussed and examples of the coupling levels between surface pads and embedded components are presented for the first time. The predicted and measured results of a GSM/DCS antenna switch module are presented. The agreement between the predicted response and the measured response is excellent.