A novel GaAs monolithic microwave integrated circuit (MMIC) active filter structure based on the lumped and transversal technique is proposed for operation in the X-band. This new structure includes a tuned amplifier as transversal element of the filter in order to improve the band-edge rejection. A design example of a bandpass filter centered @7.5 GHz with 2-dB passband ripple and 30-dB rejection @1 GHz apart from passband edges is presented in terms of computer simulations and layout. The simulated results demonstrate its superior performance when compared with the traditional lumped and transversal technique.Index Terms-MMIC, microwave active filter, transversal filter.
Simple models and a parameter extraction technique for low cost SMD capacitors mounted on microstrip lines will be presented. The models are simple networks, easily implemented in currently available microwave CAD programs. Their element values are obtained from the results of vector network analyser measurements on microstrip structures. Therefore, the models will include intrinsically mounting discontinuities.
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