Circuit Modeling and EM Simulation Verification of DGS based Low-Pass Filter Employing Transmission Line Model along with Microstrip-Slotline Transitions

In this paper, an equivalent circuit model (ECM) for a defected ground structure (DGS) pattern is proposed and evaluated for designing a compact low-pass filter (LPF). The proposed ECM is based on microstrip lines and microstrip-slotline transitions. Every slotlines of the DGS unit are modeled by ideals transmission lines of characteristic impedance and electrical length. Comparison between full-wave EM and circuit simulations illustrates the validity of the proposed ECM

Circuit Modeling and EM Simulation Verification of DGS based Low-Pass Filter Employing Transmission Line Model along with Microstrip-Slotline Transitions

In this paper, an equivalent circuit model (ECM) for a defected ground structure (DGS) pattern is proposed and evaluated for designing a compact low-pass filter (LPF). The proposed ECM is based on microstrip lines and microstrip-slotline transitions. Every slotlines of the DGS unit are modeled by ideals transmission lines of characteristic impedance and electrical length. Comparison between full-wave EM and circuit simulations illustrates the validity of the proposed ECM

Non-conventional Multiband Patch Antenna Design with Filtering Aspect Based on Genetic Algorithm

This paper addresses the multiband patch antenna design using an improved straightforward method based on genetic algorithm. Starting from a random matrix of squared pixel shapes, the GA optimizes the final design in order to obtain desired specifications, for instance: good impedance matching in required frequency-bands and rejection of undesired bands by integrating appropriate filter. The program is implemented with visual basic script integrated in CST software. The method overcomes the classical design way since the optimized design can be automatically achieved without interfering with designer (independent conception). Validation of the proposed procedure is carried out through simulations and measurements of two patches (dual and tri-band) for WiMAX, WLAN, and X-band applications. Obtained results are in good agreement and demonstrate the effectiveness of the proposed design method