Dual-mode filters are important for the design of satellite communication systems. In such electronic systems, where small size and light weight are highly critical, elliptic filters are thus far the best choice owing to their lowest-order among other filter configurations. In this paper, we present a new computer aided design (CAD) approach for the design of dualmode elliptic filters in Ku-band. The proposed knowledge-based approach combines equivalent circuits, electromagnetic (EM) concepts, an EM solver, and the segmentation method into a unified framework. In the design phase, elliptic integral and an equivalent circuit model are used to determine filter geometry. By applying the segmentation concept, efficient simulation-based tuning of the filter is carried out in the tuning phase. The proposed approach is illustrated via design of a 14.5GHz filter.
Recent drive in RF/microwave industries towards higher operating frequencies and complex designs, coupled with corporate pressures like manufacturability-driven design and time-to-market, demand advanced computer aided design (CAD) tools for microwave and millimeter-wave circuits. Filtering is a key operation in most high-frequency applications. Dual-mode filters are attractive since they reduce the needfor number of resonators (or cavities) by a factor of two. Butterworth filters, in particular, provide a maximally flat response in the pass-band. In this paper, we present a CAD approach for design and tuning of dual-mode Ku-bandfilters.In the proposed approach, design and tuning are performed using an equivalent-circuit based in-house computer program and a full-wave EM solver. The approach is illustrated via design and tuning ofa 14.5 GHz Butterworth filter.
This paper presents bow-tie printed antenna design and simulation based on dipole antenna concepts and its simulation using FDTD method. The wideband response is obtained for this structure. Then IE3D software is used to implement three fractal shapes on the basic configuration. This antenna as a wideband solution is used in monolithic wireless communication applications that require multiresonance frequencies. These features can be improved by fractalizing the antenna. While the bandwidth of the antenna can be changed by different flare angles, its fractalizing controls the multiband feature without any significant change on the radiation pattern. Numerical and measurement results of the antenna radiation characteristics, including return loss and radiation pattern, are presented and compared for mode-2, mode-3 and mode-5 Sierpinski fractal shapes which is implemented on the basic CPW-fed bow-tie antenna. Numerical radiation patterns are obtained in resonance frequencies and selfsimilar property in return loss and radiation pattern is demonstrated.
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