By using a composite coupling structure for coplanar waveguide (CPW)/microstrip, a new dual-band bandpass filter (DBBPF) stacking inverted Y-shaped CPW resonators and rectangular ring resonators is proposed. Two resonant frequency bands are simultaneously excited by the CPW feed line. However, it can be convenient to tune individually. Several transmission zeros are realized to improve the sele...

R-regular Mth band filters are an important class of digital filters and are used in constructing Mth-band wavelet filter banks, where the regularity is essential. But this kind of filter has larger stopband peak errors compared with a minimax filter of the same length. In this paper, peak errors in stopband of R-regular 4th-band filters are reduced by means of superimposing two filters with su...

A novel design method for compact planar lowpass filter (LPF) with prominent roll-off rate and wide stopband suppression is proposed by using fragment-type structures (FTS) multi-bit scheme. The FTS has the potential to achieve higher LPF performance at optimization efficiency, without any prerequisite knowledge about pivotal needed in conventional designs. definition of implementation scheme a...

This paper proposes a new design of an electromagnetic interference wideband filtering power divider (FPD) with wide stopband based on the genetic algorithm (GA). A set data structures is constructed by describing corresponding connection method between basic units and their electrical parameters in three-port design. Then, GA used to find appropriate topology parameters, including isolation re...

In this brief, a harmonic-controlled substrate-integrated defected ground structure (SIDGS) resonator with tuning capacitor is proposed for the design of tunable filter. Such exhibits characteristic. The fundamental resonant frequency can be properly tuned, while spurious resonance controlled at much higher to achieve wide stopband. To verify principle, bandpass filter (BPF) designed and fabric...