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Two SIW bandpass filters (BPFs) are presented using rectangular cavities and loaded posts for 5.8GHz WLAN system using rectangular cavity and loaded posts. Except that both of them use two rectangular cavities to create a passband, they are different in setting the feed-line locations. In design, two loaded posts are introduced as inductive coupling elements to restrain the fundamental resonant mode...
A high-selectivity dual-band bandpass filter using a modified triple-mode resonator with two paralleled stubs is proposed. By adding a coplanar waveguide (CPW) structure into a microstrip dual-mode stepped-impedance resonator (SIR), the triple-mode resonator is achieved without significantly increasing the overall circuit size. Five transmission zeros are generated in the desired band so as to improve...
A microstrip triple-mode bandpass filter using a single patch-loaded cross resonator is reported in this work. First, a square patch is added at the center of a cross resonator, which separates the resonant frequencies of the first and second modes. Then, a pair of slots is etched into the square patch, which splits the first pair of degenerate modes. By appropriately adjusting the patch size and...
A slotted circular patch resonator is proposed to design a dual-mode dual-band bandpass filter in this work. Three sets of slots are etched into a circular patch. First, four arc-oriented slots are etched to lower the TM01 mode resonant frequency. Then, four radial-oriented slots are etched from the edge of the circular patch to bring down the resonant frequency of the TM21 mode. By changing these...
This paper deals with the proposal, design and implementation of a class of compact dual- and triple-band bandpass filters with two transmission poles in each passband using a single microstrip ring resonator. Two methods are first presented to design two types of dual-mode dual-band bandpass filters using a single resonator. One is to synchronously excite the two pairs of the first and third-order...
A class of ultra-wideband bandpass filters using short-/open-stubs embedded ring resonator is discussed. The square ring resonator is first excited by two interdigital coupled-lines at two sides to achieve a triple-mode ultra-wideband bandpass filter performance. Two short-circuited stubs are then added to the upper and bottom sides of this square ring so as to constitute a quadruplet-mode bandpass...
A dual-mode dual-band bandpass filter with two transmission poles in both of dual-passbands is presented with the proper stub-loading and external-excitation of a single microstrip ring resonator. By placing two excited ports at the 135??-separated positions along a uniform ring resonator, two 1st-order degenerate modes, TM10 and TM01, can be simultaneously excited and they are split to produce two...
A class of triple-mode ultra-wideband (UWB) microstrip-line bandpass filters with improved upper-stopband performance and miniaturized size is proposed. Firstly, a mode graph of the initial triple-mode resonator is studied to choose its proper dimensions, aiming at allocating its first three resonant modes located within 3.1-10.6 GHz and its transmission zeros near its 5th-7th resonant modes. As a...
This paper aims to give unified characterization of coplanar-waveguide-based 1D electromagnetic-bandgap (EBG) and metamaterial in terms of two fundamental per-unit-length (PUL) transmission parameters, i.e., characteristic impedance and propagation constant. In analysis, a full-wave self-calibrated method of moments (MoM) is applied to de-embedding these two PUL parameters from simulation of two-port...
A class of ultra-wideband microstrip-line bandpass filters with improved out-of-band performance and miniaturized size is proposed and constituted using electromagnetic-bandgap (EBG) embedded multiple-mode resonator (MMR). This EBG- embedded MMR is at first studied, aiming to relocate its first three resonant modes within the 3.1-10.6GHz UWB passband while inhibiting its 5th resonant mode in the upper...
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