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A novel design of compact microstrip diplexer, using coupled dual-mode open-loop resonators, is proposed. The main advantage in using dual-mode open-loop resonators is that a compact narrowband bandpass filter with high selective asymmetrical frequency response is easily realized. This property is explored to design diplexer for a system with two extremely close bands. A prototype diplexer operating...
We propose the improved configurations with dual-mode dual-square-loop resonators (DMDSLR) for quad-band applications. The resonant frequency equations of DMDSLR are introduced for simply designing quad-band bandpass filter (BPF). Resonant frequencies can be controlled by tuning the perimeter ratio of the square loops. To obtain lower insertion loss, higher out-of-band rejection level and wider bandwidth...
In this paper, a multiple-mode resonator (MMR) using localized substrate integrated artificial dielectric (L-SIAD) is proposed to construct a compact ultra-wideband (UWB) bandpass filter (BPF). Due to the electromagnetic bandgap (EBG) property of L-SIAD, this MMR provides a broad upper stopband for the BPF. Meanwhile, broadside coupled-lines are used to provide tight coupling and sharp skirt for the...
Tri-band bandpass filter using single open or short stub loaded resonators is presented in this paper. The second and the third resonant frequencies of the open stub loaded resonator can be flexibly controlled by tuning the length and impedance of the open stub, whereas the first resonant frequency is fixed. The first and the third resonant frequencies of the short stub loaded resonator can be flexibly...
A new configuration of wideband bandpass filter (BPF) with notched bands is presented. Proposed BPF is based on stepped-impedance resonator. By utilizing dual stepped-impedance resonators in folded topology a rectangular-ring resonator is formed. Two notched bands in the passband are achieved without using asymmetrical coupled lines. In other words, the filter configuration is capable of producing...
This paper describes a triple-resonance stacked spiral resonator (SSR) structure for designing very compact tripleband bandpass filters. The resonant frequencies of the proposed SSR structure can be determined by designing the spiral geometry and controlling the mutual coupling in a stacked structure. The triple passband bandwidths can then be determined by the spacing of different layer patterns...
A balanced microstrip diplexer integrating directional filter and UWB structures for electronic communications is presented. The proposed structure channelizes UWB and WiLAN bands at different ports in its differential-mode. Good noise attenuation is obtained for the common-mode operation. The prototype presents low dimensions and ease of fabrication, which add important characteristics for integration...
In this paper a new class of very simple waveguide filters composed of solely cylindrical posts having the same diameter is presented. In such filters a resonator composed of two cylindrical metal posts placed in antipodal position is used to create band-pass filtering functions having transmission zeros. In particular the first two resonant modes have been exploited: the mode resonating at the higher...
A notch band ultra-wideband bandpass filter with good out-of-band rejection, controllable and multiple transmission zeros in notch band and good inband performance is presented in this paper. A shunt short-circuited stub is used to build up the initial ultra-wideband skirt. A slot is then embedded into the short-circuited stub to achieve cross-coupled effects. This cross-coupled circuit can effectively...
We propose a bandpass filter miniaturized by the composite right-handed and left-handed(CRLH) zeroth order resonators(ZORs). A 5th-order bandpass filter form a cascaded triplet(CT) to have a significantly sharp skirt for high frequency selectivity. First, we design an in-line ZOR bandpass filter whose total size is nearly 0.2 of the parallel-edge coupled filter. Second, we create multiple transmission...
This paper presents a quad-band filter using centrally shorted-stub loaded resonators operated at the first and third passbands and stepped impedance resonators fixed at the second and fourth passbands. A special feed structure consisting of two stepped impedance lines is proposed, and a pair of parallel coupling lines is loaded at the center of the shorted-stub loaded resonators to enhance the couple...
Rüdiger Vahldieck has been one of the early pioneers in field-theoretical microwave filter design and optimization. His perspective of any multi-port as a filter has been evident in much of his later work and has led to new insights and innovative approaches in Computer-Aided Design of microwave and millimeter-wave components. Adopting Rüdiger's view, this paper treats the Veselago/Pendry Superlens...
A high performance, Ka-Band, dielectrically loaded dual mode cavity filter has been developed. It utilizes higher order HE12δ modes to achieve high Q factors, wide tuning range, and a large range of bandwidths. Similarity of the design with a more conventional HE11δ design results in high commonality of parts with Ku-band designs and thus lower cost.
This paper presents a wideband microstrip bandpass filter with wide stopband. To achieve the wide stopband, a multi-stub resonator is introduced. The proposed resonator features high design freedom and can provide multiple transmission zeros for good near-passband selectivity and deep stopband rejection. The resonator is investigated via transmission-line model and a bandpass filter is fabricated...
A theoretical filter-design-scheme is proposed for a wideband filter consisting of an compound parallel-coupled three-line unit. After revealing the work mechanism of the proposed three-line unit, the design formulae are derived correspondingly. To validate the proposed techniques, a wideband filter with a bandwidth of 3–5GHz (FBW:50%) is designed as an example. The measured frequency responses of...
“All the World is a Filter” is true today, but was it always so? The study of passive networks stemmed from the need to understand the performance issues associated with the early power grid at the beginning of the 20th century. Development of radio communication necessitated careful attention to parasitic elements and the limitations of simple representations of inductors, capacitors, etc. The evolution...
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...
A novel dual-band bandpass filter using a multi-mode resonator is presented in this paper. Two passbands for WLAN bands are realized based on a multi-mode resonator with three open stubs. By appropriately selecting the characteristic impedance of the multi-mode resonator, the bandwidth of the two-order passband with even/odd-modes can be adjusted. In addition, the even/odd-modes frequencies can be...
In this paper, a novel control scheme to mitigate the grid current distortion due to grid voltage disturbance is proposed for a grid-connected voltage-source converter (VSC) with inductor-capacitor-inductor (LCL) filters. Voltage unbalance and harmonics in three-phase systems cause the DC-link voltage ripples and the grid current distortion. In order to mitigate the input current distortion and the...
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