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This paper presents the design and simulation result of a miniaturized millimeter-wave bandpass filter realized by low temperature co-fired ceramic (LTCC) technology. The bandpass filter with a central frequency of 60 GHz and a 6 GHz pass-band is designed as a three-dimensional (3-D) structure based on distributed components. A distinct feature of this filter is the smaller size and lower in sertion...
In this paper, a compact and high selectivity dualband dual-mode microstrip bandpass filter (BPF) with source-load coupling is proposed using the short-stub-loaded folded SIR. Five transmission zeros can be generated near the passband edges and in the upper-stopband to improve the frequency selectivity and stopband performance, due to the main path signal counteraction and the folded arms of the resonator...
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...
In this paper an investigation of band-stop to all pass electronically reconfigurable filters that can utilize the same set of coupled resonators and switch the ideal pin diode to change between different modes of operation have been introduced. This filter is designed for this research and its main focus is to investigate, analyze, simulate and discuss on the proposed method using MATLAB®. The theoretical...
Novel dual-band band-stop filter coupling networks are introduced in the paper. Based on the topology, the design of dual-band, triple-band and four-band band-stop filters are firstly proposed and synthesized. The entire multi-band band-stop filter can be designed on the bases of several Chebyshev filters, which is easy to be realized with a good property. By using Substrate Integrated Waveguide (SIW),...
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 quad-band bandpass filter using double-layered structure has been presented. The proposed filter is principally composed of four pairs of stepped impedance resonators on the top metal layer and middle metal layer. In comparison to the conventional quad-band bandpass filters, the proposed filter has the advantages of compact size and wide-stopband response. Besides, due to multi-path effect, transmission...
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...
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...
A new generalized multiple-mode ring resonator configuration is proposed for bandpass filter design. The building block is a shorted half-wavelength ring. A quintuple-mode ring resonator bandpass filter is implemented for demonstration. Its entire circuit area is only 72% of that of a conventional dual-mode ring resonator. Coupling matrix method is employed for determining the inter-resonator coupling...
A novel compact microstrip dual-band filter with an adjustable transmission zero is proposed in this paper. The filter mainly consists of a microstrip stub-loaded dual-mode resonator and a half-wavelength resonator, and both are folded to make a compact configuration. The center frequencies of the two passbands are determined by appropriately choosing the impedance ratio of the stub-loaded dual-mode...
We have proposed an ultra-narrow band tunable superconducting filter with constant bandwidth and same transmission zero points for X-band RF applications. This tunable filter tuned center frequency by dielectric rods with actuator. At the same time, coupling coefficients and external Q of the filter change with individual gradient. This filter realized constant bandwidth and same transmission zero...
A new structure for realizing multi-stage directional filter is proposed in this paper. Instead of relying on one-stage directional filter as the building block, this approach relies on stand-alone band-reject filters. In this paper we investigate the viability of this idea by developing a three-stage directional filter prototype with elliptic response and 5.5% bandwidth. It is demonstrated that the...
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 compact microstrip rat-race coupler with fourth-order bandpass response has been proposed in this paper. In this study, the dual-mode stub-loaded resonators are used as the building blocks of the proposed structure. Thus, the proposed rat-race coupler with fourth-order bandpass response can be implemented with only four resonators, resulting in a small circuit size. All measured results are in good...
Substrate Integrated Waveguide (SIW) provides a better Q-factor compared with the other planar techniques. Its integration capabilities and fabrication cost are other benefits that make it attractive. But SIW filters are bulkier than their equivalents achieved in microstrip technology. This paper reports on the association of two solutions to reduce size and make SIW even more attractive: LTCC technology...
Recently a new systematic design rule was proposed to realize high-order UWB bandpass filters using cascaded E-shape microstrip structures. The responses of these miniaturized filters show one transmission zero at the upper stop-band. In order to improve the selectivity at the lower stop-band, this paper proposes a new generation of miniaturized high-order UWB bandpass filters having an attenuation...
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...
Based on stepped-impedance resonators (SIRs), a trisection filter is proposed to create a pair of real or imaginary zeros. Such zeros are useful to implement quasi-elliptic or flat group-delay response. Y-parameters are formulated for deriving the equivalent circuit. It is found that the sign of Y13 above and below the center frequency can be opposite, leading to a pair of zeros. Two more zeros are...
A measurement method for wireless power transfer (WPT) system with 0-ohm source impedance is shown. WPT systems are often designed by the BPF design theory and a vector network analyzer (VNA) is normally used for measurement. Here, some difficulty comes up for 0-ohm system that is common for high-efficient switching power sources. This paper describes the transmitted power and the transmission efficiency...
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