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A half-mode substrate integrated waveguide (HMSIW) bandpass filter loaded with modified complementary split-ring resonators (CSRRs) is presented. The modified CSRR, realised by utilising horizontal–asymmetrical stepped-impedance (SI) structure in the conventional CSRR, can enhance the equivalent capacitance and inductance of the CSRR and consequently shift the resonant frequency downwards. Therefore,...
A quasi-elliptic function bandpass filter (BPF) based on parallel feed topology is presented. The parallel feed topology is realised by splitting the input/output port of the filter into two paths through a T-junction to excite a pair of resonators simultaneously. This configuration contributes to further improving the selectivity of the filter by introducing more transmission zeros (TZs) near the...
Two novel bandpass filters (BPFs) with the same structure but different bandwidth are presented in this paper, they are based on multilayered printed circuit boards. In this work, an H-shape coupling slot is used to realize hybrid coupling, two substrate integrated waveguide (SIW) cavities in different layers are used for resonators, and the coplanar waveguide (CPW) in input and output port is used...
In this paper, a compact bandpass filter using quarter-mode substrate integrated waveguide (QMSIW) cavities with mixed coupling is presented. The mixed coupling is realized by etching a coplanar waveguide(CPW) at the magnetic coupled neighborhood section of two cascaded QMSIW resonators, which introduces two transmission zeros at the lower and higher rejection band. The filter enjoys merits of good...
In this paper, a novel wideband bandpass filter is proposed using a stepped impedance stubs resonator and substrate integrated coaxial line (SICL) technology. The resonator produces three resonant frequencies and two attenuation poles near the edges of the passband, so a wide bandwidth and a sharp rejection can be obtained. A filter prototype with compact size is simulated and the results indicate...
In this paper, two bandpass power dividers (BPD), one using conventional quarter-mode substrate integrated waveguide (QMSIW) and the other using both QMSIW and defected ground structure (DGS), are presented. Compared with conventional substrate integrated waveguide (SIW) circuitry, QMSIW can contribute to a size reduction of nearly 75%. And DGS-loaded QMSIW can further improve the size miniaturization...
This paper presents a planar millimetre-wave (mmwave) band pass filter based on substrate integrated waveguide (SIW) and substrate integrated coaxial line (SICL) techniques. Four half wavelength mircrostrip resonators are imbedded in the SIW cavity to improve Q-factor. Due to the closed configuration which eliminates radiation loss, the filter presents a relatively low insertion loss. The proposed...
In the structure of inverted Microstrip with complementary split-ring resonator, a new type of compact bandpass filter is designed. Nematic Liquid Crystal is introduced in this structure. Through changing the applied voltage, the properties of liquid Crystal are also changed , and it is easy to adjust the center frequency of the bandpass filter. Arbitrary frequency bandpass filter is easier to be...
In this paper, two wideband bandpass filters are presented, which combines half mode substrate integrated waveguide (HMSIW) with a pair of face to face improved dumbbells defected ground structure (DGS) cells. The proposed DGS cell have a good sideband selectivity feature compared with the conventional dumbbell DGS . To validate the methodology, two filters, i.e., one-stage and three-stage,with center...
In this paper, a new conductor-backed coplanar waveguide (CBCPW) bandpass filter with U-slot defected ground structures (DGSs) is designed. Because of CBCPW structure, it is easy to be integrated with high frequency IC circuits and to do measurement work. The U-slot DGS not only provides a high Q factor, but also has a simple shape. Simulation shows that the filter has 2GHz 3dB bandwidth and 2.17-dB...
In this paper, a narrow band band pass filter based on LTCC process is designed to satisfy 60 GHz high data rate wireless communication. In this design, circle patch is used to create a 60 GHz resonant frequency instead of ring. Simulation shows that our design is narrow band-pass in the 60 GHz bandwidth and wide band-stop in the low and high frequency
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