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This paper presents a compact bandpass filter based on stacked eighth-mode substrate integrated waveguide (EMSIW) resonators. By properly constructing the feeding and coupling topology of four EMSIW cavities, the proposed filter not only exhibits compact size, but also achieves enhanced selectivity by virtue of its three transmission zeros (TZs). A novel cross-coupled structure which contributes to...
This paper presents a novel filter based on an air-filled substrate integrated waveguide (SIW) cavity resonator. This structure is inspired by the air-filled SIW, recently proposed to realize integrated interconnects with reduces losses. The proposed resonant cavity allows introducing two poles and two transmission zeros in the frequency response of the filter. The size and position of the air-filled...
In this article, a way to design a quadruple-mode bandpass SIW filter with single circular cavity has been investigated. The proposed filter is implemented using slotting technology and has a simple and symmetrical structure. It focuses on the multiple-mode resonator (MMR) technology to miniaturize the overall size of a wide bandpass filter (BPF). Totally five metallic perturbation via and slots are...
In this work, a pass band SIW filters is described for the 36–39 GHz frequency range. The considered filter is realized by three SIW rectangular cavities which are coupled by via-hole irises. Compared with the simple SIW filter, the coupled cavities technique may be highly desirable to improve the rejection quality and to increase the bandwidth size of filter. The design theory is based on the LWCIP...
A four-pole substrate integrated waveguide (SIW) filter at Ka band is designed for satellite communication systems. The filter contains four SIW cavity resonators which are made of a substrate with metalized via holes. A transmission zero at the low-frequency side of the pass band is produced by the negative coupling that provided by TE102 mode in the second cavity resonator. The selectivity on the...
This paper presents an investigation on the size reduction of SIW microwave components, with particular reference to SIW cavity filters. The quality factor of miniaturized SIW cavities is investigated, by comparing the performance of standard, half-mode and quarter-mode SIW cavities. Two filters, based on half-mode and quarter-mode SIW cavities, respectively, are described and their experimental validation...
In this paper, a novel dual-mode substrate integrated waveguide resonator which is a square SIW cavity perturbed by a rectangle metallic plane inserted into the middle of the substrate. With this type of dual-mode substrate integrated waveguide cavity, a novel fourth-order bandpass filter is presented. The filter was fabricated and measured with high selectivity and compact size, and the size reduction...
A compact substrate integrate waveguide (SIW) balanced bandpass filter (BPF) with high selectivity as well as common-mode (CM) suppression is proposed in this paper. This filter is consist of two layers of substrate, which reduce the size by half. The negative electric coupling is achieved by circle coupling slots etched on the layer interface, resulting in quasi-elliptic filtering response. A four-order...
In this paper, the resonant frequencies of a dual mode square SIW cavity with a corner cut perturbation are calculated, analytically. Since introducing the perturbation makes small changes in the field pattern of this cavity, the perturbation theory can be used to calculate the resonant frequencies. Using this theory, the first degenerate modes of the dual mode cavity are calculated, approximately...
A guided-mode resonance (GMR) filter consists of a sub-wavelength grating in a thin film waveguide on a transparent substrate and shows a narrowband-stop filtering for an incident wave from air. A cavity-resonator-integrated GMR filter (CRIGF) provides GMR filtering with a miniaturized aperture by integrating a waveguide cavity formed by a pair of distributed Bragg reflectors. A combination of a CRIGF...
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 cross-coupled substrate integrated waveguide (SIW) filter with transmission zero is proposed. Using three triangular cavities as basic elements, a bandpass filter is designed and fabricated on a single-layer substrate with the standard printed circuit boards (PCB) process. This structure gives full expression to the advantages of compact SIW triangular cavity. Not...
A unit based on substrate integrated waveguide (SIW) cavity with folded defected ground structure (FDGS) split-ring resonator (SRR) etched on is introduced. The coupling between the SIW cavity and FDGS leads to two resonant frequencies and one transmission zero. By adjusting the size and the position of the FDGS SRR, both resonant frequencies and transmission zero can be controlled. The flexibility...
A new balanced dual-band bandpass filter (BPF) utilizing substrate integrated waveguide (SIW) technology is proposed in this paper. By wisely arranging TE102-mode SIW cavities on the symmetrical plane, the presented balanced BPF can realize selective differential-mode (DM) transmission and quite high common-mode (CM) suppression. In addition, by adopting the extracted-pole mechanisms simultaneously,...
Electroplating on dielectric is used to realize continuous metallic side walls of a substrate integrated waveguide (SIW). Thus the complexity of fabricating chain of metallic via using precise mechanical or laser drilling used in conventional SIW fabrication is avoided. To show effectiveness of the procedure, a single cavity dual-mode bandpass filter is designed and fabricated. A modified corner cut...
A negative-order cavity resonator (NOCR) using composite right/left-handed (CRLH) ridge substrate integrated waveguide (RSIW) is proposed and applied to the design of coupled-resonator filter. The NOCR is realized using the CRLH RSIW unit cell with two rows of metal walls to form a cavity structure. The CRLH characteristic of this cavity resonator produces the −1st resonance which occurs below the...
This paper presents a novel technique to design a dual-band bandpass filter by exploiting the second order degenerated modes of the SIW-cavity. The second order filter has been designed by using the proposed technique, at Ka-band of microwave frequencies; the ratio of two bands center frequencies — frequency ratio (FR) — is 1.073. Rogers RT/Duroid 5880 — with substrate height of 0.508mm — has been...
A compact wideband bandpass filter based on the half mode substrate integrated waveguide (HMSIW) is presented in this paper. Two double-slit complementary split-ring resonators (DS-CSRRs) are etched on the bottom plane, which can improve the out-of-band rejection. The microstrip line is used to feed the HMSIW cavity and DS-CSRRs. A bandpass prototype with the center frequency of 7.6GHz is designed...
A compact wide passband three-pole LTCC filter is presented; its electrical size is reduced by exploiting quarter substrate integrated waveguide (QMSIW) and eighth-mode SIW (EMSIW) cavities, which is smaller than conversional SIW. The filter is designed on multilayer ceramic, which make the filter further compact. The filter was simulated by full wave simulator. The simulated results show the filter...
This work presents a novel class of filters in substrate integrated waveguide (SIW) technology, based on a multilayered configuration. The peculiarity of these filters is the presence of additional poles and zeros, due to the resonant slot etched in the common metal layer between two dielectric substrates. In this way, a filter with two mono-modal cavities, coupled by a resonant slot, exhibits a frequency...
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