Generalized TM Dual-Mode Cavity Filters

Tomassoni, Cristiano; Bastioli, Simone; Sorrentino, R.

doi:10.1109/tmtt.2011.2172622

Cited by 102 publications

(82 citation statements)

References 11 publications

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“…Evolution of the dual-mode filter design techniques eventually led to a series of works on filters exploiting squareshaped cavities with two TM degenerate modes: TM 120 and TM 210 [10][11][12]; in these papers, it has been shown that a large variety of pseudo-elliptic responses can be obtained by connecting dual-mode cavities in series and through nonresonating nodes. Moreover, the TM-cavities have an important advantage: they are very compact in the direction of propagation and their compactness is only limited by required Q-factors and power handling.…”

Section: Introductionmentioning

confidence: 99%

Micromachined multilayer bandpass filter at 270 GHz using dual-mode circular cavities

Glubokov

Zhao

Beuerle

et al. 2017

2017 IEEE MTT-S International Microwave Symposium (IMS)

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Abstract-In this paper, we present a microfabricated fourthorder sub-THz WR-3.4 bandpass waveguide filter based on TM110 dual-mode circular-shaped cavity resonators. The filter operates at the center frequency of 270 GHz with fractional bandwidth of 1.85% and two transmission zeros are introduced in the upper and in the lower stopband using a virtual negative coupling. The microchip filter is significantly more compact than any previous dual-mode designs at comparable frequencies, occupying less than 1.5 mm 2 . Furthermore, in contrast to any previous micromachined filter work, due to its axially arranged interfaces it can be directly inserted between two standard WR-3.4 rectangular-waveguide flanges, which vastly improves system integration as compared to previous micromachined filters; in particular no custom-made split-block design is required. The cavities are etched in the handle layer of a silicon-on-insulator (SOI) wafer, and coupling is realized through rectangular slots fabricated in the SOI device layer. Couplings of the degenerate modes in one cavity are facilitated by means of small perturbations in the circular cavity shapes. The measured average return loss in the passband is -18 dB and worst-case return loss is -15 dB, and an insertion loss of only 1.5 dB was measured. The excellent agreement between measured and simulated data is facilitated by fabrication accuracy, design robustness and micromachined self-alignment geometries.

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Section: Introductionmentioning

confidence: 99%

Micromachined multilayer bandpass filter at 270 GHz using dual-mode circular cavities

Glubokov

Zhao

Beuerle

et al. 2017

2017 IEEE MTT-S International Microwave Symposium (IMS)

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“…High performance components in terms of losses are usually realized by using waveguide technology. A lot of effort has been devoted to mass and weight reduction for this technology [8]- [11], even in combination with high dielectric materials [12], [13]. The main problems remain their integrability.…”

Section: Introductionmentioning

confidence: 99%

Substrate Integrated Waveguide Cavity Filters: Miniaturization and New Materials for IoT Applications

Tomassoni¹,

Bozzi²

2017

RADIOENGINEERING

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“…In the last years, filters based on non-resonating modes have been successfully proposed in different configurations, for instance in combination with TM cavities [18], with resonant posts in a rectangular waveguide [19], or with highpermittivity dielectric pucks [20,21]. The non-resonating mode is a mode that resonates far away from the filter…”

Section: Introductionmentioning

confidence: 99%

Substrate-integrated waveguide filters based on mushroom-shaped resonators

Tomassoni

Silvestri

Bozzi

et al. 2016

Int. J. Microw. Wireless Technol.

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This paper presents a new class of quasi-elliptic pass-band filters in substrate-integrated waveguide technology, which exhibits compact size and modular geometry. These filters are based on mushroom-shaped metallic resonators, and they can be easily implemented using a standard dual-layer printed circuit board manufacturing process. The presented filters exploit nonresonating modes to obtain coupling between non-adjacent nodes in the case of in-line geometry. The resulting structure is very compact and capable of transmission zeros. In this work, the singlet configuration is preliminarily investigated, and a parametric study is performed. The design of three-pole, four-pole, and higher-order filters is illustrated with examples and thoroughly discussed. A four-pole filter operating at the frequency of 4 GHz has been manufactured and experimentally verified, to validate the proposed technique.Keywords: New and emerging technologies and materials, Filters I . I N T R O D U C T I O NThe deployment of a variety of novel applications in the framework of the wireless sensor networks (WSN) [1][2][3] and Internet of Things (IoT) [4][5][6] demands the development of novel classes of radio frequency (RF) and microwave components and antennas, which combine easy manufacturing, simple integration, low cost, compact size, limited loss, and low weight. Both WSN and IoT are expected to lead to the deployment of an extremely large number of wireless systems, which integrate passive and active components as well as antennas in a single, compact device. From a market point of view, the possibility to easily integrate an entire wireless system by adopting a cost-effective manufacturing process represents the key factor for the success and widespread development of these new applications.Among the available manufacturing and integration technologies for RF and microwave circuits, a good candidate able to satisfy all the aforementioned requirements is represented by the substrate-integrated waveguide (SIW) technology [7,8]. SIW technology permits to integrate in planar form waveguide-like components, by adopting a dielectric substrate with top and bottom ground planes and rows of metal cylinders to emulate the side walls of the waveguide. The fabrication of SIW structures can be based on wellestablished and low-cost manufacturing techniques, such as the standard printed circuit board (PCB) technology. SIW structures guarantee large design flexibility and easy manufacturing, combined with relatively low losses and selfpackaging. Moreover, SIW allows the simple integration with active and non-linear devices, as well as the implementation of complete circuits on a single substrate, according to the system-on-substrate (SoS) paradigm [9].Microwave filters represent a class of components very suitable for implementation in SIW technology. The main reason is related to the low losses of SIW structures, which are usually smaller than in other planar technologies (as the microstrip line or the coplanar waveguide): due to this feature, SIW...

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Generalized TM Dual-Mode Cavity Filters

Cited by 102 publications

References 11 publications

Micromachined multilayer bandpass filter at 270 GHz using dual-mode circular cavities

Micromachined multilayer bandpass filter at 270 GHz using dual-mode circular cavities

Substrate Integrated Waveguide Cavity Filters: Miniaturization and New Materials for IoT Applications

Substrate-integrated waveguide filters based on mushroom-shaped resonators

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