Substrate-integrated waveguide (SIW) technology represents an emerging and very promising candidate for the development of circuits components operating in microwave millimetre-wave region. SIW structures are generally fabricated by using two rows conducting cylinders or slots embedded a dielectric substrate that connects parallel metal plates, permit implementation classical rectangular planar form, along with printed circuitry, active devices antennas. This study aims to provide overview...

Knowledge of the dielectric properties human tissues is important for several biomedical applications, including imaging and hyperthermia treatment, as well determining safety thresholds in policy making. Breast tissues, both normal tumorous, are particular interest because medical social impact breast cancers. While experimental data available up to 20 GHz, higher frequencies, this information missing, or has been extrapolated from models based on lower-frequency data. Emerging technologies...

This paper presents a general overview of substrate integrated transmission lines, from the perspective historical background and progress guided-wave structures their impacts on development microwave circuits integration solutions. is highlighted through technology roadmap involving categorized five generations circuits. In particular, technologies are reviewed discussed with focus technical features, design highlights, component developments, evolution, systems integration. A number...

A novel substrate integrated coaxial line (SICL) is presented and experimentally verified in this paper. This structure exhibits unimodal operation over a wide frequency band, shielded not dispersive, can be fabricated by using simple, low-cost thin-film process, easily with active devices. Moreover, the same technology results particularly suitable to realize passive components for wideband applications. The design of Lange coupler bandwidth 66%, used multi-port impulse radio ultra band...

This paper presents the modeling of lossy substrate integrated waveguide interconnects and components by using boundary integral-resonant mode expansion method. The extension numerical technique to account for conductor, dielectric radiation losses is discussed. Moreover, a systematic investigation different contributions loss their dependence on some geometrical parameters performed in case components, aiming at minimizing losses. physical explanation effects also provided. Finally,...

A novel frequency selective surface based on substrate integrated waveguide technology (SIW) is proposed and studied theoretically experimentally. Its primary function the selection of a linear polarization an incident wave its 90-degree rotation in given band. The structure SIW cavity, coupled to input output by two orthogonal slots, designed using simulation code method moments boundary integral-resonant mode expansion method, especially developed for accurate characterization FSS...

A novel wearable substrate integrated waveguide antenna fabricated entirely from textile materials is presented. The cavity-backed slot operates in the 2.45 GHz industrial, scientific and medical band, for short range communication between rescue workers. prototype of was tested: good performance obtained terms input matching radiation pattern. Moreover, measurements performed on after bending integration into clothing indicate high robustness against deformation low influence human body...

This paper presents a systematic investigation of quarter-mode filters in substrate integrated waveguide (SIW) technology. class is particularly convenient because it combines the features SIW structures with improvement size reduction. After thorough analysis cavity, this different coupling mechanisms and feeding techniques for design filters: side corner are considered, highlighting advantages disadvantages two techniques. Novel filter topologies introduced, experimental verification...

This letter presents one of the first examples exploitation 3-D printing in fabrication microwave components and antennas. Additive manufacturing represents an enabling technology for a wide range electronic devices, thanks to its inherent features fast prototyping, reasonable accuracy, fully topologies, low cost. A novel printable flexible filament, based on NinjaFlex, has been adopted substrate printed patch antenna. NinjaFlex is recently introduced material with extraordinary terms...

This paper presents the design and fabrication of a broadband microstrip attenuator, operating at 1-20 GHz, based on few layer graphene flakes. The RF performance attenuator has been analyzed in depth. In particular, use as variable resistor is discussed experimentally characterized microwave frequencies. structure graphene-based integrates micrometric flakes deposited an air gap line. As highlighted experiments, film can range from being discrete conductor to highly resistive material,...

Inkjet-printing is a very promising technology for the development of microwave circuits and components. conductive silver nanoparticles on an organic flexible paper substrate introduced in this study. The characterised using T-resonator method. A variety passive active devices, as well complete inkjet-printed substrates are introduced. This work includes artificial magnetic conductor structures, integrated waveguide, solar-powered beacon oscillator wireless power transfer localisation,...

Although substrate integrated waveguide (SIW) technology is well established for the fabrication of microwave circuits on rigid printed circuit boards, and first implementations textile SIW antennas have recently appeared in literature, up to now, no complete set components has been presented. Therefore, this paper describes design, manufacturing, testing a new class wearable applications, implemented technology. After characterizing adopted fabrics material terms electrical properties, it...

Medical imaging currently relies on several techniques, including X-rays, magnetic resonance, and echography. However, these techniques exhibit drawbacks, alternative approaches are required. Microwave has been proposed as a possible solution, especially for breast cancer imaging. most of systems work with central frequency few gigahertz, this leads to suboptimum resolution, which can jeopardize the image quality. Millimeter waves provide superior resolutions, at cost lower penetration depth...

In view to the epochal scenarios that nanotechnology discloses, nano-electronics has potential introduce a paradigm shift in electronic systems design similar of transition from vacuum tubes semiconductor devices.Since low dimensional (1D and 2D) nano-structured materials exhibit unprecedented electromechanical properties wide frequency range, including radio-frequencies (RF), microwave provides an enormous yet widely undiscovered opportunity for engineering community.Carbon nanoelectronics...

This letter presents a novel microwave-based rotation sensor having wide dynamic range to detect and measure the angular displacement in terms of change resonant frequency. The proposed is based on microstrip technology, where rotor comprised complementary split-ring resonator (CSRR) placed ground plane line free rotate around its axis. mechanical CSRR determines cross coupling between CSRR, thus changing overall inductance. planar unloaded microwave sensor, working ISM band 5.8 GHz, quite...

This article presents a technique based on modified complementary split-ring resonator (CSRR) to detect angular displacement and direction of rotation with high resolution sensitivity over wide dynamic range. The proposed microwave planar sensor takes advantage the asymmetry geometry measures angle in terms change relative phase reflection coefficients. consists movable CSRR (the rotor) microstrip line circular defect ground plane stator). By selecting substrate material rotor thickness, can...

This letter presents a voltage-controlled tunable planar antenna based on few-layer graphene flakes. The consists of rectangular patch with shorted microstrip stub connected to the radiating edge, and pad located at input stub. proposed design exploits variation resistance by an applied bias voltage. Without any voltage, behaves almost as open circuit, not allowing current passing and, thus, voiding impact Increasing voltage reduces resistance, thus increasing through into results in...

This letter presents a voltage-controlled tunable attenuator based on few layer graphene flakes. The proposed structure exploits the variation of resistance with an applied bias voltage. consists microstrip line, connected to grounded metal vias through pads: when no voltage is applied, high and pads behave as open circuits, causing minimum attenuation. By increasing voltage, decreases, connecting microstrip, thus A prototype operating in frequency band from dc 5 GHz has been designed...

This letter presents a new filter, based on substrate integrated folded waveguide (SIFW) technology, which exhibits compact size and good out-of-band rejection. The filter is SIFW cavity, guarantees reduction, the rejection controlled by suppression tuning of high-order cavity modes. A detailed investigation mode spectrum presented, to illustrate operation principle design filter. interesting feature this possibility pass band return simply practically unaffected connection excitation ports....

This paper presents the design and implementation of a novel class substrate-integrated waveguide (SIW) filters, based on partially air-filled cavity resonators. Removing dielectric in portion SIW allows obtaining dual-mode cavities: such cavities represent doublet, used as building blocks filters. A thorough modal analysis resonant transmission lines' representation detailed study doublet permit to demonstrate full control operation frequency, pass bandwidth, spurious-free region, position...

This article presents a novel sensor for detecting and measuring angular rotation proximity, intended rapid prototyping machines. The is based on complementary split-ring resonator (CSRR) driven by conductor-backed coplanar waveguide (CBCPW). has planar topology, which makes it simple cost-effective to produce accurate in both physical quantities. two components, rotor stator: the first of these (the CSRR) can rotate around its axis translate along plane normal ground CBCPW. A detailed...

This article presents the implementation of a novel microfluidic sensor based on resonant cavity. The cavity is substrate integrated waveguide (SIW) technology and fabricated by using stereolithographic 3-D printing, which guarantees fast prototyping allows arbitrary geometry. proposed consists square an inner meander pipe provided with two openings, where liquid under test injected extracted, fed coaxial probe, represents microwave port circuit. S-parameter measurement retrieving...

A novel class of substrate-integrated waveguides (SIWs) is presented, based on the concept classical ridge rectangular waveguide, which permits design broadband, compact and low-loss integrated components interconnects. Two configurations are proposed. The former SIW, where structure in a dielectric substrate with top bottom metal layers, comprises two-sided rows full-height cylinders central row partial-height posts connected at their by strip. latter slab waveguide; this presents geometry...

A substrate integrated waveguide (SIW) cavity backed active slot antenna oscillator is proposed, the operation frequency of which can be tuned by means a properly connected varactor. The structure permits overcoming potential problems such as heat dissipation and unwanted surface wave modes in large array implementations, may provide better phase noise performance. use SIW technology cost-effective fabrication process simple implementation at millimetre-wave frequency, for radar...