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3-D Printed Bandpass Filters With Coupled Vertically Extruded Split Ring Resonators
摘要： The additive manufacturing process of multimaterial extrusion offers performance advantages using functional materials including conductors while making accessible the third dimension in the design of electronics. In this work, we show that the additional geometrical freedom offered by this technique can be exploited for the design and realization of filters made of 3-D resonators that exhibit enhanced characteristics. The coupling properties of 3-D grounded square split ring resonators (SRRs) are initially explored. We demonstrate by simulations and experiments that SRRs with finite height display significantly stronger coupling compared to equivalent thin printed circuit structures. The observed trend can be exploited for designing filters with wider operational bandwidths for a given footprint, or miniaturized layouts and enhanced compatibility with fabrication limits for minimum feature size and spacing without performance degradation. This concept is demonstrated by presenting results of full-wave simulations for sample bandpass filters with identical footprint but formed by coupled 3-D square SRRs of different heights, showing that filters with taller resonators exhibit increasingly wider bandwidths. Two filter prototypes with center frequencies at 1.6 and 2.45 GHz are manufactured by multimaterial 3-D printing. The measured characteristics of these prototypes are found to be in good agreement with numerical simulations taking into account the effect of the lossier metallic and dielectric materials used in 3-D printing and confirm the predicted larger bandwidth of the filters made of 3-D SRRs with marginally higher insertion losses.
关键词： Additive manufacturing,resonance,split-ring resonators,filter design,fused deposition modeling (FDM),3-D printing,direct digital manufacturing (DDM),electromagnetic coupling
更新于2025-09-11 14:15:04
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Spontaneous Symmetry Breaking, Oscillations, and Chaotic Regimes in Bidirectionally-Pumped Ring Resonators
摘要： Spontaneous symmetry breaking has been recently demonstrated experimentally in bidirectionally-pumped dielectric microresonators [1,2]. This process is mediated by cross-phase modulation due to the Kerr nonlinearity. We present comprehensive analytical and dynamical models for this symmetry breaking, with novel results in both time-dependent and time-independent cases, including chaos. The time-dependent system is described by the following pair of dimensionless coupled equations: ˙e1,2 = ?e1,2 ? [1 + i(|e1,2|2 + 2|e2,1|2 ? Δ)]e1,2, wherein ?e1,2 are the (clockwise or counterclockwise) electric ?eld amplitudes sent to the cavity, e1,2 are the (clockwise or counterclockwise) electric ?eld amplitudes coupled into the cavity, and Δ is the normalised detuning of the laser with respect to the non-Kerr-shifted cavity resonant frequency. Above a symmetry-breaking threshold, in which the stationary amplitudes of the two ?elds are different from each other, the system is strongly susceptible to oscillations [3], implying periodic energy exchange between the two modes. Above a theoretically-determined value of input power, oscillations develop with observable amplitudes (see Fig. 1 for typical ranges of instability). At still higher values of input power, we observe more complicated time-dependent behaviour: the onset of period-doubling, whereby much more complicated waveforms, and ?nally chaos, emerge [3]. Numerical integration of Eqs. (1) con?rms the ranges of instability and frequencies of oscillation [3]. In addition to being of fundamental interest, this theory is relevant for many applications, such as optical diodes and logic gates, as well as opening up the possibility of constructing an all-optical oscillator. The rich time-dependent behaviour exhibited by this system suggests applicability to other devices, such as scramblers and random number generators, all within a compact form factor, such as a microresonator. Note that many of the results presented here are general with respect to changes in the coef?cients of self- and cross-phase modulation in Eqs. (1).
关键词： Spontaneous symmetry breaking,bidirectionally-pumped ring resonators,chaotic regimes,oscillations
更新于2025-09-11 14:15:04
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[IEEE 2019 International Topical Meeting on Microwave Photonics (MWP) - Ottawa, ON, Canada (2019.10.7-2019.10.10)] 2019 International Topical Meeting on Microwave Photonics (MWP) - Reconfigurable photonic RF filters based on integrated Kerr frequency comb sources
摘要： We demonstrate two categories of photonic radio frequency (RF) filters based on integrated optical micro-combs. The first one is based on the transversal filtering structure and the second one is based on the channelization technique. The large number of wavelengths brought about by the microcomb results in a significantly increased RF spectral resolution and a large instantaneous bandwidth for the RF filters. For the RF transversal filter, we demonstrated Q factor enhancement, improved out-of-band rejection, tunable centre frequency, and reconfigurable filtering shapes. While a high resolution of 117 MHz, a large RF instantaneous bandwidth of 4.64 GHz, and programmable RF transfer functions including binary-coded notch filters and RF equalizing filters with reconfigurable slopes are demonstrated for the RF channelized filter. The microcomb-based approaches feature a potentially much smaller cost and footprint, and is promising for integrated photonic RF filters.
关键词： Microwave photonics,micro-ring resonators
更新于2025-09-11 14:15:04
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Improving the performance of nanostructure multifunctional graphene plasmonic logic gates utilizing coupled-mode theory
摘要： Nanostructure ring resonators are suitable devices for photonic integrated circuits. A nano-scale multifunctional logic device based on plasmon-induced transparency (PIT) is presented here. This device consists of a pair of hexagonal ring resonators coupled with two parallel metal–insulator–metal (MIM) waveguides. According to the coupled-mode theory, the appropriate detuning between the resonances wavelengths of two resonators acts as the key factor to achieve the PIT phenomenon. For this purpose, the PIT phenomenon for several metals utilized in MIM waveguides is studied. Also, graphene has been employed as the replacement for the metal under the hexagonal ring resonator and its parallel waveguides. However, the interaction of light with graphene as a 2D material is weak, by varying the dimensions of waveguides, rings, and their distances, and also, incident light wavelength and graphene chemical potential, we have achieved the desired couplings in the structure. Finite-difference-time-domain (FDTD) simulations confirm that “1” and “0” logic states which represent the high and low levels of the optical power can be achieved at the through and drop ports by changing the refractive index. It has been demonstrated that the proposed structure implements the function of logical operations including XOR and XNOR, simultaneously.
关键词： Logical operations,Nanostructure ring resonators,Plasmon-induced transparency,Finite-difference-time-domain,Graphene,Metal–insulator–metal waveguides
更新于2025-09-11 14:15:04
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[IEEE 2019 IEEE 62nd International Midwest Symposium on Circuits and Systems (MWSCAS) - Dallas, TX, USA (2019.8.4-2019.8.7)] 2019 IEEE 62nd International Midwest Symposium on Circuits and Systems (MWSCAS) - Rapid Simulation of Photonic Integrated Circuits using Verilog-A Compact Models
摘要： With the advent of silicon-based integration of photonics, there is a growing interest in the electronic circuits community to develop hybrid electronic-photonic integrated systems. However, photonic integrated circuits (PICs) design tools have focused on the solutions of Maxwell’s equations using numerical methods. Recently developed PIC system-level design tools employ s-parameter modeling of optical components. in such platforms, accurate modeling of electronic However, driver and interface circuits is not supported. To allow electronic integrated circuit (IC)-centric design, there is a trend of compact modeling of photonic components using Verilog-A so that they can be co-simulated with CMOS electronics. In this work, we present our modeling approach and a novel method for rapid frequency-domain simulation of PICs.
关键词： Ring resonators,Verilog-A,Silicon Photonics (SiP),CMOS photonics,Photonic integrated circuits (PICs)
更新于2025-09-11 14:15:04
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Design of a Modified Single-negative metamaterial structure for sensing application
摘要： A new topology of modified negative effective permeability material (NEPM) are studied by adding a small similar form with different angles to the basic single split-ring resonators. we report our work conducted on the design, simulation and micro-fabrication of sensing system based on a modified split-ring resonator (MSRR) structure around 140 GHz operation frequency. Once the NEPM cells are excited, the reflection and transmission coefficients from the excitation mechanism can be measured by using quasi-optical technique with normal incidence. It has been shown that our proposal NEPM exhibits a high resonant frequency which is extraordinarily sensitive to the changes of the geometries and the properties of metal shape. By applying the new design of square Plus symbol (+) curve to the SRRs, more condensed size and higher sensitivity can be attained compared to conventional SRRs. Furthermore, the enhancement of sensitivity of the new design is also exposed. The considered sample double defect corner square modified form (DCD2) is fabricated in our lab using a conventional printed circuit board process with 2μm aluminum and validated by comparing simulated profiles with measurements.
关键词： sensors,Resonators,Metamaterial,Modified split ring resonators
更新于2025-09-10 09:29:36
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A NOVEL RECONFIGURABLE UWB FILTERING-ANTENNA WITH DUAL SHARP BAND NOTCHES USING DOUBLE SPLIT RING RESONATORS
摘要： This study presents a novel technique for designing an ultra-wideband (UWB) filtering-antenna with dual sharp band notches. This design is composed of a modified monopole antenna integrated with resonant structures. The monopole antenna is modified using microstrip transition between the feedline and the patch. In addition, block with a triangle-shaped slot is loaded on each side of the ordinary circular patch to produce wide bandwidth with better return loss and higher frequency skirt selectivity. The resonant structures are constructed using two double split ring resonators (DSRR) loaded above the ground plane of the antenna to produce dual band notches and filter out WiMAX (3.3–3.7 GHz) and HiperLAN2 (5.4–5.7 GHz) frequencies. The band notch position is controlled by varying the length of the DSRR. The reconfigurability feature is achieved by using two PIN diode switches employed in the two DSRR. The measured results show that the proposed filtering-antenna provides wide impedance bandwidth from 2.58 to 15.5 GHz with controllable dual sharp band notches for WiMAX and HiperLAN, peak realized gain of 4.96 dB and omnidirectional radiation pattern.
关键词： double split ring resonators (DSRR),dual sharp band notches,filtering-antenna,PIN diode switches,WiMAX,HiperLAN2,Ultra-wideband (UWB)
更新于2025-09-10 09:29:36
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[IEEE 2018 12th International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials) - Espoo, Finland (2018.8.27-2018.9.1)] 2018 12th International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials) - Reduction of the beam-coupling impedance in accelerating structures using metamaterial-based absorbers
摘要： Resistive-wall impedance constitutes a significant percentage of the total beam-coupling impedance budget of an accelerator. Under extreme conditions, like large power handling and ultra-high vacuum, metamaterial-based absorbers can represent a valid alternative to other approaches for impedance mitigation in specific accelerator components, like resonant (parasitic) cavities or collimators operating along the beam line. We design sub-wavelength 2D metallic resonant structures based on split rings or on 3D hyperbolic tapered waveguide arrays that can be employed as mode dampers in accelerating structures. A number of prototypes are fabricated and then measured in a “test model” pillbox cavity.
关键词： accelerators,hyperbolic metamaterials,metamaterials,beam-coupling impedance,split-ring resonators
更新于2025-09-10 09:29:36
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A compact dual-band bandpass SIW filter using uniplanar combination of the CRLH and resonant type metamaterials
摘要： A new manner of obtaining dual bandpass behaviour in substrate-integrated waveguide (SIW) using a uniplanar combination of composite right/left-handed (CRLH) transmission line and complimentary double split single ring resonator (CDSSRR) is presented and analysed in this paper. The proposed dual band structure has the advantage of miniaturisation due to the presence of both the passbands below the characteristic cuto? frequency of the SIW.A high passband transmission zero overcomes the poor frequency selectivity, and the two resonant frequencies are independently controllable. There are very low insertion losses in both passbands as compared to DGS structures and fabrication simplicity is ensured due to an intact ground. The potential for application of the proposed structure to the design of completely planar miniaturised dual band bandpass metamaterial ?lters has been veri?ed by fabricating a two-stage ?lter based on the proposed combination. The measured results are in good agreement with the simulation results.
关键词： band pass ?lter,complementary split-ring resonators (CSRRs),Metamaterials,Substrate-integrated waveguide (SIW),composite right/left-handed (CRLH),dual-band,miniaturised planar waveguide ?lters
更新于2025-09-10 09:29:36
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DUAL-BAND BANDPASS FILTER USING COMPOSITE COUPLING STRUCTURE FOR CPW/MICROSTRIP
摘要： By using a composite coupling structure for coplanar waveguide (CPW)/microstrip, a new dual-band bandpass ?lter (DBBPF) stacking inverted Y-shaped CPW resonators and rectangular ring resonators is proposed. Two resonant frequency bands are simultaneously excited by the CPW feed line. However, it can be convenient to tune individually. Several transmission zeros are realized to improve the selectivity of the ?lter and achieve wide stopband rejection. Good agreement between simulated and measured results demonstrates the validity of this DBBPF.
关键词： rectangular ring resonators,inverted Y-shaped CPW resonators,composite coupling structure,CPW/microstrip,dual-band bandpass filter
更新于2025-09-09 09:28:46