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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) - Compact Broadband Dipole Antenna with Split Ring Resonators
摘要： A compact broadband low-profile dipole antenna with split ring resonators (SRRs) is presented. The antenna is composed of a conventional dipole element and two SRRs. Each arm of the printed dipole is enclosed by a printed SRR to provide the favorable electromagnetic environment for coupling. Three modes are generated, which interact together to provide broadband characteristics, covering 1.45 GHz to 2.49 GHz (|S11| < ?10 dB bandwidth of 52.79%). The antenna is computationally demonstrated to have broadband characteristics and stable gain with symmetric radiation patterns. The compact antenna with overall dimensions of 10.2 mm × 74.6 mm × 0.508 mm (0.067λo × 0.489λo × 0.0033λo at 1.97 GHz) has a radiation efficiency > 90%. The compact size, simple structure, and stable radiation properties of the antenna increase its suitability for many wireless communication applications.
关键词： broadband,split ring resonators,dipole antenna,compact,wireless communication
更新于2025-09-09 09:28:46
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Pinning Transition of Bose-Einstein Condensates in Optical Ring Resonators
摘要： We experimentally investigate the dynamic instability of Bose-Einstein condensates in an optical ring resonator that is asymmetrically pumped in both directions. We find that, beyond a critical resonator-pump detuning, the system becomes stable regardless of the pump strength. Phase diagrams and quenching curves are presented and described by numerical simulations. We discuss a physical explanation based on a geometric interpretation of the underlying nonlinear equations of motion.
关键词： dynamic instability,pinning transition,optical ring resonators,Bose-Einstein condensates
更新于2025-09-09 09:28:46
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Automatic Monitor-Based Tuning of an RF Silicon Photonic 1X4 Asymmetric Binary Tree True-Time-Delay Beamforming Network
摘要： Photonic beamforming networks are promising candidates to achieve power-efficient transmission in future cellular communication systems. However, sensitivity to process and temperature variations necessitates an automatic calibration solution to enable robust operation. This paper demonstrates fully automatic monitor-based tuning of an integrated optical ring resonator-based 1X4 asymmetric binary tree optical beamforming network (OBFN). The proposed monitor-based tuning algorithm compensates fabrication variations and thermal crosstalk by controlling micro-heaters individually using information from electrical monitors. This algorithm is demonstrated on an OBFN that operates at 30 GHz with 2 GHz bandwidth and is fabricated in a standard silicon photonics foundry process. Successful calibration of the OBFN from a severely degraded initial response to the well-defined group delay responses required for a targeted radiating angle over 60? (?30? to 30?) in a linear beamforming antenna array is achieved. This fully automatic tuning approach opens the possibility of employing silicon OBFNs in real wideband mm-wave wireless communication systems.
关键词： optical ring resonators,thermal crosstalk,photonic integrated circuits,phased arrays,RF photonics,optical beamforming,true time delays,Microwave photonics
更新于2025-09-09 09:28:46
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[IEEE 2018 International Conference on Wireless Communications, Signal Processing and Networking (WiSPNET) - Chennai, India (2018.3.22-2018.3.24)] 2018 International Conference on Wireless Communications, Signal Processing and Networking (WiSPNET) - Dual-band Bandpass Filter Using Complementary Split Ring Resonators for X-Band Applications
摘要： This paper is focused on Complementary Split Ring Resonator (CSRR) to design a dual band bandpass filter (BPF) for X-Band frequencies using metamaterial concept. To achieve the functionalities of metamaterials, rectangular shaped complementary split ring resonators are etched in the ground plane along with λ/4 microstrip lines on the top. The inner and the outer rings are joined at the center through a gap. The length of the inner ring and the outer ring are calculated to make the BPF operating at 8.2 GHz and 9 GHz in X-Band. The width of the inter-connecting gap is changed to control the passband edges. An equivalent circuit model is proposed for the designed dual-band BPF to understand the working of the basic cell along with a microstrip line. By varying the length and width of the CSRR and changing the microstrip line dimensions two resonances are can be adjusted and finally fixed at our desired resonating frequencies. The results of EM simulation and the circuit simulation are compared to confirm the validity of the proposed design.
关键词： Bandpass filter,Complementary Split Ring Resonators,Dual-band filter,Metamaterials
更新于2025-09-09 09:28:46
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[IEEE 2018 International Conference on Advances in Computing, Communications and Informatics (ICACCI) - Bangalore, India (2018.9.19-2018.9.22)] 2018 International Conference on Advances in Computing, Communications and Informatics (ICACCI) - Compact Tunable Dual-band Bandpass Filter using Edge-open Split Ring Resonators for X-Band Applications
摘要： In this paper, a dual-band bandpass ?lter(BPF) is designed using edge-open Split Ring Resonators(SRR) which is obtained by modifying the conventional SRRs. The inner ring and the outer ring of the edge-open SRRs are connected to stubs to get dual passbands with improved ?lter characteristics. The rings of the SRR are loaded with varactor diodes to tune the individual passbands of the proposed BPF. The ?rst passband can be tuned independently by varying the capacitance of the varactor diode D1 while the second passband remains unchanged by ?xing the capacitance of the varactor diode D2 and vice versa. Hence, the proposed ?lter helps in tuning both the passbands independently of about 0.6GHz for the ?rst passband & 0.3GHz for the second passband and achieves compactness in size of about 20mm x 14mm. The ring equivalents of each rings and the obtained S-parameter results of the proposed BPF while tuning the individual passbands are discussed in this paper.
关键词： Split Ring Resonators,Varactor Diodes,Tunable ?lter,Metamaterials,Dual band bandpass ?lter
更新于2025-09-09 09:28:46
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BANDPASS FILTERS WITH IMPROVED SELECTIVITY BASED ON DUAL-MODE RING RESONATORS
摘要： Two novel microstrip bandpass ?lters with improved selectivity based on dual-mode ring resonators are proposed. Tow and four transmission zeros close to the passband are realized to improve the selectivity for the passband. Sixth-order passband is realized with two open/shorted stubs and a dual-mode ring resonator. The transmission zeros near the passband can be adjusted conveniently by changing the characteristic impedances of the coupled lines. For demonstration, two planar bandpass ?lters (3-dB bandwidths 20.9%, 20.2%) are designed and fabricated.
关键词： dual-mode ring resonators,transmission zeros,microstrip bandpass filters,selectivity
更新于2025-09-04 15:30:14
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Second Harmonic Light Manipulation with Vertical Split Ring Resonators
摘要： The second harmonic generation (SHG) of vertical and planar split-ring resonators (SRRs) that are broken centro-symmetry configurations at the interface of metal surface and air is investigated. Strong interactions, better electromagnetic field confinements, and less leakage into the substrate for vertical SRRs are found. Experimental results show a 2.6-fold enhancement of SHG nonlinearity, which is in good agreement with simulations and calculations. Demonstrations of 3D metastructures and vertical SRRs with strong SHG nonlinearity majorly result from magnetic dipole and electric quadrupole clearly provides potential applications for photonics and sensing.
关键词： nonlinear plasmonics,vertical split ring resonators (VSRR),second harmonic generation
更新于2025-09-04 15:30:14