High-performance narrowband superconducting filters with high Q resonators at X-band

2014 ◽  
Vol 56 (7) ◽  
pp. 1516-1520 ◽  
Author(s):  
Xiaoke Song ◽  
Bin Wei ◽  
Bisong Cao ◽  
Xiaoping Zhang ◽  
Xubo Guo ◽  
...  
Keyword(s):  
High Performance ◽  
High Q ◽  
X Band ◽  
Superconducting Filters

scholarly journals Ultrathin, Lightweight, and Flexible CNT Buckypaper Enhanced Using MXenes for Electromagnetic Interference Shielding

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Rongliang Yang ◽  
Xuchun Gui ◽  
Li Yao ◽  
Qingmei Hu ◽  
Leilei Yang ◽  
...  
Keyword(s):  
Electromagnetic Interference ◽  
High Performance ◽  
Electronic Devices ◽  
Deposition Process ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Emi Shielding Effectiveness ◽  
X Band ◽  
Wearable Electronic Devices ◽  
Emi Se

AbstractLightweight, flexibility, and low thickness are urgent requirements for next-generation high-performance electromagnetic interference (EMI) shielding materials for catering to the demand for smart and wearable electronic devices. Although several efforts have focused on constructing porous and flexible conductive films or aerogels, few studies have achieved a balance in terms of density, thickness, flexibility, and EMI shielding effectiveness (SE). Herein, an ultrathin, lightweight, and flexible carbon nanotube (CNT) buckypaper enhanced using MXenes (Ti3C2Tx) for high-performance EMI shielding is synthesized through a facile electrophoretic deposition process. The obtained Ti3C2Tx@CNT hybrid buckypaper exhibits an outstanding EMI SE of 60.5 dB in the X-band at 100 μm. The hybrid buckypaper with an MXene content of 49.4 wt% exhibits an EMI SE of 50.4 dB in the X-band with a thickness of only 15 μm, which is 105% higher than that of pristine CNT buckypaper. Furthermore, an average specific SE value of 5.7 × 104 dB cm2 g−1 is exhibited in the 5-μm hybrid buckypaper. Thus, this assembly process proves promising for the construction of ultrathin, flexible, and high-performance EMI shielding films for application in electronic devices and wireless communications.

scholarly journals A High Q-Factor Outer-Frame-Anchor Gyroscope Operating at First Resonant Mode

Micromachines ◽  
2020 ◽  
Vol 11 (12) ◽  
pp. 1071
Author(s):  
Bo Jiang ◽  
Yan Su ◽  
Guowen Liu ◽  
Lemin Zhang ◽  
Fumin Liu
Keyword(s):  
High Performance ◽  
Microelectromechanical Systems ◽  
Resonant Mode ◽  
Low Noise ◽  
Silicon On Insulator ◽  
Q Factor ◽  
Wafer Level ◽  
High Q ◽  
Ring Structures ◽  
Static Performance

Disc gyroscope manufactured through microelectromechanical systems (MEMS) fabrication processes becomes one of the most critical solutions for achieving high performance. Some reported novel disc constructions acquire good performance in bias instability, scale factor nonlinearity, etc. However, antivibration characteristics are also important for the devices, especially in engineering applications. For multi-ring structures with central anchors, the out-of-plane motions are in the first few modes, easily excited within the vibration environment. The paper presents a multi-ring gyro with good dynamic characteristics, operating at the first resonant mode. The design helps obtain better static performance and antivibration characteristics with anchor points outside of the multi-ring resonator. According to harmonic experiments, the nearest interference mode is located at 30,311 Hz, whose frequency difference is 72.8% far away from working modes. The structures were fabricated with silicon on insulator (SOI) processes and wafer-level vacuum packaging, where the asymmetry is 780 ppm as the frequency splits. The gyro also obtains a high Q-factor. The measured value at 0.15 Pa was 162 k, which makes the structure have sizeable mechanical sensitivity and low noise.

scholarly journals On the Use of a New Class of Simplified Multi-Window Iris Notch in the Design of Ultra-Compact High-Rejection Waveguide Filters for Satellite Links

Electronics ◽  
2020 ◽  
Vol 9 (8) ◽  
pp. 1221
Author(s):  
Juan Luis Cano ◽  
Angel Mediavilla ◽  
Antonio Tazon
Keyword(s):  
High Performance ◽  
Symmetry Plane ◽  
Pass Band ◽  
Transmission Zero ◽  
New Class ◽  
X Band ◽  
Waveguide Filters ◽  
Field Symmetry ◽  
Insertion Losses ◽  
First Time

This work introduces a simplified multi-aperture iris notch suitable for designing waveguide filters having an extremely improved compactness/rejection ratio, regarding available solutions, and adequate pass-band performances. The proposed iris architecture, analyzed for the first time, exhibits a unique transmission zero in the waveguide mono-mode bandwidth which can be easily located below or above the pass-band. The frequency of this transmission zero is evaluated in terms of the iris dimensions thus providing useful guidelines for designing filters with suitable responses. As a consequence of this simplified topology, any designed filter can be easily manufactured by cutting along its E-field symmetry plane. This strategy greatly improves the filter’s insertion loss regarding classical implementations based on more complicated arrangements with piled thin metallic sheets. Two exemplary filters have been designed and tested to be used in a high-performance X-band SATCOM terminal with an 80% size reduction with respect to the existing systems. Both filters covering the Rx (7.25–75 GHz) and Tx (7.9–8.4 GHz) sub-bands show a reflection of −25 dB with insertion losses below 1 dB in the pass-band, whereas they present a very sharp out-of-band rejection of at least 90 dB, that is, a 600 dB/GHz slope at X band.

A metamaterial-inspired high-Q X-band oscillator

2012 ◽  
Author(s):  
Kyoung Youl Park ◽  
Nophadon Wiwatcharagoses ◽  
Premjeet Chahal
Keyword(s):  
High Q ◽  
X Band

Cost-Effective High-Performance Monolithic X-Band Low-Noise Amplifiers

1986 ◽  
Vol 34 (12) ◽  
pp. 1553-1558 ◽  
Author(s):  
D.C. Wang ◽  
R.G. Pauley ◽  
Shing-Kuo Wang ◽  
L.C.T. Liu
Keyword(s):  
High Performance ◽  
Cost Effective ◽  
Low Noise ◽  
Low Noise Amplifiers ◽  
X Band
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