- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
[IEEE 2018 48th European Microwave Conference (EuMC) - Madrid, Spain (2018.9.23-2018.9.27)] 2018 48th European Microwave Conference (EuMC) - Arbitrary Terminated Coupler with Tunable Negative and Positive Group Delay Responses
摘要： This paper presents a design of arbitrarily terminated coupler with tunable negative group delay (NGD) response and power division ratio. The proposed coupler provides tunable NGD through port 3 and 1 whereas positive group delay (PGD) through port 2 and 1. The analytical analysis shows that the power division ratio and NGD are controlled by a junction resistance of parasitic compensated PIN diode. Perfect matching and infinite isolation are obtained at the center frequency (f0). The proposed coupler is validated by fabricating circuit at f0 = 2.14 GHz. Measurement results are well agreed with simulated and predicted results. The experimental results show that NGD is varied from -0.2 to -1.3 ns with NGD fractional bandwidth (bandwidth of GD < 0) of 21.14 % to 15.88%.
关键词： positive group delay,tunable wideband negative group delay,parasitic compensated PIN diode,Arbitrarily terminated coupler
更新于2025-09-09 09:28:46
-
A Low-Cost Compact Planar Dual-Band 3?dB Branch Line Coupler Using an Unbalanced CRLH
摘要： In this work, a compact dual-band 3 dB branch line coupler (BLC) is designed with center frequency at 2.45 GHz and 5.08 GHz using an unbalanced composite right/left-handed transmission line. Based on the two-port ABCD parameters, the lumped equivalent circuit of the proposed TL is extracted and optimized to obtain characteristic impedance at 2.45 GHz and 5.08 GHz. The right- and left-handed characteristics of the proposed TL are examined. Incorporating the proposed TL, a dual-band BLC with 0.29λg × 0.3λg size is obtained. The frequency response has magnitude imbalance of 0.8 dB, phase imbalance of 1.8° and 160 MHz bandwidth at 2.45 GHz and magnitude imbalance of 0.81 dB, phase imbalance of 0.006° and 100 MHz bandwidth at 5.08 GHz.
关键词： Branch line coupler (BLC),CRLH TL,Dual band,Unbalanced CRLH TL,Open stub,Interdigital capacitor
更新于2025-09-09 09:28:46
-
U-shaped Microfiber Coupler Coated with Polyvinyl Alcohol Film for Highly Sensitive Humidity Detection
摘要： A probe-type relative humidity (RH) sensor was proposed and developed by combination of a U-shaped microfiber coupler (MFC) and a polyvinyl alcohol coating. Optical MFC is considered as an excellent kind of humidity sensor due to its highly sensitive to the environmental RI changes. By covering one layer of PVA film onto the surface of the waist region of the MFC, the sensitive of the proposed sensor was further increased. Experiment results indicated that the proposed sensor exhibited a good linear relationship between the wavelength and relative humidity over the 15% to 85%RH range and which also exhibited sensitivity are about 318.1 pm/%RH. And temperature experiment results showed that the temperature sensitivity of the proposed sensor is about 13.9 pm/℃ over the 20℃ to 50℃ rang, which indicated that the proposed sensor has the performance of being low temperature sensitive.
关键词： temperature insensitive,humidity detection,PVA film,highly sensitive,U-shaped microfiber coupler
更新于2025-09-09 09:28:46
-
Cavity model-based analysis of field propagation in a six-port Riblet-type directional coupler
摘要： A cavity model-based analysis of electric field propagation inside a six-port Riblet-type directional coupler has been presented in this paper. Though cavity modeling technique is not very new and was previously applied to different rectangular waveguide-based passive networks to find their network parameters, for the first time it has been used here to analyze the field propagation inside a six-port Riblet-type directional coupler. From the analysis, the frequency response of the network has been estimated. Since the main objective of this work is to analyze the field propagation inside a passive network, not to present another network, a six-port Riblet-type directional coupler that is already proposed in literature has been considered. The numerical analysis has been verified by comparing the scattering parameters data obtained from the cavity model analysis with CST Microwave Studio simulation data and measured data available in the literature.
关键词： Riblet-type directional coupler,cavity modeling technique,Aperture field distribution,method of moment,scattering parameters
更新于2025-09-09 09:28:46
-
Miniaturized Wideband Coupler for 60-GHz Band in 65-nm CMOS Technology
摘要： A compact and wideband coupler for the 60-GHz frequency band applications using 65-nm CMOS technology is presented. By meandering the coupled line, a miniaturized coupler can be obtained. The proposed coupler achieves a measured insertion loss between the input port and the through port (S21) of 6.3 dB and between the input port and the coupled port (S31) of 5.6 dB at 60 GHz. The measured amplitude imbalance and phase difference are 0.75 dB and 92°, respectively, at 60 GHz. Overall, the proposed coupler can achieve a measured amplitude imbalance of <1 dB, phase imbalance of <4°, return loss, and isolation better than 13 and 20 dB, respectively, from 50 to 67 GHz. In addition, the proposed coupler occupies a core area of only 156 μm × 157 μm (0.024 mm2).
关键词： millimeter wave,60 GHz,coupler
更新于2025-09-09 09:28:46
-
[IEEE 2018 IEEE Photonics Conference (IPC) - Reston, VA, USA (2018.9.30-2018.10.4)] 2018 IEEE Photonics Conference (IPC) - Modeling and Analysis of SOI Grating Coupler for Bio-sensing Applications
摘要： This work presents, analysis of SOI optical grating structure operating at 1310 nm wavelength. Power coupling analysis between optical source and grating structure is done. The maximum power coupling efficiency of 55.2% is achieved for 500nm grating pitch having 50% duty cycly on 220nm Si-layer.
关键词： Broadband wavelength,Injection angle,Grating coupler,Multi beam,bio-sensor
更新于2025-09-05 23:14:25
-
[IEEE 2018 IEEE Radio and Antenna Days of the Indian Ocean (RADIO) - Mauritius (2018.10.15-2018.10.18)] 2018 IEEE Radio and Antenna Days of the Indian Ocean (RADIO) - Five-Stub Directional Device with Substantially Reduced Overall Dimensions
摘要： In this paper, a compact design of a five-stub microstrip coupler with significantly reduced overall dimensions has been investigated. To reduce the size, an artificial transmission line was used, with equivalent characteristics at a central operating frequency of 1000 MHz and in its vicinity, with the characteristics of an even-wave-length segment. Using the program of electrodynamic modeling AWR DE, a standard and compact coupler design was simulated. Due to the fact that the artificial line is shorter and the protruding elements are located, so that to maximally use the free space of the coupler without crossing with neighboring conductive lines from other lines, it was possible to reduce the area of the traditional coupler by 70% in relation to the area of the standard design, while the reduction in the band of operating frequencies occurred by 10%.
关键词： five-stub coupler,microstrip coupler,AWR DE,miniaturization,artificial transmission line
更新于2025-09-04 15:30:14
-
A NEW MINIATURIZED MICROSTRIP BRANCH-LINE COUPLER WITH GOOD HARMONIC SUPPRESSION
摘要： A new miniaturized microstrip branch-line coupler with good harmonic suppression is proposed in this paper. The new structure has two signi?cant advantages, which not only e?ectively reduces the occupied area to 20.4% of the conventional branch-line coupler at 0.96 GHz, but also has high 6th harmonic suppression performance. The measured results indicate that a bandwidth of more than 120 MHz has been achieved while the phase di?erence between S21 and S31 is within 90? ± 1?. The measured bandwidth of |S21| and |S31| within 3 ± 0.3 dB are 145 MHz and 150 MHz, respectively. Furthermore, the measured insertion loss is comparable to that of a conventional branch-line coupler. The new coupler can be easily implemented by using the standard printed-circuit-board etching processes and is very useful for wireless communication systems.
关键词： wireless communication systems,miniaturized microstrip branch-line coupler,harmonic suppression
更新于2025-09-04 15:30:14
-
Vertically symmetric broadband lumped element CMOS directional coupler
摘要： A vertically symmetric lumped element directional coupler (VSLEDC) providing broadband characteristics is proposed. In simulations, the proposed VSLEDC showed a 43.8% broader bandwidth than a horizontally and vertically symmetric lumped element directional coupler under similar design conditions for the same insertion loss. The proposed coupler was implemented in a Global Foundry 130 nm CMOS technology. The overall chip size was 1300 μm × 850 μm. The coupling was designed to be ?10 dB at 1 GHz. The S-parameter measurements showed an absolute bandwidth and a fractional bandwidth of 141.1 MHz and 14.11%, respectively. Within the bandwidth, the insertion loss was 1.6?1.8 dB.
关键词： lumped element,directional coupler,Vertically symmetric,broadband,CMOS
更新于2025-09-04 15:30:14
-
[IEEE 2018 International Conference on Broadband Communications for Next Generation Networks and Multimedia Applications (CoBCom) - Graz, Austria (2018.7.11-2018.7.13)] 2018 International Conference on Broadband Communications for Next Generation Networks and Multimedia Applications (CoBCom) - A Compact Ultra-Wideband Load-Pull Measurement System
摘要： This paper presents an oscilloscope based load pull measurement system for an ultra-wideband ranging chip. Such a system is intended to characterize a chips radio frequency circuits’ behavior under different operating conditions. The gathered measurement results should then be used for the optimization of the chips external circuitry, to reduce power consumption and improve pulse shaping. In this way we want to accomplish longer battery lifetime and higher ranging accuracy. By postprocessing the measurement results the de-embedding of the measurement circuitry is accomplished. Using verification measurements, we validate the performance of the measurement setup and the implemented postprocessing approach.
关键词： Oscilloscope,UWB,Ranging,De-Embedding,Signal Flow Graph,Load Pull,Directional Coupler
更新于2025-09-04 15:30:14