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A Dual Linearly Polarized End-Fire Antenna Array for The 5G Applications
摘要： A dual linearly polarized antenna array with end-fire radiation at the 60-GHz band is proposed by combining two types of magneto-electric dipoles (ME-dipole) which operate in vertical polarization (V-pol) and horizontal polarization (H-pol) respectively. Based on the substrate integrated waveguide (SIW) structure, two kinds of ME-dipole are placed closely by sharing the same metallic post wall between them, achieving an element space of 0.77λ0. Besides, mutual coupling between the close elements is numerically analyzed and then suppressed by making modifications to the antenna structure. The proposed dual-polarized element achieves bandwidths of 26% and 32% (|S11| < -14 dB) for the V-pol and H-pol respectively. A 1×8 element array is designed, fabricated and measured. Good agreement is achieved between the measurement and simulation. For the V-pol excitation, a bandwidth of 21% is obtained and gain is up to 16.1 dB. For the H-pol excitation, the bandwidth is 18% and peak gain is 15.1 dB. Radiation patterns are stable over the operating frequencies with cross polarizations below -30 dB for both polarizations. The port isolation is very high above 45 dB. With all these advantages of dual polarization, end-fire radiation, stable gain and high port isolation, the proposed array is a potential candidate for the future 5G applications.
关键词： substrate integrated waveguide (SIW),end-fire radiation,Dual linear polarization,magneto-electric dipole (ME-dipole),high isolation
更新于2025-09-09 09:28:46
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Design of a real-time two-color interferometer for MAST Upgrade
摘要： A single chord two-color CO2/HeNe (10.6/0.633 μm) heterodyne laser interferometer has been designed to measure the line integral electron density along the mid-plane of the MAST Upgrade tokamak, with a typical error of 1 × 1018 m?3 (～2? phase error) at 4 MHz temporal resolution. To ensure this diagnostic system can be restored from any failures without stopping MAST Upgrade operations, it has been located outside of the machine area. The ?nal design and initial testing of this system, including details of the optics, vibration isolation, and a novel phase detection scheme are discussed in this paper.
关键词： electron density,phase detection,MAST Upgrade,vibration isolation,two-color interferometer
更新于2025-09-04 15:30:14
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[IEEE 2018 IEEE International Symposium on the Physical and Failure Analysis of Integrated Circuits (IPFA) - Singapore (2018.7.16-2018.7.19)] 2018 IEEE International Symposium on the Physical and Failure Analysis of Integrated Circuits (IPFA) - Characterization of Bandgap Engineering on Operative Transistor Devices by Spectral Photon Emission
摘要： In modern IC technologies, it is very common to use germanium enriched silicon in order to increase field effect transistor (FET) channel carrier mobility for high performance. The germanium content modifies the effective semiconductor band gap EG. Thus, the bandgap energy EG is an important technology performance parameter. EG can be obtained in an LED-like operation of electronic devices, requiring forward biased p-n junctions. P-n junctions in FETs are source or drain to body diodes, usually grounded or reversely biased. This investigation applies a bias to the body that can trigger parasitic forward operation of the source/drain to body p-n junction in any FET. Spectral photon emission (SPE) is taken here as non-destructive in operative method to characterize engineered bandgaps transistor devices, while the device remains fully functional. Proving this technique with the nominal silicon bandgap on an (unstrained) 120nm technology FET, the characterization capability for bandgap engineering is successfully demonstrated using SiGe:C HBT. In IC technology, Ge enriched silicon is recently often used to increase channel carrier mobility. As a next step, 14/16nm p-type FinFET devices have been investigated by applying a bias voltage to the body and thereby activating one of the body/diffusion p-n junctions in forward bias. By measuring the spectral distribution of emission intensity through the backside of the operating device with an InGaAs detector, EG of the engineered bandgap can be determined in the FinFETs as well, in case of the investigated p-type FinFETs to 0.84 eV. This opens a new path for contactless fault isolation by quantitative local determination of bandgap engineering.
关键词： Bandgap engineering,body diode,heterojunction bipolar transistor,body bias voltage,contactless fault isolation,parasitic operation,FinFET,germanium,MOSFET,p-n junction,bandgap characterization,spectral photon emission,SiGe,HBT
更新于2025-09-04 15:30:14
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ULTRA-WIDEBAND FOUR-WAY IN-PHASE MULTILAYER POWER DIVIDER WITH HIGH ISOLATION
摘要： A novel ultra-wideband four-way in-phase multilayer power divider based on the microstrip-to-slotline transition is proposed in this paper as a complemental slotline power divider with high isolation. Due to the introduction of three lumped isolation resistors, the isolations between output ports in the new structure have been improved. The design expressions have been derived by making use of odd-mode and even-mode method. Both simulated and measured results have proved that the proposed power divider has good impedance matching at all ports, high isolations between output ports, excellent amplitude and phase balance, as well as ?at group delay over the wide frequency range from 3.8 GHz to 11 GHz.
关键词： microstrip-to-slotline transition,high isolation,ultra-wideband,multilayer power divider,four-way in-phase
更新于2025-09-04 15:30:14
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Compact Dual-band Bow-tie MIMO Antennas with Fragment-type Isolation Structure
摘要： Compact dual-band bow-tie MIMO antennas with fragment-type isolation structure are presented. The proposed bow-tie MIMO antennas include both canonical structures defining the radiators and fragment structures isolator. In the design, MOEA/D-DE for defining the optimization of canonical structures and MOEA/D-GO for optimization of fragment structures are combined and iterated. After the compound optimization, both simulation and measurement show that the return loss is higher than 10dB and isolation is higher than 25dB in the dual bands of 2.45-2.75GHz and 3.35-3.9GHz. Based on the overall performance, the proposed array can be employed for MIMO wireless communication systems like WiMAX.
关键词： fragment-type isolation,dual-band antennas,multi-objective optimization
更新于2025-09-04 15:30:14
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Multilayer Balanced-to-Unbalanced Power Divider with Wideband Transmission Characteristic and Common-Mode Suppression
摘要： This paper presents a wideband multilayer balanced-to-unbalanced (BTUB) power divider consisting of three metallic layers with two substrate layers for inherent common-mode suppression. With very simple structure, the working mechanism of the proposed power divider is investigated through even- and odd-mode equivalent circuit analysis, and the designed procedure is also summarized. For demonstration, an example of wideband BTUB power divider is implemented through standard printed circuit board process. The bandwidth of 63% of the fabricated BTUB power divider can be obtained with the best differential-mode transmission coefficient of -3.45 dB. The isolation bandwidth of approximately 63% can also be achieved. Good agreement between the simulated and measured results is observed, where the measured -15 dB common-mode suppression bandwidth is about 95%. Besides, the performance is stable after adding the shielding cavity.
关键词： wideband,multilayer,isolation,power divider,Balanced-to-unbalanced
更新于2025-09-04 15:30:14
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - A Printed 4×4 MIMO antenna with high isolation for WLAN application
摘要： In this paper, a low profile printed four port MIMO antenna has been proposed. Four closely placed rectangular ring-shaped monopoles have been considered as radiating elements here. High isolation between the radiators has been achieved by connecting metallic strips between the feed lines of the adjacent radiating elements and one rectangular slot on the ground plane between radiators. The 10 dB impedance bandwidth of the antenna occupies the WLAN band within 5.65 – 6.05GHz with a maximum isolation greater than 30dB. A Peak gain of 3.5dB has been observed at the operating band. To further realize the diversity performances, essential matrices such as TARC, ECC, diversity gain and CCL have been evaluated.
关键词： ECC,MIMO,CCL,diversity gain,TARC,isolation
更新于2025-09-04 15:30:14
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[IEEE 2018 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - Chengdu, China (2018.5.7-2018.5.11)] 2018 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - Analysis of Phase Noise and Transmit/Receive Isolation Influence on FMCW-Radar Performance
摘要： The detection sensitivity of frequency modulated continuous-wave (FMCW) radar is limited by the phase noise performance of LO signal and the transmitter to receiver leakage. The influence of phase noise and transmit/receive isolation in target detection has been investigated in this paper. The developed system-level simulation model for FMCW radar with defined noisy oscillator has been built up to analysis the impact of phase noise and isolation. The analysis and simulation indicates that the noise skirt of large echo signal and leakage signal increase the noise floor to affect small target signal detection, and the relations between noise floor deterioration and distance, phase noise, isolation are obtained from the model simulation results, which provide useful design constrains for FMCW radar system.
关键词： transmit/receive isolation,system-level simulation,phase noise,noise floor,FMCW radar
更新于2025-09-04 15:30:14
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[IEEE 2018 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - Chengdu, China (2018.5.7-2018.5.11)] 2018 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - A CPW-Fed Ultra-Wideband MIMO Antenna with T-Shape Slot Ground
摘要： A CPW-fed ultra-wideband multiple input, multiple output (MIMO) antenna with T-shape slot ground having the overall size of 23.73 mm × 50.53 mm only, is presented in this paper. The proposed MIMO antenna consists of two orthogonally placed elliptic antenna elements excited by coplanar waveguide structures. The proposed MIMO antenna have 17dB high isolation for the whole operating band. The antenna operates from 3.2GHz to 8GHz. Furthermore, the T-shape slot has etched at ground of antenna. The T-shape slot not only further reduces the minimum operating frequency of the antenna but also expand the bandwidth about 8GHz.In this arrangement, the antenna operates from 3.1GHz to 15GHz. By inserting the parasitic strip between the two grounds, the antenna bandwidth expands from 3.1GHz to 16.8GHz.The observed isolation is from 17.3dB to the 20dB.
关键词： Ultra-wideband (UWB) antennas,high isolation,Multiple input multiple output (MIMO) antenna
更新于2025-09-04 15:30:14
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - A Wideband Multi-Beam Yagi based MIMO Antenna System with Multiple Parasitic Directors
摘要： A proof of concept design for splitting the single conventional beam of a Yagi antenna into multiple beams is presented by exciting the 3λg loop resonating mode as well as using multiple director elements. The proposed multiple-input-multiple-output (MIMO) antenna system is designed in a triangular con?guration, so that the adjacent beams do not cancel the effect of each other and to achieve orthogonal radiation patterns each covering 120o sector. The design has a minimum measured -10 dB bandwidth of 980 MHz (5.66-6.64 GHz) targeting the WLAN band. The board diameter of the MIMO antenna system is only 120 mm. It has a minimum front-to-back ratio (FBR) of 10 dB, gain of 3.8 dBi, and ef?ciency of 92%. The proposed MIMO antenna system has high port isolation of 30 dB and low envelope correlation coef?cient (ECC) value of 0.012 in the entire band of operation between all its elements.
关键词： port isolation,envelope correlation coefficient,MIMO,front-to-back ratio
更新于2025-09-04 15:30:14