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Manos M. Tentzeris,Joy Laskar,Jong-Gwan Yook,Il Kwon Kim,Nickolas Kingsley,Matthew A. Morton,Stephane Pinel,John Papapolymerou 한국전자파학회JEES 2006 Journal of Electromagnetic Engineering and Science Vol.6 No.4
In this paper, the fractal shape is applied to microstrip band pass filters and integrated on a high-resistivity Si substrate to solve conventional 2<SUP>nd</SUP> harmonic problem. Conventional microstrip coupled line filters are popular in RF front ends, because they can be easily fabricated and integrated with other RF components. However, they typically have large second harmonics that can cause unwanted interference in interested frequency bands. Without any additional filters, the proposed Koch shape filters have suppressed the 2<SUP>nd</SUP> harmonics by about ?40㏈, so they can be used in systems such as direct conversion receiver with stringent harmonic suppression requirements.
Analytical Loss Modeling for MOSFET-based Modular High Frequency Converters
K. Manos,A. Antonopoulos 전력전자학회 2023 ICPE(ISPE)논문집 Vol.2023 No.-
In high switching frequency inverter applications besides conduction and switching losses, the contribution of incomplete soft-switching events to the total losses of the power converter can be significant. This paper presents an analytical loss model for Modular High-Frequency Converters (MHFC) that accounts for this kind of transitions as well. This is accomplished by taking into consideration the charging dynamics of the MOSFET output capacitance. Only parameters that are readily available in the datasheets of the devices are used. The derived equations are employed to evaluate several power MOSFETS for a 3-submodule 1 kW prototype MHFC, switching at 100 kHz. The proposed model confirms the key role of partial hard turn-on events, as well as it reveals the importance of proper dead-time selection, in terms of total converter losses. Experimental results are in agreement with the proposed model.
Share Liquidity and Market Microstructure Reform: The Case of Screen-based Trading in Mumbai
Ronny Manos,Christopher J. Green,Victor Murinde,Nathridee Suppakitjarak 한국증권학회 2010 Asia-Pacific Journal of Financial Studies Vol.39 No.3
We investigate the impact of the March 1995 move to screen-based trading on the Mumbai Stock Exchange, using separate samples of more liquid (A) and less liquid (B) shares. Following the move, the average cumulative abnormal return for A shares was 4.5%, whereas that for B shares was over 12%; market liquidity and efficiency increased but the effect on volatility was more ambiguous. We identify a significant cross-sectional relationship between the size of cumulative abnormal returns and firm-specific improvements in liquidity, efficiency, and volatility, with differences in the effects of reform on A and B shares.
Yunnan Fang,Manos M. Tentzeris 대한금속·재료학회 2024 ELECTRONIC MATERIALS LETTERS Vol.20 No.3
This work reports the fi rst demonstration that a chemoresistive sensor can be used to detect the aggregation pheromone offl our beetles. To prepare the sensing element of such a sensor, a novel functionalization method was developed to amplifyamine groups on the surface of carbon nanotubes (CNTs). Unlike traditional amine-amplifi cation approaches in which amplification effi ciency is signifi cantly reduced by self-crosslinking, the current amine amplifi cation process was self-crosslinkingfreedue to the use of a home-made compound in which amine groups were protected by Boc (tert-butyloxycarbonyl) protectinggroups and could be deprotected as needed. The inkjet ink formulated from the functionalized CNTs, together with anamine-rich compound and a commercial silver nanoparticle-based inkjet ink, was used to fabricate (via inkjet-printing anddrop-casting) lightweight, fl exible, and miniature-sized chemiresistive sensors for 4,8-dimethyldecanal (DMD), a compoundknown to be the aggregation pheromone of several species of fl our beetles. A home-built gas sensing system, including acommercial gas generator, a DMD permeation tube with its emission rate certifi ed, a data-acquisition system, and somehome-developed LabVIEW-based programs, was utilized to perform the DMD sensing trials. The sensors showed ultra-highsensitivity to synthetic aggregation pheromone DMD, as indicated by their prompt and signifi cant responses to 100 ppbDMD vapor. A mechanism for the sensitive sensing of DMD is proposed.
Frequency-Tunable Electromagnetic Absorber by Mechanically Controlling Substrate Thickness
Jeong, Heijun,Tentzeris, Manos M.,Lim, Sungjoon Hindawi Limited 2018 International journal of antennas and propagation Vol.2018 No.-
<P>In this paper, we propose a frequency-tunable electromagnetic absorber that uses the mechanical control of substrate thickness. The absorption frequency of the proposed absorber can be changed by varying the substrate thickness. In order to mechanically control the substrate thickness, we introduce a 3D-printed molding with air space. The proposed structure consists of two layers and one frame: the FR4 substrate, polylactic acid (PLA) frame, and air substrate. The FR4 and PLA thicknesses are fixed, and the air thickness is varied using the PLA frame. Therefore, the effective dielectric constant of the overall substrate can be changed. The metallic rectangular patch and ground are patterned on the top and bottom FR4 substrates, respectively. The performance of the proposed tunable absorber is demonstrated from full-wave simulation and measurements. When both of the FR4 substrate thicknesses are 0.3 mm and the air thickness is changed from 1 to 3.5 mm, the absorption frequency is changed from 8.9 to 8.0 GHz, respectively. Therefore, the frequency-tuning capability of the proposed absorber is successfully demonstrated.</P>
77‐GHz mmWave antenna array on liquid crystal polymer for automotive radar and RF front‐end module
김상길,Amin Rida,Vasileios Lakafosis,Symeon Nikolaou,Manos M. Tentzeris 한국전자통신연구원 2019 ETRI Journal Vol.41 No.2
This paper introduces a low‐cost, high‐performance mmWave antenna array module at 77 GHz. Conventional waveguide transitions have been replaced by 3D CPW‐microstrip transitions which are much simpler to realize. They are compatible with low‐cost substrate fabrication processes, allowing easy integration of ICs in 3D multi‐chip modules. An antenna array is designed and implemented using multilayer coupled‐fed patch antenna technology. The proposed 16 × 16 array antenna has a fractional bandwidth of 8.4% (6.5 GHz) and a 23.6‐dBi realized gain at 77 GHz.
A Novel High-Gain Tetrahedron Origami
Shah, Syed Imran Hussain,Lee, Dongju,Tentzeris, Manos M.,Lim, Sungjoon IEEE 2017 IEEE antennas and wireless propagation letters Vol.16 No.-
<P>In this letter, a novel high-gain tetrahedron origami antenna is introduced. The antenna comprises a triangular-shaped monopole, a reflector, and two parasitic strip directors on a paper substrate. The directors and the reflector are employed to increase the antenna gain. The step-by-step origami folding procedure is presented in detail. The proposed design of antenna is verified by both simulations and measurements with a fabricated prototype. The antenna exhibits a 10-dB impedance bandwidth of 66% (2-4 GHz) and a peak gain of 9.5 dBi at 2.6 GHz.</P>
Sungjin Choi,Wenjing Su,Tentzeris, Manos M.,Sungjoon Lim IEEE 2015 IEEE microwave and wireless components letters Vol.25 No.2
<P>In this letter, a novel fluid-reconfigurable advanced and delayed phase line using a microfluidic composite right/left-handed (CRLH) transmission line (TL) is proposed. A CRLH-TL prototype is inkjet-printed on a photo-paper substrate. In addition, a laser-etched microfluidic channel in poly(methyl methacrylate) (PMMA) is integrated with the CRLH TL using inkjet-printed SU-8 as a bonding material. The proposed TL provides excellent phase-tuning capability that is dependent on the fluidic materials used. As the fluid is changed, the proposed TL can have negative-, zero-, and positive-phase characteristics at 900 MHz for different fluids. The performance of the TL is successfully validated using simulation and measurement results.</P>