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oe1(光电查) - 科学论文

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出版时间
  • 2018
研究主题
  • Schottky diodes
  • frequency multipliers
  • submillimeter-wave technology
  • terahertz technology.
  • Submillimeter-wave sources
应用领域
  • Optoelectronic Information Science and Engineering
机构单位
  • California Institute of Technology
201 条数据
?? 中文（中国） ▾

  • [IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Rear Heterojunction GaAs Solar Cells With Strain-Balanced GaInAs/GaAsP Quantum Wells

    摘要： Simulation data from a ray-tracing tool applied in specific urban environments in the 28-GHz band suggest that the utilization of arbitrary base station (BS) angles in a directional search procedure may not be of maximum benefit for users located in non-line-of-sight positions, because certain angles restrict the radio frequency illumination to a lower maximum power than from others. An appropriate selection of BS angles offers a potential power level benefit of greater than 2 dB in a defined number of consecutive measurements; however, this performance improvement appears to be conditioned by the severity of the existing street canyon propagation and the probability of the angle used. A simple ray tracing method is proposed to approximately identify the most effective BS angles that avoid power emissions in directions largely blocked by nearby buildings. The results indicate that prior site-specific information may be helpful, particularly for systems using analog beamforming.

    关键词： Angle of arrival,user equipment,radio frequency,non-line-of-sight,beam direction,base station,millimeter wave,ray tracing

    更新于2025-09-19 17:13:59

  • [IEEE 2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall) - Xiamen, China (2019.12.17-2019.12.20)] 2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall) - Hybrid ARoF-WDM PON Infrastructure for 5G Millimeter-wave Interface and Broadband Internet Service

    摘要： In this paper, the architecture of hybrid analog radio over fiber (ARoF) and next-generation (NG) wavelength division multiplexed passive optical network (WDM-PON) infrastructure for broadband internet services and the latest fifth-generation (5G) cellular mobile communications is proposed. Investigated ARoF-WDM PON architecture is a trade-off between technology and cost for future 5G mobile cellular communications to meet the internet service requirements, allowing to increase system capacity ensuring higher spectral and energy efficiency. In our proposed infrastructure the widespread used passive optical access network (PON) architecture is technologically transformed to the AROF-WDM-PON transmission system without replacing existing network elements, by integrating baseband units (BBUs) or mobile radio transmitters located in optical line terminal (OLT) at the central office (CO) and the receiving radio unit (RU) part of mobile base stations, leaving the traditional WDM-PON broadband architecture unchanged. In our investigated ARoF-WDM PON transmission system model, designed in the simulation environment, we research the possible ARoF system implementation scenarios into the PON’s segment, which has been now standardized to the 40 Gigabit-capable next-generation passive optical network (NG-PON2) standard providing an unique solution for hybrid fiber optical infrastructure serving as the next step for future 5G wireless communication networks.

    关键词： 5G,millimeter-wave,broadband internet,WDM-PON,ARoF

    更新于2025-09-19 17:13:59

  • [IEEE 2019 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - Guangzhou, China (2019.5.19-2019.5.22)] 2019 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - Slot Coupled Directional Wideband Millimeter-Wave Antenna

    摘要： A wideband millimeter-wave (mm-wave) antenna using cavity and slot coupling techniques is presented in this paper. The bandwidth of the created mm-wave antenna is expanded by loading a circular patch over the C-shaped patch via a slot coupling, in which the circular patch is fed by slot coupling. The copper cavity-backed structure is utilized to provide stable directional radiation characteristics. The wideband mm-wave antenna is printed on RT/Duroid 5880 substrate, and the simulation results show that the mm-wave antenna can achieve a wide bandwidth of 46.2% (33.8-54.1GHz). The proposed mm-wave antenna has good directional radiation characteristics and small size, rendering it useful in many wireless communication systems.

    关键词： cavity-backed structure,millimeter-wave antenna,directional radiation,slot coupling

    更新于2025-09-19 17:13:59

  • Wideband Substrate Integrated Waveguide Fed Open Slot Antenna Array

    摘要： This work investigates the use of substrate integrated waveguide fed open slot antenna (WOSA) in an array for the first time to provide a new SIW slot antenna array with wide bandwidth and single-layer structure. The antenna array consists of 4 × 2 substrate integrated WOSA elements as a radiating part and two 1-to-4 SIW power dividers as the feeding network. The whole array is differentially fed and built on a single-layered laminate. To demonstrate the wideband performance of the substrate integrated WOSA elements, two sets of feeding networks designed at different frequencies are used to feed the same radiating part. In this way, a V-band and a W-band array were built. Both the antenna arrays were fabricated and measured. Benefiting from the excellent performance of the substrate integrated WOSA elements, the antenna array achieves a wide bandwidth of 32.3% (54.0 to 74.8 GHz) with a peak gain varies from 11.3 to 15.6 dBi. It has been demonstrated that the substrate integrated WOSA array can achieve a wide bandwidth with a single-layer structure, which is attractive for millimeter-wave applications.

    关键词： waveguide fed open slot antenna (WOSA),Antenna array,wideband,millimeter-wave

    更新于2025-09-19 17:13:59

  • [IEEE 2019 International Conference on Electrical Engineering and Computer Science (ICECOS) - Batam Island, Indonesia (2019.10.2-2019.10.3)] 2019 International Conference on Electrical Engineering and Computer Science (ICECOS) - Modelling of Polymer Coated-based Optical Fiber Sensor for Moisture Measurement in Transformer Oil

    摘要： The presence of phase noise (PN) severely deteriorates the sensitivity and range of frequency-modulated continuous wave radar systems. Thus, characterization and continuous monitoring of the PN is indispensable, and its estimation is often employed directly on chip. Although many contributions investigate methods for PN estimation, almost all of them consider a continuous-wave (CW) input signal. Differently, in this paper, we aim to estimate the PN from a linear frequency modulated continuous wave (FMCW) signal. For that, we propose two methods utilizing a so-called artificial on-chip target and further digital signal processing. These methods are evaluated in real-time and are the first-known solutions to determine PN estimates during the operation of an FMCW radar transceiver. We prove our methods with both simulation and measurement results from a hardware prototype. Further, we present techniques to efficiently realize the concepts in digital hardware. Finally, we compare and trade off the proposed methods against computational complexity and performance. The novel techniques may be applied to arbitrary input frequencies and bandwidths, and do not require a reference-clock input.

    关键词： phase noise (PN),estimation,frequency-modulated continuous wave (FMCW),millimeter-wave radar,Delay lines,monolithic microwave integrated circuits

    更新于2025-09-16 10:30:52

  • [IEEE 2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting - Atlanta, GA, USA (2019.7.7-2019.7.12)] 2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting - Wideband printed ridge gap waveguide differential feeding aperture antenna for millimeter wave applications

    摘要： Millimeter wave has gained great attention for 5G communications and imaging systems. Building a high gain antenna is essential to such systems. In this paper, the design of a high gain differential feeding aperture antenna in the printed ridge gap waveguide technology is presented. It has a fractional bandwidth of 16.1% at 30GHz with S11<?10dB and peak gain of 12.8dBi. The aperture efficiency is 52% and the radiation pattern is stable over the operating frequency range. The 3-dB gain bandwidth is 15.4%dBi.

    关键词： 5G communications,Millimeter wave,high gain antenna,printed ridge gap waveguide,differential feeding aperture antenna

    更新于2025-09-16 10:30:52

  • Bandwidth Extension of Planar Microstrip-to-Waveguide Transition by Controlling Transmission Modes Through Via-Hole Positioning in Millimeter-Wave Band

    摘要： This paper presents a design technique to achieve a broadband planar microstrip-to-waveguide transition in a millimeter-wave (mmWave) band. In the conventional planar microstrip-to-waveguide transition, via holes are located around the rectangular waveguide and microstrip line to prevent power leakage due to the generation of a multi-transmission mode. Therefore, a single-transmission mode is dominant at the input port of the transition, with a narrow bandwidth of the single resonance. In the broadband planar microstrip-to-waveguide transition, via-hole positioning is utilized to add inductance to constrain the predominance of the single-transmission mode at the input port of the transition. The double-resonant frequency yielded by excitation of the grounded coplanar waveguide transmission mode and parallel plate transmission mode is obtained by controlling the positions of holes adjacent to the microstrip line. Moreover, to simplify the structure and meet the requirement of high assembly accuracy in fabrication, two holes adjacent to the microstrip line are maintained, but the remaining holes are replaced by a choke structure that performs the equivalent function to the via-hole arrangement. The influences of the multi-transmission mode and choke structure on the characteristics are investigated by electromagnetic analysis, and the feasibility is confirmed by experiments in this work. A double-resonant frequency and a broad bandwidth of 10.6 GHz (13.8%) are obtained. The measured results of the broadband planar microstrip-to-waveguide transition using via-hole positioning show an insertion loss of 0.41 dB at the center frequency of 76.5 GHz.

    关键词： Microwave and millimeter-wave circuits,broadband,waveguide transition,multi-transmission mode,microstrip transition

    更新于2025-09-16 10:30:52

  • [IEEE 2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting - Atlanta, GA, USA (2019.7.7-2019.7.12)] 2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting - Empty Substrate Integrated Waveguide Planar Slot Antenna Array for 5G Wireless Systems

    摘要： This paper introduces a planar 4 × 4 slot antenna array based on Empty Substrate Integrated Waveguide at 28 GHz. The proposed antenna offers reduced weight and fabrication cost as well as relatively feasible integration with planar electronic components. The proposed antenna suggests an operating bandwidth of 7.8% (i.e. 27.1-29.3 GHz) suitable to fulfill demands of 5th Generation (5G) networks with high gain performance of 17.2 dBi and with reduced sidelobes level in the H-plan.

    关键词： antenna,millimeter-wave,5G,planar,array

    更新于2025-09-16 10:30:52

  • Millimeter-wave Air-filled Slot Antenna with Conical Beam Based on Bulk Silicon MEMS Technology

    摘要： In this communication, a millimeter-wave (mm-wave) air-filled slot antenna with a conical beam at 60 GHz is proposed. The antenna is suitable to be integrated with various IC systems mainly because it is designed and fabricated based on bulk silicon MEMS technology. The whole structure is composed of an antenna part and a waveguide to SIW converter. In the antenna part, four meander slots are arranged annularly and excited by a square air cavity. The conical radiation pattern benefits from the out-phase E field excited on slots. An operating bandwidth of 2.17% for S11 < -10 dB and a conical beam peak gain of 3.21 dBi are achieved. The proposed antenna shows its potentials in mm-wave indoor communication.

    关键词： IC integration,slot antenna,Millimeter wave,indoor communication,conical beam,bulk silicon MEMS technology

    更新于2025-09-16 10:30:52

  • [IEEE 2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) - Paris, France (2019.9.1-2019.9.6)] 2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) - Via-Less Microstrip to Rectangular Waveguide Transition on InP

    摘要： Indium-Phosphide (InP) is one of the most common materials used for realizing active devices working in the millimeter frequency range. The isotropic etching profile of InP substrates limits the realization of passive devices, thus requiring an expensive and lossy hybrid platform. This paper presents a via-less, cost-effective and efficient solution for InP substrate. By using the proposed planar solution, it is demonstrated that rectangular waveguides can be realized on InP by fabricating a bed of nails structure which acts as a reflecting boundary for an impinging millimeter wave. As a proof of concept, a transition from microstrip to rectangular waveguide structure is realized within H-band (220-320 GHz) with a return loss of -18dB over a bandwidth of 30 GHz.

    关键词： via-less,microstrip,millimeter wave,bed of nails,rectangular waveguide,Indium-Phosphide (InP)

    更新于2025-09-16 10:30:52