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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
  • plane-layered stratified medium
  • UWB signals
  • road pavements
  • inverse scattering problem
  • GPR
应用领域
  • Optoelectronic Information Science and Engineering
机构单位
  • V. N. Karazin Kharkiv National University
  • Kharkiv National Automobile and Highway University
71 条数据
?? 中文（中国） ▾

  • A broadband circularly polarized monopole antenna

    摘要： A compact modified C-shaped monopole antenna with broadband circular polarization is proposed, fabricated and measured. The antenna structure is simple and only consists of combined modified C-shaped radiation patch and an improved ground plane with the overall size of 25 × 25 × 1 mm3. By cutting the corner on the modified C-shaped patch and adding triangular stubs on the ground plane, the wide impedance bandwidth and axial ratio bandwidth are achieved. The design process of the antenna is given, and the circular polarization mechanism of the circularly polarized antenna is analyzed from the surface current distributions. The measured impedance bandwidth is 95.2% (4.4-12.4 GHz) with return loss better than 10 dB, and the measured 3 dB axial ratio bandwidth is 96.8% (4.42-12.72 GHz). The peak gain is above 3.0 dBi within the working band, which indicates that it is suitable for application of ultra-wideband (UWB) wireless communication systems and satellite communication systems.

    关键词： axial ratio,ultra-wideband (UWB),monopole antenna,circular polarization

    更新于2025-09-23 15:23:52

  • Co-designed defected ground structure filter with UWB slot antenna

    摘要： In this study, one kind of novel co-designed defected ground structure (DGS) filter with slot antenna is proposed to realize bandpass reflection coefficient and gain performance. This antenna consists of two parts: 1) a 50 Ω feeding line and 2) a modified stepped slot with additional narrow slot and defected ground structure. The extra narrow slot, which can effectively prolong the current path of low frequency and generate reflection zero, is introduced to improve the lower band-edge selectivity. DGS is used to improve the upper band-edge selectivity, which can produce transmission zeros in certain frequencies and provides excellent stopband characteristics. In addition, the modified stepped slot with DGS can produce additional resonance frequency, which is helpful to improve the in-band impedance characteristics and radiation efficiency of the antenna. Measured results show that not only the band-edge selectivity of the antenna is improved, but also the in-band impedance matching and radiation efficiency are improved. The experimental results show that the proposed design could be a good candidate for UWB applications.

    关键词： UWB antenna,defected ground structures (DGS),band-edge selectivity

    更新于2025-09-23 15:23:52

  • Design of Cross-Shaped CPW-Fed Ultrawideband Slot Antenna

    摘要： A new design of ultrawideband (UWB) antenna of coplanar waveguide (CPW)-fed is proposed. The antenna is composed of a cross-shaped patch and house-shaped slot with the minimum dimension of 21 mm × 20 mm × 1.6 mm. The analysis of S11, VSWR, radiation pattern and surface current is discussed with HFSS simulation software, and also the effect of parameters is presented. Experimental results show that the bandwidth of the antenna covers 110.67% (3.3—11.6 GHz) of UWB range with return loss better than 10 dB. And the good impedance matching in frequency band confirms the antenna is a good candidate for the application of wireless system.

    关键词： return loss,ultrawideband (UWB),coplanar waveguide,HFSS

    更新于2025-09-23 15:23:52

  • UWB radar cross section reduction in a compact antipodal Vivaldi antenna

    摘要： This paper presents the design of a compact antipodal Vivaldi antenna (AVA) with reduced radar cross section (RCS) for directional UWB communications. The impedance characteristics of a conventional AVA are improved by introducing a BALUN taper in the ground plane and circular slots of different diameters in the wings of the AVA. The slots on the wings improve the RCS performance of the antenna by rejecting the orthogonal radiations from the AVA. Furthermore, drills of suitable diameter are introduced to further enhance the monostatic RCS performance. The proposed AVA offers 74% size reduction compared to the existing AVAs reported in literature with its bandwidth extending from 3 GHz to over 12 GHz. The prototype AVA is fabricated and the simulation results are veri?ed using experimental measurements. The prototype antenna offers at least 11 dB reduction in RCS throughout the operating bandwidth with a peak reduction of 16 dB at 7 GHz and 11 GHz.

    关键词： Vivaldi antenna,UWB,Tapered slot antenna,Stealth applications,Monostatic RCS

    更新于2025-09-23 15:23:52

  • Planar UWB Monopole Antenna with Tri-Band Rejection Characteristics at 3.5/5.5/8 GHz

    摘要： A triple band-notched ultrawide band (UWB) antenna is presented to avoid the interference of services working in the UWB band, such as WLAN, WiMAX and X-band satellite systems. The arc H-shaped slot on the radiating patch creates a low frequency notched band, while the other two band-notched bands are formed by cutting narrow slots on the ground plane. The presented antenna can operate on the ultrawide band efficiently and inhibit interference from three different kinds of narrow band communication systems. The simulation and measurement results show that the antenna has excellent band-notched function on the rejectband and almost omnidirectional radiation pattern on the passband.

    关键词： planar monopole antenna,slots,triple band-notched,ultrawide band (UWB) antenna

    更新于2025-09-23 15:23:52

  • [Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering] Wireless Internet Volume 264 (11th EAI International Conference, WiCON 2018, Taipei, Taiwan, October 15-16, 2018, Proceedings) || A60?GHz UWB-MIMO Antenna with Defected Ground for WPAN Applications

    摘要： The article presents a novel ultra-wideband (UWB) multi-input multi-output (MIMO) antenna with high isolation. The proposed MIMO antenna consists of four folded L-shaped strips patch which has very compact size of 2, 2 (cid:1) 2, 2 mm2. A line-slot is etched on the ground to reduce the mutual coupling on the 60 GHz band. Four other no-ended slots are etched on subtract to improve the impedance matching and to enlarge the bandwidth. Proposed antenna is resonating at 61 GHz. The mutual coupling is less than ?15 dB throughout the 60 GHz band. The envelope correlation coef?cient is less than 0.006 in the whole operating band. The performances of the proposed antenna indicate that it is a good candidate for UWB applications.

    关键词： ECC,MIMO,UWB,Defected ground

    更新于2025-09-23 15:22:29

  • Simple Design Procedure of a Broadband Circularly Polarized Slot Monopole Antenna Assisted by Characteristic Mode Analysis

    摘要： In this paper, a systematic design procedure of a compact and broadband circularly polarized (CP) antenna is proposed. The antenna is first designed with a C-shaped monopole, and then a C-shaped slotted patch is utilized to produce CP radiation in the lower frequency band. Thus, the antenna's overall CP bandwidth (BW) is significantly increased. In addition, unlike the conventional method in which the operation is verified by the simulated surface current distribution, characteristic mode analysis (CMA) is carried out to give more insight into different modes on the antenna and generation of circular polarization. The CMA also helps to realize a structural optimization and identify an efficient feed location. The optimized antenna prototype with a compact size of 0.29λo × 0.29λo × 0.01λo (λo is the minimum wavelength at the minimum operation frequency) achieves a usable 10-dB reflection coefficient and 3-dB axial ratio fractional BW of 91% (2.1–5.6 GHz). The antenna realized broadside gain varies from 1.5 to 3.2 dBic within this measured overlapped BW.

    关键词： UWB antenna,slot,circularly polarized (CP),monopole,characteristic mode (CM)

    更新于2025-09-23 15:22:29

  • [IEEE 2018 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP) - Auckland (2018.8.5-2018.8.8)] 2018 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP) - Design of Band-notched UWB Rectangular Dielectric Resonator Antenna

    摘要： A rectangular dielectric resonator antenna fed by microstrip line at non-central symmetric position with partial ground plane is presented. The proposed dielectric resonator with given dimensions is easy to excite multiple modes and generate the broadband of 7.09GHz, ranging from 3.89 to 10.98GHz. Due to the introduction of parasitic metal ring, band-notched property can be achieved. When the total length comes to the half a guide wavelength, the notched band at corresponding frequency is generated. Simulations confirm the validation of the design principle. The compact size of the band-notched DRA is 25mm×28mm with 4.037mm thickness.

    关键词： rectangular dielectric resonator,UWB,dielectric resonator antenna,band-notched

    更新于2025-09-23 15:22:29

  • [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) - Remote Vital Sign Recognition through Machine Learning augmented UWB

    摘要： This paper describes an experimental demonstration of machine learning (ML) techniques supplementing radar to distinguish and detect vital signs of users in a domestic environment. This work augments an intelligent location awareness system previously proposed by the authors. That research employed Ultra-Wide Band (UWB) radar complemented by supervised machine learning techniques to remotely identify a person’s room location via ?oor plan training and time stamp correlations. Here, the remote breathing and heartbeat signals are analyzed through Short Term Fourier Transformation (STFT) to determine the Micro-Doppler signature of those vital signs in different room locations. Then, Multi-Class Support Vector Machine (MC-SVM) is implemented to train the system to intelligently distinguish between vital signs during different activities. Statistical analysis of the experimental results supports the proposed algorithm. This work could be used to further understand, for example, how active older people are by engaging in typical domestic activities.

    关键词： Short Term Fourier Transform (STFT),Breathing,Ultra-Wide Band (UWB),Multi-Class Support Vector Machine (MC-SVM),Heartbeat,Indoor Positioning System (IPS)

    更新于2025-09-23 15:22:29

  • [IEEE 2018 IEEE Photonics Conference (IPC) - Reston, VA (2018.9.30-2018.10.4)] 2018 IEEE Photonics Conference (IPC) - High-Power Photonic Phased Array Antennas

    摘要： We review recent work on a new antenna concept— the high-power photonic phased array. By integrating high-power photodiodes proximal to the transmit aperture’s radiating elements, dense, lightweight, and broadband array designs are realized. Several manifestations of this idea are discussed, emphasizing different application-specific design choices.

    关键词： RF photonics,ultra-wideband (UWB),photonic antenna,phased array antenna,5G,high-power photodiode,millimeter wave (mmW)

    更新于2025-09-23 15:22:29