- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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[IEEE 2018 China International SAR Symposium (CISS) - Shanghai (2018.10.10-2018.10.12)] 2018 China International SAR Symposium (CISS) - Design of Compact Ka Band Antenna System for an InSAR Demonstrator
摘要： a compact and low profile Ka band antenna system designed for a demonstrator in InSAR application is presented in this paper. The system mainly contains 3 modules: the antenna array, the Rx component and the calibration network. The cross-track antenna contains 2 panel arrays and each has a dimension of 454×49.8mm2, while the along-track antenna contains 8 panel arrays and each has a dimension of 227.4×22.4mm2. All the arrays are fixed beam antennas and each will be connected with an Rx component to form a total of 10 active channels. The antennas adopt narrow side waveguide slot antenna as radiating element, and each panel array are composed by a number of smaller linear antenna sub-arrays whose sizes are optimized to have a high realized gains. The connection between antenna array and Rx component is realized by waveguide directly instead of using lossy SMP connector, and the Rx component can be attached at the back of the panel array tightly to improve the integration. The inner calibration network is integrated at the back of the antenna together with its feed network. The whole system as a demonstrator has a compact structure and can be expanded large scale system to meet the urgent conveniently to requirements of high performance antenna system in future InSAR application.
关键词： Ka band,InSAR,antenna system,multi-channel
更新于2025-09-23 15:22:29
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[IEEE 2018 9th International Conference on Ultrawideband and Ultrashort Impulse Signals (UWBUSIS) - Odessa, Ukraine (2018.9.4-2018.9.7)] 2018 9th International Conference on Ultrawideband and Ultrashort Impulse Signals (UWBUSIS) - Criteria for Selecting Object Coordinates at Probing by the Impulse UWB GPR with the “1Tx + 4Rx” Antenna System
摘要： An impulse UWB GPR antenna system consisting of one transmitter and four receivers has been designed for rapid detection of objects on, and under, the ground surface. The measured two-way times-of-flight for the reflected probing signals (from the radiator to the object and back to the four receivers) are used to calculate the (x, y, z) coordinates of the reflecting object. For cases where several reflected times-of-flight (due e.g. to reflections from the vehicle or other noise) are recorded, criteria enabling selection of unique coordinates that correspond to the true target have been determined and verified.
关键词： detection of object,UWB radar,time-of-flight,antenna system
更新于2025-09-23 15:21:21
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Groove Gap Waveguide Filter Based on Horizontally Polarized Resonators for V-Band Applications
摘要： In this article, resonators based on air-?lled rectangular cavity consisting of one perfect magnetic conductor (PMC) wall and the rest of walls as the perfect electric conductor (PEC) are proposed. The proposed cavity can be engraved in the top or bottom metal plate of a gap waveguide structure, and the PMC wall is realized by the periodic metallic pins located within the gap waveguide geometry. The resonant frequency and electromagnetic (EM) ?eld distribution of the cavity are investigated, and it is shown that the electric ?eld is horizontally polarized with respect to the wave propagation direction. Two bandpass ?lters are designed by inserting the proposed cavity in the cutoff region of the gap waveguide, on the top and bottom plates. In the latter case, all pins are the same, and the cavities and coupling structure are easily implemented by engraving the top plate. Therefore, by using this concept, a common pin plate can be used to implement different passive millimeter-wave devices. For instance, three different ?lters working at 60, 65, and 70 GHz with a common bottom pin plate are designed and fabricated. The measured results show a minimum insertion loss of 1.4, 1.1, and 1.1 dB with 0.83%, 1.4%, and 1.8% fractional bandwidth for the three bandpass ?lter designs, respectively, with aluminum as metal.
关键词： perfect magnetic conductor (PMC),Antenna system,millimeter-wave ?lter,gap waveguide
更新于2025-09-23 15:21:01
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Single-Layer Dual-Band Polarization-Selective Metafilm with Independently Controlled and Closely Spaced Shielding Bands
摘要： Spatially distributed transmissions in coordinated multipoint (CoMP) systems can lead to mean channel power imbalance (CPI) at the receiver. Similar imbalance also occurs in distributed antenna and co-located multi-antenna systems due to inaccurate antenna calibration. This paper studies performance impact of power imbalance on some practical CoMP methods with limited feedback. We derive approximate analytical expressions of asymptotic capacity, optimal amplitude weights, as well as signal-to-noise ratio gain for a few methods under analysis. Numerical results validate the analysis and show impacts of erroneous feedback under CPI. Results demonstrate that CPI has significant negative impact on the CoMP performance. Furthermore, our results reveal that amplitude information at transmitter is crucial and detrimental effect of CPI can be effectively compensated by using long-term amplitude information at transmitter. Moreover, additional short-term amplitude feedback shows insignificant gain when a large number of diversity antennas in base stations or CoMP suffer from feedback errors. In fact, a sparsely quantized phase and long-term power information feedback can lead to performance very close to the use of full channel state information at the transmitter.
关键词： transmit beamforming,Coordinated multipoint transmission,distributed antenna system,channel power imbalance
更新于2025-09-23 15:19:57
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[IEEE 2018 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP) - Auckland, New Zealand (2018.8.5-2018.8.8)] 2018 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP) - Display Frame UHF RFID Antenna for Museums
摘要： A display frame ultra-high frequency (UHF) radio frequency identification (RFID) reader antenna design is proposed for museums in this paper. Given its conformal design, the antenna can seamlessly hide and blend with the museum environment. RFID asset tracking, personnel tracking and anti-theft surveillance, can be accomplished without altering the display artifacts or disturbing the aesthetics of the museum. The series fed patch antenna array, arranged in a circular fashion makes the RFID tag detection viable in any orientation at the near zone. At far-field distances, the antenna can detect tags up to 6 meters. The antenna has a bandwidth of 28 MHz and is designed for Region-2 RFID frequencies. It uses an unconventional substrate that is lightweight, non-toxic, chemically resistant and self-extinguishing if exposed to fire. More than one frame antennas can be operated using multi-port RFID readers to realize a distributed antenna system within the museum.
关键词： distributed antenna system,conformal,UHF RFID reader antenna,display frame antenna,museum
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) - Two-port dual-polarized ring antenna for massive MIMO
摘要： In this paper, a novel design for a two-port dual-polarized ring antenna element is proposed. The antenna consists of a printed ring fed through commonly driven sets of two vertical and two horizontal slots. The input power of the feeding ports is split equally among the vertical/horizontal slots of the ring antenna by means of a 3-dB Wilkinson power divider. The dual-polarized ring antenna element exhibits horizontally and vertically polarized broadside radiation corresponding to the excitation of the respective horizontal and vertical slots. Measured results show that the proposed dual-polarized ring antenna exhibits an impedance bandwidth of 190 MHz (1.76?1.95 GHz). Furthermore, the mutual coupling between the ports is less than -30 dB. The proposed dual-polarized ring antenna can be a good candidate for use as an antenna element in the massive MIMO antenna array system for 5G applications.
关键词： printed ring,MIMO antenna system,dual-polarized
更新于2025-09-04 15:30:14