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[IEEE 2018 IEEE Conference on Antenna Measurements & Applications (CAMA) - Va?ster?s (2018.9.3-2018.9.6)] 2018 IEEE Conference on Antenna Measurements & Applications (CAMA) - Design of Low-profile Antenna with Multi-directional Beam
摘要： An planar antenna having a low-pro?le structure using loop elements is proposed. The proposed antenna is vertically polarized and has four directional beams for sensor nodes. The thickness of the antenna is only 3.2 mm (0.11 effective wavelength) resulting in a low-pro?le structure. Simulated and measured average gain of 8.0 dBi and 5.6 dBi are obtained, respectively.
关键词： wireless sensor network,sensor node,low-pro?le antenna,vertical polarization,multi-directional beam
更新于2025-09-23 15:23:52
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[IEEE 2018 IEEE International Conference on Computational Electromagnetics (ICCEM) - Chengdu, China (2018.3.26-2018.3.28)] 2018 IEEE International Conference on Computational Electromagnetics (ICCEM) - A Vertically-Polarized Ultra-Wideband, Low-Profile and Folded Half Vivaldi Antenna
摘要： A vertically-polarized, ultra-wideband (UWB), low-profile Vivaldi antenna is presented in this paper. Only half of the Vivaldi is placed perpendicularly to the ground plane to achieve vertical polarization. The upper part of the antenna is folded into a right angle to achieve a low-profile. The rectangular slotlines are used to improve VSWR and enhance the gain at the end-fire orientation in the operating frequency band, and a 50? coaxial probe connects directly with the end of taper slot for feeding purpose. The total sizes are 100 (length) × 50 (width) × 16 (height) mm3. Simulated results show that the designed antenna exhibits a bandwidth from 3.2 to 24 GHz (7.5:1) for VSWR<2.2, and stable radiation patterns in 3 ~ 16 GHz.
关键词： vivaldi antenna,ultra-wideband,vertical polarization,rectangular slotline
更新于2025-09-10 09:29:36
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Ocean Wind Retrieval Models for RADARSAT Constellation Mission Compact Polarimetry SAR
摘要： We propose two new ocean wind retrieval models for right circular-vertical (RV) and right circular-horizontal (RH) polarizations respectively from the compact-polarimetry (CP) mode of the RADARSAT Constellation Mission (RCM), which is scheduled to be launched in 2019. For compact RV-polarization (right circular transmit and vertical receive), we build the wind retrieval model (denoted CoVe-Pol model) by employing the geophysical model function (GMF) framework and a sensitivity analysis. For compact RH polarization (right circular transmit and horizontal receive), we build the wind retrieval model (denoted the CoHo-Pol model) by using a quadratic function to describe the relationship between wind speed and RH-polarized normalized radar cross-sections (NRCSs) along with radar incidence angles. The parameters of the two retrieval models are derived from a database including wind vectors measured by in situ National Data Buoy Center (NDBC) buoys and simulated RV- and RH-polarized NRCSs and incidence angles. The RV- and RH-polarized NRCSs are generated by a RCM simulator using C-band RADARSAT-2 quad-polarized synthetic aperture radar (SAR) images. Our results show that the two new RCM CP models, CoVe-Pol and CoHo-POL, can provide efficient methodologies for wind retrieval.
关键词： CoVe-Pol and CoHo-Pol models,compact polarization (CP),RADARSAT Constellation Mission (RCM),right circular horizontal polarization model,right circular vertical polarization model,wind retrieval,geophysical model function (GMF)
更新于2025-09-09 09:28:46