基于未来通信天线轻质量、小型化、平面结构及实现圆极化的发展趋势,设计了一种平面sinuous天线。文中首先给出了平面sinuous天线的基本原理,然后通过计算机对模型进行了构建,并进行了仿真分析。最终的结果表明,该天线具有良好的双圆极...基于未来通信天线轻质量、小型化、平面结构及实现圆极化的发展趋势,设计了一种平面sinuous天线。文中首先给出了平面sinuous天线的基本原理,然后通过计算机对模型进行了构建,并进行了仿真分析。最终的结果表明,该天线具有良好的双圆极化特性。天线的轴比在设计频带内达到3 d B以下、方向图不圆度小于0.5°。展开更多
Objective The term ＂pockmark＂ was introduced by King and MacLean （1970） to describe small ＂circular＂ on echosounder records in Nova Scotia. described as circular, near Pockmarks are usually circular or elongated...Objective The term ＂pockmark＂ was introduced by King and MacLean （1970） to describe small ＂circular＂ on echosounder records in Nova Scotia. described as circular, near Pockmarks are usually circular or elongated depressions, generally 10--400 m in diameter and 30-50 m in deep. Pockmarks are normally regarded to be manifestations of fluids escape through the seabed. Pockmarks are valuable features on the seafloor and are useful in constraining the hydrodynamics of sedimentary basins. Since then pockmarks have been recognized in many areas around the world. They occur predominantly in fine-grained siliciclastic depositional settings, although a few case studies have been reported in carbonate settings. In this paper we illustrate a suite of fluid escape features, discovered during the course of petroleum exploration on the West Africa continental margin （Fig. 1）. They are particularly of interest to the oil and gas industry because they could be potential indicators of deeply buried hydrocarbon reservoirs, and fluid flow phenomena in the deep water oilfield are important for the safe and efficient exploration, development and production of hydrocarbons in the area.展开更多
文摘基于未来通信天线轻质量、小型化、平面结构及实现圆极化的发展趋势,设计了一种平面sinuous天线。文中首先给出了平面sinuous天线的基本原理,然后通过计算机对模型进行了构建,并进行了仿真分析。最终的结果表明,该天线具有良好的双圆极化特性。天线的轴比在设计频带内达到3 d B以下、方向图不圆度小于0.5°。
基金supported by the National Planned Major Science and Technology Projects of China(grant No.2011ZX05030-005-02)
文摘Objective The term ＂pockmark＂ was introduced by King and MacLean （1970） to describe small ＂circular＂ on echosounder records in Nova Scotia. described as circular, near Pockmarks are usually circular or elongated depressions, generally 10--400 m in diameter and 30-50 m in deep. Pockmarks are normally regarded to be manifestations of fluids escape through the seabed. Pockmarks are valuable features on the seafloor and are useful in constraining the hydrodynamics of sedimentary basins. Since then pockmarks have been recognized in many areas around the world. They occur predominantly in fine-grained siliciclastic depositional settings, although a few case studies have been reported in carbonate settings. In this paper we illustrate a suite of fluid escape features, discovered during the course of petroleum exploration on the West Africa continental margin （Fig. 1）. They are particularly of interest to the oil and gas industry because they could be potential indicators of deeply buried hydrocarbon reservoirs, and fluid flow phenomena in the deep water oilfield are important for the safe and efficient exploration, development and production of hydrocarbons in the area.
