-
公开(公告)号：US6067053A
公开(公告)日：2000-05-23
申请号：US733399
申请日：1996-10-18
CPC分类号： H01Q21/26 , H01Q1/246 , H01Q21/08 , H01Q21/205 , H01Q21/245 , H01Q9/26
摘要： A planar array antenna having radiating elements characterized by dual simultaneous polarization states and having substantially rotationally symmetric radiation patterns. A distribution network, which is connected to each dual polarized radiator, communicates the electromagnetic signals from and to each radiating element. A ground plane is positioned generally parallel to and spaced apart from the radiating elements by a predetermined distance. The conductive surface of the ground plane operates to image the radiating elements over a wide coverage area, thereby enabling a radiation pattern within an azimuth plane of the antenna to be independent of any quantity of radiating elements. Side walls, placed on each side of the array of radiators, can operate in tandem with the ground plane, to reduce the half-power beamwidth in the azimuth plane for a selected radiator design. A central polarization control network (PCN), which is connected to the distribution network, can control the polarization states of the received signals distributed via the distribution network by the radiating elements.
摘要翻译： 一种具有辐射元件的平面阵列天线，其特征在于具有双重同时极化状态并且具有基本上旋转对称的辐射图案。 连接到每个双极化辐射器的分配网络将来自每个辐射元件的电磁信号传送到每个辐射元件。 接地平面大致平行于辐射元件并与辐射元件间隔开预定距离。 接地平面的导电表面用于在宽覆盖区域上对辐射元件进行成像，从而使天线方位平面内的辐射图与独立于任何数量的辐射元件无关。 放置在散热器阵列的每一侧的侧壁可以与接地平面一起工作，以减少所选散热器设计的方位平面中的半功率波束宽度。 连接到分配网络的中心极化控制网络（PCN）可以通过辐射元件来控制经由分配网络分配的接收信号的极化状态。
-
公开(公告)号：US5259327A
公开(公告)日：1993-11-09
申请号：US14853
申请日：1993-02-08
摘要： A process for killing soil pathogens to improve agricultural production includes the steps of treating a field with a soil conditioning agent to reduce the clods in the soil to microaggregates. Hot water is applied to the treated soil at varying depths to kill soil borne organisms. Beneficial organisms are then applied to the sterilized soil to repopulate the soil with these beneficial organisms.
摘要翻译： 杀死土壤病原体以改善农业生产的过程包括用土壤调理剂处理田地以将土壤中的土块减少到微团聚的步骤。 将热水以不同的深度施用于处理过的土壤，以杀死土壤生物体。 然后将有益生物施用于灭菌的土壤以用这些有益生物重新填充土壤。
-
公开(公告)号：US4742643A
公开(公告)日：1988-05-10
申请号：US873844
申请日：1986-06-10
CPC分类号： A01G13/065 , F24H1/165
摘要： A water heating and distributing system for affording freeze protection to plants and trees characterized by its utilization of a helical conduit for transporting the water to be heated in close proximity to a burner whereby the water's temperature is raised about 20.degree.-25.degree. F. The system further includes a plurality of jet spray heads disposed downstream of the heater in close proximity to the plants and trees to be protected, whereby a relatively fine mist, or fog, of heated water is applied for freeze protection.
摘要翻译： 一种用于对植物和树木进行冷冻保护的水加热和分配系统，其特征在于利用螺旋管道将待加热的水运送到靠近燃烧器的地方，由此水的温度升高到大约20°-25°F。 系统还包括设置在加热器下游的多个喷射喷头，其紧邻待保护的植物和树木，由此施加较细的雾或雾的加热水以进行防冻。
-
公开(公告)号：US5546421A
公开(公告)日：1996-08-13
申请号：US293979
申请日：1994-08-22
CPC分类号： H04B1/586
摘要： A communications station (10) couples a bidirectional input-output signal path (16') to two unidirectional signal paths; a transmit signal path (12') and a receive signal path (14'), using a controllable hybrid (20). A feedback control system in the station minimizes the amount of transmit signal appearing at the receive output port (24) of the hybrid (20). The control system spreads the spectrum of a pilot signal (40) by means of a biphase modulator (46) and a pseudorandom generator (42) to produce a spread-spectrum pilot, which is added, in a summer 30, to the transmit signal. The spread-spectrum pilot signal covers the bandwidth of the information signal, and is reflected in an amount and with a phase which depends upon the relative impedance presented to the hybrid (20) by the bidirectional signal path (16'). The receive signal, which arrives at the station bidirectional port (16) from the bidirectional path, is coupled from the hybrid (20) to a spread-spectrum demodulator (56), which regenerates the own-station pilot signal with a phase which depends upon the impedance presented by the bidirectional signal path to the hybrid. The pilot signal is phase-detected (64), processed, and applied to the hybrid to degeneratively minimize the amount of transmit signal coupled to the receive port (14).
摘要翻译： 通信站（10）将双向输入 - 输出信号路径（16'）耦合到两个单向信号路径; 发射信号路径（12'）和接收信号路径（14'），使用可控混合（20）。 站中的反馈控制系统使出现在混合动力（20）的接收输出端口（24）处的发射信号的量最小化。 控制系统通过双相调制器（46）和伪随机发生器（42）扩展导频信号（40）的频谱，以产生扩频导频，其在加法器30中被添加到发射信号 。 扩展频谱导频信号覆盖信息信号的带宽，并且反映在取决于通过双向信号路径（16'）呈现给混合（20）的相对阻抗的量和相位。 从双向路径到达站双向端口（16）的接收信号从混合（20）耦合到扩频解调器（56），扩频解调器（56）以相关的相位再生本站导频信号 通过双向信号路径提供给混合信号的阻抗。 导频信号被相位检测（64），被处理并应用到混合器以使耦合到接收端口（14）的发射信号的量退化最小化。
-
-
-
搜索结果
4 条记录 (耗时 0.015 秒)
