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公开(公告)号：US06218978B1
公开(公告)日：2001-04-17
申请号：US08477122
申请日：1995-06-22
IPC分类号： H01Q1500
CPC分类号： H01Q15/0026
摘要： A frequency selective surface includes at least one frequency selective layer (1) made up of an array of electrically conductive elements (2, 2a, 2b), at least one frequency selective layer (3) having an array of non-conductive apertures (4) therethrough overlaying the element layer (1) and a dielectric layer separating the two layers (1, 3). The element layer (1) is complementary in plan view to the aperture layer (3). The element layer (1) and the aperture layer (3) are rotated through 90 degrees in plan with respect to each other and substantially parallel to one another and the element array and the aperture array have the same periodicity.
摘要翻译： 频率选择表面包括由导电元件阵列（2,2a，2b）组成的至少一个频率选择层（1），至少一个频率选择层（3），具有非导电孔（4 ），覆盖元件层（1）和分离两层（1,3）的介电层。 元件层（1）在平面图中与孔层（3）互补。 元件层（1）和开口层（3）相对于彼此平面旋转90度并且基本上彼此平行，并且元件阵列和孔径阵列具有相同的周期性。
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公开(公告)号：US06369776B1
公开(公告)日：2002-04-09
申请号：US09408019
申请日：1999-09-29
IPC分类号： H01Q136
CPC分类号： H01Q11/08
摘要： A UHF antenna has an electrically insulative cylindrical core of a solid material having a relative dielectric constant greater than 5, and a three-dimensional antenna element structure disposed on or adjacent the outer cylindrical surface of the core. The antenna element structure is coupled to a coaxial feeder passing axially through the core. To reduce the effect of unwanted resonant modes associated with the resonant length of the feeder inside the core, the core is spaced from the outer conductor of the feeder by an intervening layer of insulative material having a relative dielectric constant which is much lower that that of the core material.
摘要翻译： UHF天线具有固体材料的电绝缘圆柱形芯，其具有大于5的相对介电常数，以及设置在芯的外圆柱形表面上或附近的三维天线元件结构。 天线元件结构耦合到轴向通过芯的同轴馈线。 为了减少与芯内的馈线的谐振长度相关联的不期望的谐振模式的影响，芯通过绝缘材料的间隔层与馈电线的外导体间隔开，绝缘材料的相对介电常数比 核心材料。
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