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公开(公告)号：US5444452A
公开(公告)日：1995-08-22
申请号：US191937
申请日：1994-02-04
申请人： Munehiko Itoh , Masao Arakawa , Raj Mittra
发明人： Munehiko Itoh , Masao Arakawa , Raj Mittra
CPC分类号： H01Q5/42
摘要： An antenna apparatus for receiving two distinct frequencies in the MHz or GHz range. A patch layer of electrically conducting material is positioned in the interior of a dielectric layer that has top and bottom surfaces. First and second ground planes are positioned on the top and bottom surfaces of the substrate, respectively. The patch is electrically connected by plated via holes to an annular strip of conducting material, positioned on the top substrate surface and surrounding the first ground plane. A patch antenna for receiving a first frequency is thus formed by the patch layer and the second ground plane. A cavity antenna for receiving a second frequency is formed from the patch layer, the first ground plane, and the annular strip. Two receiver feed connections, positioned at selected first and second positions on the patch resonator, receive distinct first and second frequencies.
摘要翻译： 一种在MHz或GHz范围内接收两个不同频率的天线装置。 导电材料的贴片层位于具有顶表面和底表面的电介质层的内部。 第一和第二接地平面分别位于基板的顶表面和底表面上。 贴片通过电镀通孔电连接到导电材料的环形条，定位在顶部衬底表面上并围绕第一接地平面。 因此，用于接收第一频率的贴片天线由贴片层和第二接地平面形成。 用于接收第二频率的空腔天线由贴片层，第一接地平面和环形条形成。 定位在补片谐振器上选定的第一和第二位置的两个接收器馈送连接器接收不同的第一和第二频率。
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公开(公告)号：US20050052321A1
公开(公告)日：2005-03-10
申请号：US10657824
申请日：2003-09-09
申请人： Yoonjae Lee , Suman Ganguly , Raj Mittra
发明人： Yoonjae Lee , Suman Ganguly , Raj Mittra
CPC分类号： H01Q1/38 , H01Q9/0407 , H01Q13/08
摘要： A multifrequency antenna comprising a stack of nonconductive substantially planar substrates, with a conductive layer disposed on each substrate surface. A first substrate includes transmission lines disposed on a rear surface and a conducting layer on the other surface. A second substrate is stacked on the first substrate. A conducting layer is disposed on one side of the second substrate surface. Conducting layers disposed on first and second substrates include a plurality of slotted openings arrayed about an antenna axis. A third substrate stacked on the second substrate includes a conducting layer top. A lossy dielectric-magnetic material encloses sides and rear of the multifrequency antenna, to prevent electromagnetic energy penetration through the enclosure. An edge diffraction suppresser reflector is attached in the rear surface of the multifrequency antenna, and has two or more essentially circular, conducting plates and a multitude of conducting cylinders along the axis of the multifrequency antenna.
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公开(公告)号：US06940457B2
公开(公告)日：2005-09-06
申请号：US10657824
申请日：2003-09-09
申请人： Yoonjae Lee , Suman Ganguly , Raj Mittra
发明人： Yoonjae Lee , Suman Ganguly , Raj Mittra
CPC分类号： H01Q1/38 , H01Q9/0407 , H01Q13/08
摘要： A multifrequency antenna comprising a stack of nonconductive substantially planar substrates, with a conductive layer disposed on each substrate surface. A first substrate includes transmission lines disposed on a rear surface and a conducting layer on the other surface. A second substrate is stacked on the first substrate. A conducting layer is disposed on one side of the second substrate surface. Conducting layers disposed on first and second substrates include a plurality of slotted openings arrayed about an antenna axis. A third substrate stacked on the second substrate includes a conducting layer top. A lossy dielectric-magnetic material encloses sides and rear of the multifrequency antenna, to prevent electromagnetic energy penetration through the enclosure. An edge diffraction suppresser reflector is attached in the rear surface of the multifrequency antenna, and has two or more essentially circular, conducting plates and a multitude of conducting cylinders along the axis of the multifrequency antenna.
摘要翻译： 一种多频天线，包括非导电的基本平坦的基板堆叠，其中每个基板表面上设置有导电层。 第一基板包括设置在后表面上的传输线和在另一表面上的导电层。 第二基板被堆叠在第一基板上。 导电层设置在第二基板表面的一侧上。 设置在第一和第二基板上的导电层包括围绕天线轴线排列的多个开槽开口。 堆叠在第二基板上的第三基板包括导电层顶部。 有损介质磁性材料包围多频天线的侧面和背面，以防止电磁能量穿过外壳。 边缘衍射抑制反射器安装在多频天线的后表面，并且具有两个或更多个基本圆形的导电板和沿着多频天线的轴线的多个导电圆柱体。
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公开(公告)号：US5714947A
公开(公告)日：1998-02-03
申请号：US790145
申请日：1997-01-28
CPC分类号： G01S13/931 , H01Q1/3233 , H01Q19/192 , G01S2013/9325 , G01S2013/9353 , G01S7/02 , Y10S367/907
摘要： A collision avoidance system for a vehicle has a vehicle steering sensor for sensing a direction in which the vehicle is being steered, a source of radiation, an articulated reflector for directing radiation from the source in a desired direction, an articulation mechanism for effecting articulation of the articulate reflector, and a close loop control circuit responsive to the vehicle steering sensor for controlling the articulation mechanism so as to cause the articulated reflector to direct radiation in a direction which is generally the same as that direction in which the vehicle is turning.
摘要翻译： 用于车辆的防撞系统具有用于感测车辆被转向的方向的车辆转向传感器，辐射源，用于沿着期望的方向引导来自源的辐射的铰接式反射器，用于实现 所述关节式反射器和响应于所述车辆转向传感器的闭环控制电路用于控制所述关节运动机构，以使所述铰接式反射器沿与所述车辆转向方向大致相同的方向引导辐射。
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公开(公告)号：US5786793A
公开(公告)日：1998-07-28
申请号：US908723
申请日：1997-08-08
申请人： Shuji Maeda , Tsutomu Kobayashi , Munehiko Itoh , Raj Mittra , Ikmo Park , Supriyo Dey
发明人： Shuji Maeda , Tsutomu Kobayashi , Munehiko Itoh , Raj Mittra , Ikmo Park , Supriyo Dey
CPC分类号： H01Q9/045 , H01Q1/38 , H01Q21/0075 , H01Q21/065 , H01Q21/24 , H01Q9/0421 , H01Q9/0428
摘要： A compact antenna for circular polarization comprises a substrate of a dielectric material which is formed on its bottom surface with a ground plane and on its top surface with four planar rectangular patches of an electrically conductive material. The four patches are mounted in a coplanar relation on the top surface of the substrate, and arranged along four sides of a square pattern with the length of each patch angled at 90.degree. with respect to the length of the two adjacent patches. Each of the four patches is short-circuited to the ground plane at a shorting point located at a corner of the square pattern. A 90.degree. hybrid circuit is connected to directly feed only the two adjacent patches with a phase difference of 90.degree. to thereby define these two patches as active antenna elements which are fed with 0.degree. and 90.degree. signals, respectively. The other two adjacent patches are not fed from the hybrid circuit to define parasitic antenna elements each coupled with the adjacent active antenna element to provide a signal which is 90.degree. out of phase with a signal on the adjacent active antenna element. Thus, the active and parasitic antenna elements arranged in one direction around the substrate are fed at 0.degree., 90.degree., 180.degree., and 270.degree. phases for circular polarization only with the use of a single hybrid circuit.
摘要翻译： 用于圆偏振的小型天线包括介电材料的基底，其在其底表面上形成有接地平面，并且在其顶表面上形成有导电材料的四个平面矩形斑块。 四个贴片以共面关系安装在基板的顶表面上，并且沿着四边形排列，每个贴片的长度相对于两个相邻贴片的长度成90°角。 四个贴片中的每一个在位于正方形图案的拐角处的短路点处与接地平面短路。 90°混合电路连接，直接仅以相位差为90°的两个相邻的贴片进行馈送，从而将这两个贴片分别定义为0°和90°信号的有源天线元件。 另外两个相邻的贴片不从混合电路馈送以限定每个与相邻有源天线元件耦合的寄生天线元件，以提供与相邻有源天线元件上的信号相差90°的信号。 因此，仅在使用单个混合电路的情况下，在0°，90°，180°和270°相位处沿一个方向布置在基板周围的有源和无功天线元件用于圆极化。
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公开(公告)号：US5323168A
公开(公告)日：1994-06-21
申请号：US912532
申请日：1992-07-13
申请人： Munehiko Itoh , Masao Arakawa , Raj Mittra
发明人： Munehiko Itoh , Masao Arakawa , Raj Mittra
CPC分类号： H01Q5/42
摘要： Antenna apparatus for receiving two distinct frequencies in the MHz or GHz range. A resonator layer of electrically conducting material is positioned in the interior of a dielectric layer that has first and second opposed surfaces (front and back). First and second ground planes are positioned on the first and second opposed surfaces of the substrate. The resonator is electrically connected to an annular strip of conducting material, positioned on the first substrate surface and surrounding the first ground plane. Two receiver feed connections, positioned at selected first and second positions on the patch resonator, receive distinct first and second frequencies. This apparatus may be used to receive the two GPS operating frequencies, the two GLONASS operating frequencies or two wireless LAN operating frequencies.
摘要翻译： 用于在MHz或GHz范围内接收两个不同频率的天线装置。 导电材料的谐振器层位于具有第一和第二相对表面（前后）的电介质层的内部。 第一和第二接地平面位于基板的第一和第二相对表面上。 谐振器电连接到导电材料的环形条，定位在第一基片表面上并围绕第一接地平面。 定位在补片谐振器上选定的第一和第二位置的两个接收器馈送连接器接收不同的第一和第二频率。 该装置可以用于接收两个GPS操作频率，两个GLONASS工作频率或两个无线LAN工作频率。
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