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1. 发明授权

US10746774B2 Freespace antenna measurement system 有权
公开(公告)号：US10746774B2
公开(公告)日：2020-08-18
申请号：US16146317
申请日：2018-09-28
申请人： Vasundara V. Varadan
发明人： Vasundara V. Varadan
IPC分类号： H01Q13/02 , G01R29/10 , H01Q19/06 , G01R29/08
摘要： Embodiments of the present invention may provide an antenna characterization system. The system may include a horn antenna including a waveguide and a horn section with an open end and at least one lens disposed at the open end of the horn antenna, having a focal length. The system may also include a platform to hold an antenna under test (AUT) positioned at substantially distance x from the open end of the horn antenna, wherein x is the sum of the focal length and a far-field distance property of the AUT. The system may further include an analyzer coupled to the horn antenna to measure a radiation pattern and other properties such as EIRP, TRP, EVR and spurious emission of a passive or active AUT.

2. 发明授权

US06516665B1 Micro-electro-mechanical gyroscope 失效
标题翻译：微机电陀螺仪
公开(公告)号：US06516665B1
公开(公告)日：2003-02-11
申请号：US09594370
申请日：2000-06-15
申请人： Vijay K. Varadan , Pascal B. Xavier , William D. Suh , Jose A. Kollakompil , Vasundara V. Varadan
发明人： Vijay K. Varadan , Pascal B. Xavier , William D. Suh , Jose A. Kollakompil , Vasundara V. Varadan
IPC分类号： G01P300
CPC分类号： G01C19/5698 , H03H9/02645 , H03H9/6486
摘要： A gyroscope comprises a piezoelectric substrate having a surface. Disposed on the surface are a resonator transducer, a pair of reflectors, a structure such as a metallic dot, and a sensor transducer. The resonator transducer creates a first surface acoustic wave on the surface. The pair of reflectors reflects the first surface acoustic wave to form a standing wave within a region of the surface between the pair of reflectors. The structure is disposed on the surface within the region, wherein a Coriolis force acting upon the structure creates a second surface acoustic wave. The sensor senses the second surface acoustic wave and provides an output indicative thereof.
摘要翻译：陀螺仪包括具有表面的压电基片。表面上设置有谐振器换能器，一对反射器，诸如金属点的结构和传感器换能器。谐振器传感器在表面上产生第一声表面波。一对反射器反射第一表面声波以在该对反射器之间的表面的区域内形成驻波。该结构设置在区域内的表面上，其中作用在该结构上的科里奥利力产生第二表面声波。传感器感测第二表面声波并提供表示其的输出。

3. 发明授权

US5296666A Microwave heating apparatus having two cavities and method of using the same 失效
标题翻译：具有两个腔的微波加热装置及其使用方法
公开(公告)号：US5296666A
公开(公告)日：1994-03-22
申请号：US877852
申请日：1992-05-04
申请人： Vijay K. Varadan , Vasundara V. Varadan , Thomas L. Schaffer
发明人： Vijay K. Varadan , Vasundara V. Varadan , Thomas L. Schaffer
IPC分类号： E04G21/16 , H05B6/80
CPC分类号： H05B6/80
摘要： A system is provided for heating non-metallic material or a discrete layer of the non-metallic material. Microwave energy is introduced into an enclosure defining a first cavity and capable of substantially containing the microwave energy. A semiconductive sheet is positioned at the bottom of the first cavity. Thermal insulation overlies the semiconductive sheet. A second cavity is defined by the undersurface of the semiconductive sheet and flexible microwave shielding in the form of a skirt which is attached to, and depends from, the enclosure. The flexible shielding is composed of a material which also substantially contains the microwave energy. The semiconductive sheet is effective to convert some of the microwave energy into thermal energy and to transmit the thermal energy into the second cavity while transmitting the remainder of the microwave energy directly to the discrete layer, thereby rapidly heating the discrete layer. The system includes a carriage with a handle for moving the apparatus across a surface of the non-metallic material and for adjusting the height of the semiconductive sheet above the surface of the non-metallic material.
摘要翻译：提供用于加热非金属材料或非金属材料的离散层的系统。将微波能量引入到限定第一腔并且能够基本上包含微波能量的外壳中。半导体片位于第一腔的底部。隔热层覆盖半导体薄片。第二空腔由半导体薄片的下表面和裙部形式的柔性微波屏蔽限定，裙部的外壳连接到外壳上，并且与外壳相连。柔性屏蔽由基本上包含微波能量的材料组成。半导体薄片有效地将一些微波能量转换成热能并将热能传递到第二腔中，同时将剩余的微波能直接传递到离散层，由此快速加热离散层。该系统包括具有手柄的滑架，用于使装置移动穿过非金属材料的表面，并用于调节半导体薄片在非金属材料表面上方的高度。

4. 发明授权

US06525691B2 Miniaturized conformal wideband fractal antennas on high dielectric substrates and chiral layers 失效
$Miniaturized conformal wideband fractal antennas on high dielectric substrates and chiral layers$
公开(公告)号：US06525691B2
公开(公告)日：2003-02-25
申请号：US09894973
申请日：2001-06-28
申请人： Vijay K. Varadan , Kalarickaparambil Vinoy , Jose A. Kollakompil , Vasundara V. Varadan
发明人： Vijay K. Varadan , Kalarickaparambil Vinoy , Jose A. Kollakompil , Vasundara V. Varadan
IPC分类号： H01Q138
CPC分类号： H01Q3/44 , H01Q1/36 , H01Q9/40 , H01Q15/0093
摘要： A class of antennas that comprise an electrically conductive fractal pattern disposed on a dielectric substrate and are capable of construction in a size measured in centimeters as compared to previous antennas of the same class that measured in meters. One antenna style has a ground plane that is perpendicular to the substrate and another style has a ground plane that is parallel to the substrate. The substrate has a dielectric constant of in the range of about 10 to 600 or more and may be a ferroelectric, such as barium strontium titanate. A bias voltage applied across the substrate can tune the antenna for operation in a particular frequency range. The antenna can be made especially wideband by placing an absorbing material behind the substrate. The fractal pattern may be any fractal pattern, such as Hilbert curve, Koch curve, Sierpinski gasket and Sierpinski carpet. One style of the antenna uses a fractal pattern that has a plurality of segments arranged in a first configuration and a switch disposed to alter the first configuration to one or more other configurations. The antenna elements may also be arranged in a phased array.

5. 发明授权

US5557286A Voltage tunable dielectric ceramics which exhibit low dielectric constants and applications thereof to antenna structure 失效
标题翻译：具有低介电常数的电压可调电介质陶瓷及其应用于天线结构
公开(公告)号：US5557286A
公开(公告)日：1996-09-17
申请号：US260053
申请日：1994-06-15
申请人： Vijay K. Varadan , Fathi Selmi , Vasundara V. Varadan
发明人： Vijay K. Varadan , Fathi Selmi , Vasundara V. Varadan
IPC分类号： H01Q1/38 , H01Q13/28
CPC分类号： H01Q1/38 , H01Q13/28
摘要： An improved BST dielectric powder is created used a sol-gel procedure. Addition of graphite to the powder, followed by a firing of the mixture results in a highly porous BST substrate, with the included graphite being burned off. By adjustment of the amount of added graphite, the porosity of the BST substrate is widely adjustable and enables achievement of a low bulk dielectric constant. A low dielectric filler is added to the fired substrate so as to provide a composite substrate with physical rigidity. Conductive layers are then adhered to the composite substrate to enable a tuning of the dielectric constant in accordance with applied DC voltage potentials. Antenna and other applications of the improved composite BST substrate are described.
摘要翻译：使用溶胶 - 凝胶法制备改进的BST介电粉末。向粉末中加入石墨，然后烧结混合物，得到高度多孔的BST基材，其中包括的石墨被烧掉。通过调整添加石墨的量，BST基板的孔隙度可以广泛调节，可实现较低的体积介电常数。将低介电填料加入到烧制的基材中，以提供具有物理刚度的复合基材。然后将导电层粘合到复合衬底上，以便根据所施加的直流电压电位调谐介电常数。描述了改进的复合BST基板的天线和其它应用。

6. 发明授权

US4948922A Electromagnetic shielding and absorptive materials 失效
标题翻译：电磁屏蔽和吸收材料
公开(公告)号：US4948922A
公开(公告)日：1990-08-14
申请号：US252516
申请日：1988-09-30
申请人： Vijay K. Varadan , Vasundara V. Varadan
发明人： Vijay K. Varadan , Vasundara V. Varadan
IPC分类号： H05K9/00
CPC分类号： H05K9/009 , H05K9/0015
摘要： A material having a matrix and a plurality of inclusions which are chiral is effective as a coating to reduce incident reflections and absorptions of microwave frequency electromagnetic energy. The matrix can use an electrically conductive polymeric material as the base as well as any other low loss dielectric material. Chiral inclusions may be in the form of helices or any other small object displaying handedness. Moreover, it is possible to use electrically conductive polymeric materials by themselves as absorbers of electromagnetic energy. There are a variety of uses for these materials and the unique properties including gaskets for controlling the emission of microwave energy from electronic enclosures.
摘要翻译：具有矩阵和多个手性夹杂物的材料作为减少微波频率电磁能的入射反射和吸收的涂层是有效的。该基质可以使用导电聚合物材料作为基底以及任何其它低损耗介电材料。手性夹杂物可以是螺旋形的形式或任何其他显示手性的小物体。此外，可以将导电聚合物材料本身用作电磁能的吸收剂。这些材料有各种用途，以及独特的性能，包括用于控制电子外壳的微波能量发射的垫圈。

7. 发明授权

US5668744A Active noise control using piezoelectric sensors and actuators 失效
标题翻译：使用压电传感器和执行器进行主动噪声控制
公开(公告)号：US5668744A
公开(公告)日：1997-09-16
申请号：US437122
申请日：1995-05-05
申请人： Vijay K. Varadan , Vasundara V. Varadan , Xiao-Qi Bao , Kenneth B. Carney , John L. Olinger , Fred S. Coffey
发明人： Vijay K. Varadan , Vasundara V. Varadan , Xiao-Qi Bao , Kenneth B. Carney , John L. Olinger , Fred S. Coffey
IPC分类号： G10K11/178 , H03F1/26
CPC分类号： G10K11/1788 , G10K2210/10 , G10K2210/3032 , G10K2210/3045 , G10K2210/511
摘要： A method for reducing noise generated by the operation of a noise-producing machine includes sensing the noise of the machine with a piezoelectric sensor, sending an activation signal, responsive to the sensed noise of the machine, to activate a piezoelectric actuator to reduce the noise of the machine, where the piezoelectric actuator is independent of a wave guide. Further, a parameter of the machine indicative of the speed of the machine is sensed with a second sensor, and the activation signal is corrected, responsive to the sensed parameter of the machine, to optimize the noise reduction of the piezoelectric material.
摘要翻译：一种用于降低噪声产生机的操作产生噪音的方法包括用压电传感器检测机器的噪声，响应于感测到的机器噪声发送激活信号，激活压电致动器以减小噪声的机器，其中压电致动器独立于波导。此外，用第二传感器检测指示机器速度的机器的参数，并且响应于机器的感测参数来校正激活信号，以优化压电材料的噪声降低。

8. 发明授权

US5366664A Electromagnetic shielding materials 失效
标题翻译：电磁屏蔽材料
公开(公告)号：US5366664A
公开(公告)日：1994-11-22
申请号：US878153
申请日：1992-05-04
申请人： Vijay K. Varadan , Vasundara V. Varadan , Neil R. Williams , Joseph W. Cresko
发明人： Vijay K. Varadan , Vasundara V. Varadan , Neil R. Williams , Joseph W. Cresko
IPC分类号： H01B1/20 , H01B1/22 , H01B1/24 , H05K1/02 , H05K1/09 , H05K3/28 , H05K9/00 , H01B1/00
CPC分类号： H05K9/0083 , H01B1/20 , H01B1/22 , H01B1/24 , H05K1/0218 , H05K1/095 , H05K3/284 , Y10T428/2913 , Y10T428/2927 , Y10T428/2982 , Y10T428/31801
摘要： The present invention provides for conductive electromagnetic shielding (EMS) compositions which can be formulated to provide effective shielding over a broad range of frequencies, e.g. 30 MHz. to 110 GHz. which is based on a mixture of a polymeric or liquid matrix material and a synergestic combination of conductive powders, fibers and optional flake components. The invention also provides for formulations containing the above composition which are adapted for EMS applications such as pliable caulking, thermoformable shaped articles such as housings and cabinetry, flexible gasket material, shielding curtains, coatings and paints which may be applied to substrates such as glass, plastic or metal, structural composites, conformal coatings for printed circuit boards and like applications.
摘要翻译：本发明提供导电电磁屏蔽（EMS）组合物，其可以配制成在宽范围的频率例如， 30 MHz。至110 GHz。其基于聚合物或液体基质材料的混合物和导电粉末，纤维和任选的片状组分的协同组合。本发明还提供了含有上述组合物的制剂，其适用于EMS应用，例如柔韧的填缝，可热成形的制品例如壳体和橱柜，柔性衬垫材料，屏蔽帘，涂层和涂料，其可以施加到诸如玻璃，塑料或金属，结构复合材料，印刷电路板和类似应用的保形涂层。

9. 发明申请

US20190379125A1 FREESPACE ANTENNA MEASUREMENT SYSTEM 审中-公开
公开(公告)号：US20190379125A1
公开(公告)日：2019-12-12
申请号：US16146317
申请日：2018-09-28
申请人： Vasundara V. Varadan
发明人： Vasundara V. Varadan
IPC分类号： H01Q13/02 , H01Q19/06 , G01R29/10
摘要： Embodiments of the present invention may provide an antenna characterization system. The system may include a horn antenna including a waveguide and a horn section with an open end and at least one lens disposed at the open end of the horn antenna, having a focal length. The system may also include a platform to hold an antenna under test (AUT) positioned at substantially distance x from the open end of the horn antenna, wherein x is the sum of the focal length and a far-field distance property of the AUT. The system may further include an analyzer coupled to the horn antenna to measure a radiation pattern and other properties such as EIRP, TRP, EVR and spurious emission of a passive or active AUT.

10. 发明授权

US06984332B2 Method for making a micro-electro-mechanical gyroscope 失效
标题翻译：制造微机电陀螺仪的方法
公开(公告)号：US06984332B2
公开(公告)日：2006-01-10
申请号：US10309566
申请日：2002-12-04
申请人： Vijay K. Varadan , Pascal B Xavier , William D. Suh , Jose A Kollakompil , Vasundara V Varadan
发明人： Vijay K. Varadan , Pascal B Xavier , William D. Suh , Jose A Kollakompil , Vasundara V Varadan
IPC分类号： H01L21/00 , G01P3/00
CPC分类号： G01C19/5698 , H03H9/02645 , H03H9/6486
摘要： A gyroscope comprises a piezoelectric substrate having a surface. Disposed on the surface are a resonator transducer, a pair of reflectors, a structure such as a metallic dot, and a sensor transducer. The resonator transducer creates a first surface acoustic wave on the surface. The pair of reflectors reflects the first surface acoustic wave to form a standing wave within a region of the surface between the pair of reflectors. The structure is disposed on the surface within the region, wherein a Coriolis force acting upon the structure creates a second surface acoustic wave. The sensor senses the second surface acoustic wave and provides an output indicative thereof.
摘要翻译：陀螺仪包括具有表面的压电基片。表面上设置有谐振器换能器，一对反射器，诸如金属点的结构和传感器换能器。谐振器传感器在表面上产生第一声表面波。一对反射器反射第一表面声波以在该对反射器之间的表面的区域内形成驻波。该结构设置在区域内的表面上，其中作用在该结构上的科里奥利力产生第二表面声波。传感器感测第二表面声波并提供表示其的输出。

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