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公开(公告)号：US11239555B2
公开(公告)日：2022-02-01
申请号：US16595961
申请日：2019-10-08
Applicant: Wisconsin Alumni Research Foundation
Inventor： Nader Behdad , John H. Booske , Hung Thanh Luyen
Abstract: A phase shift element includes a first dielectric layer, a conductive layer, a second dielectric layer, a conducting pattern layer, switches, and vertical interconnect accesses (vias). Each conductor of a plurality of conductors of the conducting pattern layer is orthogonal to two other conductors. Each switch is switchable between a conducting position and a non-conducting position. Each via is connected to a single conductor. The first conductive material reflects an electromagnetic wave incident on the conducting pattern layer and on the second dielectric layer. When a switch is in the conducting position, the switch electrically connects two conductors to each other through their respective vias. A plurality of different switch configurations of the switches provide a 2-bit phase quantization on the reflected electromagnetic wave relative to the electromagnetic wave incident on the conducting pattern layer when the electromagnetic wave is incident on the conducting pattern layer.
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公开(公告)号：US10862210B2
公开(公告)日：2020-12-08
申请号：US16362947
申请日：2019-03-25
Applicant: Wisconsin Alumni Research Foundation
Inventor： Nader Behdad , John H. Booske , Hung Thanh Luyen , Zongtang Zhang
Abstract: A multiple band phase shifter includes a first dielectric layer, a conductive layer, a second dielectric layer, and for each central operating frequency of a plurality of central operating frequencies, a switch, a plurality of vias, and a conducting pattern layer. Each via is formed of a conductive material that extends through the first dielectric layer, through a third dielectric material formed in and through the conductive layer, and through the second dielectric layer and is connected to a first throw arm or a second throw arm of the switch. The conducting pattern layer includes conductors electrically connected to a distinct via. An electric polarization of a reflected electromagnetic wave is rotated by 90 degrees when the switch is positioned in the first conducting position and the electric polarization of the reflected electromagnetic wave is rotated by −90 degrees when the switch is positioned in the second conducting position.
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公开(公告)号：US10520575B2
公开(公告)日：2019-12-31
申请号：US15606811
申请日：2017-05-26
Applicant: Wisconsin Alumni Research Foundation
Inventor： Bahareh Behzadnezhad , Nader Behdad , Alan B. McMillan
Abstract: A system and method for an electron paramagnetic resonance imaging (EPRI) system includes a magnet configured to apply a static magnetic field to a subject to be imaged and a gradient coil configured to apply a magnetic field gradient to the static magnetic field. The system also includes a parallel plate waveguide (PPWG) configured to use a traveling wave to generate a radio frequency (RF) magnetic field over a volume of interest (VOI) in the subject to elicit EPRI data from the VOI and a processor configured to reconstruct the EPRI data into an image of the VOI.
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公开(公告)号：US09640867B2
公开(公告)日：2017-05-02
申请号：US14672632
申请日：2015-03-30
Applicant: Wisconsin Alumni Research Foundation
Inventor： Nader Behdad , John Booske
CPC classification number: H01Q3/32 , H01P1/18 , H01Q3/36 , H01Q21/061
Abstract: A tunable phase shifter is provided that includes a spatial phase shift element and a conducting sheet. The spatial phase shift element includes a dielectric substrate and a conductive antenna element mounted on the dielectric substrate. The conducting sheet is mounted a distance from the spatial phase shift element and configured to reflect an electromagnetic wave through the spatial phase shift element. The conductive antenna element is configured to radiate a second electromagnetic wave in response to receipt of the reflected electromagnetic wave. The distance between the conducting sheet and the spatial phase shift element can be changed to adjust a phase shift of the reflected electromagnetic wave.
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公开(公告)号：US20160294054A1
公开(公告)日：2016-10-06
申请号：US14672632
申请日：2015-03-30
Applicant: Wisconsin Alumni Research Foundation
Inventor： Nader Behdad , John Booske
IPC: H01Q3/32
CPC classification number: H01Q3/32 , H01P1/18 , H01Q3/36 , H01Q21/061
Abstract: A tunable phase shifter is provided that includes a spatial phase shift element and a conducting sheet. The spatial phase shift element includes a dielectric substrate and a conductive antenna element mounted on the dielectric substrate. The conducting sheet is mounted a distance from the spatial phase shift element and configured to reflect an electromagnetic wave through the spatial phase shift element. The conductive antenna element is configured to radiate a second electromagnetic wave in response to receipt of the reflected electromagnetic wave. The distance between the conducting sheet and the spatial phase shift element can be changed to adjust a phase shift of the reflected electromagnetic wave.
Abstract translation: 提供了包括空间相移元件和导电片的可调谐移相器。 空间相移元件包括电介质基板和安装在电介质基板上的导电天线元件。 导电片与空间相移元件安装一段距离，并且被配置成通过空间相移元件反射电磁波。 导电天线元件被配置为响应于接收到反射的电磁波而辐射第二电磁波。 可以改变导电片和空间相移元件之间的距离，以调整反射的电磁波的相移。
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Patent Agency Ranking
公开(公告)号：US20230216193A1
公开(公告)日：2023-07-06
申请号：US17567965
申请日：2022-01-04
Applicant: Wisconsin Alumni Research Foundation
Inventor： Mohammad Mahdi Honari Kalateh , Nader Behdad , John H. Booske
CPC classification number: H01Q3/46 , H01Q19/108
Abstract: A phase shift element includes an antenna, a first dielectric layer, a ground plane mounted to a first surface of the first dielectric layer, a reflecting circuit, and a single antenna-reflector line connected between the antenna and the reflecting circuit through the ground plane and the first dielectric layer. The antenna-reflector line is formed of a conducting material. The reflecting circuit is mounted to a second surface of the first dielectric layer. The first surface is opposite the second surface. The reflecting circuit is configured to reflect a signal received on the single antenna-reflector line from the antenna back to the antenna on the single antenna-reflector line. The reflecting circuit is further configured to be switchable between two different impedance levels that each provide a different phase shift when the signal is reflected by the reflecting circuit.
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公开(公告)号：US20230216191A1
公开(公告)日：2023-07-06
申请号：US17568015
申请日：2022-01-04
Applicant: Wisconsin Alumni Research Foundation
Inventor： Mohammad Mahdi Honari Kalateh , Nader Behdad , John H. Booske
CPC classification number: H01Q3/36 , H03H7/18 , H01Q1/48 , H01Q19/10 , H01Q9/0407
Abstract: A phase shift element includes an antenna, a first dielectric layer, a ground plane mounted to a first surface of the first dielectric layer, a reflecting circuit, and a single antenna-reflector line connected between the antenna and the reflecting circuit through the ground plane and the first dielectric layer. The antenna-reflector line is formed of a conducting material. The reflecting circuit is mounted to a second surface of the first dielectric layer. The first surface is opposite the second surface. The reflecting circuit is configured to reflect a signal received on the single antenna-reflector line from the antenna back to the antenna on the single antenna-reflector line. The reflecting circuit is further configured to be switchable between four different impedance levels that each provide a different phase shift when the signal is reflected by the reflecting circuit.
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公开(公告)号：US20200243968A1
公开(公告)日：2020-07-30
申请号：US16362947
申请日：2019-03-25
Applicant: Wisconsin Alumni Research Foundation
Inventor： Nader Behdad , John H. Booske , Hung Thanh Luyen , Zongtang Zhang
Abstract: A multiple band phase shifter includes a first dielectric layer, a conductive layer, a second dielectric layer, and for each central operating frequency of a plurality of central operating frequencies, a switch, a plurality of vias, and a conducting pattern layer. Each via is formed of a conductive material that extends through the first dielectric layer, through a third dielectric material formed in and through the conductive layer, and through the second dielectric layer and is connected to a first throw arm or a second throw arm of the switch. The conducting pattern layer includes conductors electrically connected to a distinct via. An electric polarization of a reflected electromagnetic wave is rotated by 90 degrees when the switch is positioned in the first conducting position and the electric polarization of the reflected electromagnetic wave is rotated by −90 degrees when the switch is positioned in the second conducting position.
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公开(公告)号：US10707581B2
公开(公告)日：2020-07-07
申请号：US15860943
申请日：2018-01-03
Applicant: Wisconsin Alumni Research Foundation
Inventor： Yahya Mohtashami , Nader Behdad , Susan C. Hagness
Abstract: An antenna includes a first dipole arm and a second dipole arm. The first dipole arm is connected to a first conductor and is formed of a first conducting material. The first dipole arm extends in an axial direction from the first conductor. The second dipole arm is connected to a second conductor that is distinct from the first conductor and is formed of a second conducting material. The second dipole arm extends in the axial direction from the second conductor and is wound around the first dipole arm to form a number of loops. The second dipole arm does not contact the first dipole arm. An axial length of the second dipole arm in the axial direction is less than 90% of an axial length of the first dipole arm in the axial direction.
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公开(公告)号：US20180261922A1
公开(公告)日：2018-09-13
申请号：US15454170
申请日：2017-03-09
Applicant: Wisconsin Alumni Research Foundation
Inventor： Nader Behdad , Susan C. Hagness , Yahya Mohtashami
CPC classification number: A61B18/1815 , A61B2018/00577 , A61B2018/00785 , A61B2018/1853
Abstract: An antenna system is provided that includes a coaxial cable, an antenna, a reflector wall, and a slot wall. The reflector wall is formed of a conductive material connected to a conductive shield to extend in an axial direction, is separated from an antenna conductor by a second dielectric material in a radial direction relative to the antenna conductor, and partially surrounds the antenna conductor in the radial direction from a first angle to a second angle when projected into a radial plane. The slot wall is formed through a portion of the conductive shield to expose a dielectric material from a third angle to a fourth angle when projected into the radial plane, is formed on a first side relative to a base. The first angle, the second angle, the third angle, and the fourth angle are defined relative to a common axis parallel to the radial plane.
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