EP2797160A1 - Rotary joint for millimeter wave scanning systems - Google Patents
Rotary joint for millimeter wave scanning systems Download PDFInfo
- Publication number
- EP2797160A1 EP2797160A1 EP13165015.2A EP13165015A EP2797160A1 EP 2797160 A1 EP2797160 A1 EP 2797160A1 EP 13165015 A EP13165015 A EP 13165015A EP 2797160 A1 EP2797160 A1 EP 2797160A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotary joint
- mode
- signal
- antenna
- waveguide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/06—Movable joints, e.g. rotating joints
- H01P1/062—Movable joints, e.g. rotating joints the relative movement being a rotation
- H01P1/066—Movable joints, e.g. rotating joints the relative movement being a rotation with an unlimited angle of rotation
- H01P1/067—Movable joints, e.g. rotating joints the relative movement being a rotation with an unlimited angle of rotation the energy being transmitted in only one line located on the axis of rotation
Definitions
- the invention relates to a rotary joint for millimeter wave scanning imaging systems for generating images of objects by using electromagnetic waves with wavelengths in the millimeter range.
- a food scanning device using electromagnetic RF radiation is disclosed in DE 10 2009 047300 A1 . It has a source for generation for RF radiation and directing this radiation to a food article. The reflected radiation is received by a receiver and analyzed to obtain information about the composition of the food.
- a scanning imaging system using millimeter waves is disclosed in US 2002/0044276 A1 .
- a scanning reflector is used to sweep through a periodic scan pattern to redirect millimeter wave energy from a target object to a detector.
- the problem to be solved by the invention is to provide a rotary joint system for a millimeter wave scanner for continuous scanning of objects.
- a further object is to provide a comparatively simple, cost-efficient, and maintenance-free rotary joint.
- Another object of the invention is to provide a rotary joint, which transfers electromagnetic waves with a constant and scanning angle independent polarization.
- a rotary joint system for coupling millimeter wave signals or other radio frequency signals from a stationary transmitter to a rotating antenna.
- the rotary joint system comprises a rotary joint and a mode converter.
- An input signal to the rotary joint system is a signal from a transmitter, being guided in a rectangular waveguide, propagating in H 10 mode.
- This input signal is converted by the mode converter into a H 11 mode in a circular waveguide.
- This signal is further forwarded to a circular H 11 rotary joint coupling the signal to the rotating side into a further circular waveguide and the antenna.
- the orientation (or polarization) of the electromagnetic field in this circular waveguide is identical with respect to the stationary transmitter. It does not rotate with rotation and therefore allows the antenna to radiate a signal with a constant polarization independent of the rotation angle.
- the mode converter may be omitted, if the transmitter is able to generate a H 11 mode signal in a circular waveguide.
- the antenna is a circular antenna.
- the terms “circular waveguide” and “circular antenna” relate to waveguides and antennas having an approximately circular cross section. Such antennas may further have a conical shape.
- a first embodiment of a rotary joint 10 is shown in a sectional view.
- the rotary joint 10 comprises a first body section 11 and a second body section 12 rotatably mounted together by a first bearing 13 and a second bearing 14. Threaded holes 15 and 16 are provided for flange screws.
- Threaded holes 15 and 16 are provided for flange screws.
- a first waveguide section 21 and a second waveguide section 22 separated by a narrow gap 23 are provided.
- at least one choke (not shown here) may be provided.
- Fig. 2 the first embodiment of a rotary joint is shown in a top view as seen from the left side in figure 1 .
- FIG. 3 the first embodiment of a rotary joint is shown in a bottom view as seen from the right side in figure 1 .
- further mounting holes (26) for mounting the flange of the rotary joint can be seen.
- Fig. 4 a schematic diagram of a rotary joint system is shown.
- the electromagnetic waves generated by transmitter 39 are coupled by means of a first stationary rectangular waveguide 36 to a mode converter 35.
- a cross-section of each waveguide together with the preferred transmission mode is shown.
- the first stationary rectangular waveguide 36 has a rectangular cross-section, and its preferred propagation mode is H 10 .
- the mode converter 35 converts the H 10 mode received by the rectangular waveguide 36 into an H 11 mode in a stationary circular waveguide 34.
- the H 11 mode signal from the circular waveguide is coupled by the rotary joint 33 to another H 11 mode in rotating circular waveguide 32.
- the signal propagating there through is emitted by antenna 31.
- a transmitter 39 which directly may generate H 11 mode signals into a circular waveguide.
Abstract
A rotary joint system is provided for coupling millimeter wave signals or other radio frequency signals from a stationary transmitter to a rotating antenna. The rotary joint system comprises a rotary joint and a mode converter. An input signal to the rotary joint system is a signal from a transmitter, being guided in a rectangular waveguide, propagating in H10 mode. This input signal is converted by the mode converter into a H11 mode in a circular waveguide. This signal is further forwarded to a circular H11 rotary joint coupling the signal to the rotating side into a further circular waveguide and the antenna. The orientation (or polarization) of the electromagnetic field in this circular waveguide is identical with respect to the stationary transmitter. It does not rotate with rotation and therefore allows the antenna to radiate a signal with a constant polarization independent of the rotation angle.
Description
- The invention relates to a rotary joint for millimeter wave scanning imaging systems for generating images of objects by using electromagnetic waves with wavelengths in the millimeter range.
- A food scanning device using electromagnetic RF radiation is disclosed in
DE 10 2009 047300 A1 - A scanning imaging system using millimeter waves is disclosed in
US 2002/0044276 A1 . Herein, a scanning reflector is used to sweep through a periodic scan pattern to redirect millimeter wave energy from a target object to a detector. - The problem to be solved by the invention is to provide a rotary joint system for a millimeter wave scanner for continuous scanning of objects. A further object is to provide a comparatively simple, cost-efficient, and maintenance-free rotary joint. Another object of the invention is to provide a rotary joint, which transfers electromagnetic waves with a constant and scanning angle independent polarization.
- Solutions of the problem are described in the independent claims. The dependent claims relate to further improvements of the invention.
- In a first embodiment, a rotary joint system is provided for coupling millimeter wave signals or other radio frequency signals from a stationary transmitter to a rotating antenna. The rotary joint system comprises a rotary joint and a mode converter. An input signal to the rotary joint system is a signal from a transmitter, being guided in a rectangular waveguide, propagating in H10 mode. This input signal is converted by the mode converter into a H11 mode in a circular waveguide. This signal is further forwarded to a circular H11 rotary joint coupling the signal to the rotating side into a further circular waveguide and the antenna. The orientation (or polarization) of the electromagnetic field in this circular waveguide is identical with respect to the stationary transmitter. It does not rotate with rotation and therefore allows the antenna to radiate a signal with a constant polarization independent of the rotation angle. The mode converter may be omitted, if the transmitter is able to generate a H11 mode signal in a circular waveguide.
- It is preferred, if the antenna is a circular antenna. Herein, the terms "circular waveguide" and "circular antenna" relate to waveguides and antennas having an approximately circular cross section. Such antennas may further have a conical shape.
- In the following, the invention will be described by way of example, without limitation of the general inventive concept, on examples of embodiment with reference to the drawings.
-
Fig. 1 shows a first embodiment of a rotary joint in a sectional view. -
Fig. 2 shows the first embodiment of a rotary joint in a top view. -
Fig. 3 shows the first embodiment of a rotary joint in a bottom view. -
Fig. 4 shows a schematic diagram of a rotary joint system. - In
Fig. 1 , a first embodiment of arotary joint 10 is shown in a sectional view. Therotary joint 10 comprises afirst body section 11 and asecond body section 12 rotatably mounted together by a first bearing 13 and a second bearing 14. Threadedholes first waveguide section 21 and asecond waveguide section 22 separated by a narrow gap 23 are provided. For electrically closing the gap, at least one choke (not shown here) may be provided. There may be at least onealignment pin - In
Fig. 2 , the first embodiment of a rotary joint is shown in a top view as seen from the left side infigure 1 . - In
Fig. 3 , the first embodiment of a rotary joint is shown in a bottom view as seen from the right side infigure 1 . Here, further mounting holes (26) for mounting the flange of the rotary joint can be seen. - In
Fig. 4 , a schematic diagram of a rotary joint system is shown. The electromagnetic waves generated bytransmitter 39 are coupled by means of a first stationaryrectangular waveguide 36 to amode converter 35. In this figure, a cross-section of each waveguide together with the preferred transmission mode is shown. Accordingly, the first stationaryrectangular waveguide 36 has a rectangular cross-section, and its preferred propagation mode is H10. Themode converter 35 converts the H10 mode received by therectangular waveguide 36 into an H11 mode in a stationarycircular waveguide 34. The H11 mode signal from the circular waveguide is coupled by therotary joint 33 to another H11 mode in rotatingcircular waveguide 32. The signal propagating there through is emitted byantenna 31. Instead of themode converter 35 and the first stationaryrectangular waveguide 36, there may be atransmitter 39, which directly may generate H11 mode signals into a circular waveguide.List of reference numerals 10 rotary joint 11 first body section 12 second body section 13 first bearing 14 second bearing 15 first threaded hole 16 second threaded hole 21 first waveguide section 22 second waveguide section 23 gap 24 first alignment pins 25 second alignment pins 26 mounting holes 31 antenna 32 circular waveguide 33 rotary joint 34 stationary circular waveguide 35 mode converter 36 stationary rectangular waveguide 39 transmitter
Claims (2)
- A rotary joint system for coupling millimeter wave signals from a stationary transmitter (39) to a rotating antenna (31) comprising:- a mode converter (35) for converting the signals of the transmitter into a H11 mode signal in a circular waveguide, and- a rotary joint (10, 33) for coupling the signals in H11 mode from the mode converter to the rotating antenna.
- Scanning imaging system according to claim 1,
characterized in that
the rotating antenna (31) is a circular cross sectioned antenna.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP13165015.2A EP2797160A1 (en) | 2013-04-23 | 2013-04-23 | Rotary joint for millimeter wave scanning systems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP13165015.2A EP2797160A1 (en) | 2013-04-23 | 2013-04-23 | Rotary joint for millimeter wave scanning systems |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2797160A1 true EP2797160A1 (en) | 2014-10-29 |
Family
ID=48182768
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13165015.2A Withdrawn EP2797160A1 (en) | 2013-04-23 | 2013-04-23 | Rotary joint for millimeter wave scanning systems |
Country Status (1)
Country | Link |
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EP (1) | EP2797160A1 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105186071A (en) * | 2015-09-30 | 2015-12-23 | 西安艾力特电子实业有限公司 | Novel one-way microwave rotary joint |
CN107039715A (en) * | 2017-05-23 | 2017-08-11 | 西安星展测控科技股份有限公司 | The gapless waveguide junction of contact |
CN107069151A (en) * | 2017-05-23 | 2017-08-18 | 西安星展测控科技股份有限公司 | A kind of waveguide junction of adjustable clearance |
CN107192987A (en) * | 2017-07-27 | 2017-09-22 | 南京俊禄科技有限公司 | A kind of marine radar transceiver device |
CN112290173A (en) * | 2020-10-12 | 2021-01-29 | 盐城市星地通信设备有限公司 | Contact type gapless waveguide rotary joint |
CN113809489A (en) * | 2021-08-13 | 2021-12-17 | 电子科技大学长三角研究院(湖州) | Terahertz full-duplex waveguide rotary joint based on diaphragm polarizer |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS639301A (en) * | 1986-06-30 | 1988-01-16 | Nec Corp | Waveguide device |
US20020044276A1 (en) * | 1998-08-05 | 2002-04-18 | Microvision, Inc. | Millimeter wave scanning imaging system |
EP1291965A1 (en) * | 2001-03-02 | 2003-03-12 | Mitsubishi Denki Kabushiki Kaisha | Antenna |
US20040135657A1 (en) * | 2002-04-02 | 2004-07-15 | Yoji Aramaki | Rotary joint |
-
2013
- 2013-04-23 EP EP13165015.2A patent/EP2797160A1/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS639301A (en) * | 1986-06-30 | 1988-01-16 | Nec Corp | Waveguide device |
US20020044276A1 (en) * | 1998-08-05 | 2002-04-18 | Microvision, Inc. | Millimeter wave scanning imaging system |
EP1291965A1 (en) * | 2001-03-02 | 2003-03-12 | Mitsubishi Denki Kabushiki Kaisha | Antenna |
US20040135657A1 (en) * | 2002-04-02 | 2004-07-15 | Yoji Aramaki | Rotary joint |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105186071A (en) * | 2015-09-30 | 2015-12-23 | 西安艾力特电子实业有限公司 | Novel one-way microwave rotary joint |
CN107039715A (en) * | 2017-05-23 | 2017-08-11 | 西安星展测控科技股份有限公司 | The gapless waveguide junction of contact |
CN107069151A (en) * | 2017-05-23 | 2017-08-18 | 西安星展测控科技股份有限公司 | A kind of waveguide junction of adjustable clearance |
CN107069151B (en) * | 2017-05-23 | 2022-02-25 | 星展测控科技股份有限公司 | Waveguide rotary joint with adjustable gap |
CN107039715B (en) * | 2017-05-23 | 2022-05-17 | 星展测控科技股份有限公司 | Contact type gapless waveguide rotary joint |
CN107192987A (en) * | 2017-07-27 | 2017-09-22 | 南京俊禄科技有限公司 | A kind of marine radar transceiver device |
CN112290173A (en) * | 2020-10-12 | 2021-01-29 | 盐城市星地通信设备有限公司 | Contact type gapless waveguide rotary joint |
CN112290173B (en) * | 2020-10-12 | 2021-07-20 | 盐城市星地通信设备有限公司 | Contact type gapless waveguide rotary joint |
CN113809489A (en) * | 2021-08-13 | 2021-12-17 | 电子科技大学长三角研究院(湖州) | Terahertz full-duplex waveguide rotary joint based on diaphragm polarizer |
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