CA2320667A1 - Compact wideband waveguide twist transition - Google Patents
Compact wideband waveguide twist transition Download PDFInfo
- Publication number
- CA2320667A1 CA2320667A1 CA 2320667 CA2320667A CA2320667A1 CA 2320667 A1 CA2320667 A1 CA 2320667A1 CA 2320667 CA2320667 CA 2320667 CA 2320667 A CA2320667 A CA 2320667A CA 2320667 A1 CA2320667 A1 CA 2320667A1
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- waveguide
- opening
- twist
- waveguides
- section
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Abstract
A compact, wideband twist junction which allows the joining of two rectangular waveguides that are rotated relative to each other about a common axis, while maintaining a lower return loss over a full standard waveguide band. The device provides low return loss over the full standard waveguide band in a short physical length equal to approximately one-quarter of the waveguide wavelength.
The device consists of a plate having an opening formed therein, with the opening having a characteristic bow tie shape rotated approximately half -way between the orientations of the two main waveguides.
The device consists of a plate having an opening formed therein, with the opening having a characteristic bow tie shape rotated approximately half -way between the orientations of the two main waveguides.
Description
COMPACT WIDEBAI~~ WAVEGUIDE TWIST TRANSITION
BACKGROUND OF THE INVENTION
The present invention relates to a junction placed between hollow waveguides intended for transmission of electromagnetic waves.
Many different applications of electromagnetic energy transmission, especially at the microwave and higher frequency ranges, make use of hollow waveguides. It is often desirable to be able to twist the direction of the electrical field vector associated with energy traveling through such a waveguide. For example, it may be necessary to change the polarization of directional transmission paths between relay link sections to impart polarization differences between signals fed to different antenna elements, or packaging constraints may dictate that the field vector be rotated.
Wherever two sections of rectangular waveguide meet which are rotated on an axis relative to each other, for example at 90° with respect to one another, an intermediate waveguide transition section is typically required. This waveguide transition section or "twist" provides a low return loss for the transition.
In fact, without any such transition section, in the case where the two waveguides are rotated exactly 90° relative to each other, 100% energy reflection will occur at the junction for all radio frequencies.
One common way of ensuring low reflection is to insert a section of actual twisted waveguide between the two main waveguides. This section is twisted about the axis of the waveguide in such a manner as to maintain a given cross-section along its length. This type of waveguide twisted section is a standard product offered by most waveguide component manufacturers. The section of twisted waveguide must normally be kept sufficiently long to provide a smooth, gradual transition to ensure that the desired propagating waveguide mode undergoes negligible reflection.
BACKGROUND OF THE INVENTION
The present invention relates to a junction placed between hollow waveguides intended for transmission of electromagnetic waves.
Many different applications of electromagnetic energy transmission, especially at the microwave and higher frequency ranges, make use of hollow waveguides. It is often desirable to be able to twist the direction of the electrical field vector associated with energy traveling through such a waveguide. For example, it may be necessary to change the polarization of directional transmission paths between relay link sections to impart polarization differences between signals fed to different antenna elements, or packaging constraints may dictate that the field vector be rotated.
Wherever two sections of rectangular waveguide meet which are rotated on an axis relative to each other, for example at 90° with respect to one another, an intermediate waveguide transition section is typically required. This waveguide transition section or "twist" provides a low return loss for the transition.
In fact, without any such transition section, in the case where the two waveguides are rotated exactly 90° relative to each other, 100% energy reflection will occur at the junction for all radio frequencies.
One common way of ensuring low reflection is to insert a section of actual twisted waveguide between the two main waveguides. This section is twisted about the axis of the waveguide in such a manner as to maintain a given cross-section along its length. This type of waveguide twisted section is a standard product offered by most waveguide component manufacturers. The section of twisted waveguide must normally be kept sufficiently long to provide a smooth, gradual transition to ensure that the desired propagating waveguide mode undergoes negligible reflection.
However, there are certain disadvantages to using this sort of waveguide twist, it being relatively expensive to manufacture, and it occupying substantially large space which may be unacceptable for certain applications. For example, to maintain low return loss over the full desired bandwidth, a minimum length of several guide wave-lengths is typically required.
Transition sections are also available which can accomplish the 90° twist function in a substantially reduced length. For example, there is a so-called single section quarter-wave step-twist transition. This type of transition section consists of a one-quarter wavelength long waveguide having a rectangular cross-section which is normally identical to that of the rectangular waveguides to be joined. The short length of waveguide is oriented at a 45° angle relative to each of the two main waveguides. In practice, this type of single section quarter-wave step transition is not normally fabricated from a length of actual waveguide, but is instead machined from a solid metal block. It may also include an integral flange with threads or through-holes to enable screws to fasten it to the flanges of each of the two waveguides. This single section quarter-wave step-twist transition with rectangular cross-section can provide low reflection transition, but typically over only a narrow bandwidth which is a fraction of the full operating capability of the waveguides themselves.
So-called mufti-section step twists find application where wider bandwidth is required. These consist of two or more such quarter-wave sections having identical rectangular cross-section with each section rotated about an integral multiple fraction of 90°. Disadvantages of a mufti-section step twist implementation are (1) a high cost of fabrication due to the need to machine complex parts at precise angles and (2) the fact that the multiple section step twist, while shorter than a twisted waveguide section, is still longer than a single section device. Consequently, the step twist transition may still be larger than is desirable for certain intended end uses.
Transition sections are also available which can accomplish the 90° twist function in a substantially reduced length. For example, there is a so-called single section quarter-wave step-twist transition. This type of transition section consists of a one-quarter wavelength long waveguide having a rectangular cross-section which is normally identical to that of the rectangular waveguides to be joined. The short length of waveguide is oriented at a 45° angle relative to each of the two main waveguides. In practice, this type of single section quarter-wave step transition is not normally fabricated from a length of actual waveguide, but is instead machined from a solid metal block. It may also include an integral flange with threads or through-holes to enable screws to fasten it to the flanges of each of the two waveguides. This single section quarter-wave step-twist transition with rectangular cross-section can provide low reflection transition, but typically over only a narrow bandwidth which is a fraction of the full operating capability of the waveguides themselves.
So-called mufti-section step twists find application where wider bandwidth is required. These consist of two or more such quarter-wave sections having identical rectangular cross-section with each section rotated about an integral multiple fraction of 90°. Disadvantages of a mufti-section step twist implementation are (1) a high cost of fabrication due to the need to machine complex parts at precise angles and (2) the fact that the multiple section step twist, while shorter than a twisted waveguide section, is still longer than a single section device. Consequently, the step twist transition may still be larger than is desirable for certain intended end uses.
SUMMARY OF THE INVENTION
What is needed is a configuration to accomplish a waveguide twist function through a significant angular twist of the electric field, such as 90°, while maintaining a low return loss over a full operating bandwidth of the waveguide sections. The solution should at the same time be of a minimum physical length equal to approximately one-quarter of a waveguide wavelength referenced at the low frequency end of the waveguide band. Furthermore, the device should be easy to manufacture on standard machining equipment.
Briefly, the present invention accomplishes these objectives by the use of a single section, quarter-wave step-twist transition having a precisely defined complex cross-sectional interior shape. The shape is generally of the same rectangular shape as the corresponding waveguides. However, the interior opening is accentuated in one or more ways. For example, the corners of the opening are positioned outboard of the corners of the corresponding standard waveguide. In addition, the longer pair of opposing sides are indented slightly inward at a center vertex. The characteristic shape of the opening thus resembles a bow tie.
The center axis of the precisely defined shape is rotated with respect to both waveguides. For example, in the case of two rectangular waveguides having their axes rotated 90° with respect to one another, an axis of symmetry of the complex cross-section waveguide is rotated at 45 ° relative to the two main orthogonal waveguides.
In an optional configuration, other outwardly extending vertices may be added to the short opposing sides of the opening to elongate the shape and further provide advantageous electrical performance.
BRIEF DESCRIPTION OF THE DRAWINGS
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular description of preferred embodiments of the invention, as illustrated in the accompanying drawings in which like reference characters refer to the same parts throughout the different views. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention.
What is needed is a configuration to accomplish a waveguide twist function through a significant angular twist of the electric field, such as 90°, while maintaining a low return loss over a full operating bandwidth of the waveguide sections. The solution should at the same time be of a minimum physical length equal to approximately one-quarter of a waveguide wavelength referenced at the low frequency end of the waveguide band. Furthermore, the device should be easy to manufacture on standard machining equipment.
Briefly, the present invention accomplishes these objectives by the use of a single section, quarter-wave step-twist transition having a precisely defined complex cross-sectional interior shape. The shape is generally of the same rectangular shape as the corresponding waveguides. However, the interior opening is accentuated in one or more ways. For example, the corners of the opening are positioned outboard of the corners of the corresponding standard waveguide. In addition, the longer pair of opposing sides are indented slightly inward at a center vertex. The characteristic shape of the opening thus resembles a bow tie.
The center axis of the precisely defined shape is rotated with respect to both waveguides. For example, in the case of two rectangular waveguides having their axes rotated 90° with respect to one another, an axis of symmetry of the complex cross-section waveguide is rotated at 45 ° relative to the two main orthogonal waveguides.
In an optional configuration, other outwardly extending vertices may be added to the short opposing sides of the opening to elongate the shape and further provide advantageous electrical performance.
BRIEF DESCRIPTION OF THE DRAWINGS
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular description of preferred embodiments of the invention, as illustrated in the accompanying drawings in which like reference characters refer to the same parts throughout the different views. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention.
Fig. 1 is an isometric view of a waveguide junction and associated waveguides according to the invention.
Fig. 2 is a front view of a preferred embodiment of a waveguide junction according to the invention.
Fig. 3 is a chart illustrating a calculated performance for the design of Fig.
2.
Fig. 4 illustrates measured electrical performance from actual hardware fabricated to the design of Fig. 2.
Fig. 5 illustrates a design variation in which an extra pair of vertices are added to the outer short ends.
Fig. 6 is a chart of calculated performance for the embodiment of Fig. 5.
DETAILED DESCRIPTION OF THE INVENTION
Fig. 1 is an isometric representation of how two electromagnetic waveguides are coupled with a waveguide junction according to the invention. The first waveguide 10 consisting of a main rectangular body 11 and flange 12. A second waveguide section 16 having a main body 17 and flange 18 is coupled to the first waveguide 10 by a waveguide twist junction 20. Waveguide sections 10 and 16 may, for example, be WR-28 industry standard rectangular waveguides having normal inside dimensions of 0.140 by 0.280 inches and a standard operating bandwidth of 26.5 GigaHertz (GHz) through 40 GHz. It should be understood that the invention may be used with other standard rectangular waveguide specifications ranging from the bands WR-42 through WR-04. For larger waveguides, the concept may be impractical because of the increased mass of the waveguide twist plate 20.
In any event, the waveguides 10 and 16 are connected to one another through the expediency of having threaded holes 14 drilled in the flanges respective flanges 12 and 18. The holes 14 are conveniently located at specified positions such as in the corners of the waveguide flanges. The two waveguide sections 10 and 16 are fastened to one another using screws or other fasteners 19 placed through the holes 14 in the flanges 12 and 18 as well as through holes 21 formed in the periphery of the waveguide twist 20.
$-The waveguide twist 20 consists of a section of material which is typically of a thickness, L, of one-quarter wavelength referenced at the low end of the standard operating frequency band of operation.
The slot or internal cross-section 22 of the waveguide twist 20 is a precisely $ defined shape similar to a bow tie. The major axis .A1 of the bow tie is rotated 4$°
relative to the major axes A2 and A3 of the respective waveguides 10 and 16.
This major axis A1 of symmetry of the bow tie shaped slot 22 is thus rotated in a manner similar to previously known single step transition twists.
Fig. 2 is a more detailed view of the twist plate 20 as implemented for two WR-28 waveguide sections disposed at a 90° angle. The drawing of Fig. 2 in particular shows the bow tie shape of the slot 22 in more detail. As can be seen, the bow tie shaped slot 22 is symmetrical about the axis A1. The characteristic bow tie shape is generally defined with respect to a rotated outline 28 of the corresponding waveguide. In particular, the corners 32 of the bow tie are located outboard of 1$ where the standard waveguide corners would be located. In addition, the two longer opposing sides are indented at a vertex 30.
The bow tie shape is precisely defined by the following table of offsets referenced to the center point 34 for the numbered points in the drawing of Fig. 2 for application again with the WR-28 waveguide:
POINT "X" AXIS "Y" AXIS
1 +.045 -.045 2 +.150 +.003 3 +.159 +,053 4 +.053 +.159 5 +,003 +.150 6 -.045 +.045 7 -.150 -.003 8 -.159 -.053 9 -.053 -.1.59 10 -.003 -.1.50 11 +.045 -.045 Table 1 The dimensions of Table 1 are specified with respect to the center point 34.
The twist plate 20 is typically machined from a solid block of material. The material used for the twist plate 20 may be brass or other suitable metal used in fabricating waveguide components. The thickness T of the block may, for example, be 0.172 inches for the WR-28 waveguide. The major dimensions W and H are both 0.75 inches.
The outline of the bow tie 22 is thus made up of only straight lines and four circular arcs all having the same diameter to allow for simple machining. The corners 32 of the rectangle are preferably filleted by the same amount, at a radius of about 0.031 inches, to further expedite machining.
In other embodiments, the corners 32 might be square; in such an instance, the vertices 30 might need to be in a slightly different position to achieve the same performance.
Fig. 3 illustrates a calculated performance for the particular design shown in Fig. 2, and Fig. 4 shows actual measured performance from hardware fabricated to this design. The measured response of Fig. 4 illustrates both insertion loss (at 0.5 dB per division scale) on the upper trace as well as return loss (at a ~ dB
per division scale) on the lower trace. The device exhibits better than a 23 decibel (dB) return loss over all but the very high end of the 26.5 GHz through 40 GHz band. The measured response does not show deeper nulls in the return loss indicated in the calculated response. This is probably a result of minor misalignments which are present in the actual measurement setup and of imperfections in the machining.
In the particular bow tie twist design of Fig. 2, even the calculated return loss is greater than 20 dB at 40 GHz, which is the very high end of the WR-28 band.
Fig. S illustrates a design variation developed for improved full waveguide band response. This implementation is a more general version of a bow tie shape having an extra pair of vertices 40 added at the distal end points along the major axis Al. The ttvo additional vertices 40 are shaped to the same radius as the four corners 32, again to simplify the machining process.
Although a model has not been fabricated to this design, its calculated performance is shown in Fig. 6. This plot shows that for the full WR-28 waveguide band from 26.5 GHz to 40 GHz and even above that band, a better than 30 dB
return loss is indicated. Somewhat less performance would be expected from a working model, because as the calculated return loss becomes smaller, mechanical precision becomes more and more critical to achieve the desired result. The expectation is that from 25 to 27 dB worst case across the full waveguide band is a realistic possibility.
A linear scaling of dimensions allows application of this design to other waveguide sizes, provided that the waveguide of interest has a width and height in a precise 2 to 1 ratio. This is the case for most standard rectangular waveguides but other standard bands such as WR-42 and WR-90 are known to depart from the 2 to waveguide size ratio. For ratios other than precisely 2 to 1, an optimal bow tie cross-sectional shape would be slightly different from what would be obtained from a simple linear scaling of the designs presented here. However, the optimal dimensions could be determined through same calculation procedures.
Similarly, dimensions could be calculated for twist angles other than 90°.
However, 90° is typically the most commonly used angle for a waveguide twist and is also the most demanding angle for which to achieve lower return loss over the full g-operating bandwidth, because it represents the angle for which there is greatest overall change in the waveguide mode from one waveguide 10 to the other 16.
While an exact analytical description of the operating device 20 is not known precisely, it is observed however that the bow tie slot 22 is relatively large in area and therefore supports multiple propagating modes at the higher end of the waveguide band. This over-moded characteristic most likely plays an important role in the devices ability to achieve the desired performance.
While this invention has been particularly shown and described with references to preferred embodiments thereof, it will be understood by those skilled 10 in the art that various changes in form and details may be made therein without departing from the scope of the invention encompassed by the appended claims.
Fig. 2 is a front view of a preferred embodiment of a waveguide junction according to the invention.
Fig. 3 is a chart illustrating a calculated performance for the design of Fig.
2.
Fig. 4 illustrates measured electrical performance from actual hardware fabricated to the design of Fig. 2.
Fig. 5 illustrates a design variation in which an extra pair of vertices are added to the outer short ends.
Fig. 6 is a chart of calculated performance for the embodiment of Fig. 5.
DETAILED DESCRIPTION OF THE INVENTION
Fig. 1 is an isometric representation of how two electromagnetic waveguides are coupled with a waveguide junction according to the invention. The first waveguide 10 consisting of a main rectangular body 11 and flange 12. A second waveguide section 16 having a main body 17 and flange 18 is coupled to the first waveguide 10 by a waveguide twist junction 20. Waveguide sections 10 and 16 may, for example, be WR-28 industry standard rectangular waveguides having normal inside dimensions of 0.140 by 0.280 inches and a standard operating bandwidth of 26.5 GigaHertz (GHz) through 40 GHz. It should be understood that the invention may be used with other standard rectangular waveguide specifications ranging from the bands WR-42 through WR-04. For larger waveguides, the concept may be impractical because of the increased mass of the waveguide twist plate 20.
In any event, the waveguides 10 and 16 are connected to one another through the expediency of having threaded holes 14 drilled in the flanges respective flanges 12 and 18. The holes 14 are conveniently located at specified positions such as in the corners of the waveguide flanges. The two waveguide sections 10 and 16 are fastened to one another using screws or other fasteners 19 placed through the holes 14 in the flanges 12 and 18 as well as through holes 21 formed in the periphery of the waveguide twist 20.
$-The waveguide twist 20 consists of a section of material which is typically of a thickness, L, of one-quarter wavelength referenced at the low end of the standard operating frequency band of operation.
The slot or internal cross-section 22 of the waveguide twist 20 is a precisely $ defined shape similar to a bow tie. The major axis .A1 of the bow tie is rotated 4$°
relative to the major axes A2 and A3 of the respective waveguides 10 and 16.
This major axis A1 of symmetry of the bow tie shaped slot 22 is thus rotated in a manner similar to previously known single step transition twists.
Fig. 2 is a more detailed view of the twist plate 20 as implemented for two WR-28 waveguide sections disposed at a 90° angle. The drawing of Fig. 2 in particular shows the bow tie shape of the slot 22 in more detail. As can be seen, the bow tie shaped slot 22 is symmetrical about the axis A1. The characteristic bow tie shape is generally defined with respect to a rotated outline 28 of the corresponding waveguide. In particular, the corners 32 of the bow tie are located outboard of 1$ where the standard waveguide corners would be located. In addition, the two longer opposing sides are indented at a vertex 30.
The bow tie shape is precisely defined by the following table of offsets referenced to the center point 34 for the numbered points in the drawing of Fig. 2 for application again with the WR-28 waveguide:
POINT "X" AXIS "Y" AXIS
1 +.045 -.045 2 +.150 +.003 3 +.159 +,053 4 +.053 +.159 5 +,003 +.150 6 -.045 +.045 7 -.150 -.003 8 -.159 -.053 9 -.053 -.1.59 10 -.003 -.1.50 11 +.045 -.045 Table 1 The dimensions of Table 1 are specified with respect to the center point 34.
The twist plate 20 is typically machined from a solid block of material. The material used for the twist plate 20 may be brass or other suitable metal used in fabricating waveguide components. The thickness T of the block may, for example, be 0.172 inches for the WR-28 waveguide. The major dimensions W and H are both 0.75 inches.
The outline of the bow tie 22 is thus made up of only straight lines and four circular arcs all having the same diameter to allow for simple machining. The corners 32 of the rectangle are preferably filleted by the same amount, at a radius of about 0.031 inches, to further expedite machining.
In other embodiments, the corners 32 might be square; in such an instance, the vertices 30 might need to be in a slightly different position to achieve the same performance.
Fig. 3 illustrates a calculated performance for the particular design shown in Fig. 2, and Fig. 4 shows actual measured performance from hardware fabricated to this design. The measured response of Fig. 4 illustrates both insertion loss (at 0.5 dB per division scale) on the upper trace as well as return loss (at a ~ dB
per division scale) on the lower trace. The device exhibits better than a 23 decibel (dB) return loss over all but the very high end of the 26.5 GHz through 40 GHz band. The measured response does not show deeper nulls in the return loss indicated in the calculated response. This is probably a result of minor misalignments which are present in the actual measurement setup and of imperfections in the machining.
In the particular bow tie twist design of Fig. 2, even the calculated return loss is greater than 20 dB at 40 GHz, which is the very high end of the WR-28 band.
Fig. S illustrates a design variation developed for improved full waveguide band response. This implementation is a more general version of a bow tie shape having an extra pair of vertices 40 added at the distal end points along the major axis Al. The ttvo additional vertices 40 are shaped to the same radius as the four corners 32, again to simplify the machining process.
Although a model has not been fabricated to this design, its calculated performance is shown in Fig. 6. This plot shows that for the full WR-28 waveguide band from 26.5 GHz to 40 GHz and even above that band, a better than 30 dB
return loss is indicated. Somewhat less performance would be expected from a working model, because as the calculated return loss becomes smaller, mechanical precision becomes more and more critical to achieve the desired result. The expectation is that from 25 to 27 dB worst case across the full waveguide band is a realistic possibility.
A linear scaling of dimensions allows application of this design to other waveguide sizes, provided that the waveguide of interest has a width and height in a precise 2 to 1 ratio. This is the case for most standard rectangular waveguides but other standard bands such as WR-42 and WR-90 are known to depart from the 2 to waveguide size ratio. For ratios other than precisely 2 to 1, an optimal bow tie cross-sectional shape would be slightly different from what would be obtained from a simple linear scaling of the designs presented here. However, the optimal dimensions could be determined through same calculation procedures.
Similarly, dimensions could be calculated for twist angles other than 90°.
However, 90° is typically the most commonly used angle for a waveguide twist and is also the most demanding angle for which to achieve lower return loss over the full g-operating bandwidth, because it represents the angle for which there is greatest overall change in the waveguide mode from one waveguide 10 to the other 16.
While an exact analytical description of the operating device 20 is not known precisely, it is observed however that the bow tie slot 22 is relatively large in area and therefore supports multiple propagating modes at the higher end of the waveguide band. This over-moded characteristic most likely plays an important role in the devices ability to achieve the desired performance.
While this invention has been particularly shown and described with references to preferred embodiments thereof, it will be understood by those skilled 10 in the art that various changes in form and details may be made therein without departing from the scope of the invention encompassed by the appended claims.
Claims (8)
1. A waveguide twist section for joining two sections of hollow waveguide in which a first waveguide section has a major dimensional axis and a second waveguide has a major dimensional axis which is arranged at an angle with respect to the first waveguide dimensional axis, the twist section comprising a twist element having an opening rotated such that its major axis is oriented between the major axes of the first and second waveguides, the opening of a generally rectangular shape, the opening thus having a pair of opposing long and short sides with the corners of the opening positioned outboard of corresponding corners in the two waveguide sections.
2. An apparatus as in claim 1 wherein the opening has a generally characteristic bow tie shape.
3. An apparatus as in claim 1 wherein the long sides of the opening have a central vertex positioned inboard of the corresponding long side of the waveguide sections.
4. An apparatus is in claim 1 wherein the short sides of the opening have an additional vertex such that the opening is elongated along its major axis.
5. An apparatus in claim 1 wherein the first and second waveguides are disposed so that their major axes are positioned at 90° with respect to one another.
6. An apparatus is in claim 1 wherein the waveguide sections are rectangular.
7. An apparatus is in claim 1 wherein the twist plate has a thickness of approximately one-quarter wavelength of a lower frequency range of operation of the waveguide.
8. An apparatus is in claim 1 wherein the corners of the opening are filleted.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US40608299A | 1999-09-27 | 1999-09-27 | |
| US09/406,082 | 1999-09-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2320667A1 true CA2320667A1 (en) | 2001-03-27 |
Family
ID=23606473
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2320667 Abandoned CA2320667A1 (en) | 1999-09-27 | 2000-09-26 | Compact wideband waveguide twist transition |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2320667A1 (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007057389A1 (en) * | 2005-11-17 | 2007-05-24 | Ericsson Ab | T-shape waveguide twist-transformer |
| WO2007110110A1 (en) * | 2006-03-27 | 2007-10-04 | Telefonaktiebolaget Lm Ericsson (Publ) | Waveguide junction |
| WO2009136139A3 (en) * | 2008-04-19 | 2010-01-21 | Raven Manufacturing Limited | Data transmitting and/or receiving apparatus |
| WO2010106198A1 (en) * | 2009-03-18 | 2010-09-23 | Radiacion Y Microondas, S.A. | Polarisation rotator with multiple bowtie-shaped sections |
| WO2011101502A1 (en) | 2010-02-16 | 2011-08-25 | Radiacion Y Microondas, S.A. | Polarisation rotator with multiple bowtie-shaped sections |
| CN111029709A (en) * | 2019-12-30 | 2020-04-17 | 南京驰韵科技发展有限公司 | Preparation process of 90-degree ultrathin rotary twisted waveguide |
| CN114221106A (en) * | 2021-11-16 | 2022-03-22 | 北京无线电测量研究所 | Step waveguide |
| CN115441141A (en) * | 2022-10-17 | 2022-12-06 | 北京星英联微波科技有限责任公司 | Stepped twisted waveguide |
| CN115473022A (en) * | 2022-07-13 | 2022-12-13 | 电子科技大学 | Microwave filtering torsional waveguide easy for CNC realization |
| CN115732873A (en) * | 2022-11-17 | 2023-03-03 | 电子科技大学 | Ultra-wideband thin-sheet 90-degree twisted waveguide |
-
2000
- 2000-09-26 CA CA 2320667 patent/CA2320667A1/en not_active Abandoned
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007057389A1 (en) * | 2005-11-17 | 2007-05-24 | Ericsson Ab | T-shape waveguide twist-transformer |
| CN101322283B (en) * | 2005-11-17 | 2011-11-09 | 爱立信股份有限公司 | T-shape waveguide twist-transformer |
| US7808337B2 (en) | 2005-11-17 | 2010-10-05 | Ericsson Ab | T-shape waveguide twist-transformer |
| US7978020B2 (en) | 2006-03-27 | 2011-07-12 | Telefonaktiebolaget Lm Ericsson (Publ) | Waveguide junction having angular and linear offsets for providing polarization rotation |
| WO2007110110A1 (en) * | 2006-03-27 | 2007-10-04 | Telefonaktiebolaget Lm Ericsson (Publ) | Waveguide junction |
| US8686812B2 (en) | 2008-04-19 | 2014-04-01 | Raven Manufacturing Limited | Data transmitting and/or receiving apparatus |
| WO2009136139A3 (en) * | 2008-04-19 | 2010-01-21 | Raven Manufacturing Limited | Data transmitting and/or receiving apparatus |
| WO2010106198A1 (en) * | 2009-03-18 | 2010-09-23 | Radiacion Y Microondas, S.A. | Polarisation rotator with multiple bowtie-shaped sections |
| WO2011101502A1 (en) | 2010-02-16 | 2011-08-25 | Radiacion Y Microondas, S.A. | Polarisation rotator with multiple bowtie-shaped sections |
| CN111029709A (en) * | 2019-12-30 | 2020-04-17 | 南京驰韵科技发展有限公司 | Preparation process of 90-degree ultrathin rotary twisted waveguide |
| CN111029709B (en) * | 2019-12-30 | 2021-05-28 | 南京驰韵科技发展有限公司 | Preparation process of 90-degree ultrathin rotary twisted waveguide |
| CN114221106A (en) * | 2021-11-16 | 2022-03-22 | 北京无线电测量研究所 | Step waveguide |
| CN115473022A (en) * | 2022-07-13 | 2022-12-13 | 电子科技大学 | Microwave filtering torsional waveguide easy for CNC realization |
| CN115473022B (en) * | 2022-07-13 | 2023-08-18 | 电子科技大学 | Microwave filtering twisted waveguide easy for CNC realization |
| CN115441141A (en) * | 2022-10-17 | 2022-12-06 | 北京星英联微波科技有限责任公司 | Stepped twisted waveguide |
| CN115732873A (en) * | 2022-11-17 | 2023-03-03 | 电子科技大学 | Ultra-wideband thin-sheet 90-degree twisted waveguide |
| CN115732873B (en) * | 2022-11-17 | 2023-07-21 | 电子科技大学 | Ultra-wideband sheet type 90-degree twisted waveguide |
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