JP5783072B2 - Power distribution type phase shifter and radio wave transmission system - Google Patents

Power distribution type phase shifter and radio wave transmission system Download PDF

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JP5783072B2
JP5783072B2 JP2012021758A JP2012021758A JP5783072B2 JP 5783072 B2 JP5783072 B2 JP 5783072B2 JP 2012021758 A JP2012021758 A JP 2012021758A JP 2012021758 A JP2012021758 A JP 2012021758A JP 5783072 B2 JP5783072 B2 JP 5783072B2
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portion
arc
outer
part
arm
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JP2012227911A (en
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村野 慎介
慎介 村野
田崎 修
修 田崎
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日立金属株式会社
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Description

  The present invention relates to a power distribution type phase shifter and a radio wave transmission system including the power distribution type phase shifter.

  The power distribution type phase shifter outputs a high frequency signal whose phase is changed from a plurality of output terminals according to a design power distribution ratio by mechanically changing the line length of the high frequency signal. This type of power distribution type phase shifter is used for a feeding system of a phased array antenna, for example.

  For example, a power distribution type phase shifter disclosed in Patent Document 1 includes first and second dielectric substrates, and the first dielectric substrate is provided with a signal output strip conductor and a signal input fixed strip conductor. ing. The signal output strip conductor has a ring shape and two output portions and is U-shaped, and the signal input fixed strip conductor extends in parallel with the output portion.

  A movable strip conductor is provided on the second dielectric substrate, and the movable strip conductor has an arm portion and a linear portion. The arm portion is rotatably connected to the signal input fixed strip conductor by a pin, and the linear portion has the same curvature as the annular portion of the signal output strip conductor. When the movable strip conductor rotates around the pin, the linear portion moves along the annular portion.

When a high frequency signal is input to the fixed strip conductor for signal input, a high frequency signal whose phase is changed is output from the two output sections in accordance with the rotation angle of the movable strip conductor.
Further, the linear portion has a width corresponding to the design power distribution ratio and a length of 1/4 of the wavelength of the design frequency or an odd multiple thereof. For this reason, a high frequency signal is output from each of the two output units according to the design power distribution ratio.

Japanese Patent Laid-Open No. 10-4305

  In the power distribution type phase shifter disclosed in Patent Document 1, even if the power distribution ratio can be adjusted to the desired power distribution ratio (design power distribution ratio) by setting the width of the linear portion, the return loss There is a problem that gets worse.

  The present invention has been made in view of the above circumstances, a power distribution type phase shifter that can be adjusted to a desired power distribution ratio without deteriorating return loss, and the power distribution type phase shift An object of the present invention is to provide a radio wave transmission system including a device.

  In order to achieve the above object, according to one aspect of the present invention, a first dielectric substrate and a rotation that is disposed opposite the first dielectric substrate and is perpendicular to the first dielectric substrate. A second dielectric substrate capable of relative rotation about an axis, and a first conductor pattern and a second conductor provided on each of the first dielectric substrate and the second dielectric substrate and facing each other with a dielectric layer interposed therebetween The first conductor pattern includes a first surrounding portion surrounding at least a part of the rotating shaft, and a first extending in the circumferential direction of the rotating shaft at a position spaced from the first surrounding portion. The second conductive pattern includes a second surrounding portion that surrounds at least a part of the rotating shaft and faces the first surrounding portion, and extends in a circumferential direction of the rotating shaft. A second arc portion facing the arc portion, the second go portion, and the second A power distribution type phase shifter comprising: a first arm portion and a second arm portion each extending between arc portions, wherein the first arm portion has a width different from that of the second arm portion. Is provided.

  As a preferred aspect, the first arm portion and the second arm portion extend away from each other toward the radially outer side, and are arranged on the radially outer side of the first arm portion and the second arm portion. The end is connected to the second arc portion.

  As a preferred aspect, radially outer ends of the first arm portion and the second arm portion are continuous with both ends of the second arc portion, and both ends of the second arc portion are directed radially outward. Accordingly, chamfering is performed so that the length of the second arc portion is shortened.

  As a preferred aspect, the first conductor pattern includes one or more first outer arc portions extending in a circumferential direction of the rotation shaft at a position spaced apart from the first arc portion on a radially outer side of the first arc portion. The second conductor pattern further includes at least one second outer arc portion extending radially outward of the second arc portion and extending in the circumferential direction of the rotation shaft and facing each of the first outer arc portions. And a first outer arm part and a second outer arm part extending between the second arc part and the second outer arc part or between the second outer arc parts, respectively, The outer arm portion has a width different from that of the second outer arm portion.

  As a preferred embodiment, the first outer arm portion and the second outer arm portion extend away from each other toward the outer side in the radial direction, and the first outer arm portion and the second outer arm portion The radially outer end is continuous with the second outer arc portion.

  As a preferred aspect, radially outer ends of the first outer arm portion and the second outer arm portion are continuous with both ends of the second arc portion, and both ends of the second outer arc portion are radially outer sides. Chamfering is performed so that the length of the second outer circular arc portion becomes shorter as it goes to.

  As a preferred embodiment, the first conductor pattern is connected to both ends of the input / output strip line extending linearly via the first surrounding portion, and the first arc portion and the first outer arc portion. A linear portion extending in parallel with the input / output strip line and forming an output strip line in cooperation with each of the first arc portion and the first outer arc portion; The high-frequency signal input to one end is output from the other end of the input / output strip line and one end of each of the linear portions.

According to another aspect of the present invention, the first dielectric substrate is disposed opposite to the first dielectric substrate, and is relative to the rotation axis perpendicular to the first dielectric substrate. A rotatable second dielectric substrate, and a first conductor pattern and a second conductor pattern provided on the first dielectric substrate and the second dielectric substrate, respectively, and facing each other across the dielectric layer. The first conductor pattern includes a first arc portion extending in a circumferential direction of the rotation shaft at a position spaced from the rotation shaft, and the second conductor pattern extends in a circumferential direction of the rotation shaft; A second arc portion facing the first arc portion; a first arm portion and a second arm portion extending between the rotation axis or the vicinity thereof and the second arc portion ; , Having a width different from that of the second arm portion. Distribution phase shifter is provided.
According to another aspect of the present invention, the radio wave comprises: the power distribution type phase shifter; and a phased array antenna having a plurality of antenna elements connected to the power distribution type phase shifter. A transmission system is provided.

  According to the present invention, a power distribution type phase shifter capable of matching a desired power distribution ratio without deteriorating return loss, and a radio wave transmission system including the power distribution type phase shifter are provided. .

1 is a diagram schematically illustrating a radio wave transmission system according to a first embodiment. It is a perspective view which decomposes | disassembles and shows schematically the electric power distribution type phase shifter of 1st Embodiment. It is a top view for demonstrating the shape of the 1st conductor pattern and the 2nd conductor pattern in the power distribution type phase shifter of 1st Embodiment. It is a figure which shows roughly the electromagnetic wave transmission system of 2nd Embodiment. It is a perspective view which decomposes | disassembles and shows schematically the electric power distribution type phase shifter of 2nd Embodiment. It is a top view for demonstrating the shape of the 1st conductor pattern and the 2nd conductor pattern in the electric power distribution type phase shifter of 2nd Embodiment. It is a top view for demonstrating the dimension of the 1st conductor pattern and the 2nd conductor pattern in the Example of the power distribution type phase shifter of 2nd Embodiment. (A) is a graph which shows the frequency dependence of the decibel value (LogMag) of the ratio of input power and each output power in the power distribution type phase shifter which has the dimension of FIG. 7, (b) is (a) ) Is an enlarged graph of the vertical axis.

[First Embodiment]
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram schematically showing a radio wave transmission system 10 according to the first embodiment.
The radio wave transmission system 10 includes a high frequency circuit (transmission circuit) 12, which generates a high frequency signal to be transmitted and is directed to a power distribution type phase shifter (hereinafter also simply referred to as a phase shifter) 14. Output. The phase shifter 14 divides the input high-frequency signal into a plurality of high-frequency signals each having an appropriate phase and power, and outputs them to a phased array antenna (hereinafter also referred to as PA antenna) 16.

  The PA antenna 16 has a plurality of antenna elements 18 arranged appropriately, and the antenna element 18 radiates an input high-frequency signal as a radio wave. In the present embodiment, the phase shifter 14 is, for example, a 1-input 3-output power distribution type phase shifter, and the PA antenna 16 has three antenna elements 18 corresponding to the number of outputs of the phase shifter 14. . Each antenna element 18 of the PA antenna 16 radiates radio waves having different phases and powers (intensities), whereby the PA antenna 16 radiates radio waves with specific directivity as a whole.

[Power distribution type phase shifter]
FIG. 2 is an exploded perspective view schematically showing the phase shifter 14.
The phase shifter 14 includes a first dielectric substrate 20 having a square shape, for example. The first dielectric substrate 20 is made of one type selected from the group consisting of glass epoxy and PTFE (polytetrafluoroethylene), for example.

  A ground layer 22 made of a conductor is provided on one surface of the first dielectric substrate 20 over the entire surface. The ground layer 22 is configured by, for example, a foil or a plating film made of a metal such as copper and laminated on the first dielectric substrate 20.

[First conductor pattern]
A first conductor pattern 24 having a predetermined shape is provided on the other surface of the first dielectric substrate 20. The first conductor pattern 24 can be produced, for example, by etching a foil or a plating film made of a metal such as copper and laminated on the surface of the first dielectric substrate 20.

The first conductor pattern 24 includes an input / output strip line 26 and an output strip line 28. The input / output strip line 26 extends straight from one end to the other along one side of the first dielectric substrate 20. The input / output strip line 26 includes an surrounding part (first surrounding part) 30 at the center in the longitudinal direction, and the inner peripheral edge of the surrounding part 30 constitutes a wall surface of the through hole 32. The through hole 32 penetrates the first dielectric substrate 20, the ground layer 22 and the input / output strip line 26 in the thickness direction of the first dielectric substrate 20.
In addition, although the surrounding part 30 has comprised cyclic | annular form seeing in a plane, circular arc shape and C-shape may be sufficient. That is, the surrounding portion 30 can be shaped to surround at least a part of the through hole 32. Further, the surrounding portion 30 can be provided apart from the through hole 32 without constituting the wall surface of the through hole 32.

  One end of the input / output strip line 26 is connected to a connector 34a fixed to the first dielectric substrate 20, and is connected to the high-frequency circuit 12 through the connector 34a. On the other hand, the other end of the input / output strip line 26 is connected to a connector 34b fixed to the first dielectric substrate 20, and is connected to the antenna element 18 through the connector 34b.

Therefore, in the following description, the portion of the input / output strip line 26 from the surrounding portion 30 to the connector 34a is also referred to as the input strip line 26a, and the portion from the surrounding portion 30 to the connector 34b is also referred to as the output strip line 26b. . According to such a definition, the input strip line 26 a and the output strip line 26 b are arranged coaxially via the surrounding portion 30.
The input strip line 26a and the output strip line 26b are provided with wide portions having appropriate shapes for adjusting the characteristic impedance.

The output strip line 28 is integrally connected to an arc portion (first arc portion) 36 extending in an arc shape with the center of the through hole 32 as a center of curvature, and both ends of the arc portion 36, and is parallel to the input / output strip line 26. A straight portion 38 extending in the direction is included. That is, the straight portion 38 is connected to both ends of the arc portion 36 and extends in parallel with the input / output strip line 26, and constitutes the output strip line 28 in cooperation with the arc portion 36.
The portion where the arc portion 36 and the straight portion 38 are connected is chamfered, and the arc on the radially inner side of the arc portion 36 and the side of the straight portion 38 are connected via a chamfer line 39. Yes.

The ends of the straight portions 38 and 38 are connected to connectors 34c and 34d fixed to the first dielectric substrate 20, and are connected to the antenna elements 18 and 18 through the connectors 34c and 34d, respectively.
Hereinafter, the connectors 34a, 34b, 34c, and 34d are also referred to as connectors 34.

  A dielectric sheet 40 is laminated on the first dielectric substrate 20 so as to cover the first conductor pattern 24. The dielectric sheet 40 is made of, for example, one type selected from the group consisting of ultrahigh molecular weight polyethylene, PTFE, FEP (tetrafluoroethylene / hexafluoropropylene copolymer), polyester, and the like. In the dielectric sheet 40, communication holes 42 are formed at positions corresponding to the through holes 32 of the first dielectric substrate 20.

  A second dielectric substrate 44 is disposed on the first dielectric substrate 20 with the dielectric sheet 40 interposed therebetween. The second dielectric substrate 44 is made of, for example, a kind selected from the group consisting of glass epoxy and PTFE, and has a substantially fan shape.

  A through hole 46 is provided at the top of the second dielectric substrate 44, and the through hole 46 communicates with the through hole 32 of the first dielectric substrate 20 through the communication hole 42 of the dielectric sheet 40. Then, a resin screw 48 is inserted into the through hole 32, the communication hole 42, and the through hole 46, and two nuts 50 are screwed to the tip of the screw 48. By the screw 48 and the nut 50, the second dielectric substrate 44 is connected to the first dielectric substrate 20 so as to be relatively rotatable with the screw 48 as a rotation axis. The relative rotation angle of the second dielectric substrate 44 with respect to the first dielectric substrate 20 is appropriately adjusted by, for example, an actuator (not shown).

[Second conductor pattern]
A second conductor pattern 52 having a predetermined shape is provided on the surface of the second dielectric substrate 44 on the first dielectric substrate 20 side. The second conductor pattern 52 can be produced, for example, by etching a foil or a plating film made of a metal such as copper and laminated on the surface of the first dielectric substrate 44.

  FIG. 3 is a schematic plan view showing the first conductor pattern 24 together with the shape of the second conductor pattern 52. In FIG. 3, the dielectric sheet 40 is omitted, and the second dielectric substrate 44 is indicated by a one-dot chain line.

As shown in FIG. 3, the second conductor pattern 52 has a substantially fan-shaped outer shape.
The through hole 46 formed in the second dielectric substrate 44 also penetrates the top portion of the second conductor pattern 52, and the top portion of the second conductor pattern 52 is the surrounding portion (second portion) that defines the wall surface of the through hole 46. A surrounding portion) 54. The surrounding portion 54 is disposed so as to face the surrounding portion 30 of the first conductor pattern 52.
The surrounding portion 54 has an annular shape when seen in a plan view, but, like the surrounding portion 30, can be shaped to surround at least a part of the through-hole 32, such as an arc shape or a C shape, It can also be provided apart from the through hole 32.

  The outer shape of the second conductor pattern 52 includes a part of the outer edge of the surrounding portion 54, two line segments (radial lines) 56 a and 56 b extending radially outward from the surrounding portion 54, and the center of the through hole 46. Is mainly constituted by an arc 58 having a center of curvature. The corners where the radial lines 56a and 56b should intersect with the arc 58 are chamfered, and the radial lines 56a and 56b are connected to the arc 58 via the chamfered lines 57a and 57b. The chamfered lines 57 a and 57 b extend across the arc portion 36 from the inside to the outside of the arc portion 36 of the first conductor pattern 24.

Further, a fan-shaped opening 60 is formed in the second conductor pattern 52, and the second conductor pattern 52 is configured by a closed loop surrounding the opening 60.
More specifically, the second conductor pattern 52 includes an arm portion (first arm portion) 64a positioned between a radial line 62a that defines the opening 60 and a radial line 56a, and a radial line 62b and a radial line that define the opening 60. An arm portion (second arm portion) 64b positioned between 56b and an arc portion 66 defining the opening 60 and an arc portion (second arc portion) 68 positioned between the arcs 58.

The arm portion 64 a and the arm portion 64 b extend linearly so as to be separated from each other toward the outer side in the radial direction, and are connected to both ends of the arc portion 68.
Here, the center of curvature of the arc 66 of the opening 60 coincides with the center (rotation center) of the through hole 46 and coincides with the center of curvature of the arc portion 36 and the arc 58, but in the second conductor pattern 52. The position of the opening 60 is biased toward the radial line 62a. For this reason, in this embodiment, the width of the arm part 64a in the direction orthogonal to the radial direction is narrower than the width of the arm part 64b.

  Thus, the width of the arm portion 64a is different from the width of the arm portion 64b because the width of each of the arm portions 64a and 64b is the ratio of power to be output from the connectors 34b, 34c and 34d (power This is because it is set according to the distribution ratio.

Further, when viewed in the radial direction, the arc 66 is located inside the arc portion 36, and the arc 58 is located outside the arc portion 36. Therefore, the width of the arc portion 68 in the radial direction is larger than the width of the arc portion 36.
Since the center of the arc portion 68 in the width direction coincides with the center of the arc portion 36 in the width direction, and the center of curvature of the arc portion 68 coincides with the center of curvature of the arc portion 36, the second dielectric substrate. When 44 rotates relative to the first dielectric substrate 20, the arc portion 68 moves along the arc portion 36 while facing the arc portion 36.
Note that the length of the circular arc portion 68 in the circumferential direction is gradually shortened toward the radially outer side by chamfering.

  The length of each of the arm portions 64a and 64b and the arc portion 68 at the center in the width direction is preferably set to an odd multiple of ¼ of the wavelength corresponding to the operating frequency, but is not necessarily limited thereto. Never happen.

  In the phase shifter 14 of the first embodiment described above, a desired power distribution ratio is achieved by making the widths of the two arm portions 64 a and 64 b different from each other in the second conductor pattern 52.

  On the other hand, in the phase shifter 14 of the first embodiment described above, the return loss is reduced by the second conductor pattern 52 being configured by a closed loop. That is, it is possible to match the desired power distribution ratio without deteriorating the return loss.

  Moreover, in the phase shifter 14 of 1st Embodiment mentioned above, since the cross | intersection part of the circular arc part 36 and the linear part 38 of the 1st conductor pattern 24 is chamfered, reduction of a return loss is achieved further. Yes.

  Furthermore, in the above-described phase shifter 14 of the first embodiment, both ends of the arc portion 68 of the second conductor pattern 52 are chamfered, so that the return loss is further reduced.

  Furthermore, in the phase shifter 14 of the first embodiment described above, the overall size can be reduced by setting the length of the arc portion 68 to be substantially the same as the length of the arm portions 64a and 64b.

[Second Embodiment]
Hereinafter, a second embodiment will be described. In the following description of the embodiments, the same or similar configurations as those of the preceding embodiments are denoted by the same names or the same reference numerals, and detailed description thereof is omitted.

FIG. 4 is a diagram schematically illustrating the radio wave transmission system 100 according to the second embodiment. In the radio wave transmission system 100, the phase shifter 102 is a 1-input 7-output power distribution type phase shifter. That is, the number of outputs of the phase shifter 102 can be selected according to the configuration of the radio wave transmission system, and may be two or more.
The PA antenna 104 of the radio wave transmission system 100 has seven antenna elements 18 corresponding to the number of outputs of the phase shifter 102.

FIG. 5 is an exploded perspective view schematically showing the phase shifter 102.
The first dielectric substrate 110 of the phase shifter 102 is larger than the first dielectric substrate 20 of the first embodiment, and the entire area of one surface is covered with the ground layer 112.
[First conductor pattern]
The first conductor pattern 114 provided on the other surface of the first dielectric substrate 110 has a second output in addition to the input / output strip line 26 and the output strip line (first output strip line) 28. A strip line 116 for output and a third strip line 118 for output.

Similar to the first output strip line 28, the second output strip line 116 includes an arc portion (first outer arc portion) 120 and straight portions 122 and 122. That is, the straight line portion 122 is connected to both ends of the arc portion 120 and extends in parallel with the input / output strip line 26, and constitutes the output strip line 116 in cooperation with the arc portion 120.
The center of curvature of the arc portion 120 coincides with the center of the through hole 32, and the radius of curvature of the arc portion 120 is larger than that of the arc portion 36. The straight portion 122 extends in parallel to the straight portion 38, and the length of the straight portion 122 is shorter than the length of the straight portion 38.

The third output strip line 118 also has an arc portion (first outer arc portion) 124 and straight portions 126 and 126. That is, the straight portion 126 is connected to both ends of the arc portion 124 and extends in parallel with the input / output strip line 26, and constitutes the output strip line 118 in cooperation with the arc portion 124.
The center of curvature of the arc portion 124 coincides with the center of the through hole 32, and the radius of curvature of the arc portion 124 is larger than that of the arc portions 36 and 120. That is, the arc portions 36, 120, and 124 are arranged concentrically. The straight portion 126 extends in parallel with the straight portions 38 and 122, and the length of the straight portion 126 is shorter than the length of the straight portions 38 and 122.

Connectors 34e, 34f, 34g, and 34h are connected to both ends of the second output strip line 116 and the third output strip line 118, respectively, and the second output strip line 116 and the third output strip line are connected. The line 118 is connected to the antenna element 18 through the connectors 34e, 34f, 34g, and 34h.
In addition, the arc on the radially inner side of the arc portion 120 and the side of the straight portion 122, and the arc on the radially inner side of the arc portion 124 and the side of the straight portion 126 are also connected through chamfered lines 128 and 129, respectively. Yes.

  The dielectric sheet 130 is larger than the dielectric sheet 40 in accordance with the size of the first dielectric substrate 110 and covers the first conductor pattern 114.

  The length of the second dielectric substrate 132 is also extended from the second dielectric substrate 44 in accordance with the radius of curvature of the arc portion 124. For this reason, the second dielectric substrate 132 has a substantially pentagonal elongated outer shape partially including a curve.

[Second conductor pattern]
A second conductor pattern 134 is provided on the surface of the second dielectric substrate 132 on the first dielectric substrate 110 side.
FIG. 6 is a schematic plan view showing the first conductor pattern 114 together with the shape of the second conductor pattern 134. In FIG. 6, the dielectric sheet 130 is omitted, and the second dielectric substrate 132 is indicated by a one-dot chain line.

As shown in FIG. 3, the second conductor pattern 134 includes a first region 140, a second region 142, and a third region 144, and the first region 140 includes the second conductor pattern 52 and the second region 140. Have substantially the same shape.
The second region 142 is continuous with the radially outer side of the arc portion 68 of the first region 140. More specifically, the second region 142 has a substantially fan-shaped outer shape, and the top of the second region 142 overlaps the arc portion 68 of the second conductor pattern 52.

  The outer shape of the second region 142 is mainly composed of two radial lines 146a and 146b extending radially outward from the arc 58 of the first region 140 and an arc 148 having a center of curvature at the center of the through hole 46. It is configured. The corners where the radius lines 146a and 146b and the arc 148 should be chamfered are chamfered, and the radius lines 146a and 146b are connected to the arc 148 via the chamfer lines 150a and 150b. The chamfer lines 150 a and 150 b extend across the arc portion 120 from the inside to the outside of the arc portion 120 of the first conductor pattern 114.

In addition, a fan-shaped opening 152 is formed in the second region 142, and the second region 142 is configured by a closed loop surrounding the opening 152.
More specifically, the second region 142 includes an arm portion (first outer arm portion) 158a positioned between a radius line 154a defining the opening 152 and a radius line 146a, and a radius line 154b defining the opening 152 and a radius. It has an arm part (second outer arm part) 158b located between the lines 146b and an arc part (second outer arc part) 160 located between the arc 156 defining the opening 152 and the arc 148. The arm part 158a and the arm part 158b extend between the arc part 68 and the arc part 160, respectively.

The arm portion 158a and the arm portion 158b extend linearly so as to be separated from each other toward the outer side in the radial direction, and are connected to both ends of the arc portion 160.
Here, the center of curvature of the arc 156 of the opening 152 coincides with the center of the through hole 46 and coincides with the center of curvature of the arc portion 120 and the arc 148, but in the second region 142, The position is biased toward the radial line 146a. For this reason, the width | variety of the arm part 158a in the direction orthogonal to a radial direction is narrower than the width | variety of the arm part 158b.

Further, when viewed in the radial direction, the arc 156 is located inside the arc portion 120, and the arc 148 is located outside the arc portion 120. Accordingly, the width of the arc portion 160 in the direction along the radial direction is larger than the width of the arc portion 120.
Since the center of the arc portion 160 in the width direction coincides with the center of the arc portion 120 in the width direction, and the center of curvature of the arc portion 160 coincides with the center of curvature of the arc portion 120, the second dielectric substrate. When 132 rotates relative to the first dielectric substrate 110, the arc portion 160 moves along the arc portion 120 while facing the arc portion 120.
In addition, the length of the circular arc part 160 in the circumferential direction is gradually shortened toward the radially outer side by chamfering.

  The third region 144 continues to the radially outer side of the arc portion 160 of the second region 142. More specifically, the third region 144 has a substantially fan-shaped outer shape, and the top of the third region 144 overlaps the arc portion 160 of the second region 142.

  The outer shape of the third region 144 is mainly composed of two radial lines 162a and 162b extending radially outward from the arc 148 of the second region 142 and an arc 164 having the center of the through hole 46 as the center of curvature. It is configured. The corners where the radius lines 162a and 162b and the arc 164 intersect are chamfered, and the radius lines 162a and 162b are connected to the arc 164 via the chamfer lines 166a and 166b. The chamfered lines 166a and 166b extend across the arc portion 124 from the inside to the outside of the arc portion 124 of the first conductor pattern 114.

In addition, a fan-shaped opening 168 is formed in the third region 144, and the third region 144 is configured by a closed loop surrounding the opening 168.
More specifically, the third region 144 includes an arm portion (first outer arm portion) 174a positioned between the radius line 170a defining the opening 168 and the radius line 162a, and a radius line 170b defining the opening 168 and the radius. It has an arm part (second outer arm part) 174b located between the lines 162b and an arc part 172 defining the opening 168 and an arc part (second outer arc part) 176 located between the arcs 164. The arm part 174a and the arm part 174b extend between the arc part 160 and the arc part 176, respectively.

The arm part 174a and the arm part 174b extend linearly so as to be separated from each other toward the outer side in the radial direction, and are connected to both ends of the arc part 160.
Here, the center of curvature of the arc 172 of the opening 168 coincides with the center of the through hole 46 and coincides with the center of curvature of the arc portion 124 and the arc 164, but in the third region 144, The position is biased toward the radial line 162a. For this reason, the width of the arm portion 174a in the direction orthogonal to the radial direction is narrower than the width of the arm portion 174b.

Further, when viewed in the radial direction, the arc 172 is located inside the arc portion 124 and the arc 164 is located outside the arc portion 124. Accordingly, the width of the arc portion 176 in the direction along the radial direction is larger than the width of the arc portion 124.
Since the center of the arc portion 176 in the width direction coincides with the center of the arc portion 124 in the width direction, and the center of curvature of the arc portion 176 coincides with the center of curvature of the arc portion 120, the second dielectric substrate. When 132 rotates relative to the first dielectric substrate 110, the arc portion 176 moves along the arc portion 124 while facing the arc portion 124.
In addition, the length of the circular arc part 176 in the circumferential direction is gradually shortened toward the radially outer side by chamfering.

  Thus, the width of the arm portion 64a is different from the width of the arm portion 64b, the width of the arm portion 158a is different from the width of the arm portion 158b, and the width of the arm portion 174a is different from the width of the arm portion 174b. The width of each of the arm portions 64a, 64b, 158a, 158b, 174a, 174b is the ratio of the power to be output from the connectors 34b, 34c, 34d, 34e, 34f, 34g, 34h (power distribution ratio). ).

  In the phase shifter 102 of the second embodiment described above, in the second conductor pattern 134, between the arm part 64a and the arm part 64b, between the arm part 158a and the arm part 158b, and between the arm part 174a and the arm part 174b. The desired power distribution ratio is achieved by the different widths.

  On the other hand, in the above-described phase shifter 102 of the second embodiment, the return loss is reduced because the second conductor pattern 134 is configured by a closed loop. That is, it is possible to match the desired power distribution ratio without deteriorating the return loss.

  Moreover, in the phase shifter 102 of 2nd Embodiment mentioned above, since the part which circular arc part 36,120,124 and linear part 38,122,126 cross | intersect is chamfered in the 1st conductor pattern 114, more The return loss is further reduced.

  Further, in the above-described phase shifter 102 of the second embodiment, since both ends of the arc portions 68, 160, 164 of the second conductor pattern 134 are chamfered, the return loss is further reduced.

  Moreover, in the phase shifter 102 of 2nd Embodiment mentioned above, the 1st thru | or 3rd area | region 140,142,144 each sector-shaped center angle and the 1st area | region 140 with respect to the 1st area | region 140 in the circumferential direction of a sector shape. The desired power distribution ratio and good return loss can also be achieved by setting the connection position of the second region 142 and the connection position of the third region 144 with respect to the second region 142.

Hereinafter, examples of the phase shifter 102 of the second embodiment will be described.
1. Configuration (1) Material The materials used are as follows.
First dielectric substrate 110 and second dielectric substrate 132
Thickness: 1.6 mm, relative dielectric constant: 3.425
The ground layer 112, the first conductor pattern 114, and the second conductor pattern 134
Profile-free copper foil 35μm
・ Dielectric sheet 130
Product name: Chukoh Chemical Industry Co., Ltd. FGF-400-2
Actual thickness: 40μm
・ Connector 34
SMA-J

(2) Dimensions The dimensions of each part of the first conductor pattern 114 and the second conductor pattern 134 are shown in FIG. As shown in FIG. 7, the widths w1, w2, w3, w4, w5, and w6 of the arm portions 64a, 64b, 158a, 158b, 174a, and 174b are 1.1 mm, 7. 2 mm, 1 mm, 7. 6 mm, 1.5 mm, and 9.8 mm.
The curvature radii R1, R2, and R3 at the center in the width direction of the arc portions 36, 68, 120, 160, 124, and 176 are 28 mm, 56 mm, and 84 mm, respectively.

2. Evaluation (1) Evaluation Method In the phase shifter 102 having the configuration of 1 (1) and (2) above, when a high-frequency input voltage Vin of 2 GHz band (1.8 GHz to 2.2 GHz) is applied to the connector 34a. The output voltages Va to Vh from the connectors 34a to 34h were obtained by simulation (IE3D manufactured by Mentor Graphics).

  Then, as shown in the case of the output voltage Va in the equation (1), the ratio of each of the output voltages Va to Vh with respect to the input voltage Vin is squared to obtain a power ratio and then converted into decibels. This is LogMag as shown in FIG. It was shown in the graph. In addition, Table 1 shows LogMag values at a center frequency of 2025 MHz.

The graph of FIG. 8A shows the LogMag for all the connectors 34a to 34h, and the graph of FIG. 8B expands the vertical axis of FIG. 8A for the connectors 34b to 34h. The LogMag is shown.
In addition, it can be said that LogMag about the connectors 34b-34h represents the attenuation amount of electric power. In addition, it can be said that LogMag for the connector 34a represents the magnitude of the return loss.

(2) Evaluation results (i) As shown in Table 1 and FIG. 8, the output from the connector 34a, that is, the return loss is small over a wide band. Specifically, it is −20 dB or less in the range of 1.8 GHz to 2.2 GHz.

(Ii) As shown in Table 1 and FIG. 8, the outputs from both ends of the same output strip line 28, 116, 118 are different from each other, and the power is distributed well. Specifically, at the center frequency of 2025 MHz, the Log Mag is different by 1 dB between the connector 34c and the connector 34d, 0.9 dB between the connector 34e and the connector 34f, and 1.5 dB between the connector 34g and the connector 34h.

(Iii) As shown in Table 1 and FIG. 8, the LogMag values for the connectors 34b to 34h have little frequency dependency and are excellent in frequency characteristics. Specifically, the amount of change in LogMag of each connector 34b to 34h is 1 dB or less in the range of 1.8 GHz to 2.2 GHz.

  The present invention is not limited to the examples of the first embodiment, the second embodiment, and the second embodiment described above, and the form in which the first and second embodiments are appropriately combined, or these forms. Includes modified forms.

  In the phase shifter 14 of the first embodiment, the outer shape of the closed loop of the second conductor pattern 52 is preferably configured in a substantially sector shape, but may be configured in another shape. That is, the arm portions 64a and 64b extend straight in the radial direction, but may be bent or inclined with respect to the radial direction.

  Further, in the phase shifter 102 of the second embodiment, as a preferred mode, the second conductor pattern 134 is preferably formed by first to third regions 140, 142, and 144 each having a substantially fan-shaped outer shape, that is, three closed loops. However, the outer shapes of the regions 140, 142, and 144 may be different from each other.

  Furthermore, in the first and second embodiments, as a preferable aspect, the angle at which the arc portions 68, 160, 176 of the second conductor patterns 52, 134 intersect with the arm portions 64a, 64b, 158a, 158b, 174a, 174b is However, the arc portions 68, 160, and 176 may protrude from the arm portions 64a, 64b, 158a, 158b, 174a, and 174b in the circumferential direction as long as the return loss is not deteriorated.

  Furthermore, in the second embodiment, the number of output strip lines 28, 116, 118 is three, and the second conductor pattern 134 is configured by three regions 140, 142, 144 corresponding to this. However, the number of output strip lines may be one or more, and the number of regions constituting the second conductor pattern can be set correspondingly.

  On the other hand, in the phase shifters 14 and 102 of the first and second embodiments, the insulating sheets 40 and 130 are disposed between the first conductor patterns 24 and 114 and the second conductor patterns 52 and 134. A dielectric layer may be provided between the conductor patterns 24 and 114 and the second conductor patterns 52 and 134. The dielectric layer may be a layer of air depending on the design.

  In the embodiment, the LogMag of the phase shifter 102 in the 2 GHz band has been described. However, the phase shifter 102 can be applied to other frequency bands such as the 800 MHz band by changing the design as necessary. is there.

  Finally, the power distribution type phase shifter of the present invention is suitable for a radio wave transmission system when used with a phased array antenna, but it is of course applicable to other devices and systems.

10, 100 Radio wave transmission system 14, 102 Power distribution type phase shifter 20, 110 First dielectric substrate 24, 114 First conductor pattern 30 Go part (first go part)
36 Arc part (first arc part)
40, 130 Dielectric sheets 44, 132 Second dielectric substrate 48 Screw (rotating shaft)
52, 134 Second conductor pattern 54 Go part (second go part)
64a Arm part (first arm part)
64b Arm part (second arm part)
68 Arc part (second arc part)
120,124 Arc part (first outer arc part)
158a, 174a Arm part (first outer arm part)
158b, 174b Arm part (second outer arm part)
160,176 Arc part (second outer arc part)

Claims (10)

  1. A first dielectric substrate;
    A second dielectric substrate disposed opposite to the first dielectric substrate and rotatable relative to a rotation axis perpendicular to the first dielectric substrate;
    A first conductor pattern and a second conductor pattern provided on the first dielectric substrate and the second dielectric substrate, respectively, facing each other across a dielectric layer;
    The first conductor pattern includes a first surrounding portion surrounding at least a part of the rotating shaft, and a first arc portion extending in the circumferential direction of the rotating shaft at a position spaced from the first surrounding portion,
    The second conductor pattern surrounds at least a part of the rotating shaft and faces the first surrounding portion, and the second surrounding portion extends in the circumferential direction of the rotating shaft and faces the first arc portion. An arc part, and a first arm part and a second arm part respectively extending between the second surrounding part and the second arc part,
    The first arm portion has a width different from that of the second arm portion.
    A power distribution type phase shifter characterized by that.
  2. The first arm portion and the second arm portion extend away from each other toward the radially outer side,
    The radially outer ends of the first arm part and the second arm part are connected to the second arc part,
    The power distribution type phase shifter according to claim 1.
  3. The radially outer ends of the first arm part and the second arm part are connected to both ends of the second arc part,
    Both ends of the second arc portion are chamfered so that the length of the second arc portion becomes shorter as it goes radially outward.
    The power distribution type phase shifter according to claim 2.
  4. The first conductor pattern further includes one or more first outer arc portions extending in a circumferential direction of the rotating shaft at a position spaced apart from the first arc portion on a radially outer side of the first arc portion,
    The second conductor pattern includes at least one second outer arc portion extending in a circumferential direction of the rotating shaft and facing each of the first outer arc portions, radially outward of the second arc portion, A first outer arm portion and a second outer arm portion, each extending between two arc portions and the second outer arc portion or between the second outer arc portions;
    The first outer arm portion has a width different from that of the second outer arm portion.
    The power distribution type phase shifter according to any one of claims 1 to 3.
  5. The first outer arm portion and the second outer arm portion extend away from each other toward the radially outer side,
    The radially outer ends of the first outer arm part and the second outer arm part are connected to the second outer arc part,
    The power distribution type phase shifter according to claim 4.
  6. The radially outer ends of the first outer arm portion and the second outer arm portion are connected to both ends of the second arc portion,
    Both ends of the second outer arc part are chamfered so that the length of the second outer arc part becomes shorter toward the outer side in the radial direction.
    The power distribution type phase shifter according to claim 5.
  7. The first conductor pattern is:
    An input / output strip line extending linearly via the first surrounding portion;
    The first arc portion and the first outer arc portion are connected to both ends and extend in parallel with the input / output strip line, and output in cooperation with the first arc portion and the first outer arc portion. Including a straight line part constituting a strip line,
    A high-frequency signal input to one end of the input / output strip line is output from the other end of the input / output strip line and one end of each of the linear portions.
    The power distribution type phase shifter according to any one of claims 4 to 6.
  8. In the strip line for output, a portion where the first arc portion or the first outer arc portion and the linear portion are connected is chamfered,
    The power distribution type phase shifter according to claim 7.
  9. A first dielectric substrate;
    A second dielectric substrate disposed opposite to the first dielectric substrate and rotatable relative to a rotation axis perpendicular to the first dielectric substrate;
    A first conductor pattern and a second conductor pattern provided on the first dielectric substrate and the second dielectric substrate, respectively, facing each other across a dielectric layer;
    The first conductor pattern includes a first arc portion extending in a circumferential direction of the rotation shaft at a position spaced from the rotation shaft,
    The second conductor pattern extends in a circumferential direction of the rotation shaft and faces the first arc portion, and a first arm extends between the rotation shaft or the vicinity thereof and the second arc portion. Part and a second arm part,
    The first arm portion has a width different from that of the second arm portion.
    A power distribution type phase shifter characterized by that.
  10. The power distribution type phase shifter according to any one of claims 1 to 9,
    A phased array antenna having a plurality of antenna elements connected to the power distribution type phase shifter;
    A radio wave transmission system comprising:
JP2012021758A 2011-04-06 2012-02-03 Power distribution type phase shifter and radio wave transmission system Active JP5783072B2 (en)

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