JP2008022136A - Transmission line conversion apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transmission line conversion apparatus that is downsized, provides an excellent transmission efficiency, and is easily designed. <P>SOLUTION: A pair of coplanar strip transmission line conductors 3a, 3b and an electromagnetic coupling conductor 4 for the coplanar strip transmission line are provided to a side including a dielectric layer 7 of a first dielectric substrate 1, the shape of the electromagnetic coupling conductor 4 for the coplanar strip transmission line is a half loop that is a loop of a loop shape having an interrupted part, a microstrip line loop conductor 5 is provided to a position on the side opposite to the side including the dielectric layer 7 on a second dielectric substrate 2 and opposed to the electromagnetic coupling conductor 4 for the coplanar strip transmission line, a microstrip line is connected to the microstrip line loop conductor 5, and a ground conductor 6 is provided to a position of the side including the dielectric layer 7 overlapped with the microstrip line of the second dielectric substrate 2 in a three-dimensional vision. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention is suitable for use in communication devices such as microwaves or millimeter waves, and enables conversion from a microstrip transmission line to a coplanar strip transmission line, or from a coplanar strip transmission line conductor to a microstrip transmission line. The present invention relates to a transmission line conversion apparatus.

  When a planar antenna is used for microwave and millimeter wave communications, a coplanar strip transmission line is generally used as a transmission line for feeding a signal to the planar antenna or transmitting a signal received by the planar antenna. ing.

  FIG. 2 shows a transmission line conversion apparatus that enables conversion from a microstrip transmission line used in the past to a slot transmission line, and further enables conversion from this slot transmission line to a coplanar strip transmission line.

  In the example shown in FIG. 2, a first dielectric substrate 1, a second dielectric substrate 2 spaced from the first dielectric substrate 1, a first dielectric substrate 1, and a second dielectric substrate 2. And a dielectric layer 7 provided therebetween.

  A pair of coplanar strip transmission line conductors 3 and a coplanar strip transmission line electromagnetic coupling conductor 4 are provided on the surface of the first dielectric substrate 1 on the dielectric layer 7 side. The shape of the electromagnetic coupling conductor 4 for a coplanar strip transmission line is a half-loop shape having a cutout in a part of the loop-shaped loop.

  The portions of the electromagnetic coupling conductor 4 for the coplanar strip transmission line at both ends of the cut-off portion are respectively connected to both ends of the pair of coplanar strip transmission line conductors 3, and the pair of coplanar strip transmission line conductors 3. Is extended in a direction away from the electromagnetic coupling conductor 4 for the coplanar strip transmission line.

  A ground conductor 6 is provided on the surface of the second dielectric substrate 2 on the side of the dielectric layer 7, and an H-shaped slot 15 is provided in the ground conductor 6. A microstrip line electromagnetic coupling conductor 10 is provided on the surface of the second dielectric substrate 2 opposite to the dielectric layer 7 so as to three-dimensionally intersect the slot 15.

  However, in the example shown in FIG. 2, although the transmission efficiency is excellent, there is a problem that the structure is complicated and it is difficult to design.

  An object of the present invention is to solve the above-mentioned drawbacks of the prior art and to provide a transmission line conversion device that has not been conventionally known.

The present invention is provided between a first dielectric substrate, a second dielectric substrate spaced apart from the first dielectric substrate, and the first dielectric substrate and the second dielectric substrate. A transmission line conversion device comprising a dielectric layer,
A pair of coplanar strip transmission line conductors and a coplanar strip transmission line electromagnetic coupling conductor are provided on the surface of the first dielectric substrate on the dielectric layer side,
The shape of the electromagnetic coupling conductor for the coplanar strip transmission line is a half-loop shape having a cutout in a part of the loop-shaped loop,
The portions of the electromagnetic coupling conductor for the coplanar strip transmission line at or near both ends of the cut-off portion are respectively connected to both ends of the pair of coplanar strip transmission line conductors or near the both ends. The conductor for the coplanar strip transmission line is extended in a direction away from the electromagnetic coupling conductor for the coplanar strip transmission line,
When viewed three-dimensionally, a loop-shaped conductor for microstrip line is provided at a position opposite to the electromagnetic coupling conductor for coplanar strip transmission line on the surface opposite to the dielectric layer of the second dielectric substrate. And
A microstrip line that extends in a direction away from the microstrip line loop conductor is connected to the microstrip line loop conductor.
A transmission characterized in that a ground conductor is provided at a position on the surface of the second dielectric substrate on the side of the dielectric layer that overlaps part or all of the microstrip line in a three-dimensional view. A line conversion device is provided.

Moreover, a transmission line conversion apparatus comprising a dielectric substrate and a dielectric layer laminated on the dielectric substrate,
A pair of coplanar strip transmission line conductors and a coplanar strip transmission line electromagnetic coupling conductor are provided on the surface of the dielectric layer opposite to the dielectric substrate side,
The shape of the electromagnetic coupling conductor for the coplanar strip transmission line is a half-loop shape having a cutout in a part of the loop-shaped loop,
The portions of the electromagnetic coupling conductor for the coplanar strip transmission line at or near both ends of the cut-off portion are respectively connected to both ends of the pair of coplanar strip transmission line conductors or near the both ends. The conductor for the coplanar strip transmission line is extended in a direction away from the electromagnetic coupling conductor for the coplanar strip transmission line,
A loop-shaped conductor for microstrip line is provided at a position opposite to the electromagnetic coupling conductor for coplanar strip transmission line on the surface opposite to the dielectric layer of the dielectric substrate,
A microstrip line that extends in a direction away from the microstrip line loop conductor is connected to the microstrip line loop conductor.
A transmission line conversion, characterized in that a ground conductor is provided at a position on the surface of the dielectric layer that overlaps a part or all of the microstrip line of the dielectric substrate in three dimensions. Providing equipment.

Also, a transmission line conversion device including at least one dielectric substrate,
A pair of coplanar strip transmission line conductors and an electromagnetic coupling conductor for coplanar strip transmission lines are provided on one surface of the dielectric substrate,
The shape of the electromagnetic coupling conductor for the coplanar strip transmission line is a half-loop shape having a cutout in a part of the loop-shaped loop,
The portions of the electromagnetic coupling conductor for the coplanar strip transmission line at or near both ends of the cut-off portion are respectively connected to both ends of the pair of coplanar strip transmission line conductors or near the both ends. The conductor for the coplanar strip transmission line is extended in a direction away from the electromagnetic coupling conductor for the coplanar strip transmission line,
A loop-shaped conductor for microstrip line is provided at a position opposite to the electromagnetic coupling conductor for coplanar strip transmission line on the other surface of the dielectric substrate,
A microstrip line that extends in a direction away from the microstrip line loop conductor is connected to the microstrip line loop conductor.
When viewed three-dimensionally, there is provided a transmission line converter characterized in that a ground conductor is provided at a position overlapping one or all of the microstrip lines on the one surface.

  In the present invention, the electromagnetic coupling conductor for the coplanar strip transmission line has a half-loop shape, the loop-shaped conductor for the microstrip line also has a loop shape, and the ground conductor has a simple configuration. The structure is easy to design because it does not have a complicated shape.

  In the present invention, the above configuration enables transmission line conversion and impedance matching between the microstrip transmission line and the coplanar strip transmission line, and also has an effect that a transmission line conversion device can be manufactured at a low cost with a simple structure. Is recognized.

  The transmission line converter of the present invention is built in or attached to a display device such as a notebook personal computer, a plasma display device, a PDA (Personal Digital Assistants), and a portable game machine for home use. The power supply to the planar antenna provided in the apparatus can be facilitated, and the high-frequency antenna apparatus can be produced efficiently. In particular, it is possible to manufacture a high-frequency antenna device suitable for wireless communication Bluetooth for portable information devices, short-range wireless communication ZigBee system for home appliances, and the like.

  Furthermore, by using the transmission line conversion device of the present invention as a transmission line for a flat antenna provided on a front window glass plate or a rear window glass plate of an automobile, a high-frequency antenna device can be efficiently produced. In particular, SDARS (Satellite Digital Audio Radio Service (around 2.6 GHz)), GPS (Global Positioning System), VICS (Vehicle Information and Communication System), ETC (Electronic Toll Collection System), DSRC (Dedicated Short Range Communication) system, etc. A high-frequency antenna device suitable for the above can be manufactured.

  Hereinafter, a transmission line converter of the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings. FIG. 1 is a schematic diagram showing a first embodiment of a transmission line converter of the present invention.

  In FIG. 1, 1 is a first dielectric substrate, 2 is a second dielectric substrate, 3 is a pair of coplanar strip transmission lines, 3a is a first coplanar strip transmission line conductor, and 3b is a second coplanar strip. A transmission line conductor, 3c is a groove for a coplanar strip transmission line provided between a pair of coplanar strip transmission line conductors 3a, 3b, 4 is an electromagnetic coupling conductor for a coplanar strip transmission line, and 4a, 4b are cut portions 4c. The portions of the electromagnetic coupling conductor 4 for the coplanar strip transmission line at or near both ends.

  Reference numeral 5 denotes a loop conductor for the microstrip line, 6 denotes a ground conductor, 7 denotes a dielectric layer, and 10 denotes an electromagnetic coupling conductor for the microstrip line. In the first embodiment, stacking is performed so that all the components shown in FIG. 1 are sequentially stacked in the direction of the arrow.

  In the first embodiment, a first dielectric substrate 1, a second dielectric substrate 2 spaced apart from the first dielectric substrate 1, a first dielectric substrate 1, and a second dielectric substrate 2. And a dielectric layer 7 provided therebetween. A pair of coplanar strip transmission line conductors 3a and 3b and a coplanar strip transmission line electromagnetic coupling conductor 4 are provided on the surface of the first dielectric substrate 1 on the dielectric layer 7 side.

  When viewed three-dimensionally, a loop-shaped conductor for microstrip line is located at a position opposite to the electromagnetic coupling conductor 4 for coplanar strip transmission line on the surface opposite to the dielectric layer 7 of the second dielectric substrate 2. 5 is provided.

  In the first embodiment, the ground conductor 6 is provided at the position of the surface of the second dielectric substrate 2 on the side of the dielectric 7 layer that overlaps with the entire microstrip line 10 in three dimensions. Yes. By doing so, transmission efficiency is improved. However, the present invention is not limited to this, and the ground conductor 6 may be provided at a position on the surface on the dielectric layer 7 side that overlaps a part of the microstrip line 10 in three dimensions.

  In the first embodiment, a dielectric layer 7 is provided between the first dielectric substrate 1 and the second dielectric substrate 2. However, the present invention is not limited to this, and a dielectric substrate different from the first dielectric substrate 1 and the second dielectric substrate 2 may be used instead of the dielectric layer 7.

In the first embodiment, when the wavelength of the transmission signal in the first dielectric substrate 1 is λ _g1c , the cut-off portion 4c that is the origin of the half-loop shape of the electromagnetic coupling conductor 4 for the coplanar strip transmission line. In order to improve transmission efficiency, it is preferable that the length of the inner peripheral edge of the loop shape in which is not provided is 0.8λ _{g1c to} 1.2λ _g1c . More preferred range is _0.9λ g1c ~1.1λ g1c, particularly preferred range is _0.95λ g1c ~1.05λ g1c.

When the wavelength of the transmission signal in the second dielectric substrate 2 is λ _g2m , the length of the inner peripheral edge of the microstrip line loop conductor is 0.8λ _{g2m to} 1.2λ _g2m. Is preferable in order to improve transmission efficiency. More preferred range is _0.9λ g2m ~1.1λ g2m, particularly preferred range is _0.95λ g2m ~1.05λ g2m.

The thickness of the first dielectric substrate 1 is not particularly limited because it is not directly related to electromagnetic coupling. For example, when a glass plate for a notebook personal computer is used as the first dielectric substrate 1, the thickness is 0.6 to 0.7 mm and the relative dielectric constant (ε ₁ ) is 5.0 to 7. It is preferable to use a zero glass plate. Further, for example, when an automobile window glass plate is used as the first dielectric substrate 1, the thickness is 2.0 to 6.0 mm and the relative dielectric constant (ε ₁ ) It is preferable to use a glass plate of 5.0 to 9.0.

  When a window glass plate of an automobile is used as the first dielectric substrate 1, it is preferable that the peripheral edge of the ground conductor 12 be separated from the opening of the vehicle body (not shown) by 1 mm or more. However, the present invention is not limited to this, and the ground conductor 12 can be used even when the periphery of the ground conductor 12 is connected to the opening edge of the vehicle body of the window. Here, the vehicle body opening edge of the window refers to a peripheral edge of the cut-off portion of the vehicle body into which the window glass plate is fitted, and should be a vehicle body ground, and is made of, for example, a conductive material such as metal.

  In the first embodiment, the coplanar strip transmission line electromagnetic coupling conductor 4 and the pair of coplanar strip transmission line conductors 3a and 3b are provided on the surface of the dielectric layer 7 opposite to the second dielectric substrate 2. This is the second embodiment. In the second embodiment, the first dielectric substrate 1 may or may not be present.

In the second embodiment, when the wavelength of the transmission signal in the dielectric layer 7 is _λg3c , there is provided a cut-off portion 4c that is the origin of the half-loop shape of the electromagnetic coupling conductor 4 for the coplanar strip transmission line. The length of the inner periphery of the loop shape that is not long is preferably _0.8λ g3c to _{1.2λ g3c} in order to improve transmission efficiency. More preferred range is _0.9λ g3c ~1.1λ g3c, particularly preferred range is _0.95λ g3c ~1.05λ g3c.

Also, the transmission signal, when the wavelength of the second dielectric in substrate 2 and lambda _G2M, the length of the inner periphery of the loop-shaped conductor 5 for a microstrip line, is 0.8λ _g2m ~1.2λ _g2m Is preferable in order to improve transmission efficiency. More preferred range is _0.9λ g2m ~1.1λ g2m, particularly preferred range is _0.95λ g2m ~1.05λ g2m.

  The common items of the first and second embodiments will be described.

  The dielectric layer 7 is preferably interposed between the first dielectric substrate 1 and the second dielectric substrate 2 and has an insulating property. As the dielectric layer 7, a dielectric composition or ceramics including an insulating adhesive, a synthetic resin such as a filler, or the like is usually used, and a gas layer can also be used. However, the present invention is not limited to this, and any dielectric material can be used, and a dielectric substrate can also be used.

  Examples of the adhesive having insulating properties include an adhesive containing an epoxy resin and the like, and those having a relative dielectric constant in the range of 1.0 to 4.0 are preferable because they can be obtained easily and inexpensively. Moreover, as a filler, the filler which has insulation and contains silicone is mentioned, for example.

  When a gas layer is used as the dielectric layer 7, an air layer that is usually inexpensive in cost is used. However, the dielectric layer 7 is not limited to this and may be an inert gas such as nitrogen or argon. Further, the gas layer is preferably sufficiently dried so that moisture contained in the gas does not condense depending on the temperature.

The dimensions and area of the dielectric layer 7 are preferably the same as those of the second dielectric substrate 2. The thickness of the dielectric layer 7 is preferably 0.1 to 1.6 mm in order to improve transmission efficiency. The relative dielectric constant (ε ₃ ) of the dielectric layer 7 is preferably 1.0 to 3.0 in order to improve transmission efficiency.

  FIG. 3 is a schematic view showing a third embodiment of the transmission line converter of the present invention. In the example shown in FIG. 3, the dielectric layer 7 in FIG. 1 is not provided, and instead, the surface of the dielectric substrate 2 in FIG. 1 on which the microstrip line loop-like conductor 5 is provided. Are provided with a grounding conductor 6, a coplanar strip transmission line electromagnetic coupling conductor 4 and a pair of coplanar strip transmission line conductors 3 on the opposite surface.

In the third embodiment, the length of the inner peripheral edge of the loop shape that is not provided with the cut-off portion 4c and becomes the basis of the half-loop shape of the electromagnetic coupling conductor 4 for the coplanar strip transmission line is 0.8λ _{g2m −1.} .2λ _g2m is preferable in order to improve transmission efficiency. More preferred range is _0.9λ g2m ~1.1λ g2m, particularly preferred range is _0.95λ g2m ~1.05λ g2m.

In addition, the length of the inner peripheral edge of the microstrip line loop-shaped conductor 5 is preferably _0.8λ g2m to _{1.2λ g2m} in order to improve transmission efficiency. More preferred range is _0.9λ g2m ~1.1λ g2m, particularly preferred range is _0.95λ g2m ~1.05λ g2m.

The lambda ₀ the wavelength in a free space of the transmission signal, when the dielectric shortening coefficient of wavelength in the dielectric substrate 2 and k _2, is _{λ g2m = λ 0 · k 2} . Incidentally, k ₂ is preferably to apply the values in Table 1 below in approximately.

  In the third embodiment, the microstrip line loop-shaped conductor 5 and the ground conductor 6 are provided on the same surface, and can be used even if the microstrip line loop-shaped conductor 5 and the ground conductor 6 are connected. . In FIG. 3, when a conductor layer is provided in a region 6 a surrounded by a broken line, the microstrip line loop conductor 5 and the ground conductor 6 are connected.

The common items of the first to third embodiments will be described.
The shape of the electromagnetic coupling conductor 4 for a coplanar strip transmission line is a half-loop shape having a cut-off portion 4c. Here, in the present invention, the half-loop shape means a shape that has a cut-off portion in a part of the loop-shaped loop and is not a complete loop.

  The portions of the electromagnetic coupling conductor for the coplanar strip transmission line at or near both ends of the cut-off portion 4c are respectively connected to both ends of the pair of coplanar strip transmission line conductors 3a and 3b or near the both ends. .

  There is no particular limitation on the loop shape on which the cut-off portion 4c is not provided, which is the basis of the half-loop shape of the electromagnetic coupling conductor 4 for the coplanar strip transmission line. However, in order to improve transmission efficiency, a circle, a substantially circular shape, an ellipse, or a substantially elliptical shape is preferable. The electromagnetic coupling conductor 4 for the coplanar strip transmission line is a line conductor or a strip conductor.

  The loop shape of the microstrip line loop-shaped conductor 5 is not particularly limited. However, in order to improve transmission efficiency, a circle, a substantially circular shape, an ellipse, or a substantially elliptical shape is preferable. The microstrip line loop conductor 5 is a wire conductor or a strip conductor. A microstrip line 10 extending in a direction away from the microstrip line loop conductor 5 is connected to the microstrip line loop conductor 5.

  From the three-dimensional viewpoint, it is preferable that the center or center of gravity of the half-loop shape and the center or center of gravity of the microstrip line loop-shaped conductor 5 are coincident or substantially coincide with each other in order to improve transmission efficiency.

  When viewed three-dimensionally, the transmission efficiency is improved when the entire loop-shaped conductor 5 for the microstrip line overlaps with the shape of the electromagnetic coupling conductor 4 for the coplanar strip transmission line, where the cut-off portion 4c is not provided. Therefore, it is preferable. However, the present invention is not limited to this, and can be used if a part of the microstrip line loop-like conductor 5 overlaps with the shape of the electromagnetic coupling conductor 4 for the coplanar strip transmission line, which is not provided with the cut-off portion 4c. .

When the conductor width of the electromagnetic coupling conductor 4 for the coplanar strip transmission line is W _c2 and the conductor width of the loop-like conductor 5 for the microstrip line is W _M2 , W _c2 ≧ 1.1 W _M2 is preferable because transmission efficiency is improved. . A more preferred range is W _c2 ≧ 2.5 W _M2 , and a particularly preferred range is W _c2 ≧ 4.0 W _M2 .

  From a three-dimensional viewpoint, it is preferable that the pair of coplanar strip transmission lines and the microstrip line 10 are perpendicular or substantially perpendicular to improve transmission efficiency.

  When viewed three-dimensionally, it is preferable that the ground conductor 6 is not provided in the region where the electromagnetic coupling conductor 4 for the coplanar strip transmission line is provided in order to improve transmission efficiency.

  The present invention is preferably used in a frequency range of 0.5 to 50 GHz, particularly 2 to 6 GHz.

  The present invention will be described below with reference to examples, but the present invention is not limited to these examples, and various improvements and modifications are also included in the present invention as long as the gist of the present invention is not impaired. Hereinafter, embodiments will be described in detail with reference to the drawings.

  FIG. 4 is a plan view showing dimensions of the coplanar strip transmission line electromagnetic coupling conductor 4 and the coplanar strip transmission line conductors 3a and 3b in the embodiment. FIG. 5 is a plan view showing dimensions of the microstrip line 10 and the microstrip line loop conductor 5 in the embodiment.

  Assuming the second embodiment, the transmission characteristics from the pair of coplanar strip transmission line conductors 3 to the microstrip line electromagnetic coupling conductors 10 were calculated by the FDTD method (Finite Difference Time Domain method). The operating frequency was 5.0 GHz. Without providing the first dielectric substrate 1, the dielectric layer 7 was a dielectric substrate.

  Various numerical values are shown below, and FIG. 6 shows gain-frequency characteristics (solid line) and reflection loss-frequency characteristics (broken line). FIG. 7 shows the insertion loss-frequency characteristics. FIG. 8 shows the conductor width of the electromagnetic coupling conductor 4 for insertion loss-coplanar strip transmission line.

Dielectric substrate 2 20.0 × 20.0 × 0.2 mm,
Dielectric layer 7 (dielectric substrate) 20.0 × 20.0 × 0.2 mm,
Dielectric constant of dielectric substrate 2 4.7,
Dielectric constant of dielectric layer 7 (dielectric substrate) 4.7,
W _c1 0.35 mm,
W _c2 2.0 mm,
D _c 10.39 mm,
G _c 0.35 mm.

W _M1 0.35mm,
W _M2 0.35mm,
D _M 10.39mm
L _M 4.65mm,
The width of the ground conductor 6 (perpendicular to the microstrip line 10) 8.0 mm,
The length of the ground conductor 6 (parallel to the microstrip line 10) 5.0 mm.

  INDUSTRIAL APPLICABILITY The present invention is used as a transmission line converter such as a radio communication Bluetooth for portable information devices and a high-frequency antenna device suitable for a short-range radio communication ZigBee system for home appliances. Furthermore, it is used as a transmission line conversion device such as a high-frequency antenna device suitable for SDARS, GPS, satellite digital broadcasting, VICS, ETC, and DSRC systems.

The schematic diagram which shows 1st Embodiment of the transmission line converter of this invention. The schematic diagram which shows the transmission line converter using the conventional electromagnetic coupling conductor for coplanar strip transmission lines. The schematic diagram which shows 3rd Embodiment of the transmission line converter of this invention. The top view which shows the dimension of the electromagnetic coupling conductor 4 for coplanar strip transmission lines. The top view which shows the dimension of the loop-shaped conductor 5 for microstrip lines. The gain-frequency characteristic (solid line) and reflection loss-frequency characteristic (broken line) figure of an Example. The insertion loss-frequency characteristic figure of an Example. The characteristic figure of the conductor width of the electromagnetic coupling conductor 4 for insertion loss-coplanar strip transmission lines of an Example.

Explanation of symbols

1: first dielectric substrate 2: second dielectric substrate 3: pair of coplanar strip transmission line conductors 3a: first coplanar strip transmission line conductor 3b: second coplanar strip transmission line conductor 3c: Coplanar strip transmission line groove portion 4: Coplanar strip transmission line electromagnetic coupling conductors 4b and 4c: Coplanar strip transmission line electromagnetic coupling conductor portions 5 at or near both ends of the cut-off portion 4a: Microstrip line loop conductor 6: Ground conductor 7: Dielectric layer 10: Electromagnetic coupling conductor for microstrip line

Claims (15)

A first dielectric substrate; a second dielectric substrate spaced apart from the first dielectric substrate; and a dielectric layer provided between the first dielectric substrate and the second dielectric substrate; A transmission line conversion device comprising:
A pair of coplanar strip transmission line conductors and a coplanar strip transmission line electromagnetic coupling conductor are provided on the surface of the first dielectric substrate on the dielectric layer side,
The shape of the electromagnetic coupling conductor for the coplanar strip transmission line is a half-loop shape having a cutout in a part of the loop-shaped loop,
The portions of the electromagnetic coupling conductor for the coplanar strip transmission line at or near both ends of the cut-off portion are respectively connected to both ends of the pair of coplanar strip transmission line conductors or near the both ends. The conductor for the coplanar strip transmission line is extended in a direction away from the electromagnetic coupling conductor for the coplanar strip transmission line,
When viewed three-dimensionally, a loop-shaped conductor for microstrip line is provided at a position opposite to the electromagnetic coupling conductor for coplanar strip transmission line on the surface opposite to the dielectric layer of the second dielectric substrate. And
A microstrip line that extends in a direction away from the microstrip line loop conductor is connected to the microstrip line loop conductor.
A transmission characterized in that a ground conductor is provided at a position on the surface of the second dielectric substrate on the side of the dielectric layer that overlaps part or all of the microstrip line in a three-dimensional view. Line conversion device.   The transmission line converter according to claim 1, wherein the dielectric layer is a dielectric substrate different from the first dielectric substrate and the second dielectric substrate. When the wavelength of the transmission signal in the first dielectric substrate is λ _g1c ,
The length of the inner peripheral edge of the loop shape without the cut-off portion, which is the basis of the half loop shape of the electromagnetic coupling conductor for the coplanar strip transmission line, is 0.8λ _{g1c to} 1.2λ _g1c ,
When the wavelength of the transmission signal in the second dielectric substrate is λ _g2m ,
The length of the inner peripheral edge of the loop-shaped conductor microstrip line, the transmission line converter according to claim 1 or 2 which is _0.8λ g2m ~1.2λ g2m. A transmission line converter comprising a dielectric substrate and a dielectric layer laminated on the dielectric substrate,
A pair of coplanar strip transmission line conductors and a coplanar strip transmission line electromagnetic coupling conductor are provided on the surface of the dielectric layer opposite to the dielectric substrate side,
The shape of the electromagnetic coupling conductor for the coplanar strip transmission line is a half-loop shape having a cutout in a part of the loop-shaped loop,
The portions of the electromagnetic coupling conductor for the coplanar strip transmission line at or near both ends of the cut-off portion are respectively connected to both ends of the pair of coplanar strip transmission line conductors or near the both ends. The conductor for the coplanar strip transmission line is extended in a direction away from the electromagnetic coupling conductor for the coplanar strip transmission line,
A loop-shaped conductor for microstrip line is provided at a position opposite to the electromagnetic coupling conductor for coplanar strip transmission line on the surface opposite to the dielectric layer of the dielectric substrate,
A microstrip line that extends in a direction away from the microstrip line loop conductor is connected to the microstrip line loop conductor.
A transmission line conversion, characterized in that a ground conductor is provided at a position on the surface of the dielectric layer that overlaps a part or all of the microstrip line of the dielectric substrate in three dimensions. apparatus.   The transmission line converter according to claim 4, wherein the dielectric layer is a dielectric substrate different from the dielectric substrate. When the wavelength of the transmission signal in the dielectric layer is λ _g3c ,
The length of the inner periphery of the loop shape without the cut-off portion, which is the basis of the half-loop shape of the electromagnetic coupling conductor for the coplanar strip transmission line, is 0.8λ _{g3c to} 1.2λ _g3c ,
When the wavelength of the transmission signal in the second dielectric substrate is λ _g2m ,
The transmission line converter according to claim 4 or 5, wherein a length of an inner peripheral edge of the loop-shaped conductor for microstrip line is 0.8λ _{g2m to} 1.2λ _g2m . A transmission line converter comprising at least one dielectric substrate,
A pair of coplanar strip transmission line conductors and an electromagnetic coupling conductor for coplanar strip transmission lines are provided on one surface of the dielectric substrate,
The shape of the electromagnetic coupling conductor for the coplanar strip transmission line is a half-loop shape having a cutout in a part of the loop-shaped loop,
The portions of the electromagnetic coupling conductor for the coplanar strip transmission line at or near both ends of the cut-off portion are respectively connected to both ends of the pair of coplanar strip transmission line conductors or near the both ends. The conductor for the coplanar strip transmission line is extended in a direction away from the electromagnetic coupling conductor for the coplanar strip transmission line,
A loop-shaped conductor for microstrip line is provided at a position opposite to the electromagnetic coupling conductor for coplanar strip transmission line on the other surface of the dielectric substrate,
A microstrip line that extends in a direction away from the microstrip line loop conductor is connected to the microstrip line loop conductor.
A transmission line conversion apparatus characterized in that a ground conductor is provided at a position overlapping the part or all of the microstrip line on the one surface when viewed three-dimensionally. When the wavelength of the transmission signal in the dielectric substrate is λ _{g2 m} ,
The length of the inner periphery of the loop shape without the cut-off portion, which is the basis of the half-loop shape of the electromagnetic coupling conductor for the coplanar strip transmission line, is 0.8λ _{g2m to} 1.2λ _g2m ,
The transmission line converter according to claim 7, wherein a length of an inner peripheral edge of the loop-shaped conductor for the microstrip line is 0.8λ _{g2m to} 1.2λ _g2m . The loop shape that is not provided with the cut-off portion, which is the basis of the half-loop shape of the electromagnetic coupling conductor for the coplanar strip transmission line, is a circle, a substantially circle, an ellipse, or a substantially ellipse.
The transmission line converter according to any one of claims 1 to 8, wherein the microstrip line loop-shaped conductor has a circular shape, a substantially circular shape, an elliptical shape, or a substantially elliptical shape.   The transmission line conversion according to any one of claims 1 to 9, wherein when viewed three-dimensionally, the center or center of gravity of the half-loop shape and the center or center of gravity of the loop conductor for the microstrip line are coincident or substantially coincident with each other. apparatus.   The transmission line converter according to any one of claims 1 to 10, wherein the pair of coplanar strip transmission lines and the microstrip line are perpendicular or substantially perpendicular when viewed three-dimensionally. 12. When the conductor width of the electromagnetic coupling conductor for the coplanar strip transmission line is W _c2 and the conductor width of the loop conductor for the microstrip line is W _M2 , W _c2 ≧ 1.1 W _M2 A transmission line converter according to claim 1.   The three-dimensional microstrip line loop-shaped conductor partially or entirely overlaps with the shape without the cut-off portion, which is the origin of the coplanar strip transmission line electromagnetic coupling conductor when viewed three-dimensionally. The transmission line converter according to any one of 12. The first dielectric substrate has a thickness of 0.1 to 5.0 mm, the first dielectric substrate has a relative dielectric constant of 1.0 to 8.0,
The thickness of the second dielectric substrate is 0.1 to 2.0 mm, the relative dielectric constant of the second dielectric substrate is 1.0 to 8.0,
The transmission line according to any one of claims 1 to 3, wherein a thickness of the dielectric layer is 0.1 to 2.0 mm, and a relative dielectric constant of the dielectric layer is 1.0 to 8.0. Conversion device. The transmission line converter according to any one of claims 1 to 14, wherein the operating frequency is one within 0.5 to 50 GHz.

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