JP3965762B2 - Triplate line interlayer connector - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an interlayer connection structure of a triplate line in the millimeter wave band.
[0002]
[Prior art]
As shown in FIG. 6, the conventional interlayer connection structure of the triplate line has a first dielectric 4a and a second dielectric 4b in the middle of the first ground conductor 1 and the second ground conductor 2, respectively. A third dielectric is provided approximately in the middle of the first triplate line having the first power supply substrate 6 forming the sandwiched first power supply line 5 and the second ground conductor 2 and the third ground conductor 3. A second triplate line having a second power supply substrate 9 formed with a second power supply line 8 sandwiched between a body 7a and a fourth dielectric 7b is formed on the second ground conductor 2. The second slot 14 is electromagnetically coupled.
[0003]
Usually, the first dielectric 4a, the second dielectric 4b, the third dielectric 7a, and the fourth dielectric 7b have a low relative dielectric constant ε ₁ ≈1 in order to suppress the loss of the feed line. A dielectric material is used.
In addition, the distance between the first ground conductor 1 and the second ground conductor 2 and the distance between the second ground conductor 2 and the third ground conductor 3 indicate that a higher-order mode is generated in the line at the frequency used. In order to avoid this, it is set to be approximately one fifth or less of the line effective wavelength (line effective wavelength = free space wavelength / square root of the dielectric constant of the dielectric) of the frequency used.
[0004]
Further, in order to satisfactorily electromagnetically couple the first feed line 5 and the second feed line 8 through the second slot 14, it is necessary to resonate at the frequency at which the second slot 14 is used. Therefore, as shown in FIG. 7, the resonator length L8 of the second slot 14 is set to approximately one half of the line effective wavelength of the frequency used, and the connection termination portion of the first feed line 5; It is necessary to arrange the second slot 14 so as to be located at the position of the line length L7 that is approximately a quarter of the effective line wavelength of the frequency to be used from the connection termination portion of the second feed line 8. .
Further, the width of the second slot 14 is set to about one tenth of the effective line wavelength of the frequency to be used.
[0005]
In this way, by setting the resonator length L8 of the second slot 14 to approximately one half of the line effective wavelength of the frequency using the second slot 14, the second slot 14 resonates at the frequency used, and By setting the setting position L7 of the second slot 14 from the connection termination portion of the first feed line 5 and the second feed line 8 to approximately one quarter of the line effective wavelength of the frequency to be used, the feed line Thus, impedance matching is ensured in anticipation of the second slot 14, and power is transmitted without reflection.
[0006]
[Problems to be solved by the invention]
However, in the conventional interlayer connection structure of the triplate line shown in FIG. 6, the frequency change with respect to the error of the resonator length L8 of the second slot 14 is large, and the first feed line 5 and the second feed line 5 There is a problem that the frequency characteristic becomes a narrow band because a change in impedance in which the second slot 14 is expected from the feed line with respect to the error of the setting position L7 of the second slot 14 from the connection termination portion of the feed line 8 is large. there were.
[0007]
Further, with the electromagnetic coupling between the first feed line 5 and the second feed line 8 and the second slot 14, between the first ground conductor 1 and the second ground conductor 2 and the third ground conductor 3. There is a problem that a parallel plate component propagating in the lateral direction occurs between the first ground conductor 2 and the second ground conductor 2 to increase loss.
[0008]
Further, when the conventional triplate line interlayer connection structure is to be realized in a very high frequency band, for example, a frequency to be used is 76.5 GHz band, the resonator length of the second slot 14 shown in FIG. Since L8 is about 2 mm and the width is extremely small, about 0.4 mm or less, the second slot 14 is difficult to form by mechanical press work or the like, and the first slot is It is necessary to set the setting position L7 of the second slot 14 from the connection end portion of the feed line 5 and the second feed line 8 with high accuracy to about 1 mm. There was a problem that selection was indispensable and cost was high.
[0009]
It is an object of the present invention to provide a triplate line interlayer connector that is excellent in loss suppression and that can be easily assembled.
[0010]
[Means for Solving the Problems]
As shown in FIG. 1, the triplate line interlayer connector of the present invention is connected to the first dielectric 4 a and the second dielectric 4 b approximately in the middle between the first ground conductor 1 and the second ground conductor 2. The third triplate line between which the first power supply substrate 6 forming the first power supply line 5 is sandwiched and the second ground conductor 2 and the third ground conductor 3 are arranged in the middle. An electrical connector with a second triplate line on which a second feed substrate 9 having a second feed line 8 formed is sandwiched between a dielectric 7a and a fourth dielectric 7b. The first patch pattern 12a and the second patch terminal 12 are connected to the connection terminal portion of the first power supply line 5 of the first power supply substrate 6 and the connection terminal portion of the second power supply line 8 of the second power supply substrate 9, respectively. A patch pattern 12b is formed, and a first dielectric 4a and a second dielectric 4 around the first patch pattern 12a are formed. And the first shield spacer 10a and the second shield spacer 10b having a hollow portion larger than the shape of the first patch pattern 12a and the first feed line 5 connected to the first patch pattern 12a. And the third dielectric 7a and the fourth dielectric 7b at the periphery of the second patch pattern 12b are deleted, and the second patch pattern 12b and the second patch pattern connected to the second patch pattern 12b are removed at the deleted location. A third shield spacer 11a and a fourth shield spacer 11b having a hollow portion larger than the shape of the feed line 8 are provided, and further positioned between the first patch pattern 12a and the second patch pattern 12b. A first slot 13 is formed in a portion of the second ground conductor 2.
[0011]
Further, as shown in FIG. 2, the triplate line interlayer connector of the present invention has a free space wavelength of a frequency using the length L1 in the line connection direction of the first patch pattern 12a and the second patch pattern 12b. 0.38 times abbreviation of lambda _0, and the first shield spacer 10a, the second shield spacer 10b, the third shield spacer 11a, and the line connecting direction of the patch perimeter of cutouts of the fourth shield spacer 11b And the dimension L3 in the line connection direction of the first slot 13 can be approximately 0.6 times the free space wavelength λ ₀ of the frequency used.
[0012]
Further, as shown in FIG. 3, the triplate line interlayer connector of the present invention has a circular shape of the first patch pattern 12a and the second patch pattern 12b, and its diameter L4 is a free space of a frequency to be used. 0.38 times substantially wavelength lambda _0, and the first shield spacer 10a, the second shield spacer 10b, the third shield spacer 11a, and the hollow portion shape of the patch periphery of the fourth shield spacer 11b a circular and substantially 0.6 times the free space wavelength lambda ₀ of the frequency of using the diameter L5, and the free space wavelength lambda ₀ of the frequencies of the shape of the first slot 13 is circular uses its diameter L6 substantially It can also be 0.6 times.
[0013]
(Function)
In the triplate line interlayer connector of the present invention, the first patch pattern 12a and the second patch pattern 12b shown in FIG. 1 are electromagnetically coupled to each other at a frequency to be used to constitute one resonator. The first patch pattern 12a and the second patch pattern 12b can ensure characteristics with a very wide band as compared with the resonator having the conventional structure.
[0014]
The first slot 13 functions as a window through which power is transmitted from the first feed line 5 to the second feed line 8 without interfering with the electromagnetic coupling between the patches. Therefore, the frequency change with respect to the length error of the resonator length L3 in the line connection direction of the first slot 13 is small, and coupled with the broadband characteristics of the resonator by the patch pattern, A stable triplate line interlayer connector can be constructed.
[0015]
The first shield spacer 10a, the second shield spacer 10b, the third shield spacer 11a, and the fourth shield spacer 11b are spaced around the first patch pattern 12a and the second patch pattern 12b. A metal wall is formed, and all the electric power of the first patch pattern 12a is transmitted to the second patch pattern 12b without generating a parallel plate component, so that a low loss characteristic can be realized.
[0016]
The first shield spacer 10a, the second shield spacer 10b, the third shield spacer 11a, and the fourth shield spacer 11b are connected to the first power supply substrate 6 and the second power supply substrate 9, respectively. The first and second patch patterns 12a and 12a function as a spacer that is stably held substantially in the middle between the second ground conductor 2 and the second ground conductor 2 and the second ground conductor 2 and the third ground conductor 3. By maintaining the distance between 12b stably, the electromagnetic coupling between patches can always be kept stable.
[0017]
The shapes of the first patch pattern 12a, the second patch pattern 12b, and the first slot 13 are generally square as shown in FIG. 2, but the dimension in the width direction has an effect on the resonance frequency. Since it is small, it may be rectangular as necessary, and even if it is circular as shown in FIG.
Further, for example, the connection portion between the first patch pattern 12a and the first feed line 5 is arranged in order to match the impedance of the end of the first patch pattern 12a with the impedance of the first feed line 5 as shown in FIG. As shown in a), it is common to connect with a transformer line 101 having a line length of about one-fourth of the effective line wavelength of the frequency used, but as shown in FIG. The power supply can be directly matched at the matching point 102 or capacitively coupled through a slight gap 103 as shown in FIG.
[0018]
【Example】
Example 1
As the first ground conductor 1 and the third ground conductor 3, an aluminum plate having a thickness of 1 mm is used, and the first dielectric 4a, the second dielectric 4b, the third dielectric 7a, and the fourth dielectric For the dielectric 7b, a foamed polyethylene foam having a thickness of 0.3 mm and a relative dielectric constant of about 1.1 is used. For the first power supply substrate 6, a flexible substrate in which a copper foil is bonded to a polyimide film is used. The copper foil is removed by etching, and the first power supply line 5 and the first patch pattern 12a are formed. The second power supply substrate 9 is also made of copper on a polyimide film, which is the same as the first power supply substrate. Using a flexible substrate bonded with foil, removing unnecessary copper foil by etching and forming the second feed line 8 and the second patch pattern 12b, the second ground conductor 2 is A mechanical press presses the first screw on a 0.7 mm thick aluminum plate. The first shield spacer 10a, the second shield spacer 10b, the third shield spacer 11a, and the fourth shield spacer 11b are made of an aluminum plate having a thickness of 0.3 mm. This was punched with a mechanical press.
In the first patch pattern 12a and the second patch pattern 12b, L1 shown in FIG. 2B is approximately 0.38 times the free space wavelength (λ ₀ = 3.95 mm) of the frequency 76 GHz used. The shape was 1.5 mm and the shape was a square.
The dimension L3 of the first slot 13 is 2.3 mm, which is about 0.58 times the free space wavelength (λ ₀ = 3.95 mm) of the frequency 76 GHz to be used, and the shape is square.
The dimension L2 of the first shield spacer 10a, the second shield spacer 10b, the third shield spacer 11a, and the fourth shield spacer 11b is the same as the dimension L3 of the first slot 13.
Further, a transformer line 101 having a length about 0.24 times the free space wavelength (λ ₀ = 3.95 mm) of the frequency 76 GHz to be used is connected to the connection portion between the first feed line 5 and the first patch pattern 12a. And the same transformer line 101 was formed at the connecting portion between the second feed line 8 and the second patch pattern 12b and matched.
As shown in FIG. 2A, the above-described members are sequentially stacked to constitute a triplate line interlayer connector, and a measuring instrument is connected to the first feed line 5 and the second feed line 8 to supply power. FIG. 5 shows the result of measuring the reflection loss at the end of the first feed line 5 and the passage loss when power passes from the first feed line 5 to the end face of the second feed line 8 while feeding power. Thus, good characteristics such as a reflection loss of -15 dB or less and a pass loss of 1 dB or less in a range of ± 2 GHz centering on 76 GHz can be realized.
[0019]
Example 2
As in the first embodiment, the first ground conductor 1 and the third ground conductor 3 are made of an aluminum plate having a thickness of 1 mm, and the first dielectric 4a, the second dielectric 4b, and the third dielectric are used. Foamed polyethylene foam having a thickness of 0.3 mm and a relative dielectric constant of about 1.1 is used for the body 7a and the fourth dielectric 7b, and a copper foil is bonded to a polyimide film for the first power supply substrate 6. The first power supply board is also used for the second power supply board using a flexible board that is formed by removing unnecessary copper foil by etching and forming the first power supply line 5 and the first patch pattern 12a. In the same manner as described above, a flexible substrate in which a copper foil is bonded to a polyimide film is used, and unnecessary copper foil is removed by etching to form a second feed line 8 and a second patch pattern 12b. 2 ground conductor 2 is made of 0.7 mm thick aluminum plate. The first slot 13 is punched with a mechanical press, and the first shield spacer 10a, the second shield spacer 10b, the third shield spacer 11a, and the fourth shield spacer 11b have a thickness of 0. A 3 mm aluminum plate punched with a mechanical press was used.
In the first patch pattern 12a and the second patch pattern 12b, the diameter L4 shown in FIG. 3B is approximately 0.38 times the free space wavelength (λ ₀ = 3.95 mm) of the frequency 76 GHz used. 1.5 mm and the shape was circular.
The slot dimension L6 is 2.3 mm in diameter, which is about 0.58 times the free space wavelength (λ ₀ = 3.95 mm) of the frequency 76 GHz used, the shape is circular, the first shield spacer 10a, The dimension L5 of the second shield spacer 10b, the third shield spacer 11a, and the fourth shield spacer 11b is the same as the slot dimension, and the shape is circular.
Further, a transformer line 101 having a length of about 0.24 times the free space wavelength (λ ₀ = 3.95 mm) of the frequency 76 GHz to be used is connected to the connection portion between the first feed line 5 and the first patch pattern 12a. The same transformer line 101 was also formed and matched at the connecting portion of the second feed line 8 and the second patch pattern 12b.
As shown in FIG. 3A, the above-described members are sequentially stacked to constitute a triplate line interlayer connector, and a measuring instrument is connected to the first feed line 5 and the second feed line 8 to supply power. As a result of measuring the reflection loss at the end of the first feed line 5 and the passage loss when power passes from the first feed line 5 to the end face of the second feed line 8 while feeding the power, Equivalent good characteristics could be realized.
[0020]
【The invention's effect】
As described above, with the triplate line interlayer connector of the present invention, a low-loss triplate line interlayer connector having a wide band and stable frequency characteristics can be configured, and an inexpensive tri-plate line with little characteristic change due to assembly errors can be formed. A plate line interlayer connector can be provided.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing an embodiment of the present invention.
2A is a cross-sectional view showing an embodiment of the present invention, FIG. 2B is a plan view of a main portion of the embodiment of the present invention, and FIG. 2C is an embodiment of the present invention. It is another principal part top view.
3A is a cross-sectional view showing another embodiment of the present invention, FIG. 3B is a plan view of an essential part of another embodiment of the present invention, and FIG. It is another principal part top view of an Example.
FIGS. 4A, 4B, and 4C are plan views each showing a connection form of a patch pattern and a feed line used in an embodiment of the present invention.
FIG. 5 is a diagram showing frequency characteristics of reflection loss and passage loss according to an embodiment of the present invention.
FIG. 6 is an exploded perspective view showing a conventional example.
FIG. 7 is a plan view for explaining a problem of a conventional example.
[Explanation of symbols]
1. First ground conductor 2. Second ground conductor Third ground conductor 4a. First dielectric 4b. Second dielectric 7a. Third dielectric 7b. 4. Fourth dielectric material First feed line 8. Second feed line 6. First power supply board 9. Second power supply substrate 10a. First shield spacer 10b. Second shield spacer 11a. Third shield spacer 11b. Fourth shield spacer 12a. First patch pattern 12b. Second patch pattern 13. First slot 14. Second slot 101. Transformer line 102. Matching point 103. gap

Claims (3)

The first feed line (5) sandwiched between the first dielectric (4a) and the second dielectric (4b) between the first ground conductor (1) and the second ground conductor (2). The third dielectric is disposed approximately in the middle of the first triplate line on which the first power supply substrate (6) formed with the second power supply substrate (6) is disposed, and the second ground conductor (2) and the third ground conductor (3). Electrical connection structure with the second triplate line on which the second power supply substrate (9) on which the second power supply line (8) is formed is disposed between (7a) and the fourth dielectric (7b) A connection termination portion of the first feeding line (5) of the first feeding substrate (6) and a connection termination portion of the second feeding line (8) of the second feeding substrate (9). And forming a first patch pattern (12a) and a second patch pattern (12b), respectively, and a first dielectric on the periphery of the first patch pattern (12a) 4a) and the second dielectric (4b) are deleted, and a cutout portion larger than the shape of the first patch pattern (12a) and the first feed line (5) connected thereto is provided at the deleted portion. The first and second shield spacers (10a) and (10b) are provided, and the third dielectric (7a) and the fourth dielectric at the periphery of the second patch pattern (12b) are provided. (7b) and a third shield spacer (11a) having a hollow portion larger than the shape of the second patch pattern (12b) and the second feed line (8) connected to the second patch pattern (12b) ) And a fourth shield spacer (11b), and further, the second ground in a portion located between the first patch pattern (12a) and the second patch pattern (12b). The body (2), a triplate line inter-layer connector which is characterized in that formed the first slot (13). The first patch spacer (12a) and the second patch pattern (12b) are approximately 0.38 times the free space wavelength λ ₀ of the frequency using the length L1 in the line connection direction, and the first shield spacer (10a), the second shield spacer (10b), the third shield spacer (11a), the dimension L2 and the first slot in the line connection direction of the patch peripheral portion of the hollow portion of the fourth shield spacer (11b) The triplate line interlayer connector according to claim 1, wherein the dimension L3 in the line connection direction of (13) is approximately 0.6 times the free space wavelength λ ₀ of the frequency used. The first patch pattern (12a) and the second patch pattern (12b) are circular in shape, the diameter L4 thereof is approximately 0.38 times the free space wavelength λ ₀ of the frequency used, and the first shield The patch peripheral portion of the hollow portion of the spacer (10a), the second shield spacer (10b), the third shield spacer (11a), and the fourth shield spacer (11b) is circular and the diameter L5 is used. The frequency is approximately 0.6 times the free space wavelength λ ₀ , and the shape of the first slot (13) is circular, and the diameter L6 is approximately 0.6 times the free space wavelength λ ₀ of the frequency used. The triplate line interlayer connector according to claim 1.

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