JP2001196813A - Planar line connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a planar line connector reduced in the deterioration of transmission characteristic and small in power loss even when dimentional derivation is caused as its manufacturing time. SOLUTION: In the second conductor layer B-B' of the planar line connector T1, the second strip line 6 having a matching element 5 at its terminal is provided in parallel to the first strip line 4, and the first ground metallic layer 7 is provided around the element 5. The third conductor layer C-C7 consists of the second ground metallic layer 8. Since the line 4 and the line 6 are connected electromagnetically to each other through the element 5, the characteristic deterioration of impedance matching, etc., can be reduced even when some dimentional deviation is caused. Furthermore, the element 5 is shielded with a short-circuit metallic layer 3 and the layer 8, and the layer 3, the layer 7 and the layer 8 are respectively kept at almost the same potential, thus power leakage from the element 5 to the surrounding is more surely suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planar line connector for connecting a plurality of strip lines for transmitting power in a high frequency band such as a microwave and a millimeter wave, and more particularly, to a flat line connector even if a connection portion has a dimensional deviation. The present invention relates to a low-loss planar line connector with small characteristic deterioration.

[0002]

2. Description of the Related Art In microwave and millimeter wave circuits composed of a plurality of dielectric substrates, strip lines are formed between the dielectric substrates, and connections between the strip lines formed in different layers are required. Becomes As a method of connecting between strip lines provided in different layers, a method of directly connecting between strip lines with through holes is generally known.

FIGS. 8 and 9 are a perspective view and a sectional view, respectively, of a conventional planar line connector (T101). Further, FIG. 10 shows the present planar line connector (T1
01) is a GG ′ plan view (a), an HH ′ plan view (b), and an II ′ plan view (c).

[0004] Prior art planar line connectors (T10)
1) includes a first conductor layer (GG ′) and a second conductor layer (H-G ′).
H '), a first dielectric substrate (101) is provided, and a second dielectric substrate (102) is provided between the second conductor layer (HH') and the third conductor layer (II '). This is a five-layer structure planar line connector provided. A first strip line is provided on the first conductor layer (GG ′).
(103) is provided. In addition, the second conductor layer (H-
H ′) is provided with a first ground metal layer (104) and a second strip line (105).

Further, the second conductor layer (II ′) has
A ground metal layer line (106) is provided, and the first through hole (107) directly connects the first strip line (103) and the second strip line (105). The second through hole (108) is provided to make the first ground metal layer (104) and the second ground metal layer line (106) have the same potential.

[0006]

In the above-described planar line connector according to the prior art, strip lines having a high current density are directly connected to each other by through holes. If it occurs, there is a problem that the transmission characteristics are deteriorated. In particular, this phenomenon becomes remarkable in a high frequency band such as a millimeter wave.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a planar line connection with small deterioration in transmission characteristics and small power loss even when a dimensional deviation occurs during manufacturing. Is to realize a vessel.

[0008]

In order to solve the above-mentioned problems, the following means are effective. That is, the first means comprises a five-layer structure in which a first dielectric substrate is provided between a first conductor layer and a second conductor layer, and a second dielectric substrate is provided between a second conductor layer and a third conductor layer. In the planar line connector having the structure, the first conductor layer includes a short-circuit metal layer having a notch and a first strip line disposed inside the notch, and the second conductor layer includes a second strip line. , A matching element formed at the end of the second strip line, a first ground metal layer, a third conductor layer including a second ground metal layer, and a first strip line and a second strip line. Electromagnetic coupling through a matching element.

A second means is the first means, wherein a first through hole is provided in the first dielectric substrate for electrically connecting the short-circuit metal layer and the first ground metal layer. That is.

[0010] The third means may be the first or the second means.
Means for providing a second through hole in the second dielectric substrate in order to electrically connect the first ground metal layer and the second ground metal layer.

Further, the fourth means includes the first to third means.
In any one of the means, the first strip line is:
The insertion length ρ1 that is the depth overlapping the matching element is 15% of the element length L1 that is the length of the matching element in the direction of the insertion length ρ1.
More than 25%.

Further, the fifth means includes the first to fourth means.
In any one of the means, a second notch is provided on both sides of the second strip line at a connection portion of the matching element with the second strip line.

[0013] The sixth means may include the first to fifth items.
In any one of the means, the insertion length ρ2 of the second strip line, which is the depth of the second cut portion, is set to 20% or more of the element length L1 which is the length of the matching element in the insertion length ρ1 direction.
0% or less.

[0014] The seventh means may include the first to sixth means.
In any one of the means, the element length L1 is set to about 1 / １ ／ of the wavelength λ of the electromagnetic wave connected and propagated by the plane line connector.
2

Further, the eighth means includes the first to seventh means.
In any one of the means, by adjusting the element width L2 which is the length of the matching element in the direction perpendicular to the direction of the insertion length ρ1, the frequency bandwidth D of the electromagnetic wave connected / propagated by the plane line connector is adjusted. Adjusting the value.

Further, the ninth means may be any one of the first to eighth embodiments.
In any one of the means, the distance g between the matching element and the first ground metal layer is set to be 10% or more and 20% or less of the element length L1 which is the length of the matching element in the insertion length ρ1 direction.

A tenth means is that, in any one of the first to ninth means, a plurality of first strip lines are provided.

According to an eleventh aspect, in the tenth aspect, at least two or more first strip lines are arranged in parallel with each other or arranged so as to face each other on the same straight line. is there.

A twelfth means is that, in the tenth or eleventh means, at least two or more first strip lines are arranged so that their wiring directions cross each other at an arbitrary angle.

The thirteenth means may be arranged so that the matching element according to any one of the first to twelfth means,
This is to provide a plurality of second strip lines.

According to a fourteenth aspect, in the thirteenth aspect, at least two or more second strip lines are arranged in parallel with each other or arranged so as to face each other on the same straight line. is there.

According to a fifteenth means, in the thirteenth or fourteenth means, at least two or more second strip lines are arranged such that their wiring directions cross each other at an arbitrary angle. .

According to a sixteenth means, in any one of the first to fifteenth means, at least one set of a first strip line and a second strip line arranged in parallel with each other is provided. That is.

In a seventeenth aspect, according to any one of the first to sixteenth aspects, at least one or more sets of the first strip line and the second strip line, which are in a twist relationship, are provided. It is. With the above means, the above-mentioned problem can be solved.

[0025]

According to the above-mentioned first means, since the first strip line and the second strip line are electromagnetically coupled via the matching element, even if a slight dimensional deviation occurs, the impedance is reduced. Characteristic deterioration such as matching can be suppressed to a small level. Further, since the matching element that resonates is shielded by the short-circuit metal layer and the second ground metal layer, power leakage from the matching element to the surroundings is sufficiently suppressed.

Also, impedance matching can be achieved by the insertion length of the first strip line into the short-circuit metal layer and the insertion length of the second strip line into the matching element. Furthermore, the frequency band in which power is transmitted and converted can be determined by the size of the matching element. That is, by appropriately adjusting these parameters, it is possible to realize a planar line connector with less loss in a desired frequency band.

According to the second or third means, a conductor such as a metal is embedded in the first through hole or the second through hole provided in the first dielectric substrate and the second dielectric substrate. A short-circuit metal layer and a first ground metal layer, or
The first ground metal layer and the second ground metal layer can have the same potential. As a result, power leakage from the matching element to the surroundings can be further suppressed.

According to the fourth to sixth means, by adjusting the parameters ρ1 and ρ2,
The impedance matching of the planar line connector of the present invention can be achieved.

Further, according to the above-mentioned seventh means, the center of the frequency band of the electromagnetic wave handled by the planar line connector according to the present invention can be determined more easily and accurately than before.

Further, according to the eighth means, the bandwidth D of the frequency band of the electromagnetic wave handled by the planar line connector of the present invention can be determined more easily and accurately than in the past.

According to the ninth means, the power loss can be further reduced.

Further, according to the tenth to seventeenth means, by providing at least one or more required number of the first strip lines or the second strip lines, the planar line connector is provided. It becomes possible to arbitrarily set the input direction and the output direction of the power to the motor. As a result, it is possible to freely distribute and combine power simultaneously with the connection between the strip lines.

[0033]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on specific embodiments. However, the present invention is not limited to the embodiments described below. (First Embodiment) FIGS. 1 and 2 are a perspective view and a cross-sectional view, respectively, of a planar line connector T1 of the first embodiment. FIG. 3 shows an AA ′ plan view (a), a BB ′ plan view (b), and a CC ′ plan view (c) of the planar line connector T1.

In the planar line connector (T1), a first dielectric substrate (1) is provided between a first conductor layer (AA ') and a second conductor layer (BB'). The conductor layer (BB ′) and the third
This is a planar line connector having a five-layer structure in which a second dielectric substrate (2) is provided between conductor layers (CC '). First conductor layer (A
-A ') is provided with a cut short-circuit metal layer (3) and a first strip line (4) inside the cut.

A second strip line (6) is provided on the second conductor layer (BB ') in parallel with the first strip line (4), and a matching end is provided at the end of the second strip line (6). element
(5) is formed. Except for the vicinity of the second strip line (6), a first ground metal layer (7) is provided around the matching element (5) at a predetermined distance from the matching element (5). Third
The conductor layer (C-C ') is composed of the second ground metal layer (8).

The first through hole (9) provided in the first dielectric substrate (1) and the second through hole (10) provided in the second dielectric substrate (2) are respectively buried. Shorting metal layer (3) and first ground metal layer
(7) and a first ground metal layer (7) and a second ground metal layer (8)
Are kept at the same potential.

If the plane line connector is constructed like the plane line connector (T1) of the first embodiment, the first strip line
Since (4) and the second strip line (6) are electromagnetically coupled via the matching element (5), even if a slight dimensional deviation occurs, deterioration of characteristics such as impedance matching can be suppressed. The matching element (5) that resonates is a short-circuit metal layer (3)
And the second ground metal layer (8), the leakage of power from the matching element (5) to the surroundings is sufficiently suppressed.

Further, the insertion length ρ1 of the first strip line (4) into the short-circuit metal layer (3) and the second strip line
Impedance matching can be achieved with the insertion length ρ2 of the matching element (5) of (6). Where ρ1 is the first
The strip line (4) and the matching element (5) have a length that overlaps in a direction parallel to the first strip line (4), and ρ2 is the length of the second strip line (6) and the matching element (5). In the connecting portion, the depth is two cuts (second cuts) Γ provided on both sides of the second strip line (6).

Quantitatively, the insertion length ρ1 of the first strip line (4) is set to 15% to 25% of the length L1 of the matching element (5), and the insertion length ρ2 of the second strip line (6) is set to the matching element (5). ) 20 of length L1
% To 30%, impedance matching can be achieved.

Further, by setting the length L1 of the matching element (5) parallel to the first stripline (4) and the second stripline (6) to approximately 1/2 of the wavelength λ to be used in the dielectric, The center of the frequency band (bandwidth D) to be used can be determined. Also, the length of the matching element (5) perpendicular to L1,
That is, by increasing the element width L2, the frequency bandwidth D
Can be widened.

Further, by embedding a conductor such as a metal in the first through hole (9) and the second through hole (10) provided in the first dielectric substrate (1) and the second dielectric substrate (2), Short-circuit metal layer (3), first ground metal layer (7), and second ground metal layer (8)
Are maintained at substantially the same potential. Thereby, the matching element
Power leakage from (5) to the surroundings is more reliably suppressed.

The matching element (5) and the first ground metal layer (7)
Is set to 10% to 20% of the length L1 of the matching element (5), the electromagnetic field near the matching element is not disturbed, and the above-mentioned effect of the through hole can be sufficiently exhibited. it can. Thereby, power loss can be minimized. Since the first through-hole (9) and the second through-hole (10) are provided at a place where the current density is low, even if these through-holes are slightly misaligned, the characteristics such as impedance matching and the like are deteriorated. Is small enough.

(Second Embodiment) FIGS. 4 and 5 are a perspective view and a sectional view, respectively, of a planar line connector T2 of a second embodiment. FIG. 6 shows the D- of the plane line connector T2.
D 'plan view (a), EE' plan view (b), and F-
F 'plan view (c) is shown, respectively.

The present planar line connector (T2) is a planar line connector having two first strip lines (14) and one second strip line (16). That is, the plane line connector (T2) of FIGS. 4, 5, and 6 has the same structure as the plane line connector (T1) of FIGS. 1, 2, and 3 except for the number of strip lines. (11) to (20) correspond to (1) to (10).

If the plane line connector is configured as in the second embodiment, the power distribution and the power distribution can be performed simultaneously with the connection of the strip line.
Compositing is also possible. Further, in the second embodiment, the number of the first strip lines (14) is two, but the number of the second strip lines (16) may be two. Further, the first strip line (14) and the second strip line (1
The number of 6) may be three or more.

In each of the above embodiments, the shape of the matching element is substantially rectangular, but the shape of the matching element may be substantially circular, substantially elliptical, substantially ring-shaped, or the like. In each of the above embodiments, the traveling directions of the propagation signals of the first stripline and the second stripline are the same, but these traveling directions may be opposite to each other.

Further, in each of the above embodiments, the first strip line and the second strip line are arranged in parallel. For example, as shown in FIG.
Alternatively, by removing the small pieces from the matching element, the first strip line and the second strip line can be arranged orthogonally (but more strictly, in a “twisted relationship”).

The angle at which a certain first strip line intersects with another first strip line is not limited to a right angle but may be arbitrary. Also, the angle at which one certain second stripline intersects with another second stripline is not limited to a right angle, and is arbitrary. Also, the angle at which one certain first stripline and one certain second stripline intersect (however, more strictly, “the wiring direction vectors of the respective striplines when arranged in a twisted relationship are different from each other. The angle formed by each other is not limited to a right angle but may be arbitrary.

The direction in which power is propagated along each of these strip lines is arbitrary. This is the same even when an arbitrary pair of strip lines are arranged in parallel with each other. Therefore, the planar line coupler of the present invention can be used as a plane line coupler having both the power distribution function and the power combining function at the same time.

[Brief description of the drawings]

FIG. 1 is a perspective view of a planar line connector T1 according to a first embodiment.

FIG. 2 is a cross-sectional view of the planar line connector T1 according to the first embodiment.

FIGS. 3A and 3B are an AA ′ plan view, a BB ′ plan view, and a CC ′ plan view of the planar line connector T1 according to the first embodiment.

FIG. 4 is a perspective view of a planar line connector T2 according to a second embodiment.

FIG. 5 is a sectional view of a planar line connector T2 according to a second embodiment.

FIGS. 6A and 6B are a DD ′ plan view, an EE ′ plan view, and an FF ′ plan view of a planar line connector T2 according to a second embodiment.

FIGS. 7A to 7D are plan views of matching element shapes illustrating other modified examples;

FIG. 8 is a perspective view of a conventional flat line connector T101.

FIG. 9 is a cross-sectional view of a conventional planar line connector T101.

FIG. 10 shows G of a plane line connector T101 according to the prior art.
-G 'plan view (a), HH' plan view (b), and I-
I 'plan view (c).

[Explanation of symbols]

 T1 Plane line connector 1 First dielectric substrate 2 Second dielectric substrate 3 Short-circuit metal layer 4 First strip line 5 Matching element 6 Second strip line 7 First ground metal layer 8 Second ground metal layer 9 ... first through hole 10 ... second through hole

Claims (17)

[Claims] A first dielectric substrate is provided between a first conductor layer and a second conductor layer, and a second dielectric substrate is provided between the second conductor layer and a third conductor layer.
A five-layer planar line connector provided with a dielectric substrate, wherein the first conductor layer has a short-circuit metal layer having a notch, and a first strip line disposed inside the notch. , The second conductor layer has a second strip line, a matching element formed at an end of the second strip line, and a first ground metal layer, and the third conductor layer has a second strip line. A planar line connector having a ground metal layer, wherein the first strip line and the second strip line are electromagnetically coupled via the matching element. 2. A first dielectric substrate for electrically connecting the short-circuit metal layer to the first ground metal layer.
The flat line connector according to claim 1, wherein a through hole is provided. 3. A second through hole is provided in the second dielectric substrate to electrically connect the first ground metal layer and the second ground metal layer. 3. The planar line connector according to claim 1 or 2. 4. An insertion length ρ1, which is a depth at which the first strip line overlaps the matching element, is one of an element length L1, which is a length of the matching element in the direction of the insertion length ρ1.
2. The method according to claim 1, wherein the content is 5% or more and 25% or less.
The planar line connector according to any one of claims 3 to 3. 5. The connecting device according to claim 2, wherein the matching element is provided at a connection portion with the second strip line.
The planar line connector according to any one of claims 1 to 4, further comprising a second cut portion on both sides of the strip line. 6. The insertion length ρ2 of the second strip line, which is the depth of the second cut portion, is at least 20% of the element length L1, which is the length of the matching element in the direction of the insertion length ρ1,
The planar line connector according to any one of claims 1 to 5, wherein the ratio is 30% or less. 7. The device according to claim 1, wherein the element length L1 is approximately の of a wavelength λ of an electromagnetic wave connected and propagated by the plane line connector. A flat line connector according to claim 1. 8. The frequency width D of the electromagnetic wave connected / propagated by the plane line connector is adjusted by adjusting an element width L2 which is a length of the matching element in a direction perpendicular to the direction of the insertion length ρ1. The planar line connector according to any one of claims 1 to 7, wherein a value is adjusted. 9. A distance g between the matching element and the first ground metal layer is not less than 10% and not more than 20% of an element length L1 which is a length of the matching element in the direction of the insertion length ρ1. The planar line connector according to any one of claims 1 to 8, wherein: 10. The planar line connector according to claim 1, wherein a plurality of the first strip lines are provided. 11. The plane according to claim 10, wherein at least two or more of the first strip lines are arranged in parallel with each other, or are arranged so as to face each other on the same straight line. Track connector. 12. The flat line connector according to claim 10, wherein the wiring directions of at least two or more first strip lines cross each other at an arbitrary angle. 13. The planar line connector according to claim 1, wherein the matching element has a plurality of the second strip lines. 14. The plane according to claim 13, wherein at least two or more of the second strip lines are arranged in parallel with each other or arranged so as to face each other on the same straight line. Track connector. 15. The planar line connector according to claim 13, wherein at least two or more second strip lines have wiring directions crossing each other at an arbitrary angle. 16. The semiconductor device according to claim 1, further comprising at least one set of said first strip line and said second strip line arranged in parallel with each other. Flat line connector. 17. A combination of the first strip line and the second strip line in a twist relationship,
17. The method according to claim 1, wherein the number of the sets is at least one.
The planar line connector according to any one of the above items.