JP3022797B2 - Stripline type high frequency components - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency component using a plurality of strip lines, and more particularly to a chip-type directional coupler.

[0002]

2. Description of the Related Art A perspective view of a conventional high frequency component using a plurality of strip lines is shown in FIG. 5, taking a directional coupler as an example. This conventional example shows a case of the same plane type in which a main line and a sub line are formed on the same substrate. In this configuration, two strip lines 53 and 54 are arranged in parallel at a distance S on the surface of a dielectric substrate 51 having a planar ground conductor 52 formed on the back surface. These striplines 5
The parallel length of 3, 54 is configured to be a quarter of the wavelength of the electromagnetic wave propagating in the dielectric substrate.

The high-frequency power input from the port P1 is
Pass the strip line 53, which is the main line, to the port P2
Is output to At this time, part of the electric power passing through the strip line 53 is reduced due to the line coupling between the strip line 53 as the main line and the strip line 54 as the sub line.
It flows to the strip line 54 and is output to the port P3. At this time, no output appears at the port P4. next,
When power flows in the direction opposite to the main line, that is, the strip line 53, that is, from the port P2 to the port P1, a part of the power appears at the port P4 and does not appear at the port P3. In other words, by adopting such a configuration, a part of the forward power and the reverse power flowing through the strip line 53 of the main line is transferred to the strip line 54 of the sub line.
Can be separated and taken out to the output ports P3 and P4 terminals. This is the basic operation of the directional coupler.

[0004] Line-to-line coupling from the main line 53 to the sub line 54 is performed by a parallel portion of two strip lines.
It is possible by adjusting the interval S.

In the description of the conventional example shown in FIG. 5, the main line and the sub line are the strip lines 53 and 54. However, as is apparent from the symmetrical structure of FIG. 5, even if the roles of the main line and the sub line are switched. Similarly, the basic operation of the directional coupler can be realized.

FIG. 6 shows another example of the prior art, in which a strip line 65 as a main line and a strip line 66 as a sub line are stacked. In this embodiment, a strip line 66 as a sub-line is disposed on the surface of a dielectric substrate 61 having a flat ground conductor 64 formed on the back surface. A dielectric substrate 62 on which a strip line 65 as a main line is formed is disposed above it, and a strip line 65 as a main line and a strip line 66 as a sub line.
Are arranged in parallel at a distance D from each other. A protective dielectric substrate 63 is provided thereon.

FIG. 7 is a perspective view of a directional coupler completed by laminating and firing these three substrates and adding external terminals.

In this case as well, an operation similar to that of FIG. 5 can be realized, and the high-frequency power input from the port P1 is output to the port P2 through the strip line 65 as the main line. At this time, part of the electric power passing through the strip line 65 flows to the strip line 66 due to the line coupling between the strip line 65 as the main line and the strip line 66 as the sub line, and is output to the port P3. At this time, no output appears at the port P4. Next, in the opposite direction of the main line, that is, the strip line 65, that is, the port P
When power flows from port 2 to port P1, part of the power appears at port P4 and does not appear at port P3.
That is, by adopting such a configuration, a part of the forward power and the backward power flowing through the strip line 65 of the main line is separately extracted to the output ports P3 and P4 terminals of the strip line 66 of the sub line. be able to. The line-to-line coupling from the main line 65 to the sub-line 66 is performed by a parallel portion of the two strip lines, and can be made by adjusting the interval in the stacking direction, that is, the thickness D of the dielectric substrate 62.

FIG. 8 shows an example of the prior art described in Japanese Patent Application Laid-Open No. 51-78671. In this prior art, two spiral windings 81 are formed in parallel. FIGS. 9A and 9B are examples of the prior art described in Japanese Patent Application Laid-Open No. 51-78671. FIG. 9A is a plan view showing a spiral winding, and FIG.
It is an AA sectional view of (a). In this conventional technique, the spiral windings 82 are arranged vertically opposite to each other. 8 and 9, the two spiral windings are arranged at the same pitch and at the same interval from the beginning to the end of the windings, although there is a difference between the top and bottom and the left and right. Each becomes an input coupling line and an output coupling line, and when these coupling lines are opposed to each other, they are coupled to each other to form a directional coupler.

The directional coupler having the function of separating a part of the high-frequency power with directivity as described above is used for controlling the transmission power of a transmitter of a microwave communication, for example, a portable telephone. . FIG. 10 shows a block diagram of the application example. The port P1 of the main line 72 of the directional coupler 71,
P2 is arranged between the transmission power amplifier and the antenna 74, one port P3 of the sub-line 73 is connected to the automatic gain control circuit, and the other port P4 is connected to the resistance element 75 for absorbing power. In this case, only a part of the output of the transmission power amplifier appears at the port P3 and is guided to the automatic gain control circuit. Part of the high-frequency power flowing backward from the antenna 74 appears at the port P4 and is absorbed by the resistance element 75. The signal output of the automatic gain control circuit is sent to a transmission power amplifier capable of controlling the gain, and the high-frequency output can be controlled according to the purpose.

[0011]

However, miniaturization of portable telephones is an important issue.
For the directional coupler used for the above purpose, further downsizing is required. In a conventional directional coupler having a quarter wavelength as in the example of FIG. 5, the length of the strip line electrode is, for example, 2.5 cm at 1 GHz (1/3 when the relative dielectric constant εr is about 9). 4 wavelengths), and sufficient miniaturization cannot be expected.
A method of shortening the 1/4 wavelength by using a material having a large relative dielectric constant is also conceivable. However, in order to maintain the impedance of 50Ω, the strip line width becomes extremely thin, and the main line and the sub-line are required In order to obtain such a combination, high processing accuracy is required, for example, the interval between strip lines becomes extremely narrow. For this reason, there has been a problem that the mass productivity is poor and the power durability is deteriorated.

Further, in a conventional structure in which a plurality of strip lines are vertically stacked as shown in FIG. 6, since the two lines are connected in a plane, the range of control is widened, but the size is reduced. Then the situation is no different from the previous example. As one direction of miniaturization, a method of shortening the line length to less than 波長 wavelength can be considered. The characteristics of the prototype directional coupler of FIG. 6 thus produced are shown by the dotted lines in FIG. Here, the propagation loss from the port P1 to the port P2 is called an insertion loss, the propagation loss from the port P1 to the port P3 is called a coupling loss, and the propagation loss from the port P1 to the port P4 is called an isolation. The directional coupler is required to have as small an insertion loss as possible and to have as large an isolation as possible. Coupling loss is a parameter given in designing the entire circuit of a portable telephone or the like. As can be seen from the dotted line in FIG. 3, if the line length is simply shortened using the conventional technology, there is a problem that sufficiently high isolation cannot be realized in a wide frequency range.

Further, in a structure using a pair of spiral windings as shown in FIGS. 8 and 9 of the prior art, it is possible to reduce the size more than in the above-mentioned conventional example. That they are continuously arranged at the same interval and function by the connection between the lines is the same as in the above-described prior art, and there is a limit to miniaturization.

SUMMARY OF THE INVENTION In view of the above, it is an object of the present invention to provide a new type of strip line type high frequency component, taking a miniaturized chip type directional coupler as an example.

[0015]

According to the present invention, there is provided a strip line type comprising a plurality of ground conductors having a spread, and a first strip line and a second strip line arranged in a region sandwiched between the ground conductors. A high-frequency component, wherein the first strip line is a coil type connected to conductors formed on at least two dielectric layers and wound for at least one turn, and the second strip line is A coil formed by connecting conductors formed on at least two dielectric layers and being wound for one or more turns, wherein the first and second coil-type strip lines are vertically arranged in the axial direction of the winding. It is a strip line type high frequency component which is arranged facing and coil-coupled.

Further, in the present invention, the first and second strip lines are formed by laminating at least two or more dielectric layers on which a strip line electrode of less than one turn is formed.
By connecting stripline electrodes of less than one turn, a coiled stripline wound one or more turns is formed.

Further, in the present invention, one of the first coil-type stripline and the second coil-type stripline is used as a main line and the other is used as a sub-line to constitute a directional coupler.

The structure of the present invention, that is, a high-frequency component comprising a plurality of ground conductors having a spread and a plurality of strip lines arranged in a region surrounded by the plurality of ground conductors, wherein the plurality of strip lines Are wound one or more turns, and by using a structure in which the wound portions overlap each other, a small-sized and high-performance microstrip line type high frequency component can be realized.

Further, according to the present invention, it is possible to provide a directional coupler in which the length of the strip line is shortened to 1/8 to 1/15 wavelength. Can be achieved.

[0020]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an assembly component diagram of an embodiment according to the present invention. In addition, a finished product obtained by assembling the components of the embodiment according to the present invention is a chip-type directional coupler 1, and a perspective view thereof is shown in FIG.

A chip type directional coupler 1 according to an embodiment of the present invention comprises a first ground conductor electrode layer 2, strip line electrode layers 3 and 4 for main lines, and a strip line electrode layer for sub lines. 5 and 6, a second ground conductor electrode layer 7, and a protective layer 8 are laminated. For each of these layers, ceramic green sheets for low-temperature sintering are used.

The first ground conductor electrode layer 2 has a ground conductor electrode 2a formed on one surface of the ceramic green sheet except for a small end. At the center end of the ground conductor electrode 2a, two projections are provided, and two external electrodes 2 on the side surface are provided.
b. External electrodes 2c and 2d serving as a main line and a sub line are independently provided on the side surface.

The strip line electrode layer 3 for the main line
Has a strip line electrode 3a and a through-hole round electrode 3e formed on one surface of a ceramic green sheet. One end of the strip line electrode 3a is connected to the external electrode 3c. External electrodes 3 on the side
b, 3c and 3d are provided.

There is another stripline electrode layer for the main line, which is indicated by 4 in the figure. This has a strip line electrode 4a and a through hole 4f formed on one surface of a ceramic green sheet. Strip line electrode 4
One end of a is connected to the external electrode 4c, and the other end is connected to the round electrode 3e for through hole of the strip line electrode layer 3 through the through hole 4f. The strip line electrodes 3a, 4a are connected to form a coil of about two turns. Independent side electrodes 4b, 4c, and 4d are provided on side surfaces of the strip line electrode layer 4.

Stripline electrode layers 5 and 6 for sub-line
Has the same configuration as the main line stripline electrode layers 3 and 4, and the stripline electrodes 5a and 6a are connected by a through-hole 6f and a through-hole round electrode 5e to form a coil of about two turns. Has become. The ends of the strip line electrodes 5a, 6a are connected to the external electrodes 5d, 6d on the side surfaces, respectively. On the side surfaces of the strip line electrode layers 5, 6, independent external electrodes 5b, 5c, 5d, 6b, 6c, 6d are provided, respectively.

The second ground conductor electrode layer 7 has the same structure as the first ground conductor electrode layer 2, and a ground conductor electrode 7a is formed on one surface of the ceramic green sheet except for a small end. . These first ground conductor electrode 2a and second ground conductor electrode 7a are connected to external terminals 2b, 3b, 4b, 5b, 6b, 7b.
And strip line electrodes 3a,
4a, 5a and 6a are sandwiched from above and below. This achieves a shielding effect that prevents high-frequency power from leaking to the outside.

The protective layer 8 is provided with independent external electrodes 8b, 8c and 8e on the side and top surfaces of the green sheet. Each of the green sheets 2 to 8 is stacked after each electrode film is formed by a printing technique, and 900
Fired and integrated at a temperature of at least ℃. As a result, FIG.
Is completed. The external electrodes b, c, and d provided on the side surface of each green sheet are integrated after firing and connected to each other as shown in FIG.
C and D are completed. In the present embodiment, the method of providing the external electrodes b, c, and d on the side surfaces at the stage of the green sheet has been described. However, the external electrodes B, C, and D may be manufactured after firing the green sheet laminate. A high-frequency component having a similar structure can be realized.

The ceramic green sheet of this embodiment is
A dielectric material having a relative dielectric constant εr of about 8 and calcinable at 900 ° C. and having a thickness of 0.15 mm was used. Each electrode was a Cu electrode having a thickness of 15 μm, and the width of the strip line electrode was 0.16 mm. The external dimensions of the chip-type directional coupler completed by laminating and integrally firing are 3.2 ×
It was 1.6 × 1.2 t (mm). As is clear from FIGS. 1 and 2 of this embodiment, it can be seen that the external electrode B corresponds to the ground conductor, the external electrode C corresponds to the main line, and the external electrode D corresponds to the sub line.

The result of measuring the characteristics of the directional coupler manufactured in this embodiment over a wide frequency range from 0.5 GHz to 2 GHz is shown by a solid line in FIG. As is clear from comparison with the dotted line of the prior art, the directional coupler using the technique of the present invention is extremely excellent in terms of insertion loss and isolation. For example, comparing the technology of the present invention with the conventional technology in the 1.5 GHz band, the insertion loss is 0.3 dB.
And 0.5dB, isolation is 48dB and 23dB
There is a difference. In particular, the insertion loss is higher than the higher frequency of 1.9G.
In the Hz band, it appears as a large difference between 0.4 dB and 1.0 dB. Although there is a difference of about 2 dB in the coupling loss, this is a matter given by design and is not directly subject to comparison when discussing performance.

The main point of the present invention is not a U-shaped strip line assuming a distributed constant type line as in the prior art shown in FIGS. 5 and 6, but a lumped constant circuit component as shown in FIG. That is, the coil-shaped strip line is wound one or more times. By using a plurality of such coiled striplines (two in the present embodiment) and coil-coupling a plurality of striplines that are originally distributed constant type lines, high performance can be realized in a wider frequency range. It is what came to be.

Although the prior arts shown in FIGS. 8 and 9 seem to be similar, the prior arts in FIGS. 8 and 9 are based on the same concept as the prior arts in FIGS. Are of different technical ideas. That is, the conventional technique is line coupling, and the present invention is coil coupling.

The line coupling means that two lines are continuously opposed to each other at the same interval, so that the lines are coupled to each other. This can be easily understood from any of FIGS. 5, 6, 8, and 9 by seeing that the two lines are continuously opposed at the same interval.

On the other hand, coil coupling does not have a structure in which two lines are continuously opposed at the same interval. This can be easily understood from FIG.
Although the stripline electrodes 4a and 5a are arranged to face each other, when looking at the electrodes, the portion that actually faces the upper and lower sides is approximately the right and left linear portion in the figure, Not. Moreover, the strip line electrodes 3a, 6
As can be seen from FIG.
It is a structure that does not result in continuous line-to-line coupling at the same interval. In the present invention, the electrodes are not opposed to each other, but when the strip line formed in a coil shape is made into one coil, the coils are opposed to each other.

For this reason, it is important that the coils overlap one another in the direction perpendicular to the winding direction. In this embodiment, therefore, the strip line electrodes 3a, 4a
a, 5a, 6a, except for the lead-out part to the external electrode,
It is formed in a region which is substantially on the same line. That is,
When the strip line electrode is projected from a direction perpendicular to the winding direction and viewed, the annular portions on which the strip line electrodes are formed are formed to overlap. In the present invention, it is most preferable that the strip lines overlap when projected from the direction perpendicular to the winding direction as described above. However, the strip lines are shifted or overlapped without departing from the gist of the present invention. A part that has not been performed may be present in a part.

In the embodiment of the present invention, a strip line having an elongated cross section is used, and the long axis is arranged so as to be parallel to the ground conductor. By doing so, the mounting density in the vertical direction is increased, and strong coupling between the main line and the multiple lines can be realized.

The term "one strip line" used in the present invention refers to a structure in which both ends of the strip line are connected to external electrodes and has two ports. The basic structure of the present invention is that a plurality of the strip lines are included in a region surrounded by a plurality of ground conductors. In this embodiment,
Although the two strip lines are connected to independent external electrodes, the effect of the present invention does not change even if a plurality of strip lines commonly use one external electrode.

Furthermore, in the embodiments of the present invention, a non-magnetic dielectric substrate has been described. However, even if a magnetic substrate is used as a substrate, the effect of the present invention can be realized. , Easy to understand. In particular, an object of the present invention is to couple a plurality of strip lines with a coil in a space surrounded by a ground conductor.
The effect is even greater. In fact, the relative permeability μ is about 2
200 NiMH-Zn-Cu ferrite and 200 MH
A trial production of a matching transformer was performed in the z band, and good results with little impedance change were obtained over a wide band.

In the above embodiment, the total length of the main line composed of the strip line electrodes 3a and 4b and the total length of the sub line composed of the strip line electrodes 5a and 6b are 1/12.
The length was set to correspond to the wavelength. As described above, according to the embodiment of the present invention, the directional coupler, which has conventionally been designed so that the length of the strip line is 1/4 wavelength, is designed to have the length of 1/12 wavelength. It is clear that a significant miniaturization is possible.
Further, according to the configuration of the present invention, it was confirmed that the entire length of the stripline electrode was designed in the range of 1/8 to 1/15 wavelength, and that a directional coupler was achieved. This is because, as described above, a coil-shaped strip line wound one or more turns, similar to a lumped-constant circuit component, is coil-coupled to each other.

FIG. 4 shows an assembly component diagram of another embodiment according to the present invention. FIG. 4 shows a chip-type directional coupler, in which a first ground conductor electrode layer 22, strip line electrode layers 23 and 24 for main lines, strip line electrode layers 25 for sub-lines, 26, a second ground conductor electrode layer 27, and a protective layer 28. For each of these layers, ceramic green sheets for low-temperature sintering are used.

The first ground conductor electrode layer 22 has a ground conductor electrode 22a formed on one surface of the ceramic green sheet except for a small end. Two projections are provided at the center end of the ground conductor electrode 22a, and are connected to the two external electrodes 22b on the side surfaces. External electrodes 22c and 22d serving as a main line and a sub line are independently provided on the side surface.

Strip line electrode layer 2 for main line
In No. 3, a strip line electrode 23a and a through-hole round electrode 23e are formed on one surface of the ceramic green sheet. One end of the strip line electrode 23a is connected to the external electrode 23c. Independent external electrodes 23b, 23c, 23d are provided on the side surfaces.

There is another strip line electrode layer for the main line, which is indicated by 24 in the figure. This has a strip line electrode 24a and a through hole 24f formed on one surface of a ceramic green sheet. One end of the strip line electrode 24a is connected to the external electrode 24c, and the other end is connected to the strip line electrode layer 23 through a through hole 24f.
Is connected to the through-hole round electrode 23e. The strip line electrodes 23a and 24a are connected to form a coil of about two turns. On the side surface of the strip line electrode layer 24, an independent external electrode 24b is provided.
24c and 24d are provided.

The strip line electrode layer 25 for the sub-line,
26 is a strip line electrode layer 23, 24 for the main line.
And the strip line electrodes 25a and 25a
6a is connected by a through-hole 26f and a through-hole round electrode 25e, and has a coil configuration of about two turns. The ends of the strip line electrodes 25a and 26a are connected to the external electrodes 25d and 26d on the side surfaces, respectively. On the side surfaces of the strip line electrode layers 25 and 26, independent external electrodes 25b, 25c and 25 are respectively provided.
d, 26b, 26c, and 26d are provided.

The second ground conductor electrode layer 27 has the same configuration as the first ground conductor electrode layer 22, and a ground conductor electrode 27a is formed on one surface of the ceramic green sheet except for a small end. . These first ground conductor electrode 22a and second ground conductor electrode 27a are connected to external terminals 22b, 23b, 24b,
The strip line electrodes 23a, 24a, 25a, and 26a are connected to each other by 25b, 26b, and 27b, and sandwich the strip line electrodes 23a, 24a, 25a, and 26a from above and below. This achieves a shielding effect that prevents high-frequency power from leaking to the outside.

The protective layer 28 has independent external electrodes 28b, 28c and 28e provided on the side and top surfaces of the green sheet. Each of the green sheets 22 to 28 is stacked after each electrode film is formed by a printing technique, and is fired and integrated at a temperature of 900 ° C. or more. As a result, a directional coupler having the same structure as the directional coupler 1 shown in FIG. 2 is completed.

In this embodiment, a coil of about two turns is formed spirally on one green sheet.
With two green sheets, it is not easy to pull out the terminal of the coil, and as a result, a coil of about two turns is created with two green sheets. Also in this embodiment, a directional coupler having characteristics similar to those of the above-described embodiment can be formed. Thus, in the present invention, the present invention can be implemented even if the strip line electrode is formed in a spiral shape. Also in this case, when the coils of the stripline electrode are projected and viewed from a direction perpendicular to the winding direction, the coils are formed so as to overlap.

Also in this embodiment, the coils are arranged so as to face each other. However, although the electrodes forming the coils partially face each other, they do not have a structure in which they continuously face each other. That is, it is understood that the coupling is not a line coupling but a coil coupling.

As described above, by using the technique of the present invention, a very small chip type directional coupler excellent in high frequency characteristics in a wide band can be obtained. In this embodiment, the directional coupler has been described. However, a plurality of strip lines are arranged in an area surrounded by a plurality of ground conductors, and each of the plurality of strip lines is wound for at least one turn. However, the technology of the present invention, which is characterized by a structure in which the respective winding portions overlap each other, is a more general idea, and can be applied to other strip line type high frequency components such as a distributor and a matching transformer. It is clear.

[0049]

As described above in detail with reference to the embodiments, a very small and high-performance chip-type directional coupler can be constructed using the technique of the present invention. A high-frequency component having a similar structure is extremely useful for miniaturization of a microwave component for a cellular phone or the like.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an embodiment according to the present invention.

FIG. 2 is a perspective view of one embodiment according to the present invention.

FIG. 3 is a characteristic comparison diagram of an example according to the present invention and a conventional technology.

FIG. 4 is an exploded perspective view of another embodiment according to the present invention.

FIG. 5 is a perspective view of a conventional technique.

FIG. 6 is an exploded perspective view of another related art.

FIG. 7 is a perspective view of another prior art.

FIG. 8 is a plan view of another related art.

FIG. 9 is a plan view (a) and a sectional view (b) of another example of another conventional technique.

FIG. 10 is a circuit block diagram of a usage example of a directional coupler.

[Explanation of symbols]

1 chip directional coupler 2, 7, 22, 27 ground conductor electrode layer 3, 4, 5, 6, 23, 24, 25, 26 strip line electrode layer 8, 28 protective layer 2a, 7a, 22a, 27a ground Conductor layer 3a, 4a, 5a, 6a, 23a, 24a, 25a, 2
6a strip line electrodes 2b, 3b, 4b, 5b, 6b, 7b, 8b, 22b,
23b, 24b, 25b, 26b, 27b, 28b External electrodes for ground conductor electrodes 2c, 3c, 4c, 5c, 6c, 7c, 8c, 22c,
23c, 24c, 25c, 26c, 27c, 28c Main line external electrodes 2d, 3d, 4d, 5d, 6d, 7d, 8d, 22d,
23d, 24d, 25d, 26d, 27d, 28d External electrode for sub-line 3e, 5e, 23e, 25e Round electrode for through hole 4f, 6f, 24f, 26f Through hole

Continuation of the front page (56) References JP-A-7-131211 (JP, A) JP-A-51-78671 (JP, A) JP-A-57-21102 (JP, A) JP-A-5-160614 (JP) JP-A-5-152814 (JP, A) JP-A-54-51445 (JP, A) JP-A-50-110089 (JP, A) JP-A-5-90029 (JP, A) 5-144651 (JP, A) Japanese Utility Model Showa 56-174840 (JP, U) Japanese Utility Model Showa 61-40008 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01P 5/18 H01F 17/00

Claims (3)

(57) [Claims] 1. A strip line type high frequency component comprising: a plurality of ground conductors having a spread; and a first strip line and a second strip line arranged in a region sandwiched between the ground conductors. The first strip line is a coil type connected to conductors formed on two or more dielectric layers and wound for one or more turns, and the second strip line is a first strip line.
A dielectric layer different from that for the line, a coil formed by connecting conductors formed on two or more dielectric layers and being wound for one or more turns; The coil-type strip lines are disposed so as to face each other up and down in the axial direction of the winding , and are coil-coupled. The lengths of the first and second coil-type strip lines are:
A strip line type high frequency component, wherein each wavelength is 1/8 to 1/15. 2. The method according to claim 1, wherein the first and second strip lines are formed by stacking at least two dielectric layers on each of which a strip line electrode having less than one turn is formed and connecting the strip line electrodes having less than one turn. 2. The strip line type high frequency component according to claim 1, wherein the strip type high frequency component is constituted by a coil type strip line wound one or more turns. 3. The directional coupler according to claim 1, wherein one of the first coil type strip line and the second coil type strip line is a main line and the other is a sub line. 2. The strip line type high frequency component according to 2.