JP2009021668A - Circuit board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inexpensively and easily adjust the length of a slot line when the slot line is formed on an inner layer of a mutllayer substrate. <P>SOLUTION: The slot line formed on the inner layer of the mutlilayer substrate is connected to a GND pattern of a surface layer via a plurality of adjusting through holes. The GND pattern includes a pattern releasing portion having the shape very similar to that of the slot line. By changing the shape of the pattern releasing portion, the frequency characteristics of the slot line can be adjusted similarly to changing of the shape of the slot line. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a circuit board, and more particularly to a circuit board capable of adjusting the frequency characteristics of a slot line provided.

  In the multilayer circuit board, one circuit may be separated into a plurality of layers. Therefore, the circuit board area can be saved when components are mounted on the circuit. In view of this advantage, in the technical field of the microwave communication system, a slot line type single balance mixer configured on a multilayer circuit board is used as one of its application fields.

First, a conventional slot line type single balance mixer circuit will be described.
FIGS. 1A and 1B are a perspective plan view and a cross-sectional view, respectively, of a slot line type single balance mixer circuit constituted by a two-layer printed circuit board. As shown in FIG. 1B, a first conductor layer (hereinafter referred to as “first layer”) and a second conductor layer (hereinafter referred to as “second layer”) are formed on the front and back of one dielectric substrate. Has been. In the two-layer printed circuit board, the first and second layers on the front and back sides are outer layers.

  In the plan perspective view of FIG. 1A, the first layer on the near side is drawn with a solid line. Moreover, what is drawn with a broken line is the second layer located on the back side of the dielectric layer.

  Three microstrip line circuits 10, 11, and 12 are formed in the first layer. That is, an RF pattern 10 for inputting an RF (Radio Frequency) signal, an LO pattern 11 for supplying an LO (Local Oscillator) signal, and an IF (Intermediate Frequency) signal are output. And an IF pattern 12 for

  Slot lines 13 are formed in the second layer. The slot line 13 is a part from which a part of the conductor is extracted in the second layer whose entire surface is a conductor. The slot line 13 has a shape in which one line is connected at a right angle at the center of one side of the rectangular frame. Therefore, for convenience, the slot line 13 is divided into two parts and hereinafter referred to as “frame-like slot line 13b” and “linear slot line 13a”. In addition, the area | region inside the frame-shaped slot line 13b is electrically insulated from the outer side by the frame-shaped slot line 13b.

  The RF pattern 10, LO pattern 11, IF pattern 12, and slot line 13 are connected by a plurality of through holes 14, and further two diodes 15 are connected, so that a slot line type single balance mixer circuit is provided. Is formed.

  In general, in a slot line type single balance mixer circuit, first, an RF signal is input from the RF pattern 10 and an LO signal is input from the LO pattern 11. Next, the RF signal and the LO signal are mixed through the slot line 13 and the two diodes 15, and as a result, the IF signal is output from the IF pattern 12. Here, the length of the linear slot line 13a is preferably a quarter wavelength of the RF signal. Hereinafter, the wavelength of the RF signal is expressed as “λ”.

  If the wavelength λ of the RF signal used in the slot line type single balance mixer circuit is determined in advance, the length of the linear slot line 13a should be designed to be optimum. However, in reality, it may be affected by external factors such as connection of other circuits. As a result, the characteristics as a mixer circuit, such as isolation, may not be ensured well. In such a case, it is necessary to adjust the frequency characteristic by adjusting the length of the linear slot line 13a.

Next, a case where a conventional slot line type single balance mixer circuit is formed on a multilayer substrate will be described.
FIGS. 2A and 2B are a plan perspective view and a cross-sectional view, respectively, of a slot line type single balance mixer circuit constituted by a four-layer printed board. As shown in FIG. 2B, the slot line type single balance mixer circuit of the four-layer board is the same as that of the two-layer board of FIG. 1, but the second dielectric layer, the third layer, and the third board. Equivalent to the addition of a dielectric layer and a fourth layer in a stacked manner. Since the first layer and the second layer are exactly the same as in the case of the two-layer printed board shown in FIG.

  Arbitrary circuit patterns can be formed by providing microstrip patterns and slot lines in the third and fourth layers. Further, an arbitrary electronic component or another circuit board or the like may be connected to the fourth layer which is the surface layer.

  In addition, since the connection by various through-holes 14 and 24 penetrates all the layers of a board | substrate, all the 1st-4th layers are connected. Therefore, the circuits formed in the third layer and the fourth layer can input and output signals to any place of the single balance mixer circuit.

  As described above, from the viewpoint of efficiency in mounting on a multilayer board, a slot line type mixer circuit is often formed in the inner layer of the multilayer board. However, in this case, the RF patterns 10 and 20, the LO patterns 11 and 21, and the IF patterns 12 and 22 formed on the outer layer of the substrate can be adjusted, but it is difficult to adjust the slot line 23 on the inner layer of the substrate.

  The following method is generally used to adjust the length of the linear slot line 23a. For example, the length of the linear slot line 23a can be shortened by short-circuiting the end of the already completed linear slot line 23a with a conductor. Further, the length of the linear slot line 23a can be extended by removing the conductor at the tip of the linear slot line 23a. However, this is effective when the circuit pattern is formed on the outer layer of the substrate, but cannot be applied as it is to the circuit pattern formed on the inner layer of the substrate. In that case, there is a method in which the substrate above the slot line 23 is removed and the slot line 23 is exposed when the substrate is manufactured. However, if such special processing is used, the manufacturing cost of the substrate becomes high.

  In relation to the above, Patent Document 1 (Japanese Utility Model Publication No. 61-113404) discloses an invention relating to a microwave integrated circuit. The microwave integrated circuit of the invention of Patent Document 1 uses a slot line or fine line. The slot line or fine line is configured by providing a groove in a ground conductor provided on one surface of the first dielectric plate. One or more of the second dielectric plates are fixed on the first dielectric plate. The second dielectric plate has one or a plurality of slit conductors having a predetermined length orthogonal to a groove provided in the installation conductor on one surface.

  Patent Document 2 (Japanese Patent Laid-Open No. 5-29818) discloses an invention relating to a TEM mode resonator. The TEM mode resonator according to the invention of Patent Document 2 has an outer conductor surface having a ground potential and a floating line conductor located away from and parallel to the ground conductor. A standing wave current flows through the line conductor, and a TEM or quasi-TEM mode electromagnetic field exists around the line conductor. On the outer conductor surface, a slot line with both ends short-circuited at right angles to the line is provided at a position closest to the line conductor. The resonance frequency can be changed by changing the length of the slot line.

  Patent Document 3 (Japanese Patent Laid-Open No. 8-162853) discloses an invention relating to a slot line type single balance mixer. The slot line type single balance mixer of the invention of Patent Document 3 includes a first GND (Ground ND) pattern and a second GND pattern. Here, the first GND pattern is formed on almost the entire surface of one of the plurality of inner layers. The second GND pattern is formed in an inner layer different from the first GND pattern. The length l outside the GND conversion through hole satisfies l <λ / 8. Where λ = the effective wavelength of the frequency handled by the mixer. Mixer circuits are formed on the uppermost layer and the lowermost layer of the multilayer printed board. A GND pattern for shielding these mixer circuits is formed on a plurality of inner layers. These GND patterns are connected by a GND conversion through hole to perform GND conversion.

  Patent Document 4 (Japanese Patent Laid-Open No. 10-294620) discloses an invention relating to a slot line type single balance mixer. The slot line type single balance mixer of the invention of Patent Document 4 is formed by unifying the ground pattern of the mixer circuit on the inner layer of the multilayer substrate with the ground pattern of other strip lines. Here, in the slot line type single balance mixer, a mixer circuit is formed on the uppermost layer of the multilayer substrate. A ground pattern is formed on the inner layer and the lowermost layer of the multilayer substrate. Furthermore, the ground pattern of each layer is connected by a through hole for ground conversion.

Japanese Utility Model Publication No. 61-113404 Japanese Patent Laid-Open No. 5-29818 JP-A-8-162853 Japanese Patent Laid-Open No. 10-294620

An object of the present invention is to provide a circuit board including a slot line, which is formed in an inner layer of a multilayer board and can be adjusted easily after manufacture at a low cost.
Another object of the present invention is to provide a method for adjusting a slot line formed in the inner layer of such a multilayer substrate.

  Hereinafter, means for solving the problem will be described using the numbers used in (Best Mode for Carrying Out the Invention). These numbers are added to clarify the correspondence between the description of (Claims) and (Best Mode for Carrying Out the Invention). However, these numbers should not be used to interpret the technical scope of the invention described in (Claims).

The circuit board according to the present invention includes a dielectric substrate and a plurality of through holes (36). The dielectric substrate has a first conductor layer and a second conductor layer formed on both the front and back surfaces. A ground pattern is formed on the first conductor layer. A linear slot line is formed in the second conductor layer. The plurality of through holes (36) penetrate the dielectric substrate and conduct the ground pattern (37) and the linear slot line (33a).
The ground pattern (37) includes a pattern release section. Here, the pattern release portion exposes the dielectric substrate along the linear slot line (33a) and is wider than the linear slot line (33a).
The plurality of through holes (36) are formed on both sides of the pattern release portion.

  The circuit board of the present invention further includes another circuit board laminated on the second conductor layer side of the dielectric substrate.

In the slot line type single balance mixer circuit of the present invention, the circuit board of the present invention includes a mixer circuit surface layer portion (30, 31, 32, 35), a frame-shaped slot line (33b), and a plurality of signal through holes ( 34). Here, the mixer circuit surface layer portions (30, 31, 32, 35) are formed on the first surface of the dielectric substrate. The frame-like slot line (33b) is further formed on the second surface of the dielectric substrate and is connected to the linear slot line (33a). The plurality of signal through-holes (34) penetrate the dielectric substrate and connect the mixer circuit surface layer portions (30, 31, 32, 35) and the conductor layer on the second surface of the dielectric substrate.
The mixer circuit surface layer (30, 31, 32, 35) includes an RF pattern (30), an LO pattern (31), an IF pattern (32), and two diodes (35). Here, the RF pattern (30) is for inputting or outputting an RF signal. The LO pattern (31) is for receiving an LO signal. The IF pattern (32) is for outputting or inputting an IF signal.

  In the slot line type single balance mixer circuit of the present invention, the ground pattern (37) covers a portion of the dielectric substrate corresponding to the tip of the linear slot line (33a).

In the slot line type single balance mixer circuit of the present invention, the pattern release portion exposes a portion of the dielectric substrate corresponding to the tip portion of the linear slot line (33a).
The slot line type single balance mixer circuit of the present invention further includes a through hole (36). Here, the through hole (36) allows the second conductor layer and the ground pattern (37) to be dielectrically formed at the tip of the linear slot line (33a) and the tip of the pattern release portion, respectively. Conducts through the body substrate.

  In the slot line adjustment method of the present invention, (a) in the multilayer circuit board, the length of the linear slot line (33a) formed in the conductor layer sandwiched between two continuous dielectric layers is Indirect adjustment by adjusting the ground pattern (37) formed on the surface of the circuit board and conducted to the conductor layer; and (b) In the ground pattern (37), a linear slot line ( The same effect as that obtained by changing the shape of the pattern release portion, which is a portion where the dielectric layer is exposed along 33a), and (c) the length of the linear slot line (33a) is obtained. To be provided.

In the slot line adjustment method of the present invention, the step (b) includes (b-1) removing a portion of the conductor layer included in the ground pattern (37) adjacent to the tip of the pattern release portion, and (b- 2) A part of the dielectric layer corresponding to the linear slot line (33a) is exposed by removing a part of the ground pattern (37).
Further, the step (c) includes changing the frequency characteristic of the linear slot line (33a) as in the case where the length of the (c-1) linear slot line (33a) is extended.

In the slot line adjustment method of the present invention, step (b) includes (b-3) attaching the adjustment conductor plate (39) to the tip of the pattern release portion, and (b-4) adjusting conductor. By attaching the plate (39), the portion corresponding to the linear slot line (33a) of the dielectric layer is covered with the conductor.
Further, the step (c) includes that the frequency characteristic of the linear slot line (33a) is changed as in the case where the length of the linear slot line (33a) is shortened (c-2).

According to the circuit board of the present invention, the slot line formed in the inner layer of the multilayer board is connected to a surface GND (Ground: Ground) pattern through a plurality of adjustment through holes. This GND pattern is provided with a pattern release portion having a shape very similar to the slot line. By changing the shape of the pattern release portion, an effect close to changing the shape of the slot line can be obtained.
According to the slot line adjustment method of the present invention, instead of directly adjusting the slot line formed in the inner layer of the multilayer substrate, the shape of the pattern release portion formed in the surface layer of the multilayer substrate may be adjusted. Adjustment processing for the surface layer of the multilayer substrate is inexpensive and easy. Therefore, the trouble of redesigning and remanufacturing the multilayer substrate can be saved.

  The best mode for carrying out a circuit board according to the present invention will be described below with reference to the accompanying drawings.

(First embodiment)
FIG. 3 is a perspective view for explaining the four-layer structure of the slot line type single balance mixer circuit according to the first embodiment of the present invention.
The single balance mixer circuit of this embodiment is configured on a four-layer substrate. That is, it includes four conductive substrates and three dielectric substrates positioned between them. Although the circuit board of this embodiment has a four-layer structure, the present invention is applicable as long as it has a two-layer structure or more. However, the true value of the present invention is exhibited when the slot line is formed between two dielectric layers, which is based on the premise that the circuit board has a three-layer structure or more. Become.

  In the circuit board of this embodiment, the four conductive boards are referred to as the first to fourth layers in order from the top for convenience. Slot line type single balance mixer circuits are formed in the first layer and the second layer.

  FIG. 4A is a perspective plan view of the single balance mixer circuit according to this embodiment. The first layer on the near side is drawn with a solid line, and the second layer on the other side of the dielectric is drawn with a broken line. The third layer and the fourth layer are not shown.

  In the first layer, an RF pattern 30, an LO pattern 31, and an IF pattern 32 are formed, and two diodes 35 are provided. A GND pattern 37 is also formed on the first layer.

  A slot line 33 is located in the second layer. Among them, the end of the linear slot line extends toward the end of the second layer, but does not reach the end. In other words, there is a sufficient distance between the tip of the cleaning slot line and the end of the second layer so that an adjustment through hole 36 described later is provided.

  Note that the shapes of the RF pattern 30, the LO pattern 31, the IF pattern 32, and the slot line 33 are not limited to those shown in FIGS. For example, the pattern shape may be bent according to other design reasons.

  The shape of the GND pattern 37 of the first layer is approximately rectangular, but a part of the pattern is removed and the dielectric is exposed. This is hereinafter referred to as a “pattern release unit”. The pattern release portion is provided to prevent the influence of the first layer conductor on the electromagnetic characteristics of the second layer slot line 33. When the dielectric substrate located between the first layer and the second layer is seen through, it is designed with a slight margin so as not to overlap with the slot line 33. Accordingly, it is desirable that the width of the pattern release portion is slightly larger than the width of the slot line 33. Hereinafter, the length of the pattern release part is denoted as “L”.

  The third layer and the fourth layer are not particularly limited as the present invention. That is, any pattern or circuit may be formed on the third layer and the fourth layer. Further, any electronic component may be provided on the fourth layer corresponding to the back surface of the circuit board.

  The circuit board is formed with a plurality of through holes 34 and 36 penetrating all the conductor substrates and all the dielectric layers. These through holes 34 and 36 are for electrically connecting, that is, electrically connecting all the conductor substrates at the positions.

  These through holes 34 and 36 are divided into a signal through hole 34 and an adjustment through hole 36 according to the purpose. The main purpose of the signal through hole 34 is to connect each component of the slot line type single balance mixer circuit. The main purpose of the signal through hole 36 is to connect the slot line 33 to the GND pattern 37.

The connection of each component of the slot line type single balance mixer circuit will be described.
The RF pattern 30 on the first layer is electrically connected to the second layer through the first signal through hole 34. The first signal through hole 34 is located outside the frame-like slot line 33b and beside the linear slot line 33a.

  Next to the signal through hole 34, the second signal through hole 34 is used, which is also located outside the frame-like slot line 33a and on the side of the linear slot line. The second signal through hole 34 connects the slot line 33 of the second layer and the cathode of the first diode 35 of the first layer.

  The anode of the first diode 35 is connected to the third signal through hole 34 and the cathode of the second diode 35.

  The third signal through hole 34 is located inside the frame-shaped slot line 33b of the second layer. Here, the third signal through hole 34 is located in the vicinity of the connecting portion between the linear slot line 33a and the frame-like slot line 33b.

  The anode of the second diode 35 is connected to the fourth signal through hole 34.

  The fourth signal through-hole 34 is located outside the second-layer frame-like slot line 33b and beside the linear slot line 33a. Here, the fourth signal through hole 34 is located on the opposite side of the first or second signal through hole 34 with the linear slot line interposed therebetween.

  A fifth signal through hole 34 is also connected to the inside of the second layer frame-like slot line 33b. Here, the fifth signal through hole 34 is at a position opposite to the third signal through hole 34, that is, at a position farthest from the connecting portion between the linear slot line 33 a and the frame slot line 33 b. positioned.

  The fifth signal through hole 34 is connected to the LO pattern 31.

  The LO pattern 31 is connected to the IF pattern 32.

  The plurality of adjustment through holes 36 connect the first layer GND pattern 37 and the second layer slot line 33. The plurality of adjustment through holes 36 connect both sides of the pattern release portion of the GND pattern 37 and the tip of the tip, and both sides of the linear slot line 33a and the tip of the tip. Here, all the adjustment through holes 36 are located at a distance within 1 / 4λ of the RF frequency from the linear slot line 33a in the second layer.

  The RF pattern 30 formed in the first layer, the LO pattern 31, the IF pattern 32, the two diodes 35, and the slot line 33 formed in the second layer are connected by a plurality of signal through holes 34. Has been. This part operates as a slot line type single balance mixer circuit. Since the single balance mixer circuit itself is a conventional technique, description of its basic operation is omitted.

  FIG. 5 is a perspective plan view of the slot line type single balance mixer circuit according to this embodiment when the slot line 33 is ideally adjusted. For example, when the distance between the third signal through hole 34 and the fifth signal through hole 34 is measured along the frame inside the frame-shaped slot line 33b, the RF frequency It is desirable that it is 1 / 4λ. Secondly, it is desirable that the length of the linear slot line 33a is 1 / 4λ of the RF frequency.

  However, in this embodiment, since the slot line 33 is formed between the two dielectric layers, the length of the linear slot line 33a cannot be directly adjusted. Therefore, in the present invention, instead, the shape of the pattern release portion of the GND pattern 37 connected to the linear slot line 33a via the plurality of adjustment through holes 36 is adjusted. As a result, the frequency characteristic of the linear slot line 33a can be adjusted in the same manner as the length of the linear slot line 33a.

  FIG. 4B is a plan view of the slot line type single balance mixer circuit after adjustment. Compared to FIG. 4A, an adjustment conductor plate 38 is added.

  FIG. 4C is a cross-sectional view of FIG. 4B taken along line C-C ′. The adjustment conductor plate 38 is formed on the first layer GND pattern 37. The adjustment conductor plate 38 and the GND pattern 37 are electrically connected. Therefore, the addition of the adjustment conductor plate 38 is equivalent to the shortening of the pattern release portion of the GND pattern 37. Assuming that the length of the pattern release portion is L and the length of the region of the pattern release portion that overlaps the adjustment conductor plate 38 is L ′, the length of the pattern release portion is shortened to L−L ′.

At this time, the frequency characteristic of the linear slot line 33a is adjusted in the same manner as the linear lot line 33a is shortened by about L '. In this way, it is possible to adjust the length of the linear slot line 33a to be 1 / 4λ of the RF frequency.

  However, an error has occurred by a length of (2La + Lb). Here, La is the distance from the slot line 33 to the adjustment through hole 36. Lb is the distance from the GND pattern of the first layer to the slot line of the second layer, that is, the thickness of the dielectric layer between them.

  Of course, the dielectric thickness Lb cannot be reduced to zero.

(Second embodiment)
FIG. 4A is a perspective plan view for explaining the first layer and the second layer in the four-layer structure of the slot line type single balance mixer circuit according to the present embodiment. Since there are many common points between the present embodiment and the first embodiment, only the difference between them will be described, and the description of the common points will be omitted.

  There are two main differences. The first is a pattern release section in the first layer GND pattern. In the first embodiment, the pattern release portion is formed so as not to cover the linear slot line when the dielectric layer is seen through. The pattern release portion of this embodiment is somewhat shorter than that of the first embodiment so as to cover the tip portion of the linear slot line when the dielectric layer is seen through.

  The second difference is the adjustment through hole 36 that connects the GND pattern of the first layer and the slot line of the second layer. The adjustment through hole 36 at the tip of the linear slot line provided in the first embodiment is not the present embodiment.

  FIG. 4B is a plan view of each of the four layers for explaining the adjustment method in the slot line type single balance mixer circuit according to this embodiment. In the first embodiment, the linear slot line pattern length of the linear slot line of the slot line type single balance mixer circuit can be indirectly reduced. In the present embodiment, on the contrary, adjustment is performed by indirectly increasing the length of the linear slot line.

  In the present embodiment, by extending the length of the pattern release portion, the frequency characteristics of the linear slot line 33a can be adjusted in the same manner as when the linear slot line 33a is lengthened. For this purpose, a part of the GND pattern 37 is scraped off, and the pattern release portion is expanded along the linear slot line 33a.

  For example, in the case of FIGS. 6A and 6B, the length of the pattern release portion of the GND pattern 37 is extended from L to L + L ″ by scraping the adjustment GND pattern region 39.

  At this time, it is desirable that the width of the pattern release portion is uniform. Further, it is desirable that the extended pattern release portion does not expose the tip of the linear slot line 33a when viewed through the dielectric layer.

  As in the first embodiment, the length of the linear slot line can be indirectly reduced. That is, the frequency characteristic of the linear slot line 33a can be adjusted in the same manner as the length of the linear slot line 33a is shortened by adding the adjustment conductor plate 38 to shorten the length of the pattern release portion. is there. Therefore, in this embodiment, the length of the linear slot line 33a can be adjusted in both the extension and shortening directions, although it is indirect.

  In the description so far, the single balance mixer circuit in which the RF signal and the LO signal are input and the IF signal is output is discussed in both the first and second embodiments. This is a single balance mixer circuit operating as a down converter. However, since the essence of the present invention is the connection between the slot line 33 and the GND pattern, the single balance mixer circuit does not necessarily have to operate as a down converter. That is, the present invention can also be applied to a single balance mixer circuit that operates as an up-converter that receives an IF signal and an LO signal and outputs an RF signal.

  Furthermore, the application range of the present invention is not limited to a single balance mixer circuit. Therefore, the present invention can be applied to all circuit boards including the slot line 33, the GND pattern 37 for adjusting the length thereof, and the adjusting through hole 36 for connecting the two.

FIG. 1 is a perspective plan view (a) and a sectional view (b) for explaining a two-layer structure of a single balance mixer circuit according to the prior art. FIG. 2 is a perspective plan view (a) and a sectional view (b) for explaining a four-layer structure of a single balance mixer circuit according to the prior art. FIG. 3 is a perspective view for explaining the four-layer structure of the single balance mixer circuit according to the first embodiment of the present invention. FIG. 4 is a diagram for explaining a single balance mixer circuit according to the first embodiment of the present invention. FIG. 4A is a perspective plan view for explaining the relationship between the first layer and the second layer in the single-balance mixer circuit having a four-layer structure. FIG. 4B is a perspective plan view when an adjustment conductor plate is added to the single balance mixer circuit of FIG. FIG. 4C is a cross-sectional view of FIG. FIG. 5 is a perspective plan view of the slot line type single balance mixer circuit according to the first embodiment of the present invention when the slot line is ideally adjusted. FIG. 6 is a perspective plan view (a) and a sectional view (b) for explaining a four-layer structure of a single balance mixer circuit according to a second embodiment of the present invention.

Explanation of symbols

10, 20, 30 RF pattern 11, 21, 31 LO pattern 12, 22, 32 IF pattern 13, 23, 33 Slot line 13a, 23a, 33a Linear slot line 13b, 23b, 33b Frame-shaped slot line 14, 24, 34 Signal through holes 15, 25, 35 Diode 16, 26 Second layer (slot line conductor layer)
36 Through hole for adjustment
37 GND pattern
38 Conductor plate for adjustment
39 GND pattern area for adjustment

Claims (8)

A dielectric substrate having a first conductor layer and a second conductor layer respectively formed on both front and back surfaces;
A ground pattern is formed on the first conductor layer,
A linear slot line is formed in the second conductor layer, and includes a plurality of through holes that pass through the dielectric substrate and connect the ground pattern and the linear slot line,
The ground pattern is
The dielectric substrate is exposed along the linear slot line, and has a pattern releasing portion wider than the linear slot line,
The plurality of through holes are formed on both sides of the pattern release portion. The circuit board according to claim 1,
A circuit board further comprising another circuit board stacked on the second conductor layer side of the dielectric substrate. The circuit board according to claim 1 or 2,
A mixer circuit surface layer portion formed on the first surface of the dielectric substrate;
A frame-shaped slot line further formed on the second surface of the dielectric substrate and connected to the linear slot line;
A plurality of signal through-holes that pass through the dielectric substrate and connect the surface layer of the mixer circuit and the conductor layer on the second surface of the dielectric substrate;
The mixer circuit surface layer part is
An RF pattern for inputting or outputting an RF (Radio Frequency) signal;
LO pattern for supplying LO (Local Oscillator) signal;
IF pattern for outputting or inputting IF (Intermediate Frequency) signal;
Slot line type single balance mixer circuit comprising two diodes. The slot line type single balance mixer circuit according to claim 3,
The ground pattern covers a portion of the dielectric substrate corresponding to a tip portion of the linear slot line. Slot line type single balance mixer circuit. The slot line type single balance mixer circuit according to claim 3,
The pattern release portion exposes a portion of the dielectric substrate corresponding to a tip portion of the linear slot line,
A through hole that conducts the second conductor layer and the ground pattern through the dielectric substrate at the tip of the linear slot line and the tip of the pattern release portion, respectively. A slot line type single balance mixer circuit. (A) In a multilayer circuit board, the length of a linear slot line formed in a conductor layer sandwiched between two continuous dielectric layers is formed on the surface of the multilayer circuit board so that the conductor layer Is adjusted indirectly by adjusting the ground pattern conducted to
(B) In the ground pattern, the shape of the pattern release portion that is a portion where the dielectric layer is exposed along the linear slot line is changed;
(C) A slot line adjustment method comprising: obtaining an effect similar to that obtained when the length of the linear slot line is changed. The slot line adjustment method according to claim 6, wherein
The step (b)
(B-1) removing a portion of the conductor layer of the ground pattern adjacent to the tip of the pattern release portion;
(B-2) The part corresponding to the linear slot line of the dielectric layer is exposed by removing a part of the ground pattern,
The step (c)
(C-1) A slot line adjustment method comprising: changing frequency characteristics of the linear slot line as in the case where the length of the linear slot line is extended. The slot line adjustment method according to claim 6 or 7,
The step (b)
(B-3) an adjustment conductor plate is affixed to the tip portion of the pattern release portion;
(B-4) A portion of the dielectric layer corresponding to the linear slot line is covered with a conductor by attaching the adjustment conductor plate,
The step (c)
(C-2) A slot line adjustment method comprising changing frequency characteristics of the linear slot line in the same manner as when the length of the linear slot line is shortened.

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