JP2001185916A - Antenna feeder line and antenna module using same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such problems that high-efficiency feeding can not be performed by an antenna feeder which feeds an antenna element through a slot provided to a dielectric waveguide line owing to reflection due to the discontinuity of impedance at a slot part. SOLUTION: This antenna feeder is constituted by providing the slot 4 to an upper main conductor layer 2 of the dielectric waveguide line formed of the upper main conductor layer 2 of a dielectric substrate 1, a lower main conductor layer 3, and two arrays of through conductor groups 5 and subordinate conductor layers 6 and feeds a high-frequency signal to an antenna element arranged thereupon; and a ground conductor 7 which is 1/8 to 6/8 time as long as the interval of an H surface and made of a conductor rod and/or a conductor layer is arranged at a distance 1/8 to 4/8 time as large as the interval of an E surface from the E surface perpendicularly to a signal transmission direction. Consequently, reflection loss is reducible and high-efficiency feeding is enabled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric waveguide line which is a feed line of an arbitrary antenna element suitable for communication using a high frequency signal such as a microwave band or a millimeter wave band. The present invention relates to an antenna feed line capable of reducing the reflection at a connection portion of an element and supplying power with high efficiency, and an antenna module using the same.

[0002]

2. Description of the Related Art A slot feeding antenna for feeding an antenna element from a feed line via a slot is proposed as an example of a method for feeding an antenna element that radiates electromagnetic waves such as microwaves and millimeter waves. Slot feed is widely used because of its simple structure, and a feed using a microstrip line, a strip line, a coplanar line, a waveguide line, or the like as a feed line has been proposed. In addition, in order to obtain a desired antenna radiation pattern, it is widely practiced to arrange antenna elements to form an array. In this case, a feed line is branched according to the number of elements and power is supplied in series or in parallel. It becomes necessary. The microstrip line, the strip line, and the coplanar line have a problem that unnecessary radiation of an electromagnetic wave may occur when there is a portion where impedance is discontinuous, or interaction may occur between the lines.

On the other hand, the present inventor has disclosed in Japanese Patent Laid-Open No. 10-303612.
In Japanese Patent Application Laid-Open Publication No. H11-157, a structure is proposed in which a slot is provided in a conductor layer of a dielectric waveguide line that can be formed by a conductor layer and a via hole (via conductor) in a multilayer laminated structure, and power is supplied to an antenna element. According to this feed line structure, the electromagnetic wave is transmitted only in the region surrounded by the conductor, so that there is no unnecessary radiation and the interaction between the lines can be eliminated.

[0004]

However, even in a feed line that feeds an antenna through a slot provided in a dielectric waveguide line, impedance is discontinuous in the slot portion. Therefore, at the frequency at which the slot resonates, the reflection is minimized, and feeding to the antenna is performed without any problem. However, at frequencies other than the resonance frequency, reflection occurs at the slot. There is a problem that the reflected waves of the slots are accumulated and the total reflection becomes very large.

The present invention has been devised to solve such a conventional problem, and has as its object to provide an antenna feed line for feeding an antenna element through a slot provided in a dielectric waveguide line. Accordingly, an object of the present invention is to provide an antenna feed line capable of suppressing reflection loss in a slot at a desired frequency and feeding power to an antenna element with high efficiency.

It is another object of the present invention to provide an antenna module having high radiation efficiency and good radiation characteristics, wherein the antenna element is electrically connected to the antenna feed line.

[0007]

The inventor of the present invention has studied the above problems, and as a result, it has been found that a conductor rod of a via hole and a conductor layer of a metallized pattern are formed at a position separated from the slot by a predetermined distance. It has been found that by arranging one or more conductors, reflection generated in the slot can be reduced. Further, it has been found that reflection can be further reduced by setting the length of the conductor to an appropriate dimension.

That is, the antenna feed line of the present invention comprises:
An upper main conductor layer formed on the upper surface of a dielectric substrate formed by laminating a plurality of dielectric layers, a lower main conductor layer formed below the dielectric substrate, and formed in the dielectric substrate; Two rows of through conductor groups, each of which includes a plurality of through conductors that electrically connect the upper main conductor layer and the lower main conductor layer at predetermined intervals, and a sub-connector that electrically connects each of the through conductor groups between the dielectric layers. A dielectric waveguide line formed of a conductor layer and transmitting a high-frequency signal by a transmission region surrounded by upper and lower surfaces of the upper main conductor layer and the lower main conductor layer and side surfaces of the through conductor group and the sub conductor layer. An antenna feed line configured to provide a conductor non-forming portion in the upper main conductor layer, and to feed the high-frequency signal to the antenna element disposed on the conductor non-forming region through the conductor non-forming portion, Non-conductor In the transmission region at a distance of 1/8 to 4/8 of the signal wavelength from the forming portion to the input side of the high-frequency signal, the signal is transmitted from the upper or lower surface or the side surface forming the E plane of the dielectric waveguide line in the signal transmission direction. At a distance of 1/8 to 4/8 of the vertical distance between the upper and lower surfaces or the side surfaces forming the E surface, 1/8 to 6 of the distance between the upper and lower surfaces or the side surfaces forming the H surface.
A ground conductor having a length of / 8 and comprising a conductor bar and / or a conductor layer is provided.

Further, an antenna module according to the present invention has an antenna feed line having the above-described configuration, and an opening disposed on the upper main conductor layer of the antenna feed line and supplied with a high-frequency signal through the non-conductor-formed region. A planar antenna or a linear antenna is provided.

[0010] The antenna feed line of the present invention has the problem that the impedance is discontinuous due to the provision of the conductor-free region, which is a slot for feeding, in the dielectric waveguide line, and the electromagnetic wave of the high-frequency signal is reflected. １ ／ of the signal wavelength from the slot to the signal input side in parallel to the signal transmission direction
At a distance of 1/2 of the distance of the dielectric waveguide line.
1/8 of the width between the E planes of the dielectric waveguide line perpendicular to the E plane
For reflection suppression, a conductor rod and / or a conductor layer having a length of 1/8 to 3/4 of the distance (thickness) between the H planes of the dielectric waveguide is provided at a distance of about 1/2. Are arranged to reduce the reflection of the electromagnetic wave. The position where the grounding conductor made of the conductor rod and / or the conductor layer is provided is set so that the electromagnetic wave reflected by the slot is reflected again by the grounding conductor made of the conductor rod and / or the conductor layer to cancel each other out. Things. As a result, highly efficient power supply to the antenna element can be performed.

Further, the antenna module of the present invention is arranged on the antenna feed line of the present invention having the above-described configuration and on the upper main conductor layer of the antenna feed line, and receives a high-frequency signal through the non-conductor-formed region. The antenna element to be used, such as an aperture antenna (laminated aperture antenna, horn antenna, etc.) or a linear antenna (patch antenna, microstrip antenna, printed dipole antenna, etc.). Efficient power supply is possible, and as a result, the antenna can function as a microwave band or millimeter wave band antenna having good radiation characteristics.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an antenna feed line and an antenna module according to the present invention will be described with reference to the drawings.

FIG. 1 is a schematic perspective view for explaining the configuration of an embodiment of an antenna feed line and an antenna module according to the present invention. The antenna feed line is a partially broken perspective view, and is connected to the antenna feed line. The antenna elements constituting the antenna module are separately shown in a perspective view.

In FIG. 1, reference numeral 1 denotes a plurality of dielectric layers 1a.
A dielectric substrate formed by laminating 1b and 1c, an upper main conductor layer 2 formed on the upper surface of the dielectric substrate 1, and a dielectric substrate 1
Below, here the lower main conductor layer formed on the lower surface. The two main conductor layers 2 and 3 sandwich the dielectric substrate 1 from above and below, and form conductor walls on the upper and lower surfaces of the dielectric waveguide. Reference numeral 4 denotes a slot provided in the upper main conductor layer 3 as a conductor non-formed portion. The antenna element disposed on the slot 4 is supplied with a high frequency signal transmitted through the dielectric waveguide line to the antenna element. Is what you do.

Reference numeral 5 denotes a plurality of through conductors formed in the dielectric substrate 1 and formed to electrically connect the upper main conductor layer 2 and the lower main conductor layer 3 with a predetermined repetition interval. And two rows of through conductor groups. The plurality of through conductors in each row constituting the through conductor group 5 are arranged at a repetition interval of less than half the signal wavelength of the high-frequency signal. Note that the repetition interval is not necessarily limited to a constant value, and may be set by combining various values at less than half the signal wavelength.

6 is an upper main conductor layer 2 and a lower main conductor layer 3
The sub-conductor layer is formed between the dielectric layers 1a to 1c in parallel with each other and electrically connects each column of the through conductor group 5 between the dielectric layers 1a to 1c. This sub-conductor layer 6 is formed as a single layer or a plurality of layers as necessary, and forms a conductor wall on the side surface of the dielectric waveguide line in the dielectric substrate 1 together with the two rows of through conductor groups 5.

As described above, the dielectric waveguide is formed in the dielectric substrate 1 by the space surrounded by the upper main conductor layer 2, the lower main conductor layer 3, and the conductor wall including the plurality of through conductors 5 and the sub conductor layers 6. Lines are formed. The upper and lower main conductor layers 2 and 3 form the upper and lower surfaces of the transmission region of the dielectric waveguide line, and the through conductor group 5 and the sub-conductor layer 6 form the side surface of the transmission region. A signal is transmitted.

There is no particular limitation on the thickness of the dielectric substrate 1, ie, the distance between the upper and lower main conductor layers 2 and 3 (between the upper and lower surfaces of the dielectric waveguide line). Is the distance (width) between two rows of through conductor groups 5
About 1/2 or 2 times of the above.
In the example shown in FIG. 1, the portions corresponding to the H-plane of the dielectric waveguide are the upper and lower main conductor layers 2.3 (upper and lower surfaces), and the portions corresponding to the E-plane are the through conductor group 5 and the sub-conductor layer 6 (side surface). )
Respectively. On the other hand, if the interval between the upper and lower main conductor layers 2 and 3 is about twice as large as the interval (width) between the two rows of through-conductor groups 5, the portion corresponding to the E-plane of the dielectric waveguide line is reduced. Upper and lower main conductor layers 2 and 3 (upper and lower surfaces)
And the portion corresponding to the H plane is the through conductor group 5 and the sub-conductor layer 6
(Side surfaces).

7 is formed and arranged at a predetermined position from the slot 4 in the transmission region of the dielectric waveguide line.
This is a ground conductor for suppressing reflection, which is formed of a conductor rod and / or a conductor layer. In this example, two ground conductors 7 are provided, and the antenna feed line of the present invention is configured as described above. The ground conductor 7 may be formed by a conductor bar, a conductor layer, or a combination of a conductor bar and a conductor layer as described later.

In the antenna feed line of the present invention, by arranging these grounding conductors 7 at predetermined positions, a high-frequency signal transmitted through the dielectric waveguide line and fed to the antenna element through the slot 4 is provided. The electromagnetic wave of the high-frequency signal reflected by the slot 4 is reflected again by the ground conductor 7 to cancel each other, so that the reflection of the electromagnetic wave of the high-frequency signal by the slot 4 is reduced.

The position where the ground conductor 7 made of the conductor rod and / or the conductor layer is provided is, first, from the slot 4 to the input side of the high-frequency signal to １ ／ to ／ (１ ／) of the signal wavelength.
Within the transmission region of the dielectric waveguide line at a distance of This is because the electromagnetic waves reflected by the slots 4 and the electromagnetic waves reflected by the ground conductor 7 cancel each other out by superposition, so that the reflected waves can be weakened. In particular, when the distance is close to 2/8 (1/4) of the signal wavelength, the phases of the high-frequency signal incident on the slot 4 and the reflected high-frequency signal are reversed, so that the reflected waves can be canceled more effectively and minimized. Can be reduced to the level.

The position where the ground conductor 7 is provided is one of the distance between the upper and lower surfaces or the side surfaces perpendicular to the signal transmission direction and from the upper and lower surfaces or the side surfaces forming the E surface of the dielectric waveguide line. It is desirable to set the position at a distance of / 8 to 4/8 (1/2). This is because the reflection generated by the ground conductor 7 changes depending on the position of the ground conductor 7, and it is therefore preferable to select a position where the reflection has a desired value in the above range.

The ground conductor 7 is formed of a dielectric waveguide line.
It is provided perpendicularly to the H plane, and its length is 〜 of the distance between the upper and lower surfaces or the side surfaces forming the H plane.
It is desirable to have a length of 6/8 (3/4). That is, it is desirable that the length of the ground conductor 7 be １ ／ to ／ of the thickness or width of the transmission region in a direction perpendicular to the H-plane of the dielectric waveguide. This is because the length of the ground conductor 7 is 1/8.
When the length is less than 6/8, the effect of reflecting the electromagnetic wave of the high-frequency signal reflected by the slot 4 again by the ground conductor 7 tends to be hardly expected. This is because, depending on the frequency, the reflection may increase.

As described above, if the H plane of the dielectric waveguide line is the upper and lower surfaces, for example, the ground conductor 7 is connected to the high frequency signal input side from the slot 4 by １ ／ to ／ (信号) of the signal wavelength. 1
In the transmission region of the dielectric waveguide line at a distance of (/ 2), a distance perpendicular to the signal transmission direction from the side surface forming the E plane and 1/8 to 4/8 (1/2) of the interval between the side surfaces. It is desirable to dispose a ground conductor 7 having a length of 1/8 to 6/8 (3/4) of the distance between the upper and lower surfaces forming the H plane at the position.

On the other hand, 8 is a dielectric substrate, 9 is an antenna element of a type that can be fed by a slot 4 such as an aperture antenna or a linear antenna, and in this example, an antenna element of a laminated aperture antenna described later. Thus, an antenna is formed which can reduce the reflection at the slot 4 and prevent the reflection from being accumulated and becoming extremely large particularly in the case of serial feeding. By arranging the antenna element 9 of this antenna on the slot 4 of the antenna feed line of the present invention, the antenna module of the present invention is configured.

Then, the electromagnetic wave of the high-frequency signal supplied to the dielectric waveguide line is supplied to the antenna element 9 disposed above via the slot 4, and the power supplied from the slot 4 is supplied from the antenna element 9. Radiated.

In this example, an example is shown in which a laminated aperture antenna is used as an antenna disposed on the slot 4. However, this antenna may be another linear antenna or an aperture antenna. An antenna can be configured by connecting an arbitrary antenna as long as power can be supplied by the antenna power supply line of the present invention.

FIGS. 2A and 2B are a sectional view taken along the line AA 'and a sectional view taken along the line BB' of the antenna feed line shown in FIG. 1, respectively. Have the same reference numerals. As shown in these figures, the ground conductor 7 for suppressing reflection, which is made of a conductor rod and / or a conductor layer,
From the center of the slot 4 to the input side of the high-frequency signal parallel to the signal transmission direction of the dielectric waveguide line, d =
A signal is transmitted from a through conductor group 5 and a sub-conductor layer 6 which form the dielectric waveguide line at a position within the transmission region at a distance of λo / 8 to λo / 2, in this example, the side surface of the transmission region. Perpendicular to the direction and at a distance of w = t / 8 to t / 2 with respect to the distance between the side surfaces, that is, the width t of the dielectric waveguide line, and the length l of the dielectric waveguide line is In this example, the upper and lower main conductor layers 2.
3 with respect to the distance h between the upper and lower surfaces in the direction perpendicular to 3
/ 8 to 6h / 8. The ground conductor 7 is grounded by being electrically connected to the upper main conductor layer 2 which is grounded.

FIG. 2C is a sectional view similar to FIG. 2B showing a ground conductor 7 in another example of the embodiment of the antenna feed line of the present invention. As shown in FIG. 2 (c), by forming the conductor layer constituting the ground conductor 7 for suppressing reflection continuously with the sub-conductor layer 6, the ground state can be maintained similarly to the upper and lower main conductor layers 2.3. The sub-conductor layer 6 may be electrically connected to ground. In addition, such a ground conductor 7 for suppressing reflection may be formed only of a conductor bar or may be formed only of a conductor layer as long as the above-described predetermined position and length conditions are satisfied. Things.

The dielectric layers 1a to 1c forming the dielectric substrate 1 in the antenna feed line of the present invention can be formed into a sheet having an appropriate thickness, and the upper main conductor layer 2 and the lower main conductor layer are formed by a metallized layer or the like. 3 and a conductor layer such as the sub-conductor layer 6 can be formed. Further, a through-conductor group 5 including via conductors and through-hole conductors can be formed. Glass ceramic, an organic resin, or a mixture of an organic resin and an inorganic powder such as a ceramic can be used.

In order to reduce the transmission loss of the high frequency signal transmitted by the dielectric waveguide line as much as possible, the dielectric loss of the dielectric material forming the dielectric substrate 1 is preferably small. It is desirable that the frequency be 0.001 or less.

Further, the dielectric substrate 1 or the dielectric layer 1a
1c, the conductor layers such as metallized layers serving as the upper main conductor layer 2, the lower main conductor layer 3, the sub-conductor layer 6, etc., and the via conductors and the through-hole conductors serving as the through conductor group 5 are the same. In order to reduce the transmission loss of the high-frequency signal transmitted by the dielectric waveguide line as much as possible, it is preferable that the conductor is formed of a low-resistance conductor. Specifically, at least one of gold, silver, and copper is mainly used. It is desirable to use a conductor made of an alloy material as a component.

Next, specific examples of the antenna feed line and the antenna module of the present invention will be described with reference to the schematic perspective view shown in FIG.

In FIG. 3, reference numeral 11 denotes a plurality of dielectric layers 11a to 11a.
A dielectric substrate formed by laminating 11c, 12 is an upper main conductor layer formed on the upper surface of the dielectric substrate 11, 13 is a lower main conductor layer formed below the dielectric substrate 11, and 14 is a lower main conductor layer A slot 15 formed in 13 is a square opening having an area a × b formed in the upper main conductor layer, and a slot 14 is formed in the lower main conductor layer 13 facing the center of the opening 15. . 16 and
Reference numeral 17 denotes a plurality of through conductors and sub-conductor layers formed in the dielectric substrate 11 around the opening 15 respectively. Due to the space surrounded by the antenna conductor wall composed of the upper main conductor layer 13, the lower main conductor layer 14, the plurality of through conductors 16, and the sub conductor layer 17,
In the dielectric substrate 11, the area connected to the slot 14 is a
A laminated aperture antenna element comprising a rectangular parallelepiped spatial resonator having a size of xb and a thickness of c is formed.

As a feed line for feeding power from the slot 14 to this spatial resonator, the present inventor has disclosed in
Based on the dielectric waveguide line proposed in No. 75108,
The antenna feed line 22 of the present invention is used. The antenna feed line 22 includes a dielectric substrate 18 formed by laminating a plurality of dielectric layers 18a to 18c below the lower main conductor layer 13 of the laminated aperture antenna element as an upper main conductor layer. ,
The lower main conductor layer 19, two rows of through conductor groups 20 electrically connecting the upper and lower main conductor layers 13 and 19 with a predetermined width at a repetition interval of less than half of a high frequency signal, and an upper and lower conductor A sub-conductor layer 21 formed between the dielectric layers 18a to 18c in parallel with the body layers 13 and 19 and electrically connected to the through conductor group 20;
A high-frequency signal is transmitted through a transmission region formed with the upper and lower main conductor layers 13 and 19 as upper and lower surfaces and two rows of through conductor groups 20 and sub-conductor layers 21 as side surfaces.

In the antenna feed line 22, since the upper main conductor layer 13 is provided with the slot 14, which is a portion where no conductor is formed, the impedance becomes discontinuous and a high-frequency signal is reflected. A ground conductor 23 for suppressing reflection formed of a conductor layer is arranged from the center of the slot 14 to the input side parallel to the signal transmission direction of the antenna feed line 22 at a position of d = λo / 4 with respect to the signal wavelength λo.
22 is disposed at a position of w = t / 5 with respect to an interval t between the side surfaces forming the E plane perpendicular to the signal transmission direction and corresponding to the width of the antenna feed line 22 from the side forming the E plane. Length l
Is set to 1 = 2h / 3 with respect to the distance h between the upper and lower surfaces forming the H plane of the antenna feed line 22.

With the antenna module of the present invention having the antenna feed line 22 of the present invention having such a configuration and an antenna element formed of a rectangular parallelepiped space resonator disposed on the slot 14, the high frequency input from the antenna feed line 22 FIG. 4 is a diagram showing the frequency characteristic of the reflection coefficient with respect to the signal.

In FIG. 4, the horizontal axis represents the frequency (unit: GHz) of the high-frequency signal, the vertical axis represents the reflection coefficient (unit: dB), and the solid characteristic curve A represents the above-described antenna module of the present invention. The frequency characteristic of a reflection coefficient is shown. Further, a characteristic curve B indicated by a broken line shows a result of a comparative example in which the ground conductor 23 for suppressing reflection is not provided in the same configuration as the above-described antenna module of the present invention. As can be seen from the results, the reflection coefficient of the antenna module of the present invention is about −20 dB at a frequency of 76.5 GHz, and the reflection coefficient of the comparative example is about −16 dB at the same frequency.
Therefore, according to the antenna feed line and the antenna module of the present invention, the ground conductor 23 for suppressing reflection is used.
The effect of suppressing the reflection loss of the high-frequency signal due to the provision of is clearly shown. Also, the effect of suppressing the reflection loss is as follows.
Although the target frequency is 76.5 GHz, it becomes more remarkable as the frequency becomes higher due to the position of the ground conductor.

It should be noted that the present invention is not limited to the above-described embodiment, and various changes and improvements can be made without departing from the scope of the present invention. For example, a configuration may be employed in which a plurality of ground conductors having different dimensions are arranged.

[0040]

As described above in detail, according to the antenna feed line of the present invention, the upper main conductor layer formed on the upper surface of the dielectric substrate formed by laminating a plurality of dielectric layers, A lower main conductor layer formed below, and two rows of through conductor groups formed of a plurality of through conductors formed in the dielectric substrate and electrically connecting the upper main conductor layer and the lower main conductor layer at predetermined intervals, And a sub-conductor layer electrically connecting each through conductor group between the dielectric layers, and is surrounded by upper and lower surfaces by the upper main conductor layer and the lower main conductor layer and side surfaces by the through conductor group and the sub-conductor layer. A conductor-free portion is provided in an upper main conductor layer of a dielectric waveguide line for transmitting a high-frequency signal by a transmission region, and an antenna element disposed on the conductor-free region is connected to the antenna element via the conductor-free portion. Antenna for feeding high-frequency signals An upper or lower surface forming the E-plane of the dielectric waveguide line within a transmission region having a distance of 1/8 to 4/8 of the signal wavelength from the conductor-free portion to the input side of the high-frequency signal. At a position perpendicular to the signal transmission direction from the side surface and at a distance of 1/8 to 4/8 of the distance between the upper and lower surfaces or the side surfaces forming the E plane, the distance between the upper and lower surfaces forming the H surface or the distance between the side surfaces is 1
Since the ground conductor made of a conductor rod and / or a conductor layer having a length of / 8 to 6/8 is provided, the dielectric waveguide line is provided with a conductor non-forming region, which is a feeding slot. As a result, the impedance becomes discontinuous, and the electromagnetic wave of the high-frequency signal is reflected.On the other hand, the electromagnetic wave reflected by the slot is reflected again by the ground conductor to cancel each other, thereby reducing the reflection of the electromagnetic wave. In this frequency, reflection loss at the slot is suppressed, and highly efficient power supply to the antenna element can be performed.

Further, the antenna module of the present invention is arranged on the antenna feed line of the present invention having the above-described structure and on the upper main conductor layer of the antenna feed line, and is supplied with a high-frequency signal through a non-conductor-formed region. Equipped with an aperture antenna or a linear antenna, it is possible to feed the antenna element with high efficiency, and as a result, it can function as a microwave band or millimeter wave band antenna having good radiation characteristics. it can.

As described above, according to the present invention, with respect to an antenna feed line for feeding power to an antenna element via a slot provided in a dielectric waveguide line, reflection loss at the slot at a desired frequency is suppressed. Thus, an antenna feed line capable of feeding the antenna element with high efficiency could be provided.

Further, according to the present invention, it is possible to provide an antenna module having high radiation efficiency and good radiation characteristics, wherein the antenna element is electrically connected to the antenna feed line.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view for explaining an example of an embodiment of an antenna feed line and an antenna module of the present invention.

2 (a) and 2 (b) are cross-sectional views taken along line AA 'and BB' of the antenna feed line shown in FIG. 1, respectively, and FIG. 2 (c) is grounding in the antenna feed line of the present invention. It is sectional drawing similar to (b) which shows the other example of a conductor.

FIG. 3 is a schematic perspective view for explaining a specific example of an antenna feed line and an antenna module of the present invention.

FIG. 4 is a diagram showing frequency characteristics of reflection coefficients in specific examples and comparative examples of the antenna feed line and the antenna module of the present invention.

[Explanation of symbols]

1, 11, 18 ... Dielectric substrate 1a-1c, 11a-11c, 18a-18c ... Dielectric layer 2, 12 ... ..... Upper main conductor layer 3, 19 ... Lower main conductor layer 4, 14 ... Slot (Conductor non-formed part) 5, 16, 20: Through conductor group 6, 17, 21, ... Sub-conductor layer 7, 23 Ground conductor 13 Lower main conductor layer (upper main conductor layer) d・ ・ ・ ・ ・ ・ ・ ・ ・ Distance between slot and ground conductor w ・ ・ ・ ・ ・ ・ ・ ・ ・ Distance between E surface and ground conductor l ・ ・..... Length of ground conductor

Claims (2)

[Claims] An upper main conductor layer formed on an upper surface of a dielectric substrate formed by laminating a plurality of dielectric layers; a lower main conductor layer formed below the dielectric substrate; A plurality of penetrating conductor groups formed in the inner conductor and electrically connecting the upper main conductor layer and the lower main conductor layer at predetermined intervals, and each of the penetrating conductor groups is electrically connected between the dielectric layers. And a sub-conductor layer that is electrically connected to the upper and lower main conductor layers, and transmits a high-frequency signal through a transmission region surrounded by side surfaces of the through conductor group and the sub-conductor layer. An antenna feed for feeding the high-frequency signal to an antenna element disposed on the conductor non-formation region through the conductor non-formation portion, wherein the upper main conductor layer of the waveguide line is provided with a conductor non-formation portion. On the track, In the transmission region at a distance of 1/8 to 4/8 of the signal wavelength from the conductor non-formed portion to the input side of the high-frequency signal, the signal is transmitted from the upper and lower surfaces or side surfaces forming the E plane of the dielectric waveguide line. At a position perpendicular to the transmission direction and at a distance of 1/8 to 4/8 of the distance between the upper and lower surfaces or the side surfaces forming the E surface, the distance between the upper and lower surfaces or the side surfaces forming the H surface is set to one.
An antenna feed line provided with a grounding conductor having a length of / 8 to 6/8 and comprising a conductor bar and / or a conductor layer. 2. The antenna feed line according to claim 1, wherein the antenna feed line is disposed on the upper main conductor layer, and an aperture antenna or a linear antenna is supplied with a high-frequency signal through the non-conductor region. An antenna module comprising an antenna.