JP2001358529A - Antenna device and radio communication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce an antenna device 1 in thickness. SOLUTION: A recess 9 is provided on the top surface of a feed circuit board 8, and a feed circuit 10 is formed on the base of the recess 9. A dielectric base 2 is placed on the feed circuit board 8 with its base fit into the recess 9 of the board 8 so as to stop up the opening of the recess 9. A stopper means is provided inside the recess 9 so as to make the base of the dielectric base 2 located above the feed circuit 10 through the intermediary of a certain gap. A high-frequency cable connection land pattern 17 is formed in a region of the top surface of the feed circuit board 8 without the recess 9. Feed electrodes 5 are formed on the outer peripheral side 2c of the dielectric base 2 with some space from a radiating electrode 3. An electric power fed to the feed circuit electrode 5 from the feed circuit 5 through the intermediary of a feed wiring pattern is transmitted to the radiating electrode 3 from the feed circuit electrode 5 through capacitive coupling. The feed circuit 10 is housed in the recess 9 provided to the feed circuit board 8, so that an antenna device 1 can be restrained from increasing in height and reduced in thickness.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a DAB (Digital
The present invention relates to an antenna device used for Audio Broadcast (digital audio broadcasting system) and the like, and a wireless communication device using the same.

[0002]

2. Description of the Related Art FIG. 7 is a perspective view showing an example of an antenna device. This antenna device 30 is, for example,
It transmits and receives circularly polarized radio waves used for DAB and the like, and includes, for example, a circularly polarized antenna unit 31, a power supply circuit board 32, a power supply circuit (not shown), and a shield case 33. The circularly polarized antenna unit 31 has a dielectric substrate 35 and a radiation electrode 36.

That is, as shown in FIG. 7, a circular radiation antenna 36 is formed on the upper surface of a rectangular parallelepiped dielectric substrate 35 to constitute a circularly polarized antenna unit 31.
The circularly polarized antenna unit 31 is mounted on the dielectric substrate 3.
5 is provided on the upper surface of the power supply circuit board 32 with the bottom surface as a mounting surface. A power supply circuit for supplying power to the radiation electrode 36 is formed on the bottom surface of the power supply circuit board 32, and a plurality of power supply pins 37 for electrically connecting the power supply circuit and the radiation electrode 36 are connected to the power supply circuit board. 32 and the dielectric substrate 35. The power supply circuit board 3
A shield case 33 is provided on the bottom side of the cover 2 to cover the power supply circuit with an interval therebetween and shield the power supply circuit.

In the antenna device 30 shown in FIG. 7, a radiation electrode 36 is provided from the power supply circuit via the power supply pin 37.
Is supplied directly to the radiating electrode 36, and the radiating electrode 36 is excited by this power supply to transmit and receive a circularly polarized radio wave.

[0005]

In the antenna device 30 having the configuration shown in FIG. 7, as described above, the feed circuit board 32
The circularly polarized antenna unit 31 is disposed on the upper surface side of
On the bottom side of the power supply circuit board, a power supply circuit and a shield case 33 that covers the power supply circuit with an interval provided therebetween, and the antenna device 30 was bulky. In recent years, a reduction in size and thickness of an antenna device has been demanded, but it has been difficult to satisfy the demand.

Further, in the antenna device 30, since the feed pin 37 is disposed near the center of the dielectric substrate 35, the feed pin 37 and the feed circuit formed on the bottom surface of the feed circuit board 32 are connected. There is a problem that it is difficult to perform positioning for satisfactorily conducting connection. Further, since the power supply pin 37 is disposed near the center of the power supply circuit board 32, the output portion of the power supply circuit must be provided at the center of the circuit. Is not easy to design, and there is a problem that patterning of the power supply circuit is difficult.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide an antenna device which can promote miniaturization and thinning, and which is easy to design and manufacture, and an antenna device therefor. It is to provide a wireless communication device used.

[0008]

Means for Solving the Problems In order to achieve the above object, the present invention has the following structure to solve the above problems. That is, in the antenna device of the first invention, a radiation electrode for transmitting and receiving radio waves is formed on the upper surface of the dielectric substrate to form an antenna unit portion, and the antenna unit portion supplies power using the bottom surface of the dielectric substrate as a mounting surface. An antenna device mounted on a circuit board, wherein a concave portion is formed on an upper surface of the power supply circuit substrate, and a power supply circuit for supplying power to the radiation electrode is formed on a bottom surface of the concave portion, The dielectric substrate of the antenna unit is mounted on the feeder circuit board so as to cover the opening of the recess.

An antenna device according to a second aspect of the present invention has the structure of the first aspect, wherein a ground electrode is formed on the bottom surface of the dielectric substrate of the antenna unit, and formed on the bottom surface of the concave portion of the feeder circuit board. The feeding circuit is shielded by the ground electrode of the dielectric substrate.

An antenna device according to a third aspect of the present invention has the structure of the first or second aspect, wherein the dielectric base of the antenna unit is substantially cylindrical and formed on the upper surface of the dielectric base. The radiation electrode is configured to transmit and receive circularly polarized radio waves, and a power supply electrode that is conductively connected to a power supply circuit is formed on the outer peripheral side surface of the dielectric substrate with an interval from the radiation electrode. The power output from the circuit is configured to be supplied to the radiation electrode by capacitive coupling via the power supply electrode.

An antenna device according to a fourth aspect of the present invention includes the configuration of the first, second, or third aspect of the present invention, wherein the bottom surface side of the dielectric base of the antenna unit is inserted and inserted into the recess of the feeder circuit board. The opening of the concave portion is closed, and the bottom surface of the dielectric substrate is arranged above the power supply circuit with a space therebetween by stopper means provided in the concave portion. .

The antenna device according to a fifth aspect of the present invention is the antenna device according to the first to fifth aspects.
The power supply circuit board according to any one of the fourth aspects of the present invention, wherein a land pattern for connecting a high-frequency cable is formed on an upper surface of the power supply circuit board in a region other than the recessed portion to be electrically connected to the power supply circuit. Have been.

[0013] A wireless communication apparatus according to a sixth aspect of the present invention is the wireless communication apparatus according to the first to fourth aspects.
The antenna device according to any one of the fifth inventions is provided.

In the invention having the above structure, a concave portion is formed on the upper surface of the power supply circuit board, and a power supply circuit is formed on the bottom surface of the concave portion. That is, the power supply circuit is configured to be housed in the concave portion of the power supply circuit board. This power supply circuit is shielded by, for example, a ground electrode on the bottom surface of the dielectric substrate of the antenna unit.

With this configuration, the feeder circuit and its shield means need not be provided on the bottom side of the feeder circuit board, so that the antenna device can be made thinner.

The dielectric substrate of the antenna unit has a substantially columnar shape, and the radiation electrode is configured to transmit and receive circularly polarized radio waves. Power is supplied to the radiation electrode from a power supply electrode by capacitive coupling. In the invention having the configuration described above, the power supply electrode is formed on the outer peripheral side surface of the dielectric substrate of the antenna unit portion, and the power supply circuit is formed on the concave bottom surface of the upper surface of the power supply circuit board as described above. It is easy to electrically connect the power supply electrode and the power supply circuit, and problems such as poor connection can be prevented. Further, the output portion of the power supply circuit is located at the end of the circuit, and thus the design of such a power supply circuit is easy, and the patterning of the power supply circuit can be easily performed.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1A schematically shows a perspective view of the antenna device of the first embodiment, and FIG. 1B shows an AA portion of the antenna device shown in FIG. 1A. 2 is shown, and FIG. 2 shows the antenna unit constituting the antenna device of FIG. 1A in an expanded state.

The antenna device 1 according to the first embodiment transmits and receives circularly polarized radio waves used for DAB and the like. As shown in FIGS. 1 (a) and 1 (b),
It has a form in which a cylindrical dielectric substrate 2 is mounted on the upper surface of the power supply circuit board 8.

The dielectric substrate 2 is made of a dielectric material such as ceramics.
In a, a circular radiation electrode 3 is disposed with its center positioned on the central axis of the dielectric substrate 2.

A feed electrode 5 (5A, 5A ', 5B, 5B') is formed on the outer peripheral side surface 2c of the dielectric substrate 2 with an interval from the radiation electrode 3. In the first embodiment, the power supply electrode 5A and the power supply electrode 5A '
The power supply electrode 5B and the power supply electrode 5B 'are also disposed opposite each other via the central axis of the dielectric substrate 2, and the power supply electrode 5B (5A') To the central axis of the power supply electrode 5B '
The angle θ between (5B) and the direction toward the central axis of the dielectric substrate 2 is substantially 45 °.

Further, a ground electrode 6 is formed on the bottom surface 2b of the dielectric substrate 2 except for a non-ground region S described later.

In the first embodiment, the antenna unit 7 is composed of the dielectric substrate 2, the radiation electrode 3, the feed electrode 5, and the ground electrode 6.

Further, in the first embodiment, the power supply circuit board 8 is made of a dielectric material such as ceramics, and as shown in FIG. A ground electrode 20 is formed on the upper surface of the power supply circuit board 8, and a concave portion 9 is formed on the upper surface of the power supply circuit board 8. The recess 9 has a size such that the bottom surface side of the dielectric substrate 2 of the antenna unit 7 is fitted and inserted. A plurality of land patterns 16 for soldering are provided at the edge of the opening of the concave portion 9 in accordance with the position where the power supply electrode 5 is formed on the dielectric substrate 2.

The dielectric substrate 2 of the antenna unit 7
The bottom surface of the power supply electrode 5 is fitted and inserted into the inside of the concave portion 9 to close the opening of the concave portion 9, and the position of the power supply electrode 5 is aligned with the corresponding land pattern 16. The body substrate 2 is fixed to the power supply circuit board 8 by using the land pattern 16 by soldering.

A power supply circuit 10 to be described later is formed on the bottom surface of the concave portion 9 so that the power supply circuit 10 does not come into contact with the bottom surface of the dielectric base 2 fitted and inserted into the concave portion 9. Inside the concave portion 9, a stopper means (not shown) for arranging the bottom surface of the dielectric substrate 2 above the power supply circuit 10 with an interval therebetween is provided.

The power supply circuit 1 formed on the bottom of the recess 9
Reference numeral 0 denotes a circuit for supplying power to each of the power supply electrodes 5, and has a circuit configuration as shown in FIG. 3A, for example. FIG.
FIG. 3B shows a pattern example of the power supply circuit 10 shown in FIG. FIG. 3B is a diagram of the power supply circuit board 8 in a state where the antenna unit 7 is not mounted, as viewed from above.

The power supply circuit 10 shown in FIGS. 3A and 3B includes a 0 ° hybrid 12 and a 90 ° hybrid 1
3 and 14. A plurality of power supply wiring patterns 11 drawn from such a power supply circuit 10 are formed on the inner peripheral surface of the concave portion 9, and the leading ends of the respective power supply wiring patterns 11 are electrically connected to the corresponding land patterns 16. Have been. In the state where the feed electrode 5 of the dielectric base 2 of the antenna unit 7 and the land pattern 16 are aligned as described above, the dielectric base 2 is fitted and inserted into the recess 9 and the feed circuit board is formed. 8
The power supply circuit 1 is fixed to the
Numeral 0 is electrically connected to the power supply electrode 5 via the power supply wiring pattern 11 and the land pattern 16. In addition, FIG.
Indicates a resistance element (chip resistance element).

As described above, when the dielectric substrate 2 is fixed to the power supply circuit board 8 by soldering, the power supply wiring pattern 1
In order to reliably insulate the wiring pattern 1 and a wiring pattern 18 to be described later from the ground electrode 6 on the bottom surface of the dielectric substrate 2, the bottom surface of the dielectric substrate 2 may come into contact with the power supply wiring patterns 11 and the wiring patterns 18. There is a non-ground area S
And

In the first embodiment, FIG.
As shown in FIG. 3B and FIG.
A land pattern 17 for connecting a high-frequency cable is formed in a region avoiding the concave portion 9 on the upper surface of the substrate. The land pattern 17 for connecting a high-frequency cable is connected to the power supply circuit 10.
And a high-frequency cable (not shown) for connecting to the external circuit by a connection means such as solder.
Are electrically connected to the power supply circuit 10 via a wiring pattern 18 formed on the inner peripheral surface of the power supply circuit 10.

The power supply circuit 1 shown in FIGS. 3A and 3B
0, the high-frequency cable connection land pattern 17
A high-frequency cable is connected to the power supply circuit 15 shown in FIG. 3A via the high-frequency cable.
When power is supplied from the power supply source 15 to the 0 ° hybrid 12 in a state where the connection is electrically connected to 0,
The hybrid 12 divides the supplied power into two without changing the phase, and supplies the two to the 90 ° hybrids 13 and 14, respectively. 90 ° hybrid 13,
In 14, the supplied power is divided into two signals whose phases are different from each other by 90 ° and supplied to the power supply electrode 5 via the power supply wiring pattern 11. The pair of the power supply electrode 5A and the power supply electrode 5A 'and the power supply electrode 5B and the power supply electrode 5B' are supplied with the same phase of power, respectively, so that the power supply electrode 5A and the power supply electrode 5B (the power supply electrode 5A 'and the power supply electrode 5A'). 5
B ′) are supplied with powers that are 90 ° out of phase with each other.

In the first embodiment, the power supply circuit 10 is formed by the ground electrode 6 formed on the bottom surface of the dielectric substrate 2 and the ground electrode 20 formed on the bottom surface of the power supply circuit board 8. Shield means for shielding is configured.

The antenna device 1 shown in the first embodiment
Is configured as described above. When power is supplied to each power supply electrode 5 from the power supply circuit 10 via the power supply wiring pattern 11 as described above, the power is supplied to each power supply electrode 5.
Is supplied to the radiation electrode 3 by capacitive coupling, and the radiation electrode 3 resonates by this power supply. As described above, in the first embodiment, the power supply electrode 5A (5A ')
From the power supply electrode 5 to the central axis of the dielectric substrate 2.
Since the angle between B ′ (5B) and the direction toward the central axis of the dielectric substrate 2 is substantially 45 °, the radiation electrode 3 has a resonance frequency of a plurality of preset resonance modes. Resonates in the higher resonance mode (ie, higher mode). As a result, the radiation electrode 3 transmits and receives high-order mode circularly polarized radio waves.

In the first embodiment, as described above,
A concave portion 9 is formed on the upper surface of the power supply circuit board 8, and a power supply circuit 10 is formed on the bottom surface of the concave portion 9.
It was configured to be housed and arranged inside the. In addition, a ground electrode 6 is formed on the bottom surface of the dielectric substrate 2 that closes the opening of the recess 9, and the power supply circuit 10 is shielded by the ground electrode 6.

Conventionally, as shown in FIG. 7, the circularly polarized antenna unit 31 is mounted on the upper surface of the power supply circuit board 32, and the power supply circuit and the shield case 33 are formed on the bottom side of the power supply circuit board 32. And the antenna device 30
Had become bulky. On the other hand, in the first embodiment, as described above, the recess 9 on the upper surface of the feeder circuit board 8 is used.
The power supply circuit 10 is accommodated therein, and the ground electrode 6 on the bottom surface of the dielectric substrate 2 that covers the opening of the concave portion 9 functions as a shield means of the power supply circuit 10. The feeder circuit 10 and the shield case do not need to be formed, so that the feeder circuit 10 and the shield case need not be provided on the bottom surface of the feeder circuit board 8, so that the antenna device 1 is significantly thinner (smaller). can do.

In the first embodiment, the power is supplied from the power supply electrode 5 to the radiation electrode 3 by capacitive coupling, and the power supply electrode 5 is formed on the outer peripheral side surface 2 c of the dielectric substrate 2. Therefore, the output section of the power supply circuit 10 can be arranged at the end of the power supply circuit 10, and it is easy to configure such a circuit. Therefore, the patterning of the power supply circuit 10 can be easily performed. it can.

Further, as described above, the power supply electrode 5 is formed on the outer peripheral side surface 2 c of the dielectric substrate 2, and the power supply wiring pattern 11 electrically connected to the power supply circuit 10 is formed in the recess 9 on the upper surface of the power supply circuit board 8. Therefore, the power supply electrode 5 and the power supply wiring pattern 11 are accurately aligned, and the dielectric substrate 2
Can be mounted on the power supply circuit board 8,
The power supply electrode 5 and the power supply circuit 10 can be reliably conductively connected, and problems such as poor conduction can be prevented.

Further, in the first embodiment, the land pattern 17 for connecting the high-frequency cable is formed in a region avoiding the concave portion 9 on the upper surface of the power supply circuit board 8, that is, in a portion where the thickness of the board is large. The high-frequency cable connection land pattern 17 can be formed large without concern for impedance mismatch with a circuit,
A high-frequency cable can be firmly connected to the land pattern 17.

That is, in order to reduce the size of the antenna device 1, for example, when the feed circuit 10 is to be formed finely, it is necessary to increase the dielectric constant of the feed circuit substrate 8. As the dielectric constant of the power supply circuit board 8 increases, the impedance of the large high-frequency cable connection land pattern 17 increases considerably, so that impedance mismatch with an external circuit is likely to occur. In order to prevent the impedance mismatch, it is difficult to increase the size of the high-frequency cable connection land pattern 17.

On the other hand, in the first embodiment,
Since the high-frequency cable connection land pattern 17 is formed in a region where the thickness of the power supply circuit board 8 is large, the impedance of the high-frequency cable connection land pattern 17 is reduced by the thickness of the substrate. This allows the high-frequency cable connection land pattern 17 to be formed large without concern for impedance mismatch. Since the large land pattern 17 for connecting a high-frequency cable can be formed as described above, the connection with the high-frequency cable can be firmly performed. For example, it is possible to prevent a problem that the high-frequency cable is disconnected due to an external impact. Thus, the mechanical reliability of the antenna device 1 can be improved.

Further, as described above, the permittivity of the feeder circuit board 8 tends to increase due to the downsizing of the antenna device 1, but as the permittivity of the feeder circuit board 8 increases,
Since the phase change of the wiring pattern becomes large, the power supply electrode 5
And the power supply wiring pattern 11 are required to be connected with high positional accuracy as designed. In the first embodiment, since the bottom surface of the dielectric substrate 2 is fitted and inserted into the recess 9, the positioning when the antenna unit 7 is mounted on the power supply circuit board 8 becomes easy, and the power supply electrode 5 And the power supply wiring pattern 11 can be connected as designed with high positional accuracy.

Further, if the entire power supply circuit board 8 is made thin, there is a problem that the power supply circuit board 8 is easily damaged when subjected to a stress from the high-frequency cable or a drop or the like, but in the first embodiment, The thickness of the portion of the power supply circuit board 8 where the concave portion 9 is formed is small, but the thickness of the substrate is thick in the other portions. It is possible to prevent the property from being lowered.

Hereinafter, a second embodiment will be described. In the second embodiment, an example of a wireless communication device according to the present invention will be described. FIG. 4 is a block diagram showing a main configuration example of the wireless communication apparatus according to the second embodiment. The wireless communication device according to the second embodiment is a communication device using DAB, and the feature of this wireless communication device is that the antenna device 1 according to the first embodiment is provided. is there. In the second embodiment, since the configuration of the antenna device 1 has been described in the first embodiment, a duplicate description thereof will be omitted.

As shown in FIG. 4, this radio communication device
The antenna device 1 shown in the first embodiment, the receiving unit 22, the signal processing unit 23, and the interface unit 24
And a display unit 25. In such a wireless communication device, for example, a radio signal received by the antenna device 1 is added to the receiving unit 22. The receiving unit 22 extracts predetermined various signals from the added radio signal and outputs the signals to the signal processing unit 23. The signal processing unit 23 performs signal processing on the received signal according to a predetermined method, and performs display control and the like on the display 25 in cooperation with an interface unit 24 such as a remote controller.

According to the second embodiment, since the wireless communication device is configured using the antenna device 1 shown in the first embodiment, the wireless communication device can be reduced in size and thickness. .

It should be noted that the present invention is not limited to the above embodiments, and various embodiments can be adopted. For example, in each of the above embodiments, the bottom surface of the dielectric substrate 2 of the antenna unit 7 is fitted and inserted into the recess 9 of the feeder circuit board 8. Is formed larger than the opening of the recess 9, and the dielectric substrate 2 may be disposed so as to cover the opening of the recess 9, and may be configured to cover the opening of the recess 9.

In each of the above embodiments, the antenna device 1 transmits and receives a circularly polarized radio wave. For example, the present invention is also applicable to an antenna device that transmits and receives a linearly polarized radio wave. Can be applied. In the case of the antenna device for transmitting and receiving the linearly polarized radio wave, the dielectric substrate 2
Has, for example, a rectangular parallelepiped shape, and the radiation electrode 3 has, for example, a band shape or a meander shape. As described above, the shapes of the dielectric substrate 2 and the radiation electrode 3 are shapes based on various factors such as required types of transmission / reception radio waves.

Further, in the case of a circularly polarized antenna device, the dielectric substrate 2 is not limited to a columnar shape, and the dielectric substrate 2 may have a substantially cylindrical shape. The shape may be a polygonal column or the like such as a column. Further, the radiation electrode 3 for circular polarization is not limited to a circular shape, but may be a substantially circular shape, and may be, for example, an elliptical shape or a polygonal shape such as a octagon. However, it is desirable that the distance between the outer edge of the radiation electrode 3 and the outer edge of the contour of the dielectric substrate 2 is substantially equal over the entire circumference of the outer edge of the dielectric substrate 2.

Further, in each of the above embodiments, the outer peripheral side surface 2c of the dielectric substrate 2 is a curved surface all around, but the power supply electrode forming region on the outer peripheral side surface of the dielectric substrate 2 may be a flat surface. . In this case, it is easy to form the power supply electrode 5 using a film forming technique such as printing.

Further, in each of the above embodiments, the arrangement position of each power supply electrode 5 is defined so that the radiation electrode 3 operates in a higher-order mode having a higher resonance frequency among the set resonance modes. For example, the arrangement position of each feed electrode 5 may be set so that the radiation electrode 3 resonates in the fundamental mode having the lowest resonance frequency among the set resonance modes. That is, for example, as shown in FIG. 5A, the power supply electrodes 5A and 5B are provided on the outer peripheral side surface 2c of the dielectric substrate 2.
And the power supply electrodes 5A and 5B are connected to the power supply electrode 5A.
From the power supply electrode 5 to the central axis of the dielectric substrate 2.
They may be arranged such that the angle α between B and the direction toward the central axis of the dielectric substrate 2 is 90 °. In this case, the power supply electrode 5A and the power supply electrode 5B are supplied with power having phases different from each other by 90 °.
A power supply circuit 10 and a power supply wiring pattern 11 are formed.

In order that the radiation electrode 3 can resonate in both the fundamental mode and the higher-order mode,
The arrangement position of each power supply electrode 5 may be set. In this case, for example, as shown in FIG. 5B, each power supply electrode 5 is arranged. That is, in the example shown in FIG. 5B, the power supply electrode 5 for the basic mode is provided on the outer peripheral side surface 2c of the dielectric substrate 2.
A, 5B and power supply electrodes 5C, 5D for the higher mode are formed. The angle α formed between the direction from the power supply electrode 5A toward the central axis of the dielectric substrate 2 and the direction from the power supply electrode 5B toward the central axis of the dielectric substrate 2 is 90 °. The angle β formed between the direction toward the center axis of the body 2 and the direction from the power supply electrode 5D toward the center axis of the dielectric body 2 is 45 °. With this configuration, the radiation electrode 3 can transmit and receive circularly polarized radio waves in two different frequency bands. In this case, the power supply electrodes 5A and 5B have a phase of 9 with each other.
The power for the basic mode, which differs by 0 °, is supplied, and the power for the higher-order mode, whose phases differ from each other by 90 °, is supplied to the power supply electrodes 5C, 5D.

In each of the above embodiments, the radiation electrode 3 is resonated by two-point power supply. However, for example, as shown in FIG. 6, the radiation electrode 3 may be resonated by one point power supply. Good. In this case, as shown in FIG. 6, the radiation electrode 3 is formed in a degenerate and separated form.

Further, in the second embodiment, an example is shown in which the antenna device 1 shown in the first embodiment is incorporated in a wireless communication device using DAB, but the antenna device of the present invention is other than DAB. Can be mounted on the wireless communication device.

[0054]

According to the present invention, a concave portion is formed on the upper surface of the power supply circuit board, a power supply circuit is formed on the bottom surface of the concave portion, and the power supply circuit is accommodated and arranged inside the concave portion. Since the feeder circuit and the shield case need not be provided on the bottom side of the feeder circuit board, the bulkiness of the antenna device can be suppressed, and the antenna device can be made thinner.

In the invention in which a ground electrode is formed on the bottom surface of the dielectric substrate and the power supply circuit on the bottom surface of the concave portion is shielded by the ground electrode, the shielding means for shielding the power supply circuit is provided. Need not be provided.

Since power is supplied from the power supply electrode to the radiation electrode by capacitive coupling, and the power supply electrode is formed on the outer peripheral side surface of the dielectric substrate, the power supply circuit formed on the upper surface side of the power supply circuit board and the power supply circuit It is easy to make a conductive connection between the power supply electrode and the power supply electrode, and it is possible to prevent a problem such as poor conduction between the power supply electrode and the power supply circuit. Further, the output of the power supply circuit can be formed at the end of the circuit, so that the patterning of the power supply circuit is simplified.

In a configuration in which the bottom side of the dielectric substrate is fitted and inserted into the recess of the power supply circuit board to close the opening of the recess, the dielectric substrate is mounted on the power supply circuit board with high positional accuracy. Accordingly, it is possible to prevent a phase shift due to a mounting position shift.

In the case where a land pattern for connecting a high-frequency cable is formed on the upper surface of the power supply circuit board in a region avoiding the concave portion, the land pattern for connecting the high-frequency cable is formed in a portion where the thickness of the substrate is large avoiding the concave portion. Since the high-frequency cable connection land pattern is provided, depending on the thickness of the substrate,
The increase in the impedance of the high-frequency cable connection land pattern can be mitigated, so that the high-frequency cable connection land pattern can be formed large without worrying about the problem of impedance mismatch with an external circuit. As described above, since a large high-frequency cable connection land pattern can be formed, the high-frequency cable can be firmly connected using the high-frequency cable connection land pattern, and the mechanical reliability of the antenna device can be improved. It is possible to increase.

According to the present invention, in a wireless communication device equipped with an antenna device having a specific configuration, the thickness of the wireless communication device can be reduced as the antenna device becomes thinner.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an embodiment of an antenna device according to the present invention.

FIG. 2 is an explanatory diagram showing an antenna unit constituting the antenna device shown in FIG. 1;

FIG. 3 is an explanatory diagram illustrating an example of a power supply circuit provided in the antenna device illustrated in FIG. 1;

FIG. 4 is a block diagram illustrating an example of a wireless communication device according to the present invention.

FIG. 5 is an explanatory diagram showing another embodiment.

FIG. 6 is an explanatory view showing still another embodiment.

FIG. 7 is an explanatory diagram showing an example of a conventional circularly polarized antenna device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Antenna device 2 Dielectric substrate 3 Radiation electrode 5 Feeding electrode 6 Ground electrode 7 Antenna unit part 8 Feeding circuit board 9 Depression 10 Feeding circuit 17 Land pattern for high frequency cable connection

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Tsune Akiyama 2-26-10 Tenjin, Nagaokakyo-shi, Kyoto Stock Company Murata Manufacturing Co., Ltd. (72) Inventor Kazuya Kawabata 2-26-10 Tenjin, Nagaokakyo-city, Kyoto Stock 5J045 AA01 AA05 AB02 AB05 AB06 CA04 DA10 EA07 FA09 GA02 HA03 JA04 JA12 LA03 MA07 NA08 5J046 AA03 AA06 AA07 AA19 AB13 PA07 5K011 AA06 AA15 AA16 JA01 JA03 KA00

Claims (6)

[Claims] A radiation electrode for transmitting and receiving radio waves is formed on an upper surface of a dielectric substrate to form an antenna unit. The antenna unit is mounted on a feeder circuit board with the bottom surface of the dielectric substrate as a mounting surface. A concave portion is formed on an upper surface of the power supply circuit board, and a power supply circuit for supplying power to the radiation electrode is formed on a bottom surface of the concave portion. An antenna device, wherein a body substrate is mounted on a feeder circuit board in a form to close an opening of the concave portion. 2. A ground electrode is formed on the bottom surface of the dielectric substrate of the antenna unit, and the power supply circuit formed on the bottom surface of the concave portion of the power supply circuit board is shielded by the ground electrode of the dielectric substrate. The antenna device according to claim 1, wherein: 3. The dielectric substrate of the antenna unit has a substantially cylindrical shape, and a radiation electrode formed on an upper surface of the dielectric substrate transmits and receives circularly polarized radio waves. A power supply electrode electrically connected to a power supply circuit is formed on the outer peripheral side surface of the base with an interval from the radiation electrode, and power output from the power supply circuit is supplied to the radiation electrode by capacitive coupling via the power supply electrode. The antenna device according to claim 1, wherein the antenna device is configured to perform the following. 4. The antenna unit has a configuration in which the bottom side of the dielectric substrate is fitted and inserted into the concave portion of the feeder circuit board to close the opening of the concave portion, and the bottom surface of the dielectric substrate is provided in the concave portion. 2. The power supply circuit according to claim 1, wherein the power supply circuit is disposed above the power supply circuit with a gap therebetween.
An antenna device according to claim 2 or claim 3. 5. A high-frequency cable connection land pattern electrically connected to the power supply circuit is formed in a region avoiding the recess on the upper surface of the power supply circuit board.
The antenna device according to claim 1. 6. A wireless communication device comprising the antenna device according to claim 1. Description: