JP2002016430A - Antenna, electronic equipment mounted with the same and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a miniaturized antenna which can be surface-mounted and reduce the probability of damage. SOLUTION: A first substrate 2 is provided with a radiation electrode on a principal face 2a of the first substrate 2, and a second substrate 3 is respectively provided with a feeding electrode and a ground electrode on principal faces 3a and 3b and further provided with a side face electrode which is bonded with the feeding electrode and is not connected with the ground electrode on the side face 3c. The first and second substrates 2 and 3 are mutually bonded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to wireless data communication,
The present invention relates to an antenna used for satellite communication and the like, an electronic device equipped with the antenna, and a method of manufacturing the antenna.

[0002]

2. Description of the Related Art In recent years, it has been studied to collect tolls on expressways and toll roads by wireless data communication between a roadside unit provided at a tollgate and a vehicle-mounted unit installed in a car. In such a system, it is not necessary to stop the vehicle at a toll gate, so that traffic congestion is expected to be reduced.

Conventionally, antennas for on-vehicle devices used in such systems include car navigation and VI.
A patch antenna that supplies power by a power supply pin that is widely used for receiving CS and a stacked type surface mount antenna are conceivable.

[0004]

However, a patch antenna that supplies power by a power supply pin has problems such as high mounting cost because automatic mounting cannot be performed, and difficulty in handling because the power supply pin is exposed outside the substrate. .

[0005] A multilayer antenna for surface mounting has also been proposed. However, this multilayer antenna has excessive production facilities, is expensive to manufacture, and is fired with electrodes sandwiched between ceramic substrates. Extremely severe, extremely high process failure rate. Further, there has been a problem that it is very difficult to adjust the characteristics when the characteristics of the antenna completed by firing deviate from the standard.

The present invention solves the above-mentioned conventional problems, and provides an antenna which has no power supply pins, can be automatically mounted, is easy to manufacture, has a high yield, and can easily adjust the characteristics of the antenna. The purpose is to:

[0007]

SUMMARY OF THE INVENTION According to the present invention, there is provided a power supply electrode provided between a radiation electrode and a ground electrode provided at a distance therefrom, and electrically connected to the power supply electrode to supply power to the power supply electrode. And a side electrode that is electrically connected to the power supply electrode and the power supply unit and that is provided in non-contact with the ground electrode, between the radiation electrode and the power supply electrode and between the power supply electrode and the ground electrode. Is provided with a dielectric material.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 is characterized in that a radiation electrode, a ground electrode provided separately from the radiation electrode,
A power supply electrode provided between the radiation electrode and the ground electrode, a power supply unit electrically connected to the power supply electrode and supplying power to the power supply electrode, and electrically connecting the power supply electrode and the power supply unit. And a side electrode provided in non-contact with the ground electrode, and a dielectric material provided between the radiation electrode and the feed electrode and between the feed electrode and the ground electrode. Since the power can be supplied from the side of the antenna, the mounting state can be checked from the side of the antenna, and since there is no protrusion such as a power supply pin, an antenna which can be surface-mounted and has high productivity can be provided.

According to a second aspect of the present invention, a first substrate having a radiation electrode formed thereon, and a ground electrode and a power supply portion provided in non-contact with the ground electrode are formed on the first main surface. A power supply electrode is formed on the second main surface, and a second substrate is formed on the first side surface, on which a side electrode connecting the power supply unit and the power supply electrode is formed. In addition, it is possible to adjust the electrodes, etc., so that variations in antenna characteristics can be reduced, and expensive equipment such as an integrated fired product by lamination is not required, and a conventional power supply patch using power supply pins Since the antenna can be manufactured by the same method as the antenna, an inexpensive antenna can be stably supplied.

According to a third aspect of the present invention, a first substrate having a radiation electrode formed on a first main surface and a first power supply electrode formed on a second main surface; An earth electrode and a power supply unit provided in electrical non-contact with the ground electrode are formed, a second power supply electrode is formed on a second main surface, and the power supply unit and the power supply electrode are formed on a first side surface. Is provided with the second substrate on which the side electrode for connecting the power supply electrode is formed, so that the power supply electrode formed on the first substrate and the power supply electrode formed on the second substrate can be joined via the electrode material. Therefore, bonding between the first substrate and the second substrate can be made sufficiently strong, and reliability can be improved.

According to a fourth aspect of the present invention, the position of the first substrate and the position of the second substrate are somewhat reduced by making the area of the power supply electrode of the first substrate smaller than the area of the power supply electrode of the second substrate. Even if it deviates, variation in antenna characteristics can be suppressed.

According to a fifth aspect of the present invention, since the thickness of the first substrate is larger than the thickness of the second substrate, it is possible to widen the adjustment range of the input impedance at the end of the power supply electrode. It is possible to supply a large amount of antennas with stable characteristics with little variation in impedance at low cost.

According to the present invention, the area of the main surface of the first substrate is equal to the area of the main surface of the second substrate or the area of the main surface of the second substrate is larger. It is possible to reduce the volume and improve the space utilization efficiency without lowering the antenna characteristics. Further, it is possible to minimize a change in characteristics due to a displacement of the mounting position between the first substrate and the second substrate.

According to a seventh aspect of the present invention, the area of the main surface of the first substrate is equal to the area of the main surface of the second substrate or the area of the main surface of the second substrate is smaller. Since the mounting area on the substrate on which the antenna is installed can be reduced, resistance to thermal shock and the like is increased, and reliability can be improved. Also, the space utilization efficiency can be improved.

According to the eighth aspect of the present invention, by joining the first substrate and the second substrate, an antenna having a wide adjustment range and high productivity can be obtained.

According to a ninth aspect of the present invention, the first substrate and the second substrate
By using at least one of a glass and a resin bonding material as a bonding material for bonding to the substrate, bonding between the substrates can be properly performed.

According to a tenth aspect of the present invention, the gap between the first substrate and the second substrate is set to 1 μm to 200 μm, so that there is almost no peeling during use, impedance matching can be accurately obtained, and reliability can be improved. It is possible to stably supply a small antenna with high performance.

According to the eleventh aspect, in the first aspect, by setting the relative dielectric constant εr of the substrate to 6 or more and 150 or less, it is possible to promote the miniaturization of the antenna and widen the resonance frequency band. Further, variation in characteristics can be suppressed.

According to the twelfth aspect of the present invention, by setting the surface roughness of the substrate to 10 μm or less, a decrease in the Q value can be prevented, and the gain of the antenna can be improved.

According to a thirteenth aspect of the present invention, in the first to fourth aspects, the substrate is made of ceramic and the sintering density is set to 92% or more, whereby the mechanical strength can be improved and the workability and the like can be improved. In addition, stable characteristics can be obtained, and a decrease in Q value and a decrease in relative dielectric constant can be prevented.

According to a fourteenth aspect of the present invention, in the first to fifth aspects, by performing at least one of chamfering and tapering on the corner of the substrate, a large chip of the corner of the substrate can be prevented. Thus, the characteristics of the antenna are largely changed, and no problem occurs.

According to a fifteenth aspect of the present invention, in the sixth aspect, the C-chamfering is adopted as the chamfering and the R of the C-chamfering is set to 0.1 mm or more, so that the antenna can be produced reliably and with high productivity. can do.

The invention according to claim 16, wherein a cutout portion is provided in the ground electrode, a joint portion provided in non-contact with the ground electrode is provided in the cutout portion, and the joint portion, the side electrode, and the power supply electrode are provided. By joining, it can be used as a surface mount component, and can be reliably joined with a power supply wiring provided on a circuit board or the like.

According to a seventeenth aspect of the present invention, the electrode material is gold,
By using a material having a resistivity of 1 × 10 ⁻⁴ Ωcm or less, such as silver, copper, or palladium, the conductor loss of the electrode can be reduced, so that a decrease in gain can be prevented. Further, by setting the electrode film thickness to 0.01 μm to 50 μm, an electrode that is difficult to peel off can be provided at low cost without deteriorating antenna characteristics.

According to the eighteenth aspect of the present invention, the degree of freedom of the antenna shape can be improved by making the dielectric constant of the first substrate different from that of the second substrate.

[0027] The invention described in claim 19 is the invention according to claims 1-1.
8; an antenna according to any one of (1) to (8); receiving means for demodulating a received signal received by the antenna to generate a data signal; first storage means in which predetermined information is stored in advance; A second storage unit that performs transmission, a transmission unit that modulates a data signal from the first and second storage units to generate a transmission signal, and a control unit that controls reception, demodulation, modulation, and transmission of the data. With this arrangement, the limitation on the location of the mounting machine is reduced, so that the layout of the apparatus can be easily performed and the data communication can be reliably performed. Further, since the antenna has extremely high durability, the installation conditions of the mounting machine are wide. Furthermore, since the antenna does not protrude significantly outside, problems such as breakage are less likely to occur.

According to a twentieth aspect of the present invention, there is provided a data communication system for transmitting and receiving information between an on-board machine mounted on a mobile body and a fixed machine installed on the ground, wherein the on-board machine is 19. An antenna according to any one of claims 1 to 18, a receiving unit for demodulating a signal from the fixed device received by the antenna to generate a data signal, and a first unit in which predetermined information is stored in advance. Storage means, second storage means for storing the data signal, and transmission for modulating data signals from the first and second storage means to generate a transmission signal transmitted from the antenna to the fixed machine Means, and control means for controlling the demodulation and modulation of the data and the transmission and reception of the signal, the antenna receives a predetermined signal, modulates the received signal by the receiving means to generate a data signal, Data signal If the data signal is to transmit the data stored in the storage unit, the control unit converts the data stored in the storage unit to a transmission signal to the outside via the transmission unit and the antenna. By transmitting the information, the mounting machine does not take up an installation place, and the size of the apparatus can be reduced, and the area where transmission and reception can be performed can be expanded. In addition, since the antenna has extremely high durability, the performance of the device can be made to function sufficiently even when the device or the like is arranged in a poor environment. Furthermore, since the antenna does not protrude greatly outside, there is no problem such as breakage. Therefore, data exchange with the fixed machine can always be performed well.

According to a twenty-first aspect of the present invention, there is provided a data communication system for transmitting and receiving information between a vehicle-mounted device mounted on a vehicle and a road-side device installed on the ground, wherein the vehicle-mounted device comprises: An antenna according to any one of claims 1 to 18,
Receiving means for demodulating a received signal received by the antenna to generate a data signal, first storage means in which predetermined information is stored in advance, second storage means for storing the data signal, Transmitting means for modulating a data signal from the first and second storage means to generate a transmission signal; and control means for controlling demodulation / modulation of the data and transmission / reception of the signal, wherein the antenna has a predetermined signal. Receiving, the received signal is modulated by the receiving means to generate a data signal,
When the data signal is a data signal to transmit data stored in the storage unit, the control unit transmits the data stored in the storage unit to the outside via the transmission unit and the antenna. By transmitting the signal as a transmission signal, the on-vehicle device does not take up an installation place, the device can be downsized, and the area in which transmission and reception can be performed can be expanded. In addition, since the antenna has extremely high durability, the performance of the device can be made to function sufficiently even when the device is disposed in a poor environment such as a vehicle. Furthermore, since the antenna does not protrude greatly outside, there is no problem such as breakage. Therefore, data exchange with the on-road device can always be performed well.

According to a twenty-second aspect of the present invention, a first molded body is formed from a predetermined material, and the first molded body is fired to form a first fired body. Forming a first substrate by quenching after forming a radiation electrode of a predetermined shape, forming a second molded body from a predetermined material,
The second formed body is fired to form a second fired body, and the second fired body is formed with at least a radiation electrode and a ground electrode having a predetermined shape and then quenched to form a second fired body.
Forming a substrate, and bonding the first substrate and the second substrate via a bonding material, thereby easily producing an antenna excellent in mountability. can do.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1) FIGS. 1, 2 and 3 are a front perspective view, a rear perspective view and a perspective view showing an antenna according to Embodiment 1 of the present invention, respectively. 5A and FIG. 5B are schematic diagrams showing the electrode arrangement relationship of the antenna according to the first embodiment of the present invention. Therefore, actually, the feed electrode 5 formed on the second substrate is illustrated as if formed on the first substrate, and FIG. 6 is a plan view of the antenna according to the first embodiment of the present invention. FIG. 3 is a view particularly clarifying a side surface of the antenna 1.

In the figure, reference numeral 1 denotes an antenna,
Is composed of a first substrate 2 and a second substrate 3 on which various electrodes and the like are formed. Although the number of substrates constituting the antenna 1 is two here, three or more substrates may be used.

The first substrate 2 and the second substrate 3 constituting the antenna 1 are made of a dielectric material. The relative permittivity εr of this dielectric material is 6 or more and 150 or less (preferably 40 or less).
The following is preferred. By having the relative dielectric constant in this range, the resonance frequency band can be widened while the size of the antenna 1 is reduced. Note that the relative dielectric constant ε
If r is smaller than 6, the substrates 2 and 3 become too large, so that the antenna cannot be downsized, and the relative dielectric constant εr is 1
If it is larger than 50, the resonance frequency band becomes too narrow,
Even if a slight difference in composition or chipping occurs in each of the substrates 2 and 3, the resonance frequency band is deviated, so that predetermined characteristics cannot be obtained, and the characteristics vary greatly.

The first substrate 2 and the second substrate
Specific examples of the constituent material of the substrate 3 include a resin, a liquid crystal polymer, and a ceramic. Among these constituent materials, it is preferable to use ceramics in consideration of good weather resistance, high mechanical strength, and low cost. When ceramic is used as a constituent material of the substrate,
The sintering density is preferably 92% or more (more preferably 95% or more) in order to increase the coagulation force and the like. As a result, the mechanical strength and workability of each of the substrates 2 and 3 can be improved, and a decrease in the Q value and the relative dielectric constant can be suppressed. As a result, stable characteristics can be obtained. If the sintering density is 92% or less, an increase in dielectric loss and a variation in relative permittivity εr may increase, causing a problem.

The first substrate 2 and the second substrate 3 have a surface roughness of 10 μm or less (especially preferably 7 μm or less, more preferably 5 μm or less) in order to form a high-quality electrode described later. ) Is preferable. As a result, a decrease in the Q value can be suppressed, and the gain of the antenna 1 can be improved. The surface roughness is 10μ.
When it is more than m, the conductor loss of the electrode increases, so that the gain of the antenna 1 decreases. When it approaches 0 more than necessary, the time required for the grinding process becomes extremely long, and the productivity decreases, which is not preferable. .

When the first substrate 2 and the second substrate 3 are made of ceramic, specific materials include forsterite ceramics and alumina ceramics when the relative dielectric constant εr is 10 or less. When εr is 10 to 25, a material such as magnesium titanate or calcium titanate is used. When εr is 25 to 40, a zirconia-tin-titanium-based material is used.
In the case of 50, barium titanate or lead-calcium-
Titanium-based materials and the like can be mentioned.

The shapes of the first substrate 2 and the second substrate 3 are rectangular plates as shown in FIGS. 1, 2 and 3, and other shapes such as elliptical plates and polygonal plates (triangular, quadrangular, A pentagon can be used, but a rectangular plate or a polygon is preferable because an electrode needs to be formed on the side surface.

Further, in this embodiment, the characteristics can be made uniform or the characteristics can be stabilized by making the thickness of the antenna 1 uniform (the thickness of the central portion and the thickness of the end portion are almost the same). The thickness of the antenna 1 may be varied between predetermined portions depending on the use situation, the type of machine used, and the like. That is, for example, a plurality of concave portions can be formed in the antenna 1, and the thickness of one end of the antenna 1 can be made thicker or thinner than the thickness of the opposite end.

Further, by chamfering or tapering the corners of the antenna 1, it is possible to prevent the corners 2c of the antenna 1 from being largely chipped or the like, thereby preventing the characteristics from being changed.

Therefore, as described above, by previously chamfering or tapering the corners, it is possible to prevent the transmission and reception characteristics from being changed due to the large chipping of the corners 2c of the antenna 1 on the way. Almost gone.

At this time, it is preferable to perform the C chamfering in consideration of productivity and the possibility of performing a reliable corner processing.
At this time, the radius of the C chamfer is set to 0.1 mm or more (preferably 0.2 mm or more), so that even if a slight impact is applied to the antenna 1, the corners of the antenna 1 are almost not chipped, and the like. Even if a large impact or the like is applied so that the antenna 1 is chipped, only a slight chipping occurs, and no significant change in transmission or reception characteristics occurs. This chamfering or tapering of the antenna 1 is necessary irrespective of the material constituting the antenna 1, but is particularly effective when ceramics, which are relatively easy to chip as described above, are used. Further, as another embodiment, an organic resin or the like for preventing chipping is provided at the corner of the antenna 1 without performing the C-chamfering or tapering at the corner of the antenna 1, thereby increasing the size of the corner. Chipping can be prevented.

By performing such chipping prevention measures, it is possible to suppress a process defect due to chipping, and
Productivity and yield can be improved.

When the width of the antenna 1 is L1 (cm), the length is L2 (cm), and the thickness is L3 (cm), the following conditions are satisfied. The antenna 1 can be supplied stably, and the gain and the bandwidth can be appropriately secured.

2 × λ0 / (7 × εr1 / 2) ≦ L1 ≦ 2 ×
λ0 / (2 × εr1 / 2) 2 × λ0 / (7 × εr1 / 2) ≦ L2 ≦ 2 × λ0 / (2 ×
εr1 / 2) λ0 / (30 × εr1 / 2) ≦ L3 ≦ λ0 / (2 × εr1 /
2) Here, λ 0 represents a free space wavelength (unit: cm) at a center frequency when the antenna 1 is operated, and εr represents a relative dielectric constant of a material used for the antenna 1. If the thickness L3 is less than the above range, the mechanical strength of the antenna 1 itself becomes low, cracks and the like are easily generated, and a decrease in gain and a decrease in bandwidth are caused.

The first substrate 2 and the second substrate 3 may be formed of the same material, or may be formed of materials having different relative dielectric constants.

In particular, by making the relative permittivity of each of the substrates 2 and 3 different, it is possible to make the size of each of the substrates 2 and 3 different as shown in FIGS. 4 (a) and 4 (b). become.

For example, as shown in FIG. 4A, by making the relative permittivity of the first substrate 2 larger than the relative permittivity of the second substrate 3, the first substrate 2 3, the main surface 2a on which the electrode is formed can be made smaller. Thereby, the size of the antenna 1 can be reduced. In particular, when the antenna 1 is covered with a housing such as a radome, it is possible to adopt a configuration in which the upper part of the housing is narrowed down. Also in the case where the electronic device is mounted, the space utilization efficiency inside the electronic device can be improved.

On the other hand, as shown in FIG.
By making the relative dielectric constant of the first substrate 2 larger than that of the first substrate 2, the second substrate 3 can have a smaller main surface 3 a on which electrodes are formed than the first substrate 2. Since the mounting area of the antenna 1 can be reduced, the size of the antenna circuit board of the electronic device on which the antenna 1 is mounted can be reduced, and further, the first substrate 2 is replaced by the second substrate 3
Due to the difference in size between the first and second substrates, electronic components and the like are placed in a gap formed between the antenna circuit board of the electronic device on which the antenna 1 is disposed and the first substrate 2, thereby further improving space utilization efficiency. The size of not only the antenna 1 but also the size of the antenna circuit board on which the antenna 1 is mounted and the size of the electronic device on which the antenna 1 is mounted can be reduced, thereby meeting the demands of the age of miniaturization of the device. In addition, since the mounting area on the antenna circuit board is reduced, reliability such as thermal shock is improved.

Further, by making the relative permittivity of each of the substrates 2 and 3 different, the degree of freedom of the shapes of the first substrate 2 and the second substrate 3 can be improved.

For example, as shown in FIG. 4A, a concave portion 3f is provided in a main surface 3a of the second substrate 3 on which a power supply electrode is formed.
By adopting a configuration in which the first substrate 2 is fitted into the concave portion 3f, positioning when joining the first substrate 2 and the second substrate 3 is also facilitated. In addition, an antenna with high productivity with less occurrence of positional deviation during manufacturing can be obtained. Conversely, as shown in FIG. 4B, the first substrate 2
By providing the concave portion 2f in the main surface 2a, positioning with respect to the second substrate 3 becomes easy.

As shown in FIG. 4A, by forming the area of the main surface 2a of the first substrate 2 smaller than the area of the main surface 3a of the second substrate 3, the first substrate 2 and 2
Of the characteristics due to the displacement of the mounting position of the antenna 3 with respect to the substrate 3 can be minimized, and the requirements for the accuracy of the alignment between the substrates are low, in other words, the productivity of the antenna 1 is high and the yield is high. Can be realized.

The first substrate 2 constituting the antenna 1
When the thickness of the second substrate 3 is t2 and the thickness of the second substrate 3 is t3, the following conditions are preferably satisfied.

0.1 × t2 ≦ t3 <1 × t2 By satisfying such conditions, the coupling between the radiation electrode 4 and the feed electrode 5 can be weakened, and the first substrate 2 constituting the antenna 1 can be weakened. The thickness t2 is the thickness t of the second substrate 3.
3, the length and width of the power supply electrode 5 and the relative position of the power supply electrode 5 and the power supply electrode 5 are smaller than those in the case where the coupling between the radiation electrode 4 and the power supply electrode 5 is strengthened. Even if there is a large deviation, the input impedance, which is one of the important antenna characteristics, can be kept in a desired range. For this reason, it is possible to supply a large amount of antennas with small variations in characteristics at low cost, and to stabilize the antenna characteristics.

If t3 is less than 10% of the thickness of t2, the coupling between the power supply electrode 5 and the ground electrode 6 becomes too strong, which makes it difficult to adjust the input impedance and increases the loss of the power supply electrode. As a result, antenna characteristics may be degraded.

Further, if t3 becomes thicker than t2, it becomes necessary to increase the thickness of the antenna 1 in order to reduce the above-mentioned variation in characteristics, which causes a problem that the antenna 1 cannot be miniaturized.

Next, each member such as electrodes formed on the first substrate 2 and the second substrate 3 will be described.

1 to 6, reference numeral 4 denotes a radiation electrode. The radiation electrode 4 is formed on the main surface 2a of the first substrate 2,
It is separated from any end of the main surface 2a and has a substantially square shape. Here, the shape of the radiation electrode 4 is a square here, but it may be a polygon, a circle, or an ellipse, but a square is preferred because it is easiest to adjust the capacitance.

The power supply electrode 5 is connected to the main surface 3 of the second substrate 3.
a, a rectangular electrode is formed from near the center of the main surface 3a to one end thereof, and the side surface 3c of the second substrate 3 is formed.
In a state of being electrically connected to the side surface electrode 7 formed on the substrate. Note that the shape of the power supply electrode 5 is not limited to a rectangular shape, and may be a shape in which the end on the center side is formed larger, or may be another shape. Further, a power supply portion 7a is formed at an end of the main surface 3b of the second substrate 3. The power supply portion 7a is electrically connected to the side electrode 7 and serves as a contact point with a power supply terminal of a substrate (not shown) to which the antenna 1 is attached.

Reference numeral 6 denotes a ground electrode. The ground electrode 6 is formed on the main surface 3b of the second substrate 3. Further, near the corner of the ground electrode 6, the ground electrode 6 extends from the main surface 3b to the side surface 3c. From the ground side electrode 6a is formed. The ground side electrode 6a is used as a joint point when the ground on the substrate (not shown) to which the antenna 1 is attached and the ground electrode 6 are electrically connected, and also serves as a fixing point of the antenna 1. In this embodiment, the ground side surface electrode 6a is provided at four places, but may be provided at four places or less. However, from the viewpoint of mounting strength and productivity, about four places are most preferable.

Next, the positional relationship between the ground electrode 6 formed on the main surface 3b of the second substrate 3 and the power supply portion 7a will be described.

A ground electrode 6 is provided on almost the entire surface of the main surface 3b of the second substrate 3, and a notch 6
b, and a ground side electrode 6a is formed near the corner. The notch 6b has a gap 3 with the ground electrode 6.
A power supply portion 7a is formed via e. At this time, the electrode thickness of the ground electrode 6 and the power supply portion 7a should be almost the same thickness. When the antenna 1 is mounted on a flat surface such as a substrate, the ground electrode 6 floats or, on the contrary, the power supply portion 7a. 7a can be suppressed from floating from the substrate, and the electrode and the antenna 1 can be prevented.
Can be favorably joined to the terminals formed on the substrate on which the substrate is installed. In addition, it is possible to minimize variations in various conditions such as wobble and installation angle of the antenna 1. Further, the width of the gap 3e is 0.2 mm to 2 m.
When the distance is about m, the size of the ground electrode 6 can be sufficiently ensured while preventing a short circuit between the ground electrode 6 and the power supply portion 7a.

Further, it is preferable that a corner portion of the power supply portion 7a close to the ground electrode 6 is provided with a taper or a radius. There is a potential difference between the ground electrode 6 and the power supply 7a.
a is sharp, and depending on the use condition, for example, when the humidity is extremely high, the ground electrode 6 and the power supply portion 7a
There is also a possibility that a short circuit will occur. This short-circuit can be suppressed by providing a taper or R at a corner of the power supply unit 7a close to the ground electrode 6.

In practice, the preferred range is "about C = 0.2" for taper, and "R = about 0.2" for R.
It is enough.

As described above, the ground electrode 6 and the feeding portion 7a are formed on the same main surface 3b, and the main surface 3b is arranged on the antenna substrate (not shown). Can be eliminated, so that an antenna that can be surface-mounted can be realized. In addition, since the power is supplied to the power supply electrode 5 through the power supply portion 7a and the side electrode 7 through the power supply portion 7a and the side electrode 7, the mounting state can be checked from the side surface of the antenna.
It is possible to easily check the operation of the antenna.

As shown in FIG. 4A, the width W1 of the radiation electrode 4, the length L4, the width W2 of the side electrode 7, the width W3 of the power supply electrode 5, and the length L5 from the side of the substrate are as follows. Have a relationship.

0.3 × L1 ≦ W1 ≦ 0.9 × L1 0.3 × L2 ≦ L4 ≦ 0.9 × L2 0.5 × L1 ≦ W2 ≦ 0.9 × L1 0.1 × L1 ≦ W3 ≦ 0.5 × L1 0.3 × L2 ≦ L5 ≦ 0.9 × L2 Although the above description is for a linearly polarized antenna,
Here, the structure of the radiation electrode 4 corresponding to circular polarization will be described with reference to the drawings.

In the antenna having such a configuration, a circularly polarized antenna can be obtained by providing cutouts at two diagonal corners of the radiation electrode 4.

That is, by providing the notch 4g at a position as shown in FIG. 5A with respect to the power supply electrode 5, it becomes a right-handed circularly polarized wave antenna.
By providing the cutout portion 4g at the position as shown in FIG. At this time, if the area of the cutout portion 4g is s and the area of the radiation electrode 4 is S, a good axial ratio can be obtained by setting the following range.

0.01 ≦ s / S ≦ 0.1 The power supply electrode 5 is connected to the side electrode 7 and to the power supply portion 7a formed on the main surface 3b of the second substrate 3. The relationship between the side electrode 7 and the power supply electrode 5 will be described with reference to FIGS.

The width W4 of the side electrode 7 shown in FIG. 6 is preferably equal to the width W3 of the power supply electrode shown in FIG.
There is no practical problem in the following range.

0.8 × W3 ≦ W4 ≦ 1.2 × W3 A gap 3e is provided around the power supply portion 7a on the main surface 3b of the second substrate 3 so as not to contact the ground electrode 6.

It is desirable to provide a gap between the ground electrode 6 and the end of the second substrate 3 where the side electrode is not provided. By providing the gap, it is possible to prevent the ground electrode from being lost due to chipping generated at the end of the substrate, and the antenna characteristics are stabilized.

Next, electrode materials used for each electrode will be described.

The radiation electrode 4, the feeding electrode 5, the earth electrode 6,
Side electrodes 7 (hereinafter abbreviated as electrodes) are made of Ag, Au, C
A single u or Pd metal material, an alloy thereof, or an alloy of the above metal material with another metal (Ti, Ni, or the like) is used. Among these materials, Ag or an alloy of Ag and another metal material is particularly excellent in characteristics and workability when forming each electrode.
It is preferably used. Further, each electrode may be formed of one layer, or may be formed of two or more layers. That is, a film of another metal material is formed as a buffer layer between the antenna 1 and each electrode for the purpose of improving the adhesion strength or the like, or for the purpose of protecting each electrode on each electrode. Alternatively, a metal material or a protective film having good corrosion resistance may be formed.
Gold, platinum, titanium, etc., as metal materials with good corrosion resistance,
Examples of the protective film having good corrosion resistance include epoxy-based and silicon-based resins. Further, each electrode may contain at least one of oxygen, nitrogen and carbon as an impurity to such an extent that characteristics are not affected.

The electrodes and the like are formed by a printing method, a plating method, a sputtering method, or the like. In particular, when each electrode is formed to be relatively thin, it is preferable to use a sputtering method or a plating method, and when it is formed to be relatively thick, it is preferable to use a printing method. In the case of the present embodiment, the printing method is used because the productivity is good. Specifically, a paste in which metal particles such as Ag, a glass frit, a solvent, and the like were mixed was applied on the antenna 1 in a predetermined shape, and heat treatment was applied to form each electrode.

The thickness of each electrode is 0.01 μm to 50 μm.
μm (preferably 1 μm to 40 μm). When the film thickness of each electrode is 0.01 μm or less, the gain of the antenna may be reduced because it is thinner than the skin depth, and when the film thickness of each electrode is 50 μm or more, the electrode is easily peeled, In addition, problems such as an increase in cost occur.

Next, the joining between the first substrate 2 and the second substrate 3 will be described.

In the antenna 1 shown in this embodiment, after a predetermined member such as an electrode is formed on each of the first substrate 2 and the second substrate 3, the two substrates are joined. As a joining material used for this joining, it is preferable to use a material having a high joining strength such as joining glass or joining resin. In particular, by using the bonding glass, it is possible to withstand heat treatment such as reflow. Further, since the composition can be easily changed so that the thermal expansion coefficient becomes substantially equal to the thermal expansion coefficient of the substrate material, it is possible to improve the occurrence of inconvenience such as peeling of the substrate due to thermal shock.

Further, it is preferable that the gap between the first substrate 2 and the second substrate 3 at the time of bonding is 1 μm to 200 μm. By setting the gap to this range, a sufficient bonding force can be ensured, the alignment between the substrates can be easily performed, and the impedance matching can be accurately obtained.
It is possible to stably supply a small and reliable surface mountable antenna.

If the gap is less than 1 μm, the first substrate 2
The bonding between the substrate and the second substrate 3 tends to be insufficient, there is a possibility of peeling during use, and ringing tends to occur between the substrates, making it difficult to perform alignment between the substrates. . When the thickness is 200 μm or more, it is difficult to achieve impedance matching of the antenna due to the influence of glass or resin serving as a bonding medium, and the effective relative dielectric constant of the antenna is reduced.
Inconveniences such as difficulty in downsizing the antenna occur.

Next, a method of manufacturing the antenna having the above configuration will be described with reference to the drawings.

FIG. 11 is a flowchart showing a method of manufacturing an antenna according to the first embodiment of the present invention.

Since the manufacturing steps of the first substrate 2 and the second substrate 3 are almost the same, the first substrate 2 will be described as a representative here.

First, as a step 1, a molding die is filled with a material for forming a substrate, and pressed by a press device to obtain a molded body to be the first substrate 2. By providing irregularities and the like in the shape of the mold at this time, the shape of the first substrate 2 can be freely formed.

Next, as a step 2, the formed bodies formed in the step 1 are set in a firing furnace along with a sheath, and fired under predetermined firing conditions to form a fired body.

Next, as a step 3, the radiation electrode 4 is formed on the fired body formed in the step 2. At this time, as a method of forming the radiation electrode 4, printing, sputtering,
Although a method such as vapor deposition is conceivable, in this case, by using printing, an electrode can be formed relatively accurately and in a short time for each condition such as thickness and shape.
Here, in the case of the second substrate 3, instead of the radiation electrode 4, the ground electrode 6, the side surface electrode 7, the power supply portion 7a, the power supply electrode 5, and the like are formed.

Next, as a step 4, a quenching process is performed on the fired body on which the radiation electrode 4 is formed to improve the bonding strength between the radiation electrode 4 and the fired body.

Next, in step 5, fine adjustment is made to the shape of the radiation electrode 4 formed in steps 3 and 4 as necessary. Note that this step is unnecessary when the accuracy of forming the radiation electrode 4 is sufficiently high.

Through the above steps, the first substrate 2 and the second substrate 3 are formed.

In step 6, a bonding material is attached to at least one of the main surface 2b of the first substrate 2 on which the radiation electrode 4 is not formed and the main surface 3a of the second substrate on which the power supply electrode 5 is formed. Is applied. Regarding the method of applying the joining material, the joining material may be applied in a dot shape or a planar shape. Here, especially by forming by printing, the distribution of the bonding material can be made uniform and the variation in the thickness of the bonding portion can be suppressed to the minimum, so that an antenna having stable antenna characteristics can be realized. In addition, by printing on the main surface 2b of the first substrate 2 on which no electrodes are formed, it is possible to eliminate variations in the thickness of the printed bonding material due to the presence of the electrodes, so that an antenna having more stable antenna characteristics is provided. Can be realized.

At this time, it is preferable to control the bonding state so that the thickness of the bonding portion is 1 μm or more and 200 μm or less. By adjusting the thickness of the bonding portion in this range, the position of the first substrate 2 and the second substrate 3 at the time of bonding can be easily adjusted, and an antenna having stable antenna characteristics can be realized.

Thereafter, as step 7, an appearance inspection, characteristic inspection, and the like are performed, and the antenna 1 is completed.

With this configuration, the electrodes 4, 5, 6, and 7 can be formed after the substrates 2 and 3 are fired. , 3 can be adjusted to the sintering temperature of the material, and the strength of each of the substrates 2, 3 and thus the strength of the antenna 1 can be increased.

Since the electrodes 4, 5, 6, 7 are applied after the substrates 2, 3 are fired, the electrodes 4, 5, 6, 7,
The deterioration of each of the electrodes 4, 5, 6, 7 due to the high-temperature baking can be almost eliminated as compared with the case of baking the substrate after the formation.

Further, after the predetermined electrodes 4, 5, 6, 7 are formed on the first substrate 2 and the second substrate 3, and before the first substrate and the second substrate are joined, The antenna characteristics are measured, and based on the results, each of the electrodes 4, 5, 6, 7
By adjusting the shape of the antenna, the antenna characteristics can be easily adjusted, so that the adjustment range is very wide.
Therefore, a highly reliable antenna with an extremely low defect rate can be realized.

Further, as compared with the case where electrodes are formed between layers and firing is performed integrally, since there is no complicated production process and no expensive and large-scale production equipment is required, the production cost can be reduced. Furthermore, since it can be produced by a common method with a patch antenna using a conventional feed pin, an inexpensive antenna can be supplied stably.

(Embodiment 2) Next, Embodiment 2 of the present invention will be described with reference to the drawings.

FIG. 7 is a perspective view showing a configuration of an antenna according to the second embodiment of the present invention. Note that members having the same configuration as in Embodiment 1 are given the same numbers. Hereinafter, parts different from the first embodiment will be mainly described.

Reference numeral 8 denotes a second power supply electrode.
When the antenna 1 is formed by joining the first substrate 2 and the second substrate 3 to each other, the first substrate 2 is formed of a rectangular electrode extending from the vicinity of the center of the main surface 2b of the first substrate 2 to one end thereof. The second substrate 3 is provided so as to face the power supply electrode 5 on which the main surface 3a is formed. The material forming the second power supply electrode 8 is the same as the power supply electrode 5 shown in the first embodiment.

By providing the power supply electrodes 5 and 8 on both the first substrate 2 and the second substrate 3 as described above, the power supply electrodes 5 are provided.
And the second power supply electrode 8 can be firmly bonded via the electrode material, so that the bonding between the first substrate 2 and the second substrate 3 can be further strengthened.

The size of the second power supply electrode 8 formed on the first substrate 2 is changed by the size of the power supply electrode 5 formed on the second substrate 3.
Is smaller than the size of the first substrate 2, it is possible to minimize the variation in characteristics due to the displacement of the mounting position between the first substrate 2 and the second substrate 3. It is possible to realize an antenna that is low, in other words, high in productivity and high in yield.

The first substrate 2 and the second substrate 3 having such a structure are joined together with a thermal expansion coefficient of 4 to 8 ppm /
The use of a material of about ° C. can minimize the stress generated due to the difference in the coefficient of thermal expansion, and when the materials of the first substrate 2 and the second substrate 3 are made different, However, even if there is a difference in the coefficient of thermal expansion, cracks and the like at the joint surface can be made less likely to occur. As a particularly suitable material, it is preferable to use lead glass,
Particularly, among lead glass, at least SiO ₂ is 10 to 7
0wt%, B ₂ O ₃ is 2~25wt%, Al ₂ O ₃ is 3 to 1
The use of lead glass containing a material in the range of 5 wt% and PbO in the range of 10 to 65 wt% involves a difference in thickness between the first substrate 2 and the second substrate 3 and a difference in coefficient of thermal expansion. However, it is preferable because the occurrence of cracks and the like at the joint can be efficiently suppressed.

Also, the bonding between the first substrate 2 and the second substrate 3 may be performed by the bonding force between the power supply electrodes 5 and 8. In this case, the joining process between the first substrate 2 and the second substrate 3 can be simplified and the joining material can be eliminated, so that the productivity is improved and the manufacturing cost is reduced. Can be.

(Embodiment 3) Next, an application example using the above-described antenna will be described.

FIG. 8 is a diagram showing a wireless LAN device according to the third embodiment of the present invention. In FIG.
Is a wireless LAN device, 22 and 23 are electronic devices such as personal computers connected to the wireless LAN devices 20 and 21, respectively, and 24 is a wireless LAN device 2
0 is a receiving means provided in the wireless LAN device 20.
, Transmitting means provided in the wireless LAN device 21, transmitting means provided in the wireless LAN device 21, and wireless LAN devices 28 and 29, respectively.
The antenna 1 provided in each of the devices 20 and 21 and shown in FIGS. 1 to 7 described above was used.

When it is desired to transfer predetermined data from the electronic device 22 to the electronic device 23, the data signal sent from the electronic device 22 is modulated by the transmission means 25, converted into a predetermined transmission signal, and transmitted. The signal is transmitted from the antenna 28. The transmission signal transmitted from the antenna 28 is
9 and demodulated into a predetermined data signal by the receiving means 26, and the data signal is sent to the electronic device 23.

Conversely, when it is desired to transfer predetermined data from the electronic device 23 to the electronic device 22, the data signal sent from the electronic device 23 is modulated by the transmitting means 27 and converted into a predetermined transmission signal. The transmission signal is transmitted from the antenna 29. The transmission signal transmitted from the antenna 29 is received by the antenna 28, demodulated into a predetermined data signal by the receiving unit 24, and the data signal is transmitted to the electronic device 22.

The wireless LAN device 2 configured as described above
In the case of 0 and 21, the antennas 28 and 29 can be made very small, and the directivity of the transmission / reception characteristics can be increased in the horizontal direction. The number of places to be arranged is reduced, the layout is simplified, and data communication can be performed reliably.

(Embodiment 4) Next, another application example will be described.

FIG. 9 is a diagram showing a data transmission / reception system according to the fourth embodiment of the present invention. Reference numeral 30 denotes a main body, and 31 denotes a counting means for counting, for example, the amount of things that require billing such as tap water, fuel, electricity, and the like. , 32 are transmission means, 33 is reception means, 34 is storage means for storing data and the like counted by the counting means 31. As the storage means 34, a storage device such as a semiconductor memory or a magnetic disk device is used. 35 is a control means, 36 is an antenna shown in FIGS. 1 to 7, 37 is a terminal device, 38 is a transmitting means, 39 is a receiving means, 40 is a control means, and 41 is an antenna shown in FIGS. The antenna 41 may be another type of antenna (such as a helical antenna).

The operation of the data transmission / reception system configured as described above will be described below. A specific example applied to a tap water meter will be described.

First, the amount of tap water used at home or the like is measured by the counting means 31, and the used amount is stored in the storage means 34 in the form of data. Then, the terminal device 37 periodically measures the amount of tap water used by wireless communication.
Specifically, when predetermined data is input from input means (not shown) provided in the terminal device 37, the control means 40
Transmits a request signal for requesting predetermined data from the antenna 41 via the transmission means. Here, the transmitting means 38 modulates the data signal sent from the control means 40 and converts it into a request signal. When the request signal is received by the antenna 36, the received signal is modulated by the receiving means 33, converted into a request data signal, and the request data signal is sent to the control means 35. The control means 35 having received the request data signal sends a signal to the storage means 34 or the like so as to send the use data corresponding to the usage amount of tap water counted by the count means 31 to the transmission means 32 by a predetermined time. . The transmitting means 32 modulates the use data signal transmitted from the storage means 34 and converts it into a use signal.
The data is transmitted from the antenna 36 (as another method, when the use data signal from the storage means 34 is received by the control means 35, it may be transmitted to the transmission means 32 via the control means 35). When the transmitted use signal is received by the antenna 41, the receiving means 39
Is demodulated into a use data signal, and the use data signal is sent to the control means 40. Here, the control means 40 displays the amount of tap water used by an output means and a display means such as a printer and a display (not shown), and a storage means such as a semiconductor memory and a magnetic disk device (not shown). Or memorize in the means.

With such a configuration, the main body 30 is bothersome.
It is not necessary to move to the vicinity of, and it is not necessary to look at a meter or the like provided on the main body 30 to measure the amount. Can be planned.

In the data transmission / reception system as described above, by configuring at least the antenna 36 with the antenna 1 shown in FIGS. 1 to 7, the main body 30 can be reduced in size and weight, and can be installed without taking up any space. It is possible to expand the area that can be transmitted and received. In the fourth embodiment, the counting means 31 is provided outside the main body 30, but the same effect can be obtained by providing the counting means inside the main body 30.

(Embodiment 5) Next, another application example will be described.

FIG. 10 is a diagram showing a data transmission / reception system according to the fifth embodiment of the present invention, particularly showing an example applied to an automatic toll collection system at a tollgate such as a toll road.

In FIG. 10, reference numeral 100 denotes a vehicle-mounted device;
Denotes an IC card, and 300 to 500 denote road devices.
The roadside machine 300 is for an entrance gate, the roadside machine 400 is for a check barrier for grasping the route of a toll road, and the roadside machine 5
00 is for the exit gate, and these roadside machines 300, 4
00 and 500 are all connected to the host computer of the center device, and record and manage the traffic history information of the vehicle based on the information from the road devices 300, 400 and 500.

First, the vehicle-mounted device 100 will be described in detail. The on-vehicle device 100 includes an antenna unit 112 that performs wireless communication with the road devices 300, 400, and 500;
And an information recording unit 113 for recording information used for wireless communication with the driver (00, 500), and information (IC driver 200) and information received from the road devices 300, 400, 500 via the antenna unit 112. ), A buzzer 115 that emits a buzzer sound to call the user's attention, and an IC card 200.
Operation unit 11 such as keys for performing various operations including discharge of
6, a power supply unit 117 for supplying power to each unit of the vehicle-mounted device 100, an interface unit 118 for supplying power to the IC card 200 and exchanging information,
The control unit 119 controls the entire vehicle-mounted device 100. The antenna unit 112 uses the antenna 1 shown in FIGS. Power supply unit 11
Numeral 7 supplies power from a dry battery or a vehicle-mounted battery.

In the information recording unit 113 of the on-vehicle device 100, vehicle information (vehicle length, vehicle weight, number of axles, etc.), on-vehicle device installation information (expiration date, installation location) and the like are recorded in advance as permanent information. In addition, information relating to an entrance and a route (passing gate number, passing date and time, etc.), information of an IC card, and the like are recorded as temporary information.

In the case of a four-wheeled vehicle, the front part of the vehicle such as the windshield of the vehicle, the dashboard, or the hood or roof of the vehicle body is mounted on the road machines 300, 400, 500 in the case of a four-wheeled vehicle. Wireless communication can be performed favorably.

Regarding the arrangement position of each part inside the on-vehicle device 100, it is particularly preferable that the antenna unit 112 is arranged on the upper surface or the front surface in the vehicle traveling direction, so that the signal transmission and reception in the antenna unit 112 is good. It is preferable because it can be performed.

In particular, by using the antenna 1 shown in FIGS. 1 to 7 for the antenna section 112, the antenna section 112 can be made light and thin, so that the vehicle-mounted device 100 can be reduced in size, thickness, and weight. In addition, it is possible to prevent the vehicle-mounted device 100 placed in the vehicle from obstructing the driver's view. Further, since the weight is reduced, the swing generated in the vehicle-mounted device 100 due to the vibration of the vehicle can be suppressed to a minimum, so that good transmission / reception performance can be realized even during high-speed movement. In addition, since the directivity of the transmission / reception characteristics can be increased in the horizontal direction, the arrangement of the on-vehicle device 100 and the limitation on the arrangement position of the antennas are reduced, and the layout is simplified, and the transmission / reception characteristics are extremely good. Good data exchange can be performed, and the occurrence of data transfer errors and the like is extremely reduced, so that a highly reliable system that can reliably charge a fee can be provided.

Further, by using the antenna 1 shown in FIGS. 1 to 7, it is possible to suppress the occurrence of inconvenience such as damage to the joint between the antenna and the circuit board due to the vibration of the vehicle.

Next, the IC card 200 will be described.

The IC card 200 includes an interface unit 210 for receiving power supply and information exchange from the vehicle-mounted device 100, an information recording unit 220 for recording various information relating to the use of the IC card 200,
And a control unit 230 for performing control relating to reading and writing of 00. Information recording section 220 of IC card 200
As permanent information, user information such as user ID number, issuance information such as issue date, prepaid / postpaid classification, available balance, expiration date, settlement information such as member account number, system usage Related history information and the like are recorded. In addition, entrance information and route information are recorded as temporary information. Although an IC card is used as the information recording medium in the fifth embodiment, a magnetic card may be used instead of the IC card, or an optical card may be used.

In the automatic toll collection system having the above configuration, the on-vehicle device 100 and the on-road devices 300 to 500
Since information exchange is performed by wireless communication using the respective antennas between them, this will be described below.

First, a vehicle equipped with the on-vehicle device 100 (four-wheel two
Irrespective of the wheel) enters the toll road entrance gate,
The on-road unit 300 provided at the entrance gate determines a vehicle type of a passing vehicle by a vehicle type determination device (not shown). After vehicle collation is performed based on the determined vehicle type information and vehicle information transmitted from the antenna unit 112 of the vehicle-mounted device 100 of the passing vehicle, entrance information is transmitted to the vehicle-mounted device 100. In-vehicle device 1
In 00, when the entrance information is received by the antenna unit 112, the control unit 119 records the information in the information recording unit 113.

Next, when the vehicle passes through the check barrier while traveling on the toll road, the on-road unit 400 provided on the check barrier transmits the route information to the on-vehicle unit 100. In the vehicle-mounted device 100, the route information is received by the antenna unit 112, and the control unit 119 records the information in the information recording unit 113.

Further, when the vehicle enters the exit gate of the toll road, the on-road unit 500 provided at the exit gate performs vehicle collation in the same manner as the entrance gate.
Send to 00. In the vehicle-mounted device 100, the exit information is received by the antenna unit 112, the control unit 119 records the information in the information recording unit 113, and the control unit 119 transmits the entrance information, the route information, and the settlement information from the antenna unit 112 to the road. The call is transmitted to the device 500. Then, based on the information from the on-vehicle device 100 received by the on-road device 500, a toll settlement process is performed.

In the automatic toll collection system configured as described above, the roadside devices 300, 400, 500 and the onboard device 100
Since the transmission / reception characteristics between the terminal and the server are extremely good, it is possible to exchange good data and the like, and the occurrence of data transfer errors and the like is extremely reduced. System.

As described above, the application examples of the antenna of the present invention have been described with reference to the third to fifth embodiments. Other than this, for example, a terrestrial radio system such as a portable information terminal and a navigation system, and a satellite radio system It is needless to say that the present invention can be applied to such applications.

[0132]

According to the present invention, a power supply electrode provided between a radiation electrode and a ground electrode provided at a distance, a power supply unit electrically connected to the power supply electrode, and supplying power to the power supply electrode; A configuration in which a power supply unit is electrically joined and a side electrode provided in non-contact with the ground electrode, and a dielectric material is provided between the radiation electrode and the power supply electrode and between the power supply electrode and the ground electrode; As a result, power can be supplied from the side of the antenna, so that the mounting state can be confirmed from the side of the antenna. Since there is no protrusion such as a power supply pin, an antenna that can be surface-mounted and has high productivity can be provided.

A first substrate on which a radiation electrode is formed;
A ground electrode and a power supply portion are formed on one surface, a power supply electrode is formed on the other surface, and a second substrate on which a side surface electrode that connects the power supply portion and the power supply electrode is formed on a side surface is provided.
Since electrode adjustment and the like can be performed for each substrate, variations in antenna characteristics can be reduced, and
Since expensive equipment such as an integrally fired product by lamination is not required, and it can be manufactured by a common method with a conventional patch antenna of a feeding method using a feeding pin, an inexpensive antenna can be stably supplied.

[Brief description of the drawings]

FIG. 1 is a front perspective view showing an antenna according to a first embodiment of the present invention.

FIG. 2 is a rear perspective view showing the antenna according to the first embodiment of the present invention.

FIG. 3 is a perspective view showing an antenna according to the first embodiment of the present invention.

FIG. 4 is a sectional view showing the antenna according to the first embodiment of the present invention.

FIG. 5 is a schematic diagram showing an electrode arrangement relationship of the antenna according to the first embodiment of the present invention.

FIG. 6 is a plan view of the antenna according to the first embodiment of the present invention.

FIG. 7 is a perspective view showing a configuration of an antenna according to a second embodiment of the present invention.

FIG. 8 is a diagram showing a wireless LAN device according to a third embodiment of the present invention.

FIG. 9 is a diagram showing a data transmission / reception system according to a fourth embodiment of the present invention.

FIG. 10 is a diagram showing a data transmission / reception system according to a fifth embodiment of the present invention.

FIG. 11 is a flowchart showing a method for manufacturing an antenna according to the first embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Antenna 2 1st board | substrate 2a, 2b main surface 3 2nd board | substrate 3a, 3b main surface 3c Side surface 3e Gap 3f recessed part 4 Radiation electrode 4g Notch part 5 Feeding electrode 6 Earth electrode 6a Ground side electrode 6b Notch part 7 Side electrode 7a Power supply section 8 Second power supply electrode 20, 21 Wireless LAN device 22, 23 Electronic equipment 24, 26 Receiving means 25, 27 Transmitting means 28, 29 Antenna 30 Main body 31 Counting means 32 Transmitting means 33 Receiving means 34 Storage means 35 Control means 36 Antenna 100 On-board unit 112 Antenna unit 113 Information recording unit 114 Display unit 115 Buzzer 116 Operation unit 117 Power supply unit 118 Interface unit 119 Control unit 200 IC card 210 Interface unit 220 Information recording unit 230 Control unit 300, 400, 500 on the road Machine

Continued on the front page (72) Atsushi Yoshinomoto, Inventor 1006 Kazuma Kadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. Terms (reference) 5J045 AB06 DA10 EA08 HA03 MA07 NA01 5J046 AA09 AA19 AB13 PA07

Claims (22)

[Claims] A radiation electrode, a ground electrode provided apart from the radiation electrode, a power supply electrode provided between the radiation electrode and the ground electrode, and electrically connected to the power supply electrode; A power supply unit that supplies power to the power supply electrode, and a side electrode that is electrically connected to the power supply electrode and the power supply unit and that is provided in non-contact with the ground electrode,
An antenna, wherein a dielectric material is provided between the radiation electrode and the power supply electrode and between the power supply electrode and the ground electrode. A first substrate on which a radiation electrode is formed;
A ground electrode and a power supply portion provided in electrical non-contact with the ground electrode, a power supply electrode formed on a second main surface, and the power supply portion and the power supply electrode on a first side surface. 2. The antenna according to claim 1, further comprising a second substrate having a side electrode formed thereon for connecting the first substrate and the second substrate. 3. A first substrate having a radiation electrode formed on a first main surface and a first power supply electrode formed on a second main surface;
A ground electrode and a power supply unit provided in electrical non-contact with the ground electrode are formed on the main surface, a second power supply electrode is formed on the second main surface, and the power supply unit is formed on the first side surface. The antenna according to claim 1, further comprising: a second substrate having a side electrode connected to the power supply electrode. 4. The antenna according to claim 3, wherein the area of the power supply electrode on the first substrate is smaller than the area of the power supply electrode on the second substrate. 5. The antenna according to claim 2, wherein the thickness of the first substrate is larger than the thickness of the second substrate. 6. The method according to claim 2, wherein the area of the main surface of the first substrate is equal to the area of the main surface of the second substrate or the area of the main surface of the second substrate is larger. An antenna according to any one of claims 3 and 5. 7. The method according to claim 2, wherein the area of the main surface of the first substrate is equal to the area of the main surface of the second substrate or the area of the main surface of the second substrate is smaller. An antenna according to any one of claims 3 and 5. 8. The antenna according to claim 2, wherein the first substrate and the second substrate are joined. 9. The antenna according to claim 8, wherein at least one of a glass and a resin bonding material is used as a bonding material for bonding the first substrate and the second substrate. 10. The gap between the first substrate and the second substrate is 1 μm.
The antenna according to any one of claims 8 and 9, wherein the antenna has a thickness of m to 200 µm. 11. The antenna according to claim 2, wherein the relative permittivity εr of the substrate is 6 or more and 150 or less. 12. The antenna according to claim 2, wherein the surface roughness of the substrate is 10 μm or less. 13. A substrate comprising a ceramic,
The sintering density is set to 92% or more.
12. The antenna according to 12. 14. The method according to claim 2, wherein at least one of chamfering and tapering is performed on a corner of the substrate.
3. The antenna according to 3. 15. The antenna according to claim 14, wherein a C chamfering process is adopted as the chamfering process, and a radius of the C chamfering is set to 0.1 mm or more. 16. A ground electrode, wherein a cutout is provided in the ground electrode, a joint provided in non-contact with the ground electrode is provided in the cutout, and the joint and the power supply electrode are joined. Item 16. The antenna according to any one of Items 1 to 15. 17. An electrode material having a resistivity of 1 × 10 ⁻⁴ Ωcm.
The following metal materials are used, and the electrode thickness is 0.01 μm to 50 μm.
17. The antenna according to claim 1, wherein m is m. 18. The antenna according to claim 2, wherein the permittivity of the first substrate is different from the permittivity of the second substrate. 19. An antenna according to any one of claims 1 to 18, a receiving means for demodulating a received signal received by said antenna to generate a data signal, and a first means in which predetermined information is stored in advance. Storage means, second storage means for storing the data signal, transmission means for modulating a data signal from the first and second storage means to generate a transmission signal,
Control means for controlling reception, demodulation, modulation, and transmission of the data. 20. A data communication system for transmitting and receiving information between an on-board machine mounted on a mobile object and a fixed machine installed on the ground, wherein the on-board machine comprises:
Any one of the antennas, receiving means for demodulating a signal from the fixed device received by the antenna to generate a data signal, first storage means in which predetermined information is stored in advance, and Second storage means for storing a signal; transmission means for modulating data signals from the first and second storage means to generate a transmission signal transmitted from the antenna to the fixed machine; Control means for controlling demodulation / modulation and signal transmission / reception, wherein the antenna receives a predetermined signal, modulates the received signal with the receiving means to generate a data signal, and wherein the data signal is If the data signal is a data signal indicating that the data stored in the means is to be transmitted, the control means uses the data stored in the storage means as a transmission signal to the outside via the transmitting means and the antenna. Data transmitting and receiving system for causing delivered. 21. A data communication system for transmitting and receiving information between an on-vehicle device mounted on a vehicle and a on-road device installed on the ground, wherein the on-vehicle device is any one of claims 1 to 18. 1, a receiving unit for demodulating a received signal received by the antenna to generate a data signal, a first storage unit in which predetermined information is stored in advance, and a second storage unit for storing the data signal. Storage means, a transmission means for modulating a data signal from the first and second storage means to generate a transmission signal, and a control means for controlling demodulation and modulation of the data and transmission and reception of the signal, The antenna receives a predetermined signal, modulates the received signal with the receiving unit to generate a data signal, and the data signal is a data signal to transmit data stored in the storage unit. in case of, Data transmission and reception system, characterized in that the serial control means to transmit data stored in the storage means as a transmitted signal to the outside via the antenna and the transmitting means. 22. A first molded body is formed from a predetermined material,
Forming a first substrate by firing the first molded body to form a first fired body, forming a radiation electrode of a predetermined shape on the first fired body, and then performing quenching; A second molded body is formed from a predetermined material, and the second molded body is fired to form a second fired body. At least a radiation electrode and a ground electrode of a predetermined shape are formed on the second fired body. A method for manufacturing an antenna, comprising: forming a second substrate by quenching after forming; and bonding the first substrate and the second substrate via a bonding material.