JP2001196840A - Surface mounted antenna and communication apparatus provided with the antenna - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the symmetry of the directivity of a patch type radiation electrode. SOLUTION: The patch type radiation electrode 3 is formed in the center area of the upper surface 2a of a dielectric substrate 2, and the first microstrip type radiation electrode 11 and the second microstrip type radiation electrode 12 for holding both of the right and left sides of the electrode 3 between them are formed. The electrode 11 and the electrode 12 are symmetrical with the electrode 3 as a center. When the microstrip type radiation electrode is formed only on one of the right and left sides of the electrode 3, the directivity of the electrode 3 becomes asymmetrical due to the effect of the microstrip type radiation electrode. By forming the microstrip type radiation electrodes 11 and 12 on both of the right and left sides of the electrode 3, it is possible to make the directivity of the electrode 3 symmetrical.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface-mounted antenna built in a communication device such as a radio and a communication device provided with the antenna.

[0002]

2. Description of the Related Art FIG. 13 (a) is a perspective view showing an example (not disclosed) of a proposed surface mount antenna proposed by the present inventor, and FIG. An example of the return loss characteristic of the surface mount antenna shown in a) is shown. The surface mount antenna 1 shown in FIG.
A patch-type radiation electrode 3, a microstrip-type radiation electrode 4, and the like are formed on the surface of the dielectric substrate 2, and can transmit and receive radio waves in two different frequency bands as shown in FIG.

[0003] That is, as shown in FIG. 13 (a), a patch-type radiation electrode 3 is provided on the upper surface 2 a of a rectangular parallelepiped dielectric substrate 2.
Are formed, and a microstrip type radiation electrode 4 is formed on the right side of the patch type radiation electrode 3 in FIG. Also, the side surface (front side surface) 2 of the dielectric substrate 2
b, a feed electrode 5 is formed near the patch-type radiation electrode 3 and the microstrip-type radiation electrode 4
Are formed to extend from the upper surface 2a, and further bent to form side surfaces 2a.
It extends toward the power supply electrode 5 along the upper side of b. The feed end 4a of the microstrip type radiation electrode 4 is arranged at an interval from the feed electrode 5. Furthermore, in the example of this figure, the side surface 2b of the dielectric substrate 2
, A fixed electrode 6 is formed at the bottom side corner.

Further, the power supply electrode 5 is formed so as to extend from the side surface 2b to the bottom surface 2f of the dielectric substrate 2, and the bottom surface 2f of the dielectric substrate 2 is substantially excluding the region where the power supply electrode 5 is formed. A ground electrode 7 is formed on the entire surface with an interval from the power supply electrode 5.

Further, the microstrip type radiation electrode 4 has a bottom surface 2f from an upper surface 2a through a side surface (rear side surface) 2d.
To the ground electrode 7 on the bottom surface 2f.
It is connected to the. The extension tip 4b of the microstrip type radiation electrode 4 forms a ground short-circuit end connected to the ground electrode 7 on the bottom surface 2f.

The patch type radiation electrode 3 is of a λ / 2 patch type, is not short-circuited to the ground (in other words, is in a state of floating on the ground), and has a structure as shown in FIG. It is configured to resonate at the resonance frequency f1. Further, the microstrip type radiation electrode 4 is of a λ / 4 microstrip type, as shown in FIG.
It is configured to resonate at a resonance frequency f2 lower than the resonance frequency f1 as shown in FIG.

The surface mount antenna 1 shown in FIG.
Is configured as described above. Such a surface mount antenna 1 is mounted on a circuit board built in a communication device with the bottom surface 2f of the dielectric base 2 as a mounting surface. A signal supply source 8 is formed on the circuit board, and the power supply electrode 5 is electrically connected to the signal supply source 8 when the surface mount antenna 1 is surface-mounted on a predetermined area of the circuit board. Has become.

When a signal is supplied from the signal supply source 8 to the power supply electrode 5, the signal is supplied from the power supply electrode 5 to the patch-type radiation electrode 3 and the microstrip-type radiation electrode 4 by capacitive coupling. Accordingly, the patch-type radiation electrode 3 and the microstrip-type radiation electrode 4 resonate, and transmission and reception of radio waves (signals) are performed.

[0009]

By the way, the present inventor has proposed a surface mount antenna 1 having a patch type radiation electrode 3 and a microstrip type radiation electrode 4 as described above.
As the research and development proceeded, it was found that the following problem occurs in the embodiment shown in FIG.

That is, since the microstrip radiating electrode 4 is short-circuited to the ground, the microstrip radiating electrode 4 is equivalent to the ground with respect to the patch radiating electrode 3. The patch-type radiation electrode 3 desirably has radio wave directivity symmetrical in the figure, but as described above, one of the left and right sides of the patch-type radiation electrode 3 (the right side in the example of FIG. ), The directivity of the patch-type radiation electrode 3 is shifted so as to avoid the microstrip-type radiation electrode 4 and the patch-type radiation electrode 3 There is a problem that the directivity of the image becomes asymmetrical.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide both a patch-type radiation electrode and a microstrip-type radiation electrode, and to provide the directivity of the patch-type radiation electrode. An object of the present invention is to provide a surface mount antenna capable of improving symmetry and a communication device including the antenna.

[0012]

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, the surface-mounted antenna according to the first invention has a dielectric substrate, on the surface of which a patch-type radiation electrode floating from the ground is formed, and on both sides of the patch-type radiation electrode. Means for solving the above-mentioned problem is a configuration in which a first microstrip type radiation electrode and a second microstrip type radiation electrode which are short-circuited to ground via a gap are formed.

A surface mount antenna according to a second aspect of the present invention has the configuration of the first aspect, and the first microstrip type radiation electrode and the second microstrip type radiation electrode are centered on the patch type radiation electrode. It is characterized by being formed symmetrically or substantially symmetrically to each other.

[0014] A surface mounted antenna according to a third aspect of the present invention has the structure of the first or second aspect, wherein the resonance frequency of the first microstrip radiating electrode and the resonance frequency of the second microstrip radiating electrode are different from each other. It is configured to be different from the frequency.

According to a fourth aspect of the present invention, there is provided a surface mount antenna having the configuration of the first, second, or third aspect, wherein the patch-type radiation electrode is configured to be degenerately separated to transmit and receive a circularly polarized radio wave. Is performed.

According to a fifth aspect of the present invention, there is provided a surface mount antenna having the configuration of the first, second, third, or fourth aspect of the invention, and a feeder electrode for a patch-type radiation electrode is formed on a dielectric substrate. In addition, a dedicated power supply electrode is formed on each of the first and second microstrip radiation electrodes, or a common power supply electrode is formed on the first microstrip radiation electrode and the second microstrip radiation electrode. It is configured as a feature.

According to a sixth aspect of the present invention, there is provided a surface mount antenna having the configuration of any one of the first to fifth aspects of the present invention. One or more microstrip radiating electrodes are juxtaposed at intervals, a first microstrip radiating electrode group including a first microstrip radiating electrode and a microstrip radiating electrode near the first microstrip radiating electrode, The second microstrip-type radiation electrode group including the second microstrip-type radiation electrode and the microstrip-type radiation electrode in the vicinity thereof is formed substantially symmetrically with respect to the patch-type radiation electrode. Are characterized in that the resonance frequencies of the microstrip radiating electrodes are different from each other.

According to a seventh aspect of the present invention, there is provided the communication device according to
To a surface mounting antenna according to any one of the first to sixth aspects of the present invention.

In the invention having the above-described structure, the first microstrip type radiation electrode and the second microstrip type radiation electrode are formed on both sides of the patch type radiation electrode, that is, with a gap therebetween so as to sandwich the patch type radiation electrode. Have been.

As described above, the first and second microstrip radiating electrodes equivalent to the ground are disposed on both sides of the patch radiating electrode, so that the directivity of the patch radiating electrode is improved. Can be

[0021]

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

FIG. 1A is a perspective view showing a first embodiment of a surface mount antenna according to the present invention.
FIG. 1B shows the surface-mounted antenna shown in FIG. 1A in an unfolded state. In the description of the first embodiment, the same components as those of the above-mentioned proposal are denoted by the same reference numerals, and redundant description of the common portions will be omitted.

The feature of the first embodiment is that, as shown in FIGS. 1 (a) and 1 (b), the first microelectrode is provided on both left and right sides of the patch type radiation electrode 3 with a gap therebetween. That is, a strip-type radiation electrode 11 and a second microstrip-type radiation electrode 12 are formed. Other configurations are almost the same as those of the above-mentioned proposal example.

As shown in FIGS. 1A and 1B, a patch-type radiation electrode 3 is formed substantially at the center of the upper surface 2a of the dielectric substrate 2. In the first embodiment, a first microstrip-type radiation electrode 11 is provided on the left side of the patch-type radiation electrode 3 in the drawing, and a second microstrip-type radiation electrode 11 is provided on the right side of the patch-type radiation electrode 3 in the drawing. The first microstrip radiation electrode 11 and the second microstrip radiation electrode 12 are formed symmetrically with respect to the patch radiation electrode 3. Have been.

One end of each of the first and second microstrip radiating electrodes 11 and 12 is formed to extend from the upper surface 2a to the side surface (front side surface) 2b, and further bent along the upper side of the side surface 2b. It is formed to extend toward the center. The extending end portions 11a and 12a of the first and second microstrip radiating electrodes 11 and 12 are arranged at intervals from the power supply electrode 5, and a signal is supplied from the power supply electrode 5 by capacitive coupling. It forms a power supply end.

The other end of each of the first and second microstrip-type radiation electrodes 11 and 12 is formed to extend from the upper surface 2a to the bottom surface 2f via the side surface (rear surface) 2d. The first and second microstrip radiating electrodes 11, which are connected to a ground electrode 7,
Twelve ends 11b and 12b are ground short-circuit ends.

In the first embodiment, the first and second microstrip radiating electrodes 11 and 12 have the same resonance frequency, and for example, the patch radiating electrode 3 as shown in FIG. The resonance frequency f2 is different from the resonance frequency f1 of the first embodiment, and the surface-mounted antenna 1 shown in the first embodiment has the same structure as that of the proposed example. It can be transmitted and received.

According to the first embodiment, the first microstrip type radiation electrode 11 and the second microstrip type radiation electrode 12 sandwiching both sides of the patch type radiation electrode 3 are formed. The directivity of the patch-type radiation electrode 3 is left-right asymmetric due to the problem of the example, that is, the microstrip-type radiation electrode equivalent to the ground is formed only on one of the left and right sides of the patch-type radiation electrode 3. Can be substantially avoided.

In particular, in the first embodiment, the first microstrip-type radiation electrode 11 and the second microstrip-type radiation electrode 12 are formed symmetrically with respect to the patch-type radiation electrode 3. Therefore, the influence of the first and second microstrip-type radiation electrodes 11 and 12 on the directivity of the patch-type radiation electrode 3 is substantially the same on the left and right sides of the patch-type radiation electrode 3. Can be made almost symmetrically.

In the example shown in FIG. 1, the first and second
Although the ground short-circuited ends 11b and 12b of the microstrip-type radiation electrodes are separately connected to the ground electrode 7, for example, as shown in FIG. An electrode 13 is formed, and the ground short-circuited ends 11b and 12b are connected in common to the electrode 13, respectively, and the first and second microstrip-type radiation electrodes 11 and 12 are connected to the ground electrode 7 via the electrode 13. May be short-circuited.

Further, as shown in FIG.
An E-shaped electrode 14 is formed on each of the first and second microstrip radiating electrodes 11, 12 via the electrode 14, and the ground short-circuited ends 11b and 12b are commonly connected to the electrode 14, respectively. 12 may be short-circuited to the ground electrode 7.

Further, in the example shown in FIG. 1, the first and second microstrip-type radiation electrodes 11 and 12 are connected to the ground electrode 7 through the side surfaces 2d, respectively. As shown, the first microstrip type radiation electrode 11 is moved from the upper surface 2a to the side surface (left side surface) 2e.
The second microstrip radiating electrode 12 extends from the top surface 2a to the bottom surface 2f via the side surface (right side surface) 2c to extend to the ground electrode 7 and connect to the ground electrode 7. You may connect. Note that FIG.
In the example shown in FIG. 1, the fixed electrode 6 is formed on the bottom side of the side surface 2d.

In the examples shown in FIGS. 2 (a) and 2 (b) and FIG. 3, as in FIG.
Microstrip-type radiation electrodes 11 on the left and right sides of
And the formation of the second microstrip-type radiation electrode 12, an effect of improving the symmetry of the directivity of the patch-type radiation electrode 3 can be obtained.

Hereinafter, a second embodiment will be described. In the description of the second embodiment, the same components as those of the first embodiment are denoted by the same reference numerals, and the description of the common portions will not be repeated.

A characteristic of the second embodiment is that the resonance frequency of the first microstrip type radiation electrode 11 and the resonance frequency of the second microstrip type radiation electrode 12 are different. Other configurations are almost the same as those of the first embodiment.

Incidentally, in the microstrip type radiation electrode, for example, the first microstrip type radiation electrode 11 (the second microstrip type radiation electrode 12)
The inductance component of the microstrip-type radiation electrode changes according to the current path length from the power supply end 11a (12a) to the ground short-circuit end 11b (12b) and the thickness of the current path, and the resonance frequency changes. Change. Specifically, for example, as the current path length becomes longer or the current path becomes thinner, the microstrip-type radiation electrode changes in a direction in which the inductance component increases, and changes in a direction in which the resonance frequency decreases.

An open end (eg, an open end 11c of the first microstrip type radiation electrode 11 shown in FIG. 4) which is an end facing the ground with a space therebetween.
Or the open end 12c of the second microstrip type radiation electrode 12) and the ground (the fixed electrode 6 in the example shown in FIG. 4).
The capacitance between the open end and the ground changes in accordance with the distance (D1 (D2)) between the two, and the resonance frequency of the microstrip radiating electrode changes. Specifically, as the capacitance between the open end and the ground decreases,
The resonance frequency of the microstrip-type radiation electrode changes in a higher direction.

In the second embodiment, the resonance frequency f11 of the first microstrip radiating electrode 11 and the resonance frequency f2 of the second microstrip radiating electrode 12 are utilized by utilizing the properties of the microstrip radiating electrode. The frequency f12 is different.

That is, in the example shown in FIG. 4, the structure is substantially the same as the structure shown in FIG. 1, but the second microstrip type radiation electrode 11 has a smaller area than the electrode area of the side surface 2d. The electrode area of the side surface 2d portion of the second microstrip type radiation electrode 12 is reduced by the presence of the chip K (that is, the current path is narrowed). For this reason, the second microstrip-type radiation electrode 12 has a larger inductance component than the first microstrip-type radiation electrode 11, and the resonance frequency f12 of the second microstrip-type radiation electrode 12 is equal to the first microstrip-type radiation electrode. It is lower than the resonance frequency f11 of the electrode 11 (in other words, the resonance frequency f11 of the first microstrip type radiation electrode 11 is higher than the resonance frequency f12 of the second microstrip type radiation electrode 12). Has become.)

In the example shown in FIG. 5A, the first microstrip radiating electrode 11 is connected to the ground electrode 7 via the side surface 2e, and the second microstrip radiating electrode 12 is connected to the side surface 2e. Ground electrode 7 via 2d
It is connected to the. Otherwise, the configuration is the same as that shown in FIG. The first microstrip type radiation electrode 11 has a smaller inductance component than the second microstrip type radiation electrode 12 due to the difference in the formation position of the ground short-circuit ends 11b and 12b. Resonance frequency f of strip-type radiation electrode 11
Numeral 11 is higher than the resonance frequency f12 of the second microstrip type radiation electrode 12.

Further, in the example shown in FIG. 5B, the structure is substantially the same as the structure shown in FIG. 1, but the feeding end 11a of the first microstrip type radiation electrode 11 is the second structure.
Feed end 12a of the microstrip type radiation electrode 12 of FIG.
Rather than the power supply electrode 5. As a result, the current path length of the first microstrip radiating electrode 11 is shorter than the current path length of the second microstrip radiating electrode 12, and the inductance component of the first microstrip radiating electrode 11 is the second. It is smaller than the inductance component of the microstrip type radiation electrode 12. Therefore, as described above, the resonance frequency f11 of the first microstrip type radiation electrode 11 is higher than the resonance frequency f12 of the second microstrip type radiation electrode 12.

Further, the example shown in FIG. 5 (c) is almost the same as the structure shown in FIG. 1, but is different from the first microstrip type radiation electrode 11 in the example shown in FIG.
The distance D1 between the open end 11c of the second microstrip type radiation electrode 12 and the fixed electrode 6 is wider than the distance D2 between the open end 11c and the fixed electrode 6.
Thereby, the first microstrip type radiation electrode 11
The capacitance between the open end 11c and the fixed electrode 6 (ground) is smaller than the capacitance between the open end 12c of the second microstrip type radiation electrode 12 and the fixed electrode 6 (ground). The resonance frequency f11 of the first microstrip radiating electrode 11 is higher than the resonance frequency f12 of the second microstrip radiating electrode 12.

In the second embodiment, the resonance frequency f11 of the first microstrip radiating electrode 11 and the resonance frequency f12 of the second microstrip radiating electrode 12 are different from each other as described above. The first and second microstrip-type radiating electrodes 1 and 2 utilizing the inductance components of the first and second microstrip-type radiating electrodes 11 and 12 and the capacitance between the open end and the ground.
By appropriately setting the difference Δf between the resonance frequencies f11 and f12 of the surface mount antennas 1 and 12, the surface-mount antenna 1 has a return loss characteristic as shown in FIG. 6A and a return loss as shown in FIG. One of the loss characteristics can be alternatively provided.

That is, by reducing the difference Δf between the resonance frequencies f11 and f12, as shown in FIG. 6 (a), a multiple resonance state occurs in the lower frequency band, and the frequency band is broadened. Can be planned.

The difference Δf between the resonance frequencies f11 and f12
Is expanded, three frequency bands are formed as shown in FIG. 6 (b), and multi-channeling can be achieved.

According to the second embodiment, the first
The first microstrip type radiation electrode 11 and the second microstrip type radiation electrode 12
Are formed substantially symmetrically with respect to the patch-type radiation electrode 3, so that the patch-type radiation electrode 3 can be provided with symmetrical directivity similarly to the first embodiment.

In addition, in the second embodiment, the first embodiment
Resonance frequency f11 of the microstrip type radiation electrode 11 of FIG.
And the resonance frequency f12 of the second microstrip type radiation electrode 12 is different.
By appropriately setting the difference Δf between 1 and f12, it is possible to widen the frequency band, and to achieve multiplexing capable of having three or more frequency bands for radio wave transmission and reception. As described above, the deployment according to the use of the surface mount antenna 1 or the like becomes easy.

Hereinafter, a third embodiment will be described. In the description of the third embodiment, the same components as those of the above embodiments are denoted by the same reference numerals, and the overlapping description of the common portions will be omitted.

The feature of the third embodiment is that a second power supply electrode 15 is provided as shown in FIG. 7 in addition to the configuration of each of the above embodiments. The second power supply electrode 15 is provided on the side surface 2 d of the dielectric substrate 2.
Are formed in the area near the patch-type radiation electrode 3. The second power supply electrode 15 is formed so as to extend from the side surface 2d to the bottom surface 2f.
Is not short-circuited. When a signal is supplied from the outside, the second power supply electrode 15 can supply the signal to the patch-type radiation electrode 3 by capacitive coupling.

For example, in a communication device capable of transmitting and receiving radio waves in two different frequency bands, FIG.
There are a type having the configuration shown in FIG. 8A and a type having the configuration shown in FIG.

That is, the communication device as shown in FIG. 8A has a DUP (Duplexer (radio wave separating unit)) 16, a system unit 17 for the low frequency side, and a system unit 18 for the high frequency side. For example, when the surface-mounted antenna 1 as shown in FIG. 1 is mounted, the power supply electrode 5 of the surface-mounted antenna 1 is connected to the low-frequency side system unit 17 and the high-frequency side Is connected to the system section 18. For example, based on the radio wave received by the surface mount antenna 1, a signal on the low frequency side or a signal on the high frequency side is extracted by the DUP 16, and the signal on the low frequency side is sent to the system section 17 for the low frequency side. The signal is transmitted and processed, and the signal on the high frequency side is transmitted to the system section 18 for the high frequency side to be processed.

A communication device as shown in FIG. 8 (b) does not have the DUP 16, and generally has an antenna having a single frequency band for radio wave transmission and reception in the low frequency side. And the high frequency side are prepared and mounted. The antenna for the low frequency side is in the system section 17 for the low frequency band, and the antenna for the high frequency side is in the system section 18 for the high frequency band. Each is directly connected.

In the third embodiment, since the second power supply electrode 15 is provided in addition to the power supply electrode 5 as described above, the surface mount antenna 1 of the third embodiment is provided.
Can be mounted on both the communication device of the type shown in FIG. 8A and the communication device of the type shown in FIG. 8B.

That is, when the surface mount antenna 1 shown in FIG. 7 is mounted on the communication device shown in FIG.
As described above, the feeding electrode 5 of the surface mount antenna 1 is DU
The second power supply electrode 1 is connected to the low frequency side system section 17 and the high frequency side system section 18 via P16.
5 is in an unused state without being connected to any of them. Thus, the power supply electrode 5 functions as a power supply electrode common to the patch-type radiation electrode 3, the first microstrip-type radiation electrode 11, and the second microstrip-type radiation electrode 12.

When the surface mount antenna 1 shown in FIG. 7 is mounted on the communication device shown in FIG. 8B, for example,
As shown by the dotted line in FIG.
The power supply electrode 5 is connected to the system unit 17 for the low frequency side, and the second power supply electrode 15 is connected to the system unit 18 for the high frequency side. Thus, the power supply electrode 5 functions as a power supply electrode common to the first microstrip type radiation electrode 11 and the second microstrip type radiation electrode 12, and the second power supply electrode 15 functions as a power supply for the patch type radiation electrode. Functions as an electrode.

According to the third embodiment, by providing the second power supply electrode 15 in addition to the configuration of each of the above-described embodiments, the surface-mount antenna 1 is shown in FIG. Not only such a communication device but also a communication device in which the DUP 16 is omitted as shown in FIG. In other words, even in a communication device in which the DUP 16 is omitted, only one surface-mount antenna needs to be mounted, so that the size of the communication device can be reduced.

The surface mount antenna 1 is configured to transmit and receive radio waves in three different frequency bands (that is,
In the case of having the configuration as shown in the second embodiment), a feed electrode for the patch-type radiation electrode 3;
By providing three power supply electrodes, the power supply electrode for the first microstrip type radiation electrode 11 and the power supply electrode for the second microstrip type radiation electrode 12, the DUP 16 as described above is omitted, and It can be mounted on a communication device capable of communication in three different frequency bands.

Hereinafter, a fourth embodiment will be described. In the description of the fourth embodiment, the same components as those of the above embodiments are denoted by the same reference numerals, and the description of the common portions will not be repeated.

The characteristic feature of the fourth embodiment is that the patch-type radiation electrode 3 has a form of degenerate separation as shown in FIGS. 9 (a) and 9 (b). Other configurations are the same as those of the above embodiments.

That is, the patch-type radiation electrode 3 is
As shown in (a), the lengths of the diagonal resonance vectors α and β have different shapes and are degenerately separated. Thus, the patch-type radiation electrode 3 transmits and receives circularly polarized radio waves. Various forms of degenerate separation are conceivable. Needless to say, the patch-type radiation electrode 3 is not limited to the forms shown in FIGS. 9A and 9B.

According to the fourth embodiment, since the patch-type radiation electrode 3 is configured to be degenerated and separated, transmission and reception of circularly polarized radio waves are performed by the patch-type radiation electrode 3. The first and second microstrip radiating electrodes 11 and 12 transmit and receive linearly polarized radio waves. Thus, it is possible to provide the surface-mounted antenna 1 capable of transmitting and receiving two types of radio waves, that is, circularly polarized waves and linearly polarized waves.

Hereinafter, a fifth embodiment will be described. In the fifth embodiment, an example of a communication device will be described. The communication device shown in the fifth embodiment is a wireless device 30 as shown in FIG. A circuit board 32 is built in a case 31 of the wireless device 30. A characteristic of the wireless device 30 is that the surface mount antenna 1 shown in each of the first to fourth embodiments is different from that of the first embodiment. Either one of them is mounted on the circuit board 32.

The circuit board 32 of the wireless device 30 has a structure shown in FIG.
As shown in FIG. 0, the DUP 16, a system section 17 for the low frequency side, and a system section 18 for the high frequency side are formed. The surface mount antenna 1 is mounted on the circuit board 32, and the low frequency system 17 and the high frequency system 1 are connected via the DUP 16.
8 is electrically connected. In this wireless device 30, transmission and reception of radio waves in two different frequency bands are performed simply by mounting one surface mount antenna 1.

According to the fifth embodiment, the radio 3
0 is equipped with the surface-mounted antenna 1 having the specific configuration shown in each of the above embodiments, so that transmission and reception of radio waves in two different frequency bands can be performed only by providing one surface-mounted antenna 1. Can be. In addition, since the directional symmetry of the patch-type radiation electrode 3 is good, it is possible to provide a communication device with high reliability of antenna characteristics.

Note that, in the example shown in FIG.
0, the DUP 16 is formed, but the power supply electrode 5 and the second power supply electrode 15 as shown in the third embodiment.
In the case of using the surface mount antenna 1 provided with the DUP 16, the DUP 16 can be omitted as described in the third embodiment.

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 first microstrip type radiation electrode 11 and the second
Are formed symmetrically or substantially symmetrically with respect to the patch-type radiation electrode 3, but the first and second microstrip-type radiation electrodes 1
The patches 1 and 12 need only be formed on both sides of the patch-type radiation electrode 3 so as to sandwich the patch-type radiation electrode 3, and need not be formed symmetrically or substantially symmetrically around the patch-type radiation electrode 3. In this case, the symmetry of the directivity of the patch-type radiation electrode 3 can be improved as compared with the case where only one microstrip-type radiation electrode as shown in FIG. 13 is used.

In each of the above embodiments, one microstrip-type radiation electrode is formed on each of the left and right sides of the patch-type radiation electrode 3. For example, as shown in FIG. Microstrip-type radiation electrode group 20 composed of
May be formed on both sides of the patch-type radiation electrode 3.

In this case, the first microstrip-type radiation electrode group 20 and the second microstrip-type radiation electrode group 21 are formed substantially symmetrically with respect to the patch-type radiation electrode 3.

The resonance frequencies of the plurality of microstrip-type radiating electrodes constituting the first and second microstrip-type radiating electrode groups 20 and 21 are adjusted to the properties described in the second embodiment. It is possible to transmit and receive radio waves in many frequency bands of three or more by appropriately setting the frequency band, or to create a multi-resonant state such as double or triple to widen the frequency band. Various developments can be achieved as if it were possible.

Note that the first microstrip type radiation electrode group 20 and the second microstrip type radiation electrode group 21 are substantially symmetrical when the first microstrip type radiation electrode group 20 and the second microstrip type Radiation electrode group 21
When there are a large number of microstrip radiating electrodes constituting the respective microstrip radiating electrodes and the microstrip radiating electrodes are fine, the number of the microstrip radiating electrodes in the first microstrip radiating electrode group 20 and the This includes the case where the number of microstrip type radiation electrodes in the two microstrip type radiation electrode groups 21 is slightly different.

Further, in each of the above embodiments, the dielectric substrate 2 has a rectangular parallelepiped shape. However, the shape of the dielectric substrate 2 is not limited to a rectangular parallelepiped shape, and can take various forms. For example, as shown in FIG. 12, the dielectric substrate 2 may have a columnar shape. Also in this case, similarly to the above embodiments, the patch-type radiation electrode 3 is formed at the center of the upper surface 2a of the dielectric substrate 2, and the first microstrip radiation electrode 11 and the second microstrip radiation Electrodes 12 are formed on both sides of the patch-type radiation electrode 3. Also in this case, similarly to the above embodiments, the symmetry of the directivity of the patch-type radiation electrode 3 can be improved.

Further, in the fifth embodiment, a wireless device has been described as an example of a communication device.
The present invention can be applied to communication devices other than wireless devices.

[0073]

According to the present invention, since a patch-type radiation electrode and a microstrip-type radiation electrode are provided, a single surface-mount antenna can transmit and receive radio waves in two or more different frequency bands from each other. It is possible. The first microstrip type radiation electrode and the second microstrip type radiation electrode are formed on both sides of the patch type radiation electrode with a gap therebetween, so that the microstrip type radiation electrode equivalent to the ground is formed. The influence is substantially equally applied to both sides of the patch-type radiation electrode, and it is possible to obtain good symmetry of the directivity of the patch-type radiation electrode.

In the case where the first microstrip type radiation electrode and the second microstrip type radiation electrode are formed symmetrically or substantially symmetrically with respect to the patch type radiation electrode, the directivity of the patch type radiation electrode is set. Sex symmetry can be further improved.

If the resonance frequency of the first microstrip radiation electrode is different from the resonance frequency of the second microstrip radiation electrode, the first and second microstrip radiation electrodes are different.
By creating a multiple resonance state by reducing the difference between the resonance frequencies of the respective microstrip radiating electrodes, it is possible to widen the frequency band by the first and second microstrip radiating electrodes.

By increasing the difference between the resonance frequencies of the first and second microstrip radiating electrodes,
In addition to the frequency band of the patch-type radiation electrode, a frequency band of the first microstrip-type radiation electrode and a frequency band of the second microstrip-type radiation electrode different from the frequency band are formed. With one surface-mounted antenna, transmission and reception of radio waves in three different frequency bands can be performed, and the surface-mounted antenna can be multiplied.

When the patch-type radiation electrode is configured to transmit and receive circularly polarized radio waves in a degenerate form, the patch-type radiation electrode can transmit and receive circularly polarized radio waves, and the microstrip radiation Since electrodes can transmit and receive linearly polarized radio waves, a surface-mounted antenna that can transmit and receive two types of radio waves, that is, circularly polarized waves and linearly polarized waves, can be provided.

A feed electrode for a patch type radiation electrode is formed, and a dedicated feed electrode or a first microstrip type radiation electrode and a second microstrip type are respectively provided for the first and second microstrip type radiation electrodes. In a surface mount antenna in which a common power supply electrode is formed on a radiating electrode, not only a communication device having a radio wave separation unit (DUP) but also a communication device in which the radio wave separation unit is omitted. This makes it possible to increase the types of communication devices that can be mounted, thereby expanding the applicable range. Further, in the related art, a communication device that can transmit and receive a plurality of different frequency bands and does not include the radio wave separation unit needs to prepare antennas according to the number of frequency bands that can be transmitted and received. Although it was difficult to reduce the size, it was incorporated into the communication device by using a surface-mounted antenna according to the present invention in which a feed electrode for the patch-type radiation electrode and a feed electrode for the microstrip-type radiation electrode were separately provided. The number of antennas can be reduced, and the size of the communication device can be easily reduced.

In the case where the first microstrip type radiating electrode group and the second microstrip type radiating electrode group are formed on both sides of the patch type radiating electrode, the The symmetry of the directivity can be improved, and the resonance frequencies of a large number of microstrip radiating electrodes constituting the first and second microstrip radiating electrode groups can be appropriately set.
It is possible to achieve multi-mode transmission and reception of radio waves in two or more different frequency bands, or to create a multi-resonance state to widen the frequency band, and various developments are possible.

According to the communication apparatus having the characteristic surface mount antenna according to the present invention, it is possible to provide a communication apparatus having high reliability of antenna characteristics.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a first embodiment of a surface mount antenna according to the present invention.

FIG. 2 is an explanatory diagram showing a modification of FIG. 1;

FIG. 3 is an explanatory view showing a modification of FIG. 1;

FIG. 4 is a diagram for explaining a second embodiment.

FIG. 5 is a diagram for explaining a second embodiment example.

FIG. 6 is an explanatory diagram showing an example of a return loss characteristic of the surface mount antenna shown in the second embodiment.

FIG. 7 is an explanatory diagram showing a third embodiment.

FIG. 8 is an explanatory diagram illustrating a configuration example of a communication device capable of mounting the surface mount antenna according to the third embodiment.

FIG. 9 is a diagram for explaining a fourth embodiment.

FIG. 10 is a model diagram illustrating an example of a communication device.

FIG. 11 shows a first microstrip type radiation electrode group 20.
FIG. 3 is an explanatory diagram showing an example of a surface-mount antenna in which a second microstrip radiation electrode group 21 is formed.

FIG. 12 is an explanatory diagram showing another embodiment.

FIG. 13 is an explanatory diagram showing a proposed example of a surface mount antenna proposed by the present applicant.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Surface mount type antenna 2 Dielectric substrate 3 Patch type radiation electrode 5 Feeding electrode 7 Ground electrode 11 1st microstrip type radiation electrode 12 2nd microstrip type radiation electrode 15 2nd power supply electrode 20 1st microstrip -Type radiation electrode group 21 Second microstrip-type radiation electrode group 30 Radio

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5J045 AA21 BA01 CA04 DA09 DA10 EA07 FA02 GA03 HA03 NA03 5J046 AA04 AB13 PA07 5J047 AA04 AB13 FD01

Claims (7)

[Claims] 1. A dielectric substrate having a patch-type radiating electrode formed on the surface of the dielectric substrate and floating from the ground, and short-circuited to the ground via a gap on both sides of the patch-type radiating electrode. A first microstrip radiating electrode and a second microstrip radiating electrode are formed. 2. The device according to claim 1, wherein the first microstrip radiation electrode and the second microstrip radiation electrode are formed symmetrically or substantially symmetrically with respect to the patch radiation electrode. Surface mount antenna. 3. The surface-mounted antenna according to claim 1, wherein a resonance frequency of the first microstrip type radiation electrode is different from a resonance frequency of the second microstrip type radiation electrode. . 4. The surface-mounted antenna according to claim 1, wherein the patch-type radiation electrode is configured to degenerate and separate, and transmits and receives circularly polarized radio waves. 5. A feed electrode for a patch-type radiation electrode is formed on a dielectric substrate, and a dedicated feed electrode or a first microstrip-type radiation is provided for each of the first and second microstrip-type radiation electrodes. 4. A common power supply electrode is formed between the electrode and the second microstrip radiation electrode.
Or the surface mount type antenna according to claim 4. 6. One or more microstrip radiating electrodes are juxtaposed in the vicinity of each of the first and second microstrip radiating electrodes with a space therebetween. And a second microstrip type radiating electrode group including a second microstrip type radiating electrode and a microstrip type radiating electrode in the vicinity thereof. 2. The device according to claim 1, wherein the plurality of microstrip-type radiation electrodes have different resonance frequencies from each other with respect to the patch-type radiation electrode.
A surface-mounted antenna according to claim 1. 7. A communication device comprising the surface-mount antenna according to claim 1. Description: