JP3006399B2 - Dual band antenna - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dual band antenna for receiving and transmitting two frequencies.

[0002]

2. Description of the Related Art At present, many telecommunication systems put into practical use are required to operate corresponding to a large number of frequencies.

[0003] For example, a position detection system (hereinafter referred to as G) for a wide-ranging moving object implemented by the US government.
PS) is a system that communicates with satellites, and electromagnetic waves communicate via the ionosphere, so that some delay occurs in the ionosphere. Since this delay occurs in a frequency dependent manner, it was necessary to respond to two frequencies to compensate for the delay. Former USSR GL for similar reasons
The ONASS position detection system also used two frequencies. The wireless LAN system uses three frequencies for control and data communication.

However, using a large number of frequencies is
A large number of antennas are required, and the transmitter or receiver has a problem in that the space on the aircraft where the antennas are to be placed is limited.

[0005] As the antenna used in the telecommunication system described above, a miniaturized antenna has been demanded, and a planar antenna has been used. A typical example of this planar antenna is a microstrip antenna (Microstri
p antenna (hereinafter, referred to as MSA).

The MSA is a light and extremely small planar antenna because the radiation system and the feed system can be integrally formed in a plane. FIG. 3 is a top view of an antenna for receiving and transmitting two frequencies (hereinafter, referred to as a dual band antenna), which is one of the MSAs. Is formed by etching or the like. FIG. 4 is a cross-sectional view of the dual band antenna shown in FIG. 3 taken along line BB in FIG. The dual band antenna includes first and second opposing surfaces (101) and (102) on the front and back of a substrate (103) formed of a low dielectric constant material.
A first conductor (104) is formed as a radiating element on the first surface (101), and a second conductor (105) is formed inside the substrate (103). 10
In 2), a ground conductor (106) is formed. Further, the first and second conductors (104) (105) are electrically insulated from each other, and these two layers operate independently. The first and second conductors (104)
(106) includes first and second feeder lines (111) and (112) each formed of a coaxial cable or a semi-rigid cable.
Are connected, and these feeder lines (111) (112)
Is insulated from other conductors by an insulating film (109) as shown. The feeder line (110) of the feeder lines (111) and (112) is connected to the first and second conductors (10).
4) First and second conductors (104) connected to feed points (107) and (108) on (105) and being radiating elements
(105) is excited.

Further, the MSA can be manufactured by the same manufacturing method as a general printed circuit board, a radiation system and a feed system can be integrally formed on the same plane, mass production is possible, and the manufacturing cost is low. It is. In addition, since it is in a low attitude, it can be used in a wide band of frequencies from 100 MHz to 50 GHz. The antenna can also be used as a linearly and circularly polarized antenna of electromagnetic waves or a dual-polarization antenna capable of switching polarization. Further, by arbitrarily selecting the position of the feeding point, matching can be achieved over a wide impedance.

However, MSA generally has an unloaded Q
, The frequency range (same meaning as the bandwidth) is narrow, and when the voltage standing wave ratio (VSWR) is 3, the frequency range is 1
It is a narrow range below 0 MHz. Further, the gain depends on the impedance loss of the material, and is 20 dB or less on average. Further, it is necessary to reliably insulate the feed system and the radiation system from the viewpoint of the structure.

In particular, in the above dual band antenna,
Although the two frequencies are used with a difference of at least 10-20%, the characteristics of the antenna are
And the first and second conductors (104) and (105). Therefore, in order to obtain two desired frequencies, the material of the substrate (103), its thickness, and the first And the area of the second conductors (104) (105) must be accurately calculated and designed and manufactured with great care.

The frequency of the antenna composed of the first conductor (104) can be adjusted by removing the first conductor (104) even after the manufacture.
Adjustment of the frequency of the antenna constituted by the second conductor (105) has a problem that it cannot be adjusted after manufacturing because the second conductor (105) is embedded in the substrate (103).

[0011]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object the following:
An object of the present invention is to provide a dual-band antenna that can be manufactured without paying particular attention to the incorporation of a conductor or the like at the time of manufacture and that can easily be tuned to a desired frequency after the conductor is incorporated.

Still another object of the present invention is to construct an antenna system using the dual band antenna.

[0013] The objects according to claims 3 to 6 are as follows.
Another object of the present invention is to obtain a polarized wave for exciting a conductor according to the shape of the second conductor or the first ground conductor according to the shape of the second conductor or the first ground conductor.

Another object of the present invention is to provide an optimum dielectric material capable of obtaining a desired frequency.

It is an object of the present invention to provide an optimum position of a feeding point at which a desired frequency can be obtained.

A further object of the present invention is to form an antenna easily and rationally as in the case of manufacturing a printed wiring board, and to have an optimum shape for receiving two different frequencies. Another object of the present invention is to provide a dual-band antenna capable of easily tuning to a desired frequency.

The objects according to claims 10 and 11 are as follows.
It is an object of the present invention to provide an optimal means for conducting a ground conductor formed on both sides.

The objects according to claims 12 to 15 are as follows.
An object of the present invention is to provide an optimum feeding path for two antennas.

A further object of the present invention is to provide an optimum means for conducting the first and second conductors.

The objects according to claims 17 and 18 are as follows.
It is an object of the present invention to provide an optimal means for easily tuning to a desired frequency.

The objects according to claims 19 and 20 are as follows.
An object of the present invention is to provide an optimal position of a feeding point at which a desired frequency can be obtained.

The objects according to claims 21 and 22 are as follows.
An object of the present invention is to construct an antenna system using the above-described dual band antenna.

The objects according to claims 23 to 26 are as follows.
An object of the present invention is to obtain an appropriate polarized wave for exciting the conductor according to the shape of the first and second conductors or the first grounded conductor.

An object of claim 27 is to provide an optimum dielectric material capable of obtaining a desired frequency.

[0025]

According to a first aspect of the present invention, there is provided a dual band antenna for receiving a first microwave and a second microwave having a frequency different from that of the first microwave. This antenna is made of a dielectric material having a desired thickness, and has a first and a second surface.
A substrate (3) having a surface (1) and a second surface (2) of
A first ground conductor (4) made of a conductive material formed on a first surface (1) of the substrate (3); a first ground formed on the first surface (1); A ring-shaped first conductor (5) surrounding the conductor (4) and the insulator (27) at a constant interval, and the substrate (3);
And is opposed to the first ground conductor (4), is insulated from the first ground conductor (4), and is electrically connected to the annular first conductor (5). A second conductor (6), and the second surface formed on the second surface (2).
And a second grounded conductor (7) insulated from the conductor (6).

A dual band antenna according to a second aspect of the present invention is the dual band antenna according to the first aspect, wherein the second conductor (6) comprises: a receiver for receiving the first microwave; It is characterized by being used by being connected to a receiver for receiving microwaves.

In a dual band antenna according to a third aspect of the present invention, in the dual band antenna according to the first or second aspect, the second conductor is substantially rectangular or polygonal. It is characterized by being.

A dual band antenna according to a fourth aspect of the present invention is the dual band antenna according to the first or second aspect, wherein the second conductor is substantially circular or elliptical. It is characterized by being.

A dual band antenna according to a fifth aspect of the present invention is the dual band antenna according to any one of the first to third aspects, wherein a circumference and an outer contour of the annular first conductor (5) are provided. Is similar to the first grounded conductor (4).

A dual band antenna according to a sixth aspect of the present invention is the dual band antenna according to the first aspect, wherein the first ground conductor (4) and the second conductor (6) are substantially the same. It is characterized by being a shape.

The dual band antenna according to claim 7 of the present invention is the dual band antenna according to claim 1, wherein the dielectric material of the substrate (3) is epoxy resin, polyimide resin, polyfluoroethylene resin, alumina,
It is a magnesium titanate-based ceramic or a polyphenylene oxide resin.

The dual band antenna according to claim 8 of the present invention is the dual band antenna according to claim 1 or 1, wherein the feeding points (19) and (20) are on a diagonal line of the second conductor (6). It is characterized by having.

According to a ninth aspect of the present invention, there is provided a dual band
The antenna combines the first microwave with the first microwave.
With an antenna that receives a second microwave at a different frequency
And this antenna receives the second microwave
Cavity receiving patch antenna and first microwave
Antenna and the cavity antenna,
 It is made of a dielectric material having a desired thickness, and
Having a first surface (1) and a second surface (2) to form
The substrate (3), on the first surface (1) of the substrate (3)
First grounded conductor made of conductive material formed
(4) The above-mentioned first surface (1), which is formed on the above-mentioned first surface (1).
A first ground conductor (4);InsulatorVia (27), constant
An annular first conductor (5) surrounding at intervals of
 The first grounding conductor embedded in the substrate (3);
(4), and is insulated from the first ground conductor (4).
And is electrically connected to the first annular conductor (5).
A second conductor (6) and a patch antenna
Is An annular first conductor formed on the first surface (1);
An electric conductor (5) and a second electric conductor (5) electrically connected to the first electric conductor (5).
A conductor (6) of Formed on the second surface (2);
A second conductor electrically connected to the annular first conductor (5)
(6) and a second ground conductor (7) cooperating therewith.
And these antennas are provided.

A dual band antenna according to a tenth aspect of the present invention is the dual band antenna according to the ninth aspect, wherein the first ground conductor (4) and the second ground conductor (7) are connected to a ground line ( 28).

The dual band antenna according to claim 11 of the present invention is the dual band antenna according to claim 10, wherein the ground line (28) is a via hole (29) penetrating the substrate (3). Features.

A dual band antenna according to a twelfth aspect of the present invention is the dual band antenna according to the ninth aspect, wherein the second conductor (6) is connected to the first feed line (3).
0), this first feed line (30) extends through the substrate (3) from the first feed point (19) on the second conductor (6) to the second surface (2). ), The first terminal (31) is insulated from the second grounding conductor (7), and is further connected to the first conductor (5). ) Is connected to a second feed line (32), which is connected to the second feed point (20), and which is connected to the second feed line (32). A second ground conductor (7) extending from the second feeding point (20) through the substrate (3) to the second terminal (33) and formed on the second surface (2). ) Is formed insulated from
An opening (34) is formed in the center of the second conductor (6), and the first feeding point (19) and the first feeding path (30) are shifted from the opening (34). And the second
Is also displaced from the aperture (34), and the second power supply path (32) passes through the branch line (35) penetrating the substrate (3) and the inside of the aperture (34). It is characterized by comprising a central line (34) penetrating therethrough and a connecting line (37) connecting the branch line (35) and the central line (36).

A dual band antenna according to a thirteenth aspect of the present invention is the dual band antenna according to the ninth aspect, wherein at least one of the first feeding path (30), the branch path (35) and the center line (36) is provided. One or more are via holes penetrating the substrate (3).

A dual band antenna according to a fourteenth aspect of the present invention is the dual band antenna according to the twelfth aspect, wherein the connection line (37) is formed of the first ground conductor (4). The connection line (37) is formed on the surface (1) and is insulated from the first ground conductor (4).

A dual band antenna according to a fifteenth aspect of the present invention is the dual band antenna according to the twelfth aspect, wherein the connection wire (37) covers the first ground conductor (4), and The dual band antenna according to claim 12, wherein the dual band antenna is formed on an insulating layer (38) formed on the substrate (3).

A dual band antenna according to a twelfth aspect of the present invention is the dual band antenna according to the twelfth aspect, wherein the inner circumference of the annular first conductor (5) and the outer circumference of the second conductor (6) are provided. A large number of conductive paths (8) that conduct through are via holes (39).

A dual band antenna according to a seventeenth aspect of the present invention is the dual band antenna according to the ninth aspect, wherein the first annular conductor (5) is integrated with at least the first allowance (40). The first allowance (40) is formed to be exposed on the first surface (1) of the substrate (3), and the first allowance (40) receives a desired frequency of the patch antenna. It is characterized in that it is partially used separately for transmission.

The dual band antenna according to claim 18 of the present invention is the dual band antenna according to claim 9, wherein the first ground conductor (4) is integrated with at least one second allowance (41). The second allowance (41) is formed so as to be exposed on the first surface (1) of the substrate (3), and protrudes toward the annular first conductor (5). In order to receive and transmit a desired frequency of the cavity antenna, the cavity antenna is partially separated and used.

A dual band antenna according to a twelfth aspect of the present invention is the dual band antenna according to the twelfth aspect, wherein the first and second feeding points are provided.
Are formed on the second conductor (6) in the same plane.

According to a twelfth aspect of the present invention, in the dual band antenna of the twelfth aspect, the second conductor (6) is substantially rectangular, and the first and second conductors (6) are substantially rectangular. The power supply points (19) and (20) are arranged along one diagonal line of the second conductor (6).

A dual band antenna according to a twenty-first aspect of the present invention is the dual band antenna according to the twelfth aspect, wherein the first microwave receiving the first microwave connected to the second conductor (6) is provided. It is characterized in that it is used by being connected to a receiver and a second receiver for receiving a second microwave.

A dual band antenna according to a twenty-second aspect of the present invention is the dual band antenna according to the twenty-first aspect, wherein the first and second receivers have a predetermined first
And the second terminals (31) and (33) connected to the first and second terminals (31) and (33).
First and second feed points (19) on the conductor (6)
(20) is an antenna characteristic using the first and second frequencies.
The characteristic is selected to be high .

A dual band antenna according to claim 23 of the present invention is characterized in that, in the dual band antenna according to claim 22, the second conductor (6) is substantially rectangular.

The dual band antenna according to claim 24 of the present invention is the dual band antenna according to claim 12, wherein the first grounding conductor (4) made of the conductive material has a rectangular shape, an elliptical shape, and a multiple shape. It is characterized in that it is one of rectangular.

A dual band antenna according to a twenty-fifth aspect of the present invention is the dual band antenna according to the twenty-fourth aspect, wherein the first conductor (5) has an inner periphery and an outer periphery, and the inner periphery is rectangular and elliptical. It is characterized by being one of a shape and a polygon.

A dual band antenna according to a twenty-sixth aspect of the present invention is the dual band antenna according to the twelfth aspect, wherein the second grounded conductor (7) and the second conductor (6) have substantially the same shape. It is characterized by having.

A dual band antenna according to a twenty-seventh aspect of the present invention is the dual band antenna according to the twelfth aspect, wherein the dielectric material forming the substrate (3) is epoxy resin, polyimide resin, polyfluoroethylene resin, alumina , Magnesium titanate ceramics,
Or a polyphenylene oxide resin.

[0052]

According to the dual-band antenna of the present invention, the dual-band antenna is formed of a substrate (3) made of a dielectric material having a desired thickness, and has a first ground conductor on a first surface (1). (4) the second surface (2)
A first ground conductor (4) and an insulating band (27) on the first surface (1) via a first ground conductor (4) and an insulating band (27). A ring-shaped first conductor which is embedded in the conductor (5) and the substrate (3), faces the first ground conductor (4), and is insulated from the first ground conductor (4); A second conductor (6) that is in conduction with the first conductor (5), and receives and transmits the first frequency through the second conductor (6) and the second ground conductor (7). A patch antenna is formed, and in addition, a second frequency is received and transmitted from the second conductor (6) and the annular first conductor (5) electrically connected to the second conductor (6). In forming a cavity antenna to obtain an antenna for receiving and transmitting two desired frequencies, an annular first conductor (5) formed on a first surface (1) and a second conductor are formed. Are electrically connected to each other, and the first grounded conductor (4) and the second grounded conductor (7) are electrically connected to each other. ) And by removing the width of the first ground conductor (4) and the allowances (40) and (41), it is possible to adjust the frequency of reception and transmission desired by the dual band antenna.

The first and second conductors (5)
(6) and the first ground conductor (4) can take various shapes and can be square, rectangular, polygonal, circular, or elliptical with different frequency characteristics.

As the dielectric material constituting the substrate (3), any one of epoxy resin, polyimide resin, polyfluoroethylene resin, alumina, magnesium titanate-based ceramics, and polyphenylene oxide resin can be used. . Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

[0055]

【Example】

Example 1 A method of manufacturing a dual-band antenna according to the present invention includes, for example, etching each copper foil using a double-sided copper-clad laminate, counterboring the surface to form a cavity portion, and then forming the cavity portion. The circuit is formed by plating, and the cavity is filled with resin. Then, by forming a circuit on the surface of the filled resin, a planar antenna having a structure as shown in the top view of FIG. 1 and broken at AA shown in FIG. 1 and having a cross section as shown in FIG. One dual-band antenna can be obtained. FIG. 2 also shows a state where a feeder line is connected to the dual band antenna. A substrate (3) made of a dielectric material and constituting the dual band antenna (10) has a first surface (1) and a second surface (2) constituting front and back. This first surface (1) has four sides (15), (16) and (1).
7) A rectangular first conductor (5) is formed in which (18) is a rectangular shape made of a conductive material. Two sides (15) and (17) of this rectangular and annular first conductor (5) have a length d3 and a width d5, and the other two sides (16) and (18) have a length d4.
And the width is d6. On the first surface (1), there is formed a rectangular first grounding conductor (4) made of a conductive material and having a length of d8 and a width of d7, and an insulating band (27) around the first grounding conductor (4). An annular first conductor (5) surrounding the first ground conductor (4) is formed at a distance from the first ground conductor (4).

As shown in FIG. 1, the substrate (3) has a vertical length d.
In FIG. 2, the width has an outer dimension of d9, and its thickness is a value obtained by adding d2 to d1 as shown in FIG. Inside the substrate (3), a second conductor (6) is buried at a distance d1 and d2 from the first surface (1) and the second surface (2), respectively. This second conductor (6)
Is a rectangular conductor formed of a conductive material and having a dimension of d4 in length and d3 in width. This second conductor (6)
Are the four sides (15), (16), (1) of the first conductor (5).
7) The conductive path (8a) formed from (18) toward the second electric conductor (6) is connected to the first electric conductor (5) and is electrically connected to the first electric conductor (5). The conductor (6)
The first ground conductor (4) is insulated by a dielectric material.

The second grounding conductor (7) is a substrate (3)
Is formed on the entire surface of the second surface (2), and therefore has a rectangular shape with a length of d10 and a width of d9, and has the same size as the substrate (3).

In order to operate the dual band antenna, first and second feeder lines (24, 26) are connected to the second conductor (6) as shown in FIG. That is, these first and second feeder lines (2
4) and (26) are feeder lines (23) and (25) formed of conductive materials, respectively, and these feeder lines (23) and (25).
The first feeder line (24) is formed from the second surface (2) of the second conductor (6) inside the substrate (3) from the second surface (2). One feed point (1
9) through a power supply line (23), and is insulated from the second ground conductor (7) by an insulating film (21). The other feed line (26) passes through the intersection of two diagonals of the second conductor (6), which is the center point of the dual band antenna that does not affect the antenna characteristics, and
Penetrating from the surface (2) to the first surface (1),
Further, a power supply line (25) is connected from the first surface (1) to a second power supply point (20) of the second conductor (6) inside the substrate (3).
Connected through. This second feed line (26)
Until the power reaches the feed point (20), the insulating coating (22)
The second ground conductor (7), the second conductor (6),
And the first ground conductor (4).

FIG. 1 shows the first and second feeding points (1).
9) In order to show the position of (20), the first and second feed points (19) and (20) are shown in perspective, and these first and second feed points (19) are shown. As shown in the figure, (20) is a point on the diagonal line of the second conductor (6), which is apart from the intersection of the two diagonal lines by d11 and d12, respectively, and the feeding points (19) and (20) are , The local input impedance of the second conductor (6) should be equal to 50Ω for the feed lines and the signal compression of the first and second frequencies f1 and f2 at the respective positions, and the noise It is selected so that the cause electromagnetic wave component becomes the minimum value.

The dimensions d9 and d1 of the second ground conductor (7)
0 is determined by the correlation with the second conductor (6) according to the frequency of transmission and reception. This is because the second grounding conductor (7) is provided to cut off a splash signal reaching the second conductor (6) from the side surface or the back surface of the dual band antenna. As shown in the figure, the second surface (2) of the dual-band antenna is provided with a second grounded conductor (7) having a length d10 and a width d9, which is larger than the size of the second conductor (6). This is because microwaves that reach the second conductor (6) from the second surface (2) can be blocked.

The dimensions of the second conductor (6) and the distance d11 from the center point to the feeding point (19) are selected so that the antenna characteristics at the first frequency f2 are improved. Similarly, the feed point (20) is set from the size and center point of the second conductor (6) connected to the first annular conductor (5).
The distance d12 to is selected so that the antenna characteristics at the second frequency f1 are high.

For example, the two frequencies f1 = 1.575 GHz and f2 = 1.277 GH used for the GPS described above.
As for the above dual band antenna responding to z, d1 = d2 = 3.12 mm d3 = 6.03 mm d4 = 6.32 mm d5 = 0.57 mm d6 = 0.40 mm d7 = d8 = 5.09 mm d9 = d10 = 10.00 mm d11 = 1.34 mm d12 = 1.59 mm is used.

As the dielectric material constituting the substrate (3),
For example, polyphenylene oxide resin is optimal. This polyphenylene oxide resin has the lowest loss at the above frequency when the relative dielectric constant is 3.35 or 10.5.

The relative permittivity of the substrate (3) capable of reducing the loss at the above-mentioned frequency is 2.6, 3.6, 4.2, and 9.
6, and 10.6, it is preferable to use a dielectric material having a value in the vicinity of each. Suitable dielectric materials that can be used in addition to the polyphenylene oxide resin include epoxy resin, polyimide resin, polyfluoroethylene resin,
Alumina ceramics, magnesium titanate ceramics and the like are used. In addition, aluminum, tin, and silver are used as the conductive material in addition to copper.

The dimensions of the dual band antenna suitable for the GPS are two frequencies f1 = 1.602 GHz and f2 used in the GLONASS position detection system.
= 1.246 GHz, which is almost the same as the size of the dual-band antenna used at = 1.246 GHz.

Although the dimensions have been specified in the above embodiment,
There is no particular limitation, and d3> d7 d4> d8 d5> 0 d6> 0 d7> 0 d8> 0 d3 + d6 + d6 ≦ d9 d4 + d5 + d5 ≦ d10.

Embodiment 2 FIG. 5 is a top view of another embodiment of the dual band antenna according to the present invention. As in FIG. 1, first and second feeding points (inside the substrate (3)) are shown. 19) First and second feeding points (19) (20) so that the positions of (20) can be understood.
Is specified on the surface of the substrate (3).

This dual band antenna has a circular plate as shown in the figure. As in the first embodiment, a first ground conductor (4) is formed on a first surface (1) of a substrate (3), and an annular first conductor (5) formed of a conductive material is also provided. An insulating band (27) formed on the first surface (1);
The first ground conductor (4) is surrounded at a fixed interval through the first ground conductor (4).

Inside the substrate (3), a circular second conductor (6) having the size of the first ground conductor (4) and the insulating band (27) is embedded, It is electrically connected to the first conductor (5) by a conductive path (8). Therefore, since a cross section substantially similar to the cross sectional view of FIG. 2 described in the first embodiment is shown, it is omitted here.

The second conductor (6), which is electrically connected to the first annular conductor (5), is connected to the first and second feed points (19).
(20) Microwaves of desired first and second frequencies f1 and f2 are provided by feeding power.

Embodiment 3 FIG. 6 is a top view of another embodiment of the dual band antenna according to the present invention. As in FIG.
The first and second power supply points (19) and (20) are specified on the surface of the substrate (3) so that the positions of the power supply points (19) and (20) can be understood.

In this dual band antenna, as shown in the figure, the first annular conductor (5) and the first grounded conductor (4) are polygonal, specifically, hexagonal.

As in the first embodiment, the first ground conductor (4)
Is formed on the first surface (1) of the substrate (3). Further, a hexagonal ring-shaped first conductor (5) made of a conductive material is also formed on the first surface (1), and an insulating band (2) is formed.
The first grounding conductor (4) is surrounded at a fixed interval via 7).

In the substrate (3), a hexagonal second conductor (6) having a size equal to the distance between the first ground conductor (4) and the space is buried. Are electrically connected to the electric conductor (5) through a conductive path (8). Therefore,
Since the cross section is substantially the same as the cross sectional view of FIG. 2 described in the first embodiment, it is omitted here.

The second conductor (6), which is electrically connected to the first annular conductor (5), is connected to the first and second feeding points (19).
(20) Microwaves of desired first and second frequencies f1 and f2 are provided by feeding power. 7 and 8
Are two frequencies f1 = 1.575 GHz and f2 = 2 used for GPS of the dual band antenna of the first embodiment.
1. The value of the voltage standing wave ratio (VSWR) with respect to a frequency centered at 1.277 GHz is shown. The frequency range at each frequency is 21 when the voltage standing wave ratio is 3.
MHz and 11 MHz. 9 and FIG.
The directional characteristics with respect to the azimuth angle of the received wave when the direction perpendicular to the antenna surface is 0 (deg) at the above two frequencies f1 and f2, and the maximum value of the electromagnetic field at each angle = Emax (dB); Minimum value = Emin (dB)
It is shown.

Embodiment 4 FIGS. 11 to 15 show a dual band antenna according to another embodiment of the present invention.

FIG. 11 shows the dual band antenna (1).
FIGS. 12 and 13 are top views of 1).
It is sectional drawing fractured | ruptured by C and DD.

FIG. 14 is an exploded perspective view showing the configuration of the dual band antenna according to this embodiment.

FIG. 15 is a sectional view showing a state in which a feeder line is connected to the dual band antenna shown in FIG.

This dual band antenna (11) has one
One unit integrates two antennas,
One is, for example, a patch antenna for receiving a microwave having a frequency of f1 = 1.227 GHz, and the other is, for example, a cavity antenna for receiving a microwave having a frequency of f2 = 1.575 GHz.

As shown in FIG. 12, this dual band antenna (11) has an upper half substrate (3a) and a lower half substrate (3
b) having a rectangular substrate (3).

The respective substrates (3a) and (3b)
It is formed of polyphenylene oxide resin. still,
As a dielectric material constituting these substrates (3a) and (3b), besides polyphenylene oxide resin, for example,
Epoxy resin, polyimide resin, polyfluoroethylene resin, alumina ceramic, magnesium titanate ceramic, or the like can be used.

The second ground conductor (7) is formed on the lower surface of the lower half substrate (3b) by a circuit forming method such as exposure and etching used for a well-known printed wiring board. The second ground conductor (7) is connected to the lower half substrate (3).
Except for a part of b), it is formed almost entirely over the lower surface.

The second conductor (6) is formed on the upper surface of the lower half substrate (3b) in the same manner as the second ground conductor (7).
It is formed by a circuit forming method such as exposure and etching used for a well-known printed wiring board, and has a square shape and a smaller size than the second ground conductor (7).

Further, the first grounding conductor (4) is formed near the center of the surface of the upper half substrate (3a) and has a smaller square shape than the second conductor (6).

Further, in the same plane as the first grounding conductor (4), the first ring-shaped first conductor (4) is surrounded by an annular first band via an insulating band (27) so as to surround the periphery of the first grounding conductor (4). Conductor (5)
Are formed.

This annular first conductor (5) is formed as shown in FIG.
As shown in the figure, the inner peripheral portion is electrically connected to the inner peripheral portion of the second conductor (6) by a conductive path (8) provided at a constant interval along the inner peripheral portion and plated. It is formed by a plurality of via holes (39).

The annular first conductor (5), the second conductor (6), a plurality of via holes (39) for conducting the two conductors, and the second ground conductor. Together with (7), a patch antenna is formed. The annular first conductor (5), the second conductor (6), the plurality of via holes (39), and the first ground conductor (4) cooperate with the cavity. Form an antenna.

The first annular conductor (5) shown in FIG.
As shown in the figure, the first allowance (40) is formed integrally with the first allowance (40). The first allowance (40) is formed on a part of one side of the annular first conductor (5), It protrudes toward the outside of (3).

Further, a part of the side of the rectangular first grounding conductor (4) constituting the cavity antenna is provided so as to protrude toward the annular first conductor (5). 1
A second allowance (41) formed at a constant distance from the conductor (5).

Therefore, the patch antenna composed of the first conductor (5), the second conductor (6), and the second ground conductor (7) can be provided in the first allowance (40). By etching or cutting away a part of the patch antenna, it is possible to adapt to a desired frequency transmitted and received by the patch antenna.

Similarly, the second allowance (41) formed on the first ground conductor (4) is removed by etching or cutting a part of the second allowance (41). And the first and second conductors (5) and (6) can be adapted to a desired frequency transmitted and received by the cavity antenna.

This dual band antenna (11)
As shown in FIG. 14, it is composed of an upper half substrate (3a), a second conductor (6), a lower half substrate (3b), and a second ground conductor (7). As shown in the figure, the upper half substrate (3a) has a first ground conductor (4), an annular first conductor (5), a branch line (35) and a center line (3).
A connection line (37) for electrically connecting the vertex exposed on the first surface (1) of (6) is formed. Further, the second conductor (6) has an opening (34) near the center thereof.

FIG. 15 shows a feed line (2) for receiving and transmitting.
4) A cross-sectional view of the dual-band antenna (11) shown in FIG. 11 including (26), taken along the line CC, and the patch antenna of the dual-band antenna (11) is:
A feed line (24) composed of a coaxial cable in which a center conductor and an outer conductor are coaxially arranged and arranged in a coaxial cylindrical shape (24) (2 )
It is connected to a receiver and a transmitter for receiving and transmitting in 6) .

As shown in the figure, the second conductor (6) has a first feeding point (19), and the first feeding point (19)
Is formed at a position shifted from the center position of the second conductor (6), and is formed on the first power supply path (30).

The first power supply line (30) is formed by a via hole (30a) and has a terminal projecting from the top surface of the substrate (3). The terminal is a first ground conductor (30). 4)
Thus, a land (46) insulated is formed.

On the other hand, a first terminal (31), which is electrically insulated from the second ground conductor (7) and serves as a connection pad, is provided at the lower end of the first power supply path (30). It is formed on the lower surface of 3). A power supply line (23), which is a center conductor of the power supply line (24) formed of the coaxial cable, is soldered to the first terminal (31), and a shield wire (44) formed of an external conductor is a solder wire. 2 are soldered to the ground conductor (7).

Since the first power supply path (30) is formed by the via hole (30a), the first terminal (3)
In place of 1), the feeder line (23) is connected to the land (46).
Can be connected. Therefore, the first power supply path (3
0) is very useful for guiding the power supply line (23) from the lower surface of the substrate (3) to the land (46).

In this regard, it is also useful to use a pin connector having a pin in place of the power supply line (23). The pin is inserted into the via hole (30a), and the second conductor (6) is inserted.
Can be conducted to the first feeding point (19) formed in the first feeding point.

The second conductor (6) is connected to the second feeding point (2
0), the second feeding point (20) is formed at a position deviated from the center position of the second conductor (6), and the second feeding point (20) is connected to the branch path (35). ) And the substrate (3)
Connecting line (37) flush with the top surface of, and center line (36)
And a second power supply path (32). This branch (35) is formed by a plated via hole (35a) extending upward from the second feed point (20) to one end of the connection line (37).

The connection line (37) is formed on the same plane as the first ground conductor (4), and as shown in FIG.
The first grounding conductor (4) is electrically insulated from the first grounding conductor (4).
Are formed on diagonal lines of the ground conductor (4).

The center line (36) is formed by a plated via hole (36a) extending vertically from the one end of the connection line (37) through the substrate (3), and is formed on the lower surface of the substrate (3). The second terminal (33) is electrically insulated from the second ground conductor (7). The center line (36) passes through an opening (34) formed in the center of the second conductor (6) so as not to affect the antenna characteristics of the patch antenna and the cavity antenna. Extending.

In other words, the second feed line (32) of the cavity antenna is connected to the second terminal (33) on the lower surface of the substrate (3) via a series without adversely affecting the antenna characteristics. ing.

The feeder line (25), which is the center conductor of the feeder line (26), is soldered to the second terminal (33) which is electrically insulated from the second ground conductor (7). A shield wire (45) formed of an outer conductor is soldered to a point adjacent to the second grounded conductor (7), and the cavity antenna is connected to the corresponding receiver and transmitter with a coaxial cable in the same manner as the patch antenna. The power supply line (25) and the shielded wire (45) are connected via a power supply line (26).

The second grounding conductor (7) constituting the patch antenna has a plurality of plated conductors extending from the first grounding conductor (4) constituting the cavity antenna to the second grounding conductor (7). Are electrically connected by a ground line (28) formed by the via hole (29). These via holes (29) pass through openings (34) formed in the second conductor (6) and are formed radially with respect to the center line (36) as shown in FIG. That is, the via holes (29) are arranged in an arcuate shape centered on the center line (36) in close contact with each other, and are provided with a spread of an angle of about 250 ° or more.

The power supply line (25) is inserted through the center line (36) and can be soldered to the connection line (37). Further, it is useful to use a pin connector having a pin. The pin is inserted into the via hole (36a), and the second feed point (2) formed on the second conductor (6) is formed.
0).

The first feeding point (19) and the second feeding point (20) are formed on the same plane as the second conductor (6), so that the dual band antenna (11) has The two antennas can receive information sent by two different frequencies for accurate and reliable position detection and provide reliable position information to the connected receiver.

In the present invention, the first feeding point (19),
The second feed point (20) is located at the center via hole (36).
The center line (33), the branch (35), and the first feed (30) are arranged on a diagonal line of a square second conductor (6) passing through a) to manufacture the antenna. In the process, it can be easily formed by drilling the substrate (3).

Embodiment 5 FIG. 16 is a top view of a dual band antenna according to another embodiment of the present invention, and FIG. 17 is a cross-sectional view taken along a line CC of FIG.

This dual band antenna (12)
Dual band antenna (11) shown in the fourth embodiment.
The structure is substantially the same as that of the first embodiment, except that an insulating layer (38) made of the same dielectric material as the substrate (3) is overlaid on the upper layer. On the upper surface of the insulating layer (38), a conductive material is used.
A second feed line (32) for interconnecting the center line (34A) and the branch line (35A) from the second feed point (20A).
A connection line (37A) constituting a part of A) is formed.

Therefore, the various conductors shown in the fourth embodiment are formed under the insulating layer (38) shown in FIGS. 16 and 17, and are used in the description of the fourth embodiment in FIGS.
16 and FIG. 17 in which A is added to the reference numeral shown in FIG. 2 has the same function and shape as in the fourth embodiment. Therefore, redundant description is omitted here for simplicity.

In the fourth and fifth embodiments, as described above, the conductor formed on the upper surface of the substrate, the conductor formed inside the substrate, and the conductor formed on the lower surface of the substrate, as described above. Like using plated through holes and via holes to electrically connect each other,
For electrical interconnection, conductor lines, conductive pins, and similar connection means can be used. In addition, the first
Ground conductor (4) (4A), second ground conductor (7)
The shape of (7A), the second conductors (6) and (6A), and the first annular conductors (5) and (5A) are circular, elliptical, and polygonal according to the respective embodiments. Either may be used.

Embodiment 6 FIG. 18 is a top view of a dual band antenna according to another embodiment of the present invention, and FIG. 19 is a cross-sectional view taken along the line CC of FIG.

As shown in FIG. 18, the dual band antenna (13) of this embodiment has substantially the same appearance and cross section as the dual band antenna (11) shown in the fourth embodiment. An annular first conductor (5) is formed on the upper surface of the substrate (3) via a first rectangular ground conductor (4) and an insulating band (27). Also, the first conductor (5) and the first ground conductor (4) have a first allowance (40) and a second allowance (41) for adapting to the frequency of transmission and reception. Is provided.

As shown in FIG. 19, inside the substrate (3), a second conductor (6) buried opposite to the first ground conductor (4) and the insulating band (27). Are formed. The second ground conductor (7) is formed on the lower surface of the substrate (3). Other portions to which the numbers shown in FIG. 18 and FIG. 19 are added are the same as the portions to which the same numbers are added in FIG. 11 to FIG. Omitted.

The dual band antenna (13)
Each thickness of the substrate (3) constituting the main body is about 1 /
Using a substrate having a different dielectric constant between the upper half substrate (3a) and the lower half substrate (3b) having a thickness of 2 makes it possible to easily obtain a correspondingly widened interval in the reception range of the two frequencies to be received. it can.

For example, a substrate using a polyphenylene oxide resin having a dielectric constant of 10.0 is used for the upper half substrate (3a), and a dielectric constant of 3.5 is used for the lower half substrate (3b).
A correspondingly widened interval can be obtained in the reception range of two frequencies that can be easily received by using the substrate using the polyphenylene oxide resin.

As described above, a material having a high dielectric constant may be used for the upper half substrate (3a) and a material having a low dielectric constant may be used for the lower half substrate (3b). Board (3
A low dielectric constant material may be used for a) and a high dielectric constant material may be used for the lower half substrate (3b). Also, not limited to the same type of dielectric material, for example, epoxy resin, polyimide resin,
Polyphenylene oxide resin, polyfluoroethylene resin, alumina-based ceramics, magnesium titanate-based ceramics, or the like may be used, and the dielectric constant of the dielectric material forming the substrate (3) forming the patch antenna and the cavity antenna may be reduced. By using dielectric materials having different dielectric values in the upper and lower halves, the reception range of the two frequencies to be received can have a correspondingly wide spacing.

Embodiment 7 FIG. 20 is a top view of a dual band antenna according to another embodiment of the present invention, and FIGS.
FIG. 4 is a cross-sectional view of the dual band antenna cut along CC and DD of FIG.

As shown in the figure, the dual-band antenna (14) of this embodiment has substantially the same appearance and cross-sectional structure as the dual-band antenna (11) of the fourth embodiment. An annular first conductor (5) is formed on the upper surface of the substrate (3) via a first rectangular ground conductor (4) and an insulating band (27). Also, the first conductor (5) and the first ground conductor (4) have a first allowance (40) and a second allowance (41) for adapting to the frequency of transmission and reception. Is provided.

Further, a second conductor (6) buried opposite to the first ground conductor (4) and the insulating band (27) is formed inside the substrate (3). . The second ground conductor (7) is formed on the lower surface of the substrate (3).

Further, in the fourth embodiment, the ring-shaped first
A plurality of via holes (39) were formed to electrically connect the conductor (5) and the second conductor (6) embedded in the substrate (3). As shown in the figure, a conductive pin (47) having conductivity is driven in to electrically connect the first conductor (5) and the second conductor (6).

By using this conductive pin (47), the first conductor (5) and the second conductive material can be easily formed as compared with the method of forming the via hole (39) shown in the fourth embodiment. The body (6) can be electrically connected.

In addition, the portions to which the same numbers shown in FIGS. 20 to 22 are added are shown in FIGS.
Therefore, the duplicate description is omitted here for the sake of brevity.

Eighth Embodiment FIG. 23 is a top view of a dual band antenna according to another embodiment of the present invention, and FIGS.
FIG. 4 is a cross-sectional view of the dual band antenna cut along CC and DD of FIG.

As shown in the drawing, the dual band antenna (9) of this embodiment has the same appearance and sectional structure as those of the fourth embodiment.
Has substantially the same structure as the dual-band antenna (11) shown in FIG. 1, and is formed on the upper surface of the substrate (3) via a first rectangular ground conductor (4) and an insulating band (27). First
Conductor (5) is formed. Also, the first conductor (5) and the first ground conductor (4) have a first allowance (40) and a second allowance (41) for adjusting the frequency of transmission and reception. Is provided.

Further, a second conductor (6) buried opposite to the first ground conductor (4) and the insulating band (27) is formed inside the substrate (3). The second ground conductor (7) is formed on the lower surface of the substrate (3).

In this embodiment, the second conductor (buried inside the substrate (3) from the surface of the substrate (3) along the inside of the first annular conductor (5). An annular groove (48) facing 6) is formed. This annular groove (4
The depth of 8) is a depth at which the second conductor (6) is exposed. In order to electrically connect the first conductor (5) and the second conductor (6), the annular groove (4) is used.
The side of 8) is plated.

By using the annular groove (48), the first conductor (5) and the second conductor (6) can be easily formed as compared with the method of forming a via hole shown in the above embodiment. ) Can be electrically connected.

Other parts to which the same numbers shown in FIGS. 23 to 25 are added are shown in FIGS.
Therefore, the duplicate description is omitted here for the sake of brevity.

As described above, in the dual band antenna according to the present invention, since a part of the conductor forming the two antennas is formed on the upper surface of the substrate forming the dual band antenna, the user can In order to set the frequency of both the patch antenna and the cavity antenna to a desired value,
The adjustment can be easily made by removing the conductor formed on these surfaces.

Further, since the patch antenna and the cavity antenna are connected in that they share the conductor constituting the antenna, these two antennas in different modes are used.
There is no need for a means of substantially interconnecting the two antennas. Therefore, when adjusting one frequency of the antenna, it is possible to adjust the frequency to match each of the two antennas without affecting the frequency of the other antenna.

Further, the antenna exhibits high frequency and directional characteristics, and is useful as an antenna for receiving and transmitting two frequencies.

[0134]

As described above, according to the dual band antenna of the present invention, the annular first conductor and the second conductor formed inside the insulating substrate are electrically connected via the conductive path. And the first ground conductor and the second ground conductor are electrically connected via the ground line, so that the width of the second conductor formed inside the insulating substrate is reduced. Without adjusting the width of the annular first conductor and the first ground conductor formed on the upper surface without adjusting the width and allowance, the dual-band antenna can transmit and receive signals according to the purpose. Frequency can be easily adjusted.

[Brief description of the drawings]

FIG. 1 is a top view of a dual band antenna according to one embodiment of the present invention.

FIG. 2 is a cross-sectional view of the dual band antenna cut along AA in FIG.

FIG. 3 is a top view of a conventional dual band antenna.

FIG. 4 is a cross-sectional view of the dual band antenna taken along line BB in FIG. 3;

FIG. 5 is a top view of a dual band antenna according to another embodiment of the present invention.

FIG. 6 is a top view of a dual band antenna according to another embodiment of the present invention.

FIG. 7 is a frequency characteristic diagram centered on one frequency of the dual band antenna of one embodiment according to the present invention.

FIG. 8 is a frequency characteristic diagram centered on another frequency of the dual band antenna of one embodiment according to the present invention.

FIG. 9 is a directional characteristic diagram at one frequency of a dual band antenna according to an embodiment of the present invention.

FIG. 10 is a directional characteristic diagram of another frequency of the dual band antenna according to one embodiment of the present invention.

FIG. 11 is a top view of a dual band antenna according to another embodiment of the present invention.

FIG. 12 is a cross-sectional view of the dual band antenna cut along the line CC in FIG. 11;

FIG. 13 is a cross-sectional view of the dual band antenna cut along the line DD in FIG. 11;

FIG. 14 is an exploded configuration diagram of the dual band antenna of the embodiment.

FIG. 15 is a cross-sectional view of the dual band antenna according to the embodiment of the present invention, in which a feed line is connected to the dual band antenna of FIG.

FIG. 16 is a top view of a dual band antenna according to another embodiment of the present invention.

FIG. 17 is a cross-sectional view of the dual band antenna cut along the line CC in FIG. 16;

FIG. 18 is a top view of a dual band antenna according to another embodiment of the present invention.

FIG. 19 is a cross-sectional view of the dual band antenna cut along the line CC in FIG. 16;

FIG. 20 is a top view of a dual band antenna according to another embodiment of the present invention.

FIG. 21 is a cross-sectional view of the dual band antenna cut along the line CC in FIG. 20;

FIG. 22 is a cross-sectional view of the dual band antenna cut along the line DD in FIG. 20;

FIG. 23 is a top view of a dual band antenna according to another embodiment of the present invention.

FIG. 24 is a cross-sectional view of the dual band antenna cut along the line CC in FIG. 23;

FIG. 25 is a cross-sectional view of the dual band antenna cut along the line DD in FIG. 23;

[Description of Signs] 1 First surface 2 Second surface 3 Substrate 4 First ground conductor 5 First conductor 6 Second conductor 7 Second ground conductor 8 Conductive path 10 Dual band antenna 19 First feeding point 20 Second feeding point 21 Insulating coating 22 Insulating coating 23 Feeding line 24 First feeding line 25 Feeding line 26 Second feeding line 27 Insulating band 28 Ground line 29 Via hole 30 First feeding Path 31 First terminal 32 Second power supply path 33 Second terminal 34 Opening 35 Branch path 36 Central line 37 Connection line 38 Insulating layer 39 Via hole

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-113605 (JP, A) JP-A-63-169103 (JP, A) JP-A-4-234206 (JP, A) JP-A-4-234 144304 (JP, A) JP-A-6-350322 (JP, A) JP-A-4-348603 (JP, A) JP-A-4-343502 (JP, A) JP-A-64-82803 (JP, A) JP-A-1-135107 (JP, A) JP-A-3-103609 (JP, U) JP-A-63-106206 (JP, U) US Patent 4,318,931 (US, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01Q 13/08 H01Q 5/00

Claims (27)

(57) [Claims] 1. An antenna for receiving a first microwave and a second microwave having a different frequency from the first microwave, the antenna being made of a dielectric material having a desired thickness, and A substrate (3) having a first surface (1) and a second surface (2) forming the front and back, a first substrate made of a conductive material formed on the first surface (1) of the substrate (3); A ground conductor (4), which is formed on the first surface (1), and has an annular shape surrounding the first ground conductor (4) and the insulator (27) at regular intervals via the insulator (27). A first conductor (5) embedded in the substrate (3), facing the first ground conductor (4), insulated from the first ground conductor (4), and having a ring shape; A second conductor (6) electrically connected to the first conductor (5), and the second conductor (6) formed on the second surface (2). The second ground conductors are insulated from the second conductor (6) (7), a dual-band antenna with and. 2. The device according to claim 1, wherein the second conductor is connected to a receiver for receiving the first microwave and a receiver for receiving the second microwave. Dual band antenna. 3. The method according to claim 1, wherein the second conductor is substantially rectangular or polygonal.
Or the dual band antenna according to claim 2. 4. The method according to claim 1, wherein the second conductor is substantially circular or elliptical.
Or the dual band antenna according to claim 2. 5. The ring-shaped first conductor (5) has a contour defined by an outer peripheral contour similar to the first ground conductor (4). Item 4. The dual band antenna according to any one of Items 3. 6. The first ground conductor (4) and the second ground conductor (4).
2. The dual band antenna according to claim 1, wherein said conductor has substantially the same shape as said conductor. 7. The dielectric material of the substrate (3) is any one of an epoxy resin, a polyimide resin, a polyfluoroethylene resin, alumina, a magnesium titanate-based ceramic, and a polyphenylene oxide resin. 2. The dual band antenna according to 1. 8. The first and second feeding points (19) and (20).
6. The dual-band antenna according to claim 3, wherein the second conductor is on a diagonal line of the second conductor. 9. The first microwave and the first microwave
Antenna for receiving a second microwave having a frequency different from that of the wave
And this antenna receives the second microwave
Patch antenna and a receiver for receiving the first microwave.
A cavity antenna is provided integrally with a cavity antenna.
Is made of a dielectric material having the desired thickness, and
Having a first surface (1) and a second surface (2) forming
A substrate (3) formed on a first surface (1) of the substrate (3);
A first ground conductor (4) made of an electrically conductive material, the first contact formed on the first surface (1);
A certain distance is provided between the earth conductor (4) and the insulator (27).
An annular first conductor (5) surrounding the first ground conductor, embedded in the substrate (3);
(4), and is insulated from the first ground conductor (4).
And is electrically connected to the first annular conductor (5).
And a second conductor (6), wherein the patch antenna comprises:  An annular first conductor formed on a first surface (1)
(5) and a second conductor electrically connected to the first conductor (5).
Electric body (6),  An annular first conductor formed on a second surface (2);
A second conductor cooperating with a second conductor (6) conducting with the conductor (5);
And a grounding conductor (7). 10. The dual grounding device according to claim 9, wherein the first grounding conductor and the second grounding conductor are electrically connected via a ground line. Band antenna. 11. The dual band antenna according to claim 10, wherein the ground line is a via hole penetrating the substrate. 12. The second electric conductor (6) is connected to a first power supply path (30), and the first power supply path (30) is
The first terminal (31) formed on the second surface (2) extends from the first feeding point (19) on the second conductor (6) through the substrate (3), and The first terminal (31) is insulated from the second ground conductor (7), and the first conductor (5) is connected to the second power supply line (32);
The second power supply path (32) is connected to the second power supply point (2
0), and the second power supply path (32) extends through the substrate (3) from the second power supply point (20) to the second power supply path (32).
And is formed insulated from a second ground conductor (7) formed on the second surface (2), and the second conductor (6) has Open hole in center (34)
Is formed, the first feeding point (19) and the first feeding path (30) are shifted from the opening (34), and the second feeding path (32) is also opened (34). And the second power supply path (32) includes a branch line (35) passing through the substrate (3), a center line (36) passing through the opening (34), and the branch line (35). 10. The dual-band antenna according to claim 9, further comprising a connection line connecting the center line to the center line. 13. A method according to claim 1, wherein at least one of the first power supply path, the branch path, and the center line is a via hole penetrating the substrate. Item 10. A dual band antenna according to item 9. 14. The connection line (37) is formed on a first surface (1) on which the first ground conductor (4) is formed, the connection line (37) being a first ground conductor. The dual band antenna according to claim 12, wherein the antenna is insulated from (4). 15. The connection line (37) covers the first ground conductor (4) and is formed on an insulating layer (38) formed on the substrate (3). The dual band antenna according to claim 12, wherein: 16. A large number of conductive paths (8) conducting between the inner periphery of the first annular conductor (5) and the outer periphery of the second conductor (6).
The dual-band antenna according to claim 12, wherein is a via hole (39). 17. The annular first conductor (5) is formed integrally with at least a first allowance (40), the first allowance (40) being the first allowance (40) of the substrate (3). 10. The device according to claim 9, wherein the first cut-out is formed on the surface and is partially separated for receiving and transmitting a desired frequency of the patch antenna. Dual band antenna. 18. The first ground conductor (4) is formed integrally with at least one second allowance (41), the second allowance (41) being formed on the first of the substrate (3). Formed on the surface (1) of the antenna, protruding toward the annular first conductor (5), and partially separated to receive and transmit a desired frequency of the cavity antenna. The dual band antenna according to claim 9, wherein the dual band antenna is used. 19. The first and second feeding points (19).
The dual band antenna according to claim 12, wherein (20) is formed on the second conductor (6) in the same plane. 20. The second conductor (6) is substantially rectangular and has first and second feed points (19) (20).
13. The dual-band antenna according to claim 12, wherein are arranged along one diagonal of the second conductor. 21. The second conductor (6) being connected to a first receiver for receiving a first microwave and a second receiver for receiving a second microwave. The dual band antenna according to claim 12, wherein: 22. The first and second receivers are connected to predetermined first and second terminals (31) and (33), and are connected to the first and second terminals (31) and (33). A first and a second feed point (1) on the second conductor (6) that conducts.
9) (20) is an antenna based on the first and second frequencies .
22. The dual band antenna according to claim 21, wherein the antenna is selected so as to have a high characteristic . 23. A dual band antenna according to claim 22, wherein said second conductor is substantially rectangular. 24. The dual-band antenna according to claim 12, wherein the first ground conductor made of a conductive material is one of a square, an ellipse, and a polygon. 25. The dual according to claim 24, wherein the first conductor has an inner periphery and an outer periphery, and the inner periphery is one of a square, an ellipse, and a polygon. Band antenna. 26. The dual-band antenna according to claim 12, wherein the second ground conductor (7) and the second conductor (6) have substantially the same shape. 27. The dielectric material forming the substrate (3) is any one of epoxy resin, polyimide resin, polyfluoroethylene resin, alumina, magnesium titanate-based ceramics, and polyphenylene oxide resin. The dual band antenna according to claim 12.