JPH04172001A - Antenna device - Google Patents

Abstract

PURPOSE:To obtain an antenna device to which a rower supply is easily made by arranging the third conductive board connected with a power feeding line path between the first conductive board forming a radiation conductor and the second conductive board forming an earth conductor. CONSTITUTION:A third conductive board 8 connected with a power feeding line path 4 is inserted into a position where an electric field or magnetic field combination is generated, between a first conductive board 7 forming the radiation conductor of an antenna and the second conductive board 2 forming the earth conductor. Therefore, the electric or magnetic field combination is generated between the third conductive board 8 and the first conductive board 7, and a non-contact power supply is operated from the third conductive board 8 to the antenna. And also, a combination quality can be adjusted by changing an interval between the first conductive board 7 and the third conductive board 8, or the size of the third conductive board 8, and an impedance matching of the power feeding line path 4 with the antenna can be obtained. Thus, the antenna device to which the power supply is easily made can be obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an antenna device, and mainly relates to
The present invention relates to a configuration for feeding power to an antenna device having a plate-like structure used in the F band, UHF band, and microwave band.

[Prior art] As shown in FIG. 7, for example, this conventional technology is shown in Hiroshi Haruki et al., "Inverted F-type antenna for portable radio equipment," 1985 National Conference of the Institute of Electronics and Communication Engineers, No. 613. 1 is a schematic configuration diagram showing a type of antenna device; in the figure, (1) is a substantially rectangular plate-shaped conductor forming a radiation conductor, (2) is a ground conductor made of a metal plate of a radio device housing, and (3) is a plate conductor (1
) a grounding conductor (4) whose one end is connected to the grounding conductor (2);
is the coaxial line that is the feed line to the antenna, (5) is the inner conductor of the coaxial line (4), (6) is the outer conductor of the coaxial line (4),
(7) is a plate conductor (1), a ground conductor (2), and a ground conductor (
3) is an inverted F antenna.

Here, the plate-shaped conductor (1) is arranged substantially parallel to the surface of the ground conductor (2) facing the plate-shaped conductor (1) at a constant interval, and one longitudinal end is used for grounding. The conductor (3) is connected to the ground conductor (2) and short-circuited. Coaxial line (
The inner conductor (5) of 4) is the ground conductor (2) of the plate conductor (1).
The grounding conductor (3) is directly connected to the surface facing the grounding conductor (3) by soldering or the like. Also, coaxial line (4)
The outer conductor (6) of is connected to the ground conductor (2).

Next, the operation will be explained.

The inverted F antenna (7) consists of a plate conductor (1) and a ground conductor (2).
constitutes a parallel plate line, and the plate conductor (1
) One longitudinal end is a short-circuited end and the other end is an open end, so that the specific frequency f depends on the length of the plate-shaped conductor (1). In this case, it operates as a resonator with one end short-circuited and the other end open. Therefore, the frequency f that is fed from the coaxial line (4) to the inverted F antenna (7) via the inner conductor (5). The radio waves resonate with the inverted F antenna (7) and are radiated into space. At this time, impedance matching between the coaxial line (4) and the inverted F antenna (7) is adjusted by the connection position between the inner conductor (5) and the plate-shaped conductor (1). In this way, the inverted F antenna shown in FIG. 7 has a function as an antenna device.

[Problems to be Solved by the Invention] Since this type of conventional antenna device is configured as described above, in order to connect the inner conductor (5) to the plate conductor (1), the plate conductor (1) is connected to the inner conductor (5). ) It is necessary to solder the surface facing the ground conductor (2) or to make a through hole in the plate conductor (1) and solder it, which poses the problem of cumbersome manufacturing. Ta. In addition, impedance matching between the input impedance of the inverted F antenna (7) and the characteristic impedance of the coaxial line (4) is achieved through the inner conductor (5) and the plate conductor (
1), and the connection position between the inner conductor (5) and the plate conductor (1) is uniquely determined, so there are restrictions on the arrangement, making it difficult to wire the coaxial line (4). There was a problem with that.

This invention was made to solve the above-mentioned problems, and an object thereof is to obtain an antenna device that can easily feed power.

[Means for Solving the Problems] In the antenna device according to the present invention, a first conductor plate forming a radiation conductor of the antenna, and a ground conductor of the antenna arranged substantially parallel to the first conductor plate, a second conductor plate to be formed, a conductor connecting the first conductor plate to the second conductor plate at one end thereof, a power supply line, and a space between the first conductor plate and the second conductor plate; and a third conductor plate for power supply, which is arranged in the power supply line and connected to the power supply line, and generates an electric field or magnetic field coupling with the first conductor plate.

[Function] In the antenna device configured as described above, the first conductor plate is located between the first conductor plate forming the radiation conductor of the antenna and the second conductor plate forming the ground conductor. Since the third conductor plate connected to the feeder line is inserted at a position where electric field or magnetic field coupling is generated between the two conductor plates, an electric field or magnetic field coupling is generated between the third conductor plate and the third conductor plate. Wireless power is supplied to the antenna. In addition, the amount of coupling can be adjusted by changing the distance between the first conductor plate and the third conductor plate or the dimensions of the third conductor plate, and impedance matching between the feed line and the antenna can be obtained. Relaxing restrictions on the arrangement of conductor plates and feeder lines.

[Example 1] FIG. 1 is a perspective view showing the main structure of an embodiment of the antenna device of the present invention. In the figure, (1) to (7) are the same as or equivalent to the conventional example shown in FIG. 7, (8) is a dielectric substrate, and (9) is a third conductive plate, which is a dielectric The plate conductor (1) is provided on the surface of the body substrate (8).
This is a strip conductor placed between the ground conductor (2) and the plate conductor (1), facing the plate conductor (1). In addition, in this example, the ground conductor (2), the dielectric substrate (8), and the strip conductor (9)
) constitutes a microstrip line (10). Here, the strip conductor (9) is the plate conductor (1)
Insert the inner conductor (5) of the coaxial line (4) at one end of the open side.
is connected, and the other end is open.

Next, the operation will be explained.

In the antenna device configured as described above, as in the conventional example, the inverted F antenna (7) is short-circuited at one end,
Works as a resonator with the other end open. FIG. 2 shows A-A in FIG. 1 for explaining power feeding in the antenna device.
It is a sectional view of (1) to (10) in the figure.
is the same as in FIG. Frequency f from the coaxial line (4) to the microstrip line (10). When radio waves propagate, an electric field as shown by the arrow in Figure 2 is generated between the plate conductor (1) and the strip conductor (9), and the microstrip line (10) and inverted F antenna (7) are Mainly electric field coupling. Therefore, the frequency f from the coaxial line (4). The radio waves are contactlessly fed to the inverted F antenna (7) by the electric field coupling. Powered frequency f. The radio waves resonate with the inverted F antenna (7) and are radiated into space. Here, the impedance matching between the coaxial line (4) and the inverted F antenna (7) is determined by the position and dimensions of the strip conductor (9) with respect to the plate conductor (1), or between the plate conductor (1) and the strip conductor (5). It is adjusted by changing the interval between In this way, the inverted F antenna (7) shown in FIG. 1 has a function as an antenna device. In the embodiment shown in FIG. 1 above, the open ends of the plate conductor (1) and the strip conductor (9) are opposite to each other, and the opposing surfaces of the plate conductor (1) and the strip conductor (9) are opposite to each other. Since the directions of the currents are opposite to each other, the potential difference becomes large and it is easy to obtain close coupling due to the electric field. Furthermore, even if the position of the microstrip line (10) is changed, impedance matching can be easily achieved by changing the dimensions of the strip conductor (9) or the distance between the plate conductor (1) and the strip conductor (9). It can be taken.

FIG. 3 is a perspective view showing the main structure of another embodiment of the antenna device of the present invention. In the figure, (1) to (10
) is the same as or equivalent to the embodiment shown in FIG. Here, the strip conductor (9) is the plate conductor (1)
One end on the open side is an open end, and the inner conductor (5) of the coaxial line (4) is connected to the other end.

Next, the operation will be explained.

The basic operation of the above embodiment is the same as that of the embodiment shown in FIG. 1, and the frequency f is transmitted from the coaxial line (4) to the microstrip line (10). When the radio waves propagate, an electric field as shown by the arrow in Fig. 2 is generated between the plate conductor (1) and the strip conductor (9), and the microstrip line (10
) and the inverted F antenna (7) mainly undergo electric field coupling. Therefore, the frequency f from the coaxial line (4). The radio waves are contactlessly fed to the inverted F antenna (7) by the electric field coupling. Powered frequency f. The radio waves resonate with the inverted F antenna (7) and are radiated into space. In the above embodiment, the plate-shaped conductor (1)
The open ends of the and strip conductor (9) are in the same direction, and the current direction on the opposing surfaces of the plate conductor (1) and the strip conductor (9) is the same, so the potential difference is small and roughness due to the electric field is reduced. Bonding is easy to obtain. In this case, since the directions of the currents are the same, the magnetic field coupling becomes stronger.

FIG. 4 is a perspective view showing the main structure of still another embodiment of the antenna device of the present invention. In the figure, (1) ~
(10) is the same as or equivalent to the embodiment shown in FIG. 1, and (11) is a conductor block. The conductor block (11) is inserted between the plate conductor (1) and the ground conductor (2) so that one side is in contact with the ground conductor (2), and a dielectric material is further placed on the other side of the conductor block (11). A substrate (8) is provided, and a strip conductor (9) is formed on this surface to face the plate-shaped conductor (1). In this embodiment, by making the thickness of the conductor block (11) appropriate, the distance between the plate-shaped conductor (1) and the conductor block (11) is changed from the distance between the plate-shaped conductor (1) and the ground conductor (2). It can be made narrower than the plate conductor (1), and since capacitance is generated between the plate conductor (1) and the conductor block (11), the resonance frequency can be adjusted by this capacitance, and the plate conductor (1) can be narrowed. It has the effect of making it smaller.

Further, the capacitance can be changed depending on the area of the conductor block (11).

Note that the power feeding shown in FIGS. 1 and 3 above can also be applied to the above embodiment, and the same effect can be obtained by operating in the same manner.

FIG. 5 is a perspective view showing the main structure of still another embodiment of the antenna device of the present invention. In the figure, (1) ~
(10) is the same as or equivalent to the embodiment shown in FIG. 1, (12) is a filter, (13) is an input terminal of filter (12), and (14) is an output terminal of filter (12). , (15) are connection conductors that connect the output terminal (14) and the strip conductor (9). In this example,
The conductor block (11
) in place of the filter (12).

The filter (12) has an approximately rectangular parallelepiped shape and is covered almost all around with a conductor except for a part, and has an input terminal (1
2) connects the output terminal (1) to the inner conductor (5) of the coaxial line (4).
4) are respectively connected to the strip conductors (9) by connecting conductors (15).

Note that although the filter (12) has an example in which the outer shape is a substantially rectangular parallelepiped, this is for ease of handling and is not limited to this shape. In this embodiment, a plate conductor (1) and a filter (12
), the resonance frequency can be adjusted by this capacitance, which has the effect of making the plate-shaped conductor (1) smaller. In addition, the filter (12) is connected to the plate conductor (1).
and the ground conductor (2), the antenna device can be made smaller.

Note that the power feeding shown in FIGS. 1 and 3 above can also be applied to the above embodiments, and the same effects can be obtained by operating in the same manner.

FIG. 6 is a perspective view showing the main structure of still another embodiment of the antenna device of the present invention. In the figure, (1) ~
(10) is the same as or equivalent to the embodiment shown in Fig. 1, and (16) is a spacer made of dielectric material inserted between the plate conductor (1) and the strip conductor (9). be. In this embodiment, the spacer (16) allows the interval between the plate-shaped conductor (1) and the strip conductor (9) to be set accurately, and the plate-shaped conductor (1) can be stably supported. Furthermore, by changing the dielectric constant of the dielectric used, the amount of coupling in power feeding can be adjusted.

Note that the power feeding shown in FIGS. 1 and 3 above can also be applied to the above embodiments, and the same effects can be obtained by operating in the same manner.

In the above embodiments, the first conductor plate is a substantially rectangular plate conductor (1), and the third conductor plate is a strip conductor (9), but the shapes are not limited to these. do not have.

In addition, in the drawings of the above embodiments, the strip conductor (9)
Although the longitudinal direction of the strip conductor (1) is the same as the longitudinal direction of the plate conductor (1), the arrangement of the strip conductor (9) with respect to the plate conductor (1) may be other than this, and the electric field coupling It is thought that the contribution of magnetic field coupling changes. However, it is thought that more efficient power supply can be achieved by supplying power at the open end side of the plate-shaped conductor (1).

[Effects of the Invention] As described above, according to the present invention, the wire is connected to the feed line between the first conductor plate forming the radiation conductor of the antenna and the second conductor plate forming the ground conductor of the antenna. , since a third conductor plate for power feeding that generates electric field or magnetic field coupling with the first conductor plate is arranged, contactless power can be supplied from the feed line to the antenna by electric field or magnetic field coupling,
By adjusting the amount of coupling by changing the distance between the first conductor plate and the third conductor plate or the dimensions of the third conductor plate, impedance matching between the feed line and the antenna can be obtained. Therefore, the restrictions on the arrangement of the first conductor plate and the feed line are relaxed, and an antenna device with easy power feeding can be obtained.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the main structure of an embodiment of the antenna device of the present invention, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIG. 3 is another embodiment of the antenna device of the present invention. FIG. 4 is a perspective view showing the main structure of the antenna device according to another embodiment of the present invention; FIG.
FIG. 6 is a perspective view showing the structure of the main part of still another embodiment of the antenna device of the present invention, FIG. 6 is a perspective view showing the structure of the main part of still another embodiment of the antenna device of the invention, and FIG. FIG. 1 is a schematic configuration diagram showing a conventional antenna device. In the figure, (1) is a plate conductor, (2) is a ground conductor, and (3
) is the grounding conductor, (4) is the coaxial line, (5) is the inner conductor,
(6) is the outer conductor, (7) is the inverted F antenna, (8) is the dielectric substrate, (9) is the strip conductor, (10) is the microstrip line, (11) is the conductor block, and (12) is the filter. , (13) is the input terminal, (14) is the output terminal,
(15) is a connection conductor, and (16) is a spacer. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] a first conductive plate that forms a radiation conductor of the antenna; a second conductive plate that is arranged substantially parallel to the first conductive plate and forms a ground conductor of the antenna; and a second conductive plate that forms a ground conductor of the antenna; a conductor connected to the second conductor plate; a feeder line; a conductor disposed between the first conductor plate and the second conductor plate, connected to the feeder line, and connected to the first conductor plate; An antenna device comprising: a third conductor plate for power feeding that generates electric field or magnetic field coupling between the antenna devices.