JPH01216603A - Plate antenna - Google Patents

Abstract

PURPOSE:To prevent disturbance in the internal electric field even with the arrangement of circuit components between a ground conductor plate and radiation conductor corresponding to the position of aperture by adopting the constitution such that a hollow radiation conductor whose outer shape is nearly a square and whose middle part is opened and the ground conductor plate are laminated via a dielectric substance. CONSTITUTION:A double side copper clad lamination plate is used, the radiation conductor of a square shape whose middle part has opening A is formed onto one copper foil face by the etching process, the other copper foil face is used as the ground conductor plate 3 and the lamination plate in-between is used as the dielectric substance 1. Then the end of the radiation conductor 2 is connected to the ground conductor plate 3 by three pin-shaped short-circuit bodies 4. The antenna is energized via a feeding pin 5 being a feeder in the inside of the radiation conductor 2. The corners of the outside of the radiation conductor 2 may be chamferred. Furthermore, the shape of the opening A in the middle may be optional. Since the internal electric field between the radiation conductor 2 and the ground conductor plate 3 is directed vertically between the side circumferential piece of the radiation conductor 2 and the ground conductor plate 3, no internal electric field is caused to the middle aperture A of the radiation conductor 2. Thus, the internal electric field is not disturbed by the substance provided on the face of the ground conductor plate corresponding to the center aperture A.

Description

[Detailed description of the invention] [Field of industrial use J The present invention relates to a flat plate antenna.

[Conventional technology 1] Flat plate antennas have the advantage of having a low antenna height (can be made small and lightweight, and are easy to manufacture and process, and are therefore suitable for wireless devices that require miniaturization. It is being applied to

Figure 11 shows the basic structure of such a flat antenna.
This flat plate antenna has a dielectric material 1 sandwiched between two conductor plates, one conductor plate serving as a radiation conductor 2, the other conductor plate serving as a ground conductor plate 3, and one end of the radiation conductor 2 and a ground conductor plate. 3
As shown in FIG. 12, power is supplied via a power supply pin 5, which is a power supply line, connected to a power supply connector 6 provided on the surface of the ground conductor plate 3 at an appropriate location on the radiation conductor 2. be done. As shown in FIG. 13, the power feeding connector 6 is connected via a coaxial cable 8 to a wireless circuit 7 such as a transmitting circuit or a receiving circuit provided independently of the antenna.

Figures Ij&14 and IJi15 show examples in which the width of the shorting body 4 is smaller than the width of the radiation conductor 2.

Conventionally, various laminated plates are used as the dielectric 1, a copper foil closely placed on one side is used as the ground conductor plate 3, and a T14 whistle placed closely on the other side is etched and used as the radiation conductor 2. It was customary to have one.

In this case, the short-circuit body 4 connecting the radiation conductor 2 and the ground conductor plate 3 was formed by a through hole.

However, when a laminated plate or the like is used as the dielectric 1, there is a problem that the antenna efficiency is poor due to dielectric loss and the like with respect to high frequency current. Therefore, in order to improve the antenna efficiency, an antenna with almost no dielectric loss was created by using air with a relative permittivity εr=1 as the dielectric 1.
As shown in FIG.

As shown in FIG. 18, a radio circuit 7 is formed on a ground conductor plate 3, and a circuit component 8 thereof is arranged in a space layer between the ground conductor plate 3 and the radiation conductor 2.

[Problem to be Solved by the Invention 1] However, as shown in FIG. 18, the flat plate antenna in which the radio circuit 7 is formed has the following problems.

In other words, when the flat plate antenna is excited, the electric field generated between the ground conductor plate 3 and the radiation conductor 2 will move as shown by the arrow X shown in FIG.
Alternatively, it stands approximately perpendicular to the radiation conductor 2. Since the circuit component 8 is made of various dielectric materials and metal materials, when it is placed between the radiation conductor 2 and the ground conductor plate 3 as shown in FIG. 18, the internal electric field is as shown in FIG. 19(b). As shown by the arrow When the wireless circuit 7 is provided between the radio conductor 3 and the radiation conductor 2, there is a problem that circuit adjustment becomes difficult.

The present invention has been made in view of the above-mentioned problems, and aims to provide a flat plate antenna in which the material cost of the radiation conductor is low, the weight can be reduced, there is little disturbance in the internal electric field, and there is little loss in gain. purpose.

[Means for Solving the Problems] The present invention includes a hollow radiating conductor whose outer shape is substantially rectangular in plan view and an open center, and a ground conductor plate that are laminated with a dielectric interposed therebetween, and one end of the radiating conductor is connected to a short-circuit conductor. The radiating conductor is connected to a ground conductor plate through a power supply line, and power is supplied to the radiation conductor through a power supply line.

Incidentally, part or all of the side peripheral piece of the radiation conductor may be formed of a wire body.

[Operation] Since the internal electric field between the radiation conductor and the ground conductor plate is vertical between the side circumferential piece of the radiation conductor and the ground conductor, the internal electric field is not present at the center opening of the radiation conductor. Therefore, the internal electric field is not disturbed by anything provided on the ground conductor plate surface corresponding to this central opening.

[Example] The present invention will be explained below with reference to Examples.

192 This embodiment uses a double-sided steel-clad laminate as shown in FIGS. 1 and 2, and has a radiation conductor 2 having a mouth-shaped opening A in the center by etching on one copper foil surface. , the other copper foil surface is used as a grounding conductor plate 3, the laminated plate between them is used as a dielectric 1, and the end of the radiation conductor 2 has three pin-shaped short circuits 4.
It is connected to the ground conductor plate 3 by.

Power is supplied via a power supply pin 5 which is a power supply line inside the radiation conductor 2 . At this time, considering the connection workability, the ground conductor plate 2
A connector 6 for joining the feeder line is provided. Furthermore, radiation conductor 2
As shown in Fig. 3(a), the outer corner may be rounded or the outer shape may be rectangular, and the central opening A may have any shape other than a rectangle as shown in Fig. 3(b). Alternatively, the shorting body 4 may be formed of a plate having the same width as the radiation conductor 2 or a width slightly narrower than that of the radiation conductor 2.

This example uses air as the dielectric 1, and the radiation conductor 2 and short-circuiting body 4 are made by bending a single rectangular flat conductor into an L shape by sheet metal processing, as shown in Fig. 4. It is processed into one piece, and a rectangular opening A is formed in the center of two sides of the radiation conductor by punching.

On the other hand, the ground conductor plate 3 is formed by the copper foil surface of the single-sided copper-clad laminate 9 shown in FIG. 5, and as shown in FIG. The copper foil on the back side is etched to form a circuit pattern, and the ground pattern around the circuit is expanded to serve as a ground conductor for the above-mentioned ground conductor plate 3.

The shorting body 4 is installed upright on the surface of the single-sided copper-clad laminate 9, separating the radiation conductor 2 and the grounding conductor plate 3, and using the air between them as the dielectric body 1. By connecting the end to the ground conductor plate 3 on the back surface, a flat plate antenna is realized as shown in FIG.

In this embodiment, the circuit components 8 are arranged on the laminated plate 9 at a position facing the opening A in the center of the radiation conductor 3, and these circuit components 8 are arranged between the side periphery of the radiation conductor 3 and the ground conductor plate 3. This prevents it from affecting the internal electric field generated in the

In the case of this embodiment configured in this way, the 14-wire arrangement of the radio circuit can be easily performed using the opening A at the center of the radiation conductor 3.

[Dog] "A" - In each of the above embodiments, the radiation conductor 8 was formed by sheet metal processing, but since the antenna current only flows to the periphery, in this embodiment it is made of brass wire as shown in Fig. 8. A wire body is bent into a U-shape and both ends thereof are connected by soldering or the like to the base end 2a of a radiation conductor 2 which is formed integrally with a short circuit body 4 by sheet metal processing, thereby constructing a radiation conductor 2 having a substantially rectangular outer shape. The ground conductor plate 3 that connects the short-circuit body 4 can be formed of a single conductor plate, or the circuit component 8 can be formed of a single-sided copper-clad laminate as in the second embodiment. The arrangement may be the same as in the second embodiment.

In the third embodiment, the base end 2a of the radiation conductor 2 is formed of a sheet metal, but the entire base end 2a may be formed of a wire body, and FIG. 9 shows the case of this embodiment.

(9) In the above embodiment 4, the shorting body 4 and part of the radiating conductor 2 were formed of sheet metal, but in this embodiment, the radiating conductor 2 and the shorting body 4 are integrated with one wire body. In this embodiment, an antenna is formed that does not require sheet metal processing and does not require connection work between the radiation conductor 2 and the shorting body 4, thereby further reducing costs.In other words, in the case of this embodiment, as shown in FIG. As shown in (a), a radiation conductor 2 is formed by bending the radiation conductor 2 into a substantially C shape, and one end of the radiation conductor 2 is bent vertically to form a short circuit 4, and the other end of the radiation conductor 2 is soldered to one end. Figure 910(b) shows the completed planar antenna of this example.

Note that two short-circuit bodies 4 may be formed by vertically folding both ends of the radiation conductor 2 as shown in WSio diagram (c).

In this case, since radio waves with a high frequency of about 300 MHz or more are used, the two short-circuit bodies 4 can be considered as a closed loop in terms of high frequency.

In addition, in Examples 3 and 4.5, power is supplied to the radiation conductor 2 at the appropriate location! Of course, it can be done via a wire.

[Effects of the Invention] The present invention comprises laminating a hollow radiating conductor with a substantially rectangular outer shape and an opening in the center and a grounding conductor plate through a dielectric material, and connecting one end of the radiating conductor through a shorting conductor. Since it is connected to a ground conductor plate, it can be made lighter than conventional planar antennas, and the opening in the center eliminates the internal electric field that conventionally occurs between this part and the ground conductor plate. , there is no fear that the internal electric field will be disturbed even if circuit components are placed between the ground conductor plate and the radiation conductor corresponding to the opening position, so there is no reduction in gain, and the circuit llIg, This also becomes possible by using the opening, and as a result, the wireless device can be easily manufactured in a small size.

Further, if part or all of the side circumferential piece of the radiation conductor is formed of a wire body, there is an effect that cost and weight can be further reduced.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of Embodiment 1 of the present invention, Fig. 2 is a sectional view of the same, Fig. 3(a) and (b) are front views showing another example of the radiation conductor of the above, and Fig. 4. is a perspective view of a radiation conductor and a short-circuiting body of Example 2 of the present invention, FIG. 5 is a cross-sectional view of a single-sided copper-clad laminate used in the above, FIG. A perspective view of the same as above, FIG. 8 is a perspective view of the third embodiment of the present invention, FIG. 9 is a perspective view of the fourth embodiment of the present invention, and FIG. 10(a) is a radiation conductor of the fifth embodiment of the present invention. A perspective view of the short-circuit body, FIG. 10(b) is a perspective view of the same as above, FIG. 10(c) is a perspective view of a modified example of the above, #IJ11 is a perspective view of the conventional example, and FIG. 12 is a cross-section of the same as above. 13 is a cross-sectional view for explaining the power supply described above, FIG. 14 is a perspective view of another conventional example, FIG. 15 is a cross-sectional view of the same as the above, FIG. 16 is a perspective view of another conventional example, and FIG. The figure is a sectional view of the same as above, FIG. 18 is a perspective view of yet another conventional example, and FIG. 19 is a perspective view of another conventional example.
Figure (aHb) is an explanatory diagram of the same operation as above. DESCRIPTION OF SYMBOLS 1... Dielectric, 2... Radiation conductor, 3... Ground conductor plate, 4... Short circuit body, A... Opening. Agent Patent Attorney Ishi 1) Chief 73... Ground conductor plate Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 8 Figure 9 Figure 10 (a) (C) Figure 11 Figure 12 Figure 13 Figure 18 Figure 19 (b)

Claims (2)

[Claims] (1) A hollow radiating conductor with an approximately rectangular shape and an open center and a grounding conductor plate are laminated via a dielectric, and one end of the radiating conductor is connected to the grounding conductor plate via a shorting conductor. A flat plate antenna characterized in that it is configured as follows and feeds power to a radiation conductor via a feed line. (2) The flat plate antenna according to claim 1, wherein a part or all of the side peripheral piece of the radiation conductor is formed of a wire body.