JP2956904B2 - Circuit integrated flat antenna - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a circuit-integrated flat plate antenna.

[Prior Art] A flat plate antenna has advantages that it can be manufactured to be small in size with a small antenna height, can be manufactured in a light weight, and is easy to manufacture and process. It is being applied. FIG. 6 shows a basic structure of such a flat plate antenna. In this flat plate antenna, a dielectric 1 is sandwiched between two conductive plates, one conductive plate is used as a radiation conductor 2, and the other conductive plate is used as a ground conductor. A plate 3 and one end of the radiating conductor 2 and the grounding conductor plate 3 are connected by a short-circuiting plate 4, and are provided on the surface of the grounding conductor plate 3 at an appropriate position of the radiating conductor 2 as shown in FIG. Power is supplied through the power supply pin 5 which is a power supply line connected to the power supply connector 6. Power supply connector 6
As shown in FIG. 8, is connected via a coaxial cable 8 to a radio circuit 7 such as a transmission circuit or a reception circuit provided independently of the antenna.

9 and 10 show examples in which the short-circuit plate 4 is smaller than the width of the radiation conductor 2. FIG.

Conventionally, various laminated plates are used as the dielectric 1, a copper foil closely attached to one side thereof is used as a ground conductor plate 3, and a copper foil closely attached to the other surface is subjected to an etching process and used as a radiation conductor 2. It was customary. In this case, the short-circuit plate 4 connecting the radiation conductor 2 and the ground conductor plate 3 is formed by a through hole.

By the way, when a laminated board or the like is used as the dielectric 1, there is a problem that the antenna efficiency is poor due to a dielectric loss or the like with respect to a high-frequency current. Therefore, in order to improve the antenna efficiency, an antenna having almost no dielectric loss by using air having a relative dielectric constant of εr = 1 as the dielectric 1 is also provided as shown in FIGS. 11 and 12. I have.

Then, as shown in FIG. 13, a radio circuit 7 is formed on a ground conductor plate 3 and its circuit components 9 are arranged in a space layer between the ground conductor plate 3 and the radiation conductor 2. .

[Problems to be Solved by the Invention] By the way, the flat plate antenna in which the radio circuit 7 is formed as shown in FIG. 13 has the following problems. The grounding conductor plate 3 shown in FIG. 13 has a copper foil portion on one side only, and is formed of a printed board on which a circuit pattern is formed by etching. FIG. 14 shows an example of the circuit pattern. Copper foil part with dielectric 10 and circuit pattern formed
The ground conductor plate 3 is constituted by a printed board made of 11.
In FIG. 14 (b), the central part shows the circuit pattern 11a, and the thick part around it shows the ground plane 11b. That is, the copper foil portion 11 of the ground conductor plate 3 made of this printed board is used.
Is not uniform because of the formation of the circuit pattern 11a as well as the ground plane 11b, and is not sufficiently secured. Then, due to these factors, there is a problem that the antenna efficiency is reduced and the band is narrowed.

The present invention has been provided in view of the above points,
The high-frequency ground plane of the ground conductor is made uniform, and the ground plane is sufficiently taken to prevent a reduction in antenna efficiency and narrowing of the band.Also, the circuit components reduce the internal electric field generated between the periphery of the radiation conductor and the ground conductor. It is an object of the present invention to provide a circuit-integrated flat plate antenna for preventing the influence.

[Means for Solving the Problems] The present invention provides a radiation conductor formed in a flat plate shape having a feeding point at a predetermined point, a ground conductor arranged substantially in parallel with the radiation conductor, and one of the radiation conductors. A circuit-integrated flat plate antenna having a short-circuit plate extending from the portion to the ground conductor and short-circuiting the radiation conductor and the ground conductor, and mounting a circuit component on the ground conductor side. A conductive pattern such as copper foil, a circuit pattern is formed on one surface of the ground conductor, and a substantially entire other surface is a high-frequency ground plane. The radiating conductor is grounded, an opening is formed in the center of the radiation conductor, and a circuit component is mounted below the opening.

[Operation] According to the present invention, the high-frequency ground plane is formed on the surface of the ground conductor opposite to the circuit pattern, and the high-frequency ground portion is not sufficiently secured on the circuit pattern side of the ground conductor.
A sufficient grounding portion is secured on the opposite high-frequency ground plane, and the circuit components are prevented from affecting the internal electric field generated between the periphery of the radiation conductor and the ground conductor.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. As shown in FIG. 2, the radiating conductor 2 and the short-circuiting plate 4 are formed by integrally bending a single rectangular plate-like conductor into an L shape by sheet metal processing. A rectangular opening A is formed in the portion by punching. On the other hand, as shown in FIG. 1 and FIG.
It is formed from a double-sided copper-clad laminate (double-sided printed board) 12. That is, the double-sided copper-clad laminate 12 is composed of the dielectric 13 and the copper foil portions 14a and 14b provided on both sides of the dielectric 13. A circuit component 9 is mounted on the surface of the double-sided copper-clad laminate 12, and an insulating band 15 from which the copper foil portion 14 a around the circuit component 9 is cut off.
Is formed to achieve insulation between the circuit component 9 and the copper foil portion 14a. The surface of the copper foil portion 14a of the double-sided copper-clad laminate 12 constituting the ground conductor plate 3 on which the circuit components 9 are mounted is used as a high-frequency ground plane. And the copper foil part on the other side of the double-sided copper-clad laminate 12
A circuit pattern is formed on 14b, and the ground of this circuit pattern is connected to the high-frequency ground plane of the copper foil portion 14a by a through hole 16. The ground conductor plate 3 is not limited to a double-sided printed board, and may be formed by using a conductive material on both sides of an appropriate dielectric. Alternatively, the ground conductor plate 3 may be formed of a printed board on one side, a circuit pattern may be formed on the copper foil side, and a metal plate may be arranged on the other side to form the ground conductor plate 3.

The short-circuiting plate 4 is erected on the surface of the double-sided copper-clad laminate 12, that is, the grounding conductor plate 3, so that the radiation conductor 2 and the grounding conductor plate 3
5, and the end of the short-circuiting plate 4 is further connected to the copper foil portion 14b, which is the ground plane of the grounding conductor plate (double-sided copper-clad laminate 12) 3, so that the flat plate as shown in FIG. Antenna is realized.

In the case of this embodiment, the circuit components 9 are disposed on the double-sided copper-clad laminate 12 at a position facing the opening A in the center of the radiation conductor 2, and these circuit components 9 are disposed around the radiation conductor 2. The influence of the internal electric field generated between the ground conductor plate 3 and the ground conductor plate 3 is prevented.

In the above embodiment, the circuit component 9 is mounted on the surface on the radiation conductor 2 side. However, a circuit pattern is formed on the surface of the ground conductor plate 3 on the radiation conductor 2 side, and the circuit component 9 is mounted on the other surface. Alternatively, the circuit component 9 and the circuit pattern may be connected by through holes to form a flat antenna.

[Effects of the Invention] As described above, the present invention provides a radiation conductor formed in a flat plate shape having a feeding point at a predetermined point, a ground conductor arranged substantially parallel to the radiation conductor, and one of the radiation conductors. A circuit-integrated flat plate antenna having a short-circuit plate extending from the portion to the ground conductor and short-circuiting the radiation conductor and the ground conductor, and mounting a circuit component on the ground conductor side. A conductive pattern such as copper foil, a circuit pattern is formed on one surface of the ground conductor, and a substantially entire other surface is a high-frequency ground plane. Since the ground is grounded, an opening is drilled in the center of the radiating conductor, and the circuit components are mounted below this opening, a high-frequency ground plane must be formed on the surface opposite to the circuit pattern of the ground conductor. On the circuit pattern side of the ground conductor Therefore, even if the high-frequency grounding part is not sufficiently secured, the grounding part can be sufficiently secured on the opposite high-frequency grounding surface. This has the effect of preventing the reduction and the band narrowing.

In addition, by opening an opening in the center of the radiating conductor formed in a flat plate shape and mounting the circuit component below this opening, the circuit component is placed between the periphery of the radiating conductor and the ground conductor. Can be prevented from affecting the internal electric field.

[Brief description of the drawings]

FIG. 1 is a cutaway perspective view of a double-sided copper-clad laminate as a ground conductor plate according to an embodiment of the present invention, FIG. 2 is a perspective view of a radiation conductor and a short-circuit plate of the same, and FIG. FIG. 4 is a perspective view of the above-described grounded conductor plate, FIG. 5 is a perspective view of the above-described flat plate antenna, FIG. 6 is a perspective view of the conventional flat-plate antenna, and FIG. FIG. 8 is a cross-sectional view showing a case where power supply is performed, FIG. 9 is a perspective view of another conventional flat plate antenna, FIG. 10 is a cross-sectional view of the same, and FIG. FIG. 12 is a perspective view of a conventional example, FIG.
FIGS. 14A and 14B are a sectional view and a plan view showing an example of a circuit pattern of the above. 1 is a dielectric, 2 is a radiation conductor, 3 is a ground conductor plate, 4 is a short-circuit plate, 9 is a circuit component, and A is an opening.

Claims (1)

(57) [Claims] 1. A radiation conductor formed in a flat plate shape having a feeding point at a predetermined point, a ground conductor arranged substantially parallel to the radiation conductor, and a part extending from the radiation conductor to the ground conductor. And a short-circuit plate for short-circuiting the radiating conductor and the grounding conductor, and a circuit integrated type flat plate antenna in which circuit components are mounted on the grounding conductor side. And a circuit pattern is formed on one surface of the ground conductor, a substantially entire other surface is a high-frequency ground plane, and a ground conductor and a short-circuit plate are grounded on the high-frequency ground plane. A circuit-integrated flat plate antenna, characterized in that an opening is perforated in the opening and circuit components are mounted below the opening.