JPH0641214U - Planar antenna device - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] To provide a planar antenna device for receiving radio waves using a planar antenna element in GPS (Global Positioning System), etc. With the goal. [Structure] A step portion is formed on a peripheral portion of the planar antenna element 11, and a claw portion of the mounting plate 12 is bent and engaged with the step portion to hold the planar antenna element 11 on the mounting plate 12.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a planar antenna device, and more particularly to a planar antenna device for receiving radio waves using a planar antenna element in GPS (Global Positioning System) or the like.

[0002]

[Prior art]

 GPS is a system that knows the user's current position (latitude, longitude, altitude) by using the radio waves radiated to the ground from artificial satellites such as multiple GPS satellites. Usually, an antenna unit, receiver, signal processing Section, display section, and the like.

Radio waves from the artificial satellite are received by the antenna unit, amplified, and then supplied to the receiving unit. The receiving section demodulates the signal from the antenna unit and supplies it to the signal processing section. The signal processing unit performs signal processing such as positioning based on the demodulated data from the receiving unit. The display unit displays the positioning result determined by the signal processing unit on the map.

FIG. 12 shows a schematic configuration diagram of a conventional antenna unit. The antenna unit is composed of an antenna element section 1 for converting ordinary radio waves into an electric signal and a circuit section 2 having a low noise amplifier for amplifying the electric signal converted by the antenna element section 1. The antenna element part 1 is composed of a planar antenna element in which a conductive thin film 1b is formed on a substrate 1a made of a PPO material for downsizing, and the antenna element part 1 and the circuit part 2 are separately formed. , Were connected to each other by the cable 3, and were arranged and housed side by side in an outer case 4 made of resin. If the antenna element part 1 has a conductive material above the conductive thin film 1b on the substrate 1a, it will adversely affect the characteristics of the antenna. Was held in.

[0005]

[Problems to be Solved by the Invention] However, since the conventional antenna unit holds the antenna element part by sandwiching the antenna element part between the outer case and the like, the antenna element part and the outer case may be different from each other due to the dimensional variation of the outer case. There was a problem that a gap was created and the antenna element part vibrated and adversely affected the antenna characteristics.

The present invention has been made in view of the above points, and an object thereof is to provide a planar antenna device that is resistant to vibration and the like.

[0007]

[Means for Solving the Problems]

 The present invention is a planar antenna device having a planar antenna element having a flat receiving surface and a mounting plate for holding the planar antenna element, the mounting plate engaging the planar antenna element. An engaging step for stacking and holding the planar antenna element on the circuit board, and the planar antenna element has a step portion in which the engaging claw of the mounting plate is bent at a peripheral edge portion of the planar antenna element. It becomes the structure which has.

[0008]

[Action]

 The planar antenna element is held on the mounting plate by bending the engaging claws of the mounting plate on the stepped portion formed on the peripheral edge thereof. Further, since the engaging claw is configured to engage with the stepped portion formed on the peripheral portion, it does not affect the receiving surface and does not adversely affect the characteristics of the antenna.

[0009]

【Example】

 FIG. 1 shows a block diagram of an embodiment of the present invention. In the figure, 5 indicates a main body of the planar antenna device. The planar antenna device body 5 is housed in the inner case member 6, and the inner case member 6 is further covered with an outer case member 7 screwed to the inner case member 6.

The inner case member 6 is composed of an upper case member 6a and a lower case member 6b, and a resin packing 6c is arranged at a joint portion between the upper case member 6a and the lower case member 6b to keep the inside airtight. It is configured to do.

Inside the lower case member 6b, a mounting screw hole 6b-1 for the apparatus body 5 is formed. The device body 5 is fixed to the lower case member 6b by screwing a screw 8 into a screw hole 6b-1 through a mounting hole described later.

Further, a mounting portion 6b-2 for the magnets 9a and 9b is formed on the outer side of the lower case member 6b. The magnets 9a and 9b are screwed to the mounting portion 6b-2. The device is fixed to the body of the automobile by magnets 9a and 9b.

The device body 5 is provided with a connector, which will be described later, and the cable 10 is connected to this connector. The cable 10 penetrates the inner case member 6 and the outer case member 7 and is drawn to the outside.

FIG. 2 is an exploded perspective view of a main part of the apparatus body 5 according to the embodiment of the present invention. In the figure, reference numeral 11 is a planar antenna element portion, 13 is a circuit board, 14 is a case member, and 15 is a cover material.

FIG. 3 shows a configuration diagram of the planar antenna element 11. The planar antenna element portion 11 is formed by forming a conductive thin film 11b made of a conductive material such as metal on a substrate 11a made of a dielectric material such as dielectric ceramics. The conductive thin film 11b is connected to the outside via the pin 11c. The pin 11c is inserted into the through hole 11d formed on the substrate 11a from above the conductive thin film 11b, the head 11c-1 contacts the conductive thin film 11b, and the other end 11c-2 is projected to the back surface of the substrate 11a. The other end 11c-2 of the pin 11d is connected to an external circuit and electrically connected to the conductive thin film 11b.

As a material for the substrate 11a, a resin material such as a PPO material can be considered in addition to the dielectric ceramics, but the PPO material requires punching and cutting at the time of forming the substrate, and is not easy to mold. On the other hand, since the dielectric ceramics can be molded simply by putting them in a mold and sintering, and the molding is easy, in this embodiment, the substrate 11a is formed of the dielectric ceramics.

The planar antenna element 11 is directly fixed to the circuit board 13 with a double-sided tape or an adhesive. FIG. 4 shows a configuration diagram of the mounting plate 12. The mounting plate 12 is formed by punching a single metal plate by a press working or the like and bending a claw portion or the like.

The mounting plate 12 has positioning claws 12a-1 to 12a-7 of the planar antenna element 11, mounting claws 12b-1 to 12b-4 of the case member 14, and mounting hole 12c of the case member 14. -1 to 12c-4, the through hole 12d of the connection pin 11c of the planar antenna element 11, and the fixing through holes 12e-1 to 12e-4 of the mounting plate 12 are integrally formed.

The claws 12a-1 to 12a-7 are cut and raised on the upper surface of the mounting plate 12, and the claws 12b-1 to 12b-4 are cut and raised on the claws 12a-1 to 12a-7 of the mounting plate 12. It is cut and raised on the lower surface, which is the opposite of the cut surface.

The planar antenna element 11 is mounted on the mounting plate 12 so that the lower surface from which the pin 11c projects is opposed to the upper surface of the mounting plate 12 where the claw portions 12a-1 to 12a-7 are cut and raised. The claws 12a-1 to 12a-7 are bent and engaged with the step 11a-1 at the peripheral edge of the flat antenna element 11, and the flat antenna element 11 is held by the mounting plate 12. At this time, the pin 11c penetrates the through hole 12d and projects to the back surface of the mounting plate 12.

FIG. 5 is a perspective view of a flat antenna element and a mounting plate according to an embodiment of the present invention.

As shown in FIG. 5, since the planar antenna element 11 is held by bending the claw portions 12 a-1 to 12 a -7 on the mounting plate 12, it can be securely held on the mounting plate 12. Further, since the claw portions 12a-1 to 12a-7 are engaged with the step portion 11a-1 formed on the peripheral portion of the planar antenna element 11, the receiving surface 11e-2 is not affected. Therefore, it does not adversely affect the antenna characteristics.

FIG. 6 shows a configuration diagram of the circuit board 13. The circuit board 13 has a structure in which an electronic component chip 13a and a connector 13c are soldered onto an insulating board 13a on which wiring is printed.

The insulating substrate 13a has a substantially square shape, and has a convex portion 13a-1 on a part thereof. Further, the insulating substrate 13a is formed with notches 13a-2 to 13a-5 corresponding to the claws 12b-1 to 12b-4 of the mounting plate 12.

The electronic component chip 13b is surface-mounted on the insulating substrate 13a, the connector 13c serves as an output terminal and is fixed onto the convex portion 13a-1 of the insulating substrate 13a by soldering or the like, and the connecting portion 13c-1 has a convex portion. It is configured to further project outward from 13a-1.

Further, through holes 13a-6 are formed on the insulating substrate 13a so as to correspond to the pins 11c of the planar antenna element unit 11, and the mounting surface of the electronic component chip 13b is opposite to the mounting surface. The pin 11c of the planar antenna element portion 11 penetrates and projects to the mounting surface side, and the pin 11c is soldered on the mounting surface side to be connected to the circuit.

The circuit board 13 is fixed to the case member 14 with the mounting surface of the electronic component chip 13b serving as the lower surface.

FIG. 7 shows a block configuration diagram of a circuit formed on the circuit board 13.

On the circuit board 13, as shown in FIG. 7, a low noise amplifier (LNA) is formed by connecting the amplifiers 13d and 13e with the bandpass filter 13f interposed therebetween.

FIG. 8 shows a configuration diagram of the case member 14. The case member 14 is formed into a tubular shape by punching a single metal plate by press working or the like, and then bending and welding.

The end face of the case member 14 is engaged with the protrusions 14a-1 to 14a-4 corresponding to the holes 12c-1 to 12c-4 of the mounting plate 12 and the protrusion 13a-1 of the circuit board 13. The concave portion 14b is formed. On the inner side surface of the case member 14, claw portions 14c-1 to 14c-4 for positioning and fixing the circuit board 13 are formed on two opposite sides. The claw portions 14c-1 to 14c-4 are formed by cutting and raising the side plate portion in a wedge shape. Three protrusions 14d for locking the cover member 15 are formed on each of the four sides near the lower end of the outer surface of the case member 14.

The circuit board 13 is attached to the case member 14 through the opening on the end face side where the concave portion 14b with which the convex portion 13a-1 of the circuit board 13 engages is formed. The circuit board 13 is mounted such that the electronic component mounting surface faces the opening, and the edge of the mounting surface abuts against the claw portions 14c-1 to 14c-4 of the case member 14 and is positioned. At this time, the convex portion 13a-1 of the circuit board 13 is engaged with the concave portion 14b of the case member 14 and protrudes to the outside of the case member 14 together with the connector 13c.

The circuit board 13 is soldered to the claw portions 14 c-1 of the case member 14 and fixed to the case member 14. The case member 14 is connected to the ground of the circuit board 13 by soldering, and the side surface of the circuit board 13 is shielded from the outside.

The mounting plate 12 is mounted on the case member 14 from the upper surface of the circuit board 13.

In the mounting plate 12, the claw portions 12b-1 to 12b-4 penetrate the cutout portions 13a-2 to 13a-5 of the circuit board 13 and engage with the inner side surface of the case member 14 to form the circuit board. The electronic component 13 of the electronic component chip 13b is projected to the mounting surface, and the projections 14a-1 to 14a-4 formed at the ends of the case member 14 are engaged with the through holes 12e-1 to 12e-4. The claws 12b-1 to 12b-4 are soldered to the mounting surface of the electronic component chip 13b of the circuit board 13, and the mounting plate 12 is fixed to the case member 14.

A cover member 15 is locked on the lower surface side of the case member 14.

FIG. 9 shows a configuration diagram of the cover member 15. The cover member 15 is formed by punching, bending, and welding a single metal plate by pressing or the like. The cover member 15 is composed of a flat plate portion 15a corresponding to the opening of the case member 14 and a peripheral edge portion 15b formed around the flat plate portion 15a. The peripheral edge portion 15 has a configuration in which each of the four sides of the flat plate portion 15a is bent at a right angle to the flat plate portion 15a, and the peripheral edge portions 15b-1 to 15b-4 on each side each have three engaging pieces 15d. . The engaging piece 15d is formed with an engaging hole 15c that engages with a convex portion 14d formed near the lower end of the case member 14. Further, the tip portion 15e of the engagement piece 15d is bent outward so that it can be easily attached to the case member 14.

FIG. 10 is an assembly view of a main part of the planar antenna device. As shown in FIG. 10, according to the configuration of this embodiment, the planar antenna element unit 11 and the circuit board 13 can be integrated, so that the size can be reduced, and the connection with the planar antenna element unit 11 can be made directly. Since it can be performed, noise is less likely to enter and signal loss can be minimized.

Further, since the connector 13c is integrated and is fixed to the convex portion 13a-1 of the circuit board 13 and protrudes to the outside from the case member 14, connection to the inspection device can be easily performed and inspection efficiency can be improved. It is possible to improve the assemblage, and the mounting on the outer case becomes easy, so that the assemblability can be improved.

Further, also in the assembly of the device body 5, the planar antenna element portion 11 and the circuit board 23 can be fixed by soldering and the adhesive 12, and the circuit board 13 and the case member 14 can be fixed by soldering. After soldering, the cover member 15 is simply attached to the case member 14 to complete the assembly, the number of parts is small, and the assemblability is good. Further, the planar antenna element 11, the circuit board 13, and the case member 14 are soldered together. Since the planar antenna element 11 is integrally fixed and is securely held by the case member 14 by bending the claw portions 14a-1 to 14a-4 of the case member 14, the planar antenna element 11 is protected against vibration and impact. It has a strong structure. Such a structure is particularly effective when mounted on an automobile or the like.

When mounting the apparatus main body 5 on the outer case, the above-mentioned screw 8 is inserted into the through holes 12e-1 to 12e-4 of the mounting plate 12, and the screw 8 is attached to the mounting portion 6b of the inner case member 6. The device body 5 is fixed in the inner case 6 by being screwed into -1.

In this embodiment, the step portion 11a-1 is formed on the peripheral edge portion of the planar antenna element 11 to serve as the engaging portion with the claw portions 12a-1 to 12a-7 of the mounting plate 12. The present invention is not limited to this, and as shown in FIG. 11, a taper 11'a-1 may be formed on the peripheral edge of the planar antenna element 11 'to serve as an engaging portion.

[0043]

[Effect of device]

 As described above, according to the present invention, since the planar antenna element is held by bending the engaging claws of the mounting plate on the step formed on the peripheral portion of the planar antenna element, the characteristics of the antenna are ensured. It has a feature that it can be held without affecting the

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of the present invention.

FIG. 2 is an exploded perspective view of an apparatus main body according to an embodiment of the present invention.

FIG. 3 is a configuration diagram of a planar antenna element according to an embodiment of the present invention.

FIG. 4 is a configuration diagram of a mounting plate according to an embodiment of the present invention.

FIG. 5 is an assembly view of a planar antenna element and a mounting plate according to an embodiment of the present invention.

FIG. 6 is a configuration diagram of a circuit board according to an embodiment of the present invention.

FIG. 7 is a circuit block diagram of a circuit board according to an embodiment of the present invention.

FIG. 8 is a configuration diagram of a case member according to an embodiment of the present invention.

FIG. 9 is a configuration diagram of a cover member according to an embodiment of the present invention.

FIG. 10 is an assembly configuration diagram of an embodiment of the present invention.

FIG. 11 is a perspective view of another embodiment of the present invention.

FIG. 12 is a configuration diagram of a conventional example.

[Explanation of symbols]

 11 Planar Antenna Element 11a-1 Step 12 Mounting Plate 12a-1 to 12a-7 Claw 13 Circuit Board 14 Case Member 15 Cover Member

Claims (1)

[Scope of utility model registration request] 1. A planar antenna device having a planar antenna element having a flat receiving surface and a mounting plate for holding the planar antenna element, wherein the mounting plate engages with the planar antenna element. A planar antenna having an engaging claw for holding the planar antenna element, wherein the planar antenna element has a stepped portion at the periphery of which the engaging claw of the mounting plate is bent and engaged. apparatus.