JP3231997B2 - Film 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 film antenna, and more particularly, to a feed structure for the film antenna.

[0002]

2. Description of the Related Art Conventionally, in order to feed an antenna, it is necessary to connect, for example, a coaxial cable to a feed portion of an antenna element. In this case, in the power supply terminal, the power supply terminal connected to the coaxial cable is soldered, riveted, or screwed to the power supply portion of the antenna element. Further, since the power supply terminal is exposed, resin is sealed in the power supply terminal for waterproofing.

[0003]

However, in the prior art, as described above, soldering, riveting or screwing is required, and the operation is troublesome. In addition, poor soldering, poor crimping, or poor screwing is likely to occur, which tends to affect the electrical characteristics of the antenna. In addition, resin sealing is required for waterproofing, and further processing is troublesome.

An object of the present invention is to provide a film antenna in which a power supply terminal can be easily attached to a power supply unit. Another object of the present invention is to provide a film antenna that does not require waterproofing. Another feature of the invention is that
This will become apparent from the following description.

[0005]

According to the first aspect of the present invention, there is provided an antenna element having a feeder portion, both sides of which are covered with first and second resin films; A power supply terminal opposed to the power supply unit via the first resin film and capacitively coupled to the power supply unit. Further, the power supply terminal is
It is mounted on a flat power supply terminal mounting plate. This pay
When the terminal mounting plate comes into surface contact with the first resin film,
Is fixed to a lid which is in surface contact with the second resin film.
ing.

According to the first aspect of the present invention, the power supply section and the power supply terminal of the antenna element are arranged to face each other.
They are capacitively coupled to each other. Therefore, soldering, riveting, screwing, etc. are unnecessary. Moreover, since the antenna element is covered with the first and second resin films, the antenna element does not enter into the antenna element without special waterproofing. In addition, the power supply terminal and antenna
The element is sandwiched between the power supply terminal mounting plate and the lid.
Power supply terminal and antenna element
The part and the capacitive coupling are firmly maintained. And capacitively coupled
Even after a long time has passed since the
Sex does not fluctuate.

[0007]

[0008]

[0009] In the invention of claim 2 Symbol placing, in a film-like antenna according to claim 1 Symbol placement on the surface of the feeding terminal is provided for the feeding terminal mounting plate, the waterproof packing surrounds the feed terminal Is formed.

According to the invention of claim 2 Symbol placement, since the waterproof packing surrounding the feeding terminal are formed, even if water penetrates between the cover and the power supply terminal mounting plate, prevented by the waterproof packing Therefore, it is possible to prevent water from entering the power supply terminal side, and the electrical characteristics of the antenna element do not change due to aging.

[0011] In the present invention of claim 3 Symbol placement, the film-like antenna according to claim 2 Symbol placement, and the power supply terminal mounting plate and said lid are joined with the outside than the waterproof packing.

When the connection between the power supply terminal mounting plate and the lid is performed inside the waterproof packing, water easily enters the power supply terminal side from the connection portion. As a result, the electrical characteristics of the antenna element may fluctuate. However, in the invention described in claim 3 , since the connection between the power supply terminal mounting plate and the lid is performed outside the waterproof packing, even if water enters from the connection portion, the power supply terminal is not connected. Water ingress to the side is prevented by the waterproof packing. Therefore, the electrical characteristics of the antenna element do not change even if the waterproof resin processing is not performed.

[0013] The invention of claim 4 Symbol mounting, in a film-like antenna of claim 1, further comprising: a tubular portion formed integrally with the feeder terminal mounting plate, said feeder terminal mounting plate to the cylindrical portion The first and second opposed sides are formed to be exposed on the side.
A current-carrying plate formed integrally with the power supply terminal mounting plate and arranged so as to make surface contact with the first groove-wall, and contacting the second groove-wall from the current-carrying plate. And a claw projecting from

According to the invention of claim 4 Symbol mounting, since pawl projecting from the energization plate is in contact with the second groove wall, charged plates is pressed against the first groove wall, its position is fixed You. Therefore, the position of the power supply terminal formed integrally with the current-carrying plate is also fixed, so that the electrical characteristics of the antenna element do not change due to aging.

[0015] In the invention of claim 5 Symbol mounting, in a film-like antenna according to claim 4 Symbol mounting said pawl substantially perpendicular to protrude relative to charged plates from the energizing plate toward the second groove wall, the A first claw whose length is longer than a distance between the first and second groove walls; and a second claw that forms a non-perpendicular angle with respect to the energizing plate. I have.

According to the invention of claim 5 Symbol mounting, the length of the first pawl is longer than the distance of the first and second groove walls,
The pawl firmly presses the current-carrying plate against the first groove wall. Therefore, the position of the power supply terminal is firmly fixed, and the electrical characteristics of the antenna element do not fluctuate, as in the fourth aspect of the invention. In addition, since the second claw makes a non-perpendicular angle with respect to the power supply plate and is in contact with the second groove wall, the position of the power supply terminal is fixed, and the power supply plate is prevented from falling out of the groove. Preventing.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS This embodiment has an antenna element 2 as shown in FIG. This antenna element 2
Has, for example, a planar antenna element 4 to be attached to a roof or the like. This planar antenna element 4 is shown in FIG.
As shown in FIG. 1, a dipole antenna is formed by applying a conductive thin film, for example, a metal thin film to one surface of a first resin film, for example, a thin insulating film 6. The length of the planar antenna element 4 is selected so that, for example, all channels in the VHF band can be received.
The planar antenna element 4 is not limited to receiving all television broadcast waves in the VHF band.
It may be for low-band reception or high-channel reception in the band, or for all-channel reception or partial-channel reception in the UHF band. The planar antenna element 4 has a pair of feed portions 4a and 4b at the ends thereof so as to be located on the same straight line.

As shown in FIG. 3, the first resin film 6
At the same time, a second resin film, for example, a thin insulating film 8 is applied to the upper surface of the planar antenna element 4 so as to sandwich the planar antenna element 4 in a sandwich shape. Since the first and second resin films 6 and 8 and the planar antenna element 4 are thus laminated, the planar antenna element 4 is watertight.

Feeders 4a and 4b of the planar antenna element 4
In order to supply power to the power supply, a power supply tool 10 is provided. The power supply 10 has a cylindrical main body 12. On the upper surface of the main body 12, a flange-shaped power supply terminal mounting plate 14 is formed integrally with the main body 12 and substantially vertically. The power supply terminal mounting plate 14 has a pair of power supply terminals 16a, 1
6b are formed on the same straight line.

The power supply 10 is in surface contact with the lower surface of the first resin film 6 so that the power supply terminals 16a and 16b are located at the power supply portions 4a and 4b of the planar antenna element 4, respectively. Are arranged as follows. That is, the power supply terminals 16a and 16b face the power supply units 4a and 4b via the first resin film 6. Therefore, the power supply terminals 16 a and 16 b and the power supply portions 4 a and 4 b are capacitively coupled via the first resin film 6.

Frequency vs. VSW of this planar antenna element 4
FIG. 4 shows the R characteristics. As is clear from this figure, this planar antenna element has a low channel of 90 MHz.
A maximum VSWR of about 1.3 is obtained at z to 108 MHz. 170MHz to 22 which is high channel
At 2 MHz, a VSWR of up to about 1.7 is obtained.
Therefore, a sufficiently practical performance can be obtained.

Further, since the capacitive coupling is used as described above, the power supply terminals 16a and 16b and the power supply portions 4a and 4a
No electrical connection with b is required, such as soldering, riveting or screwing. Moreover, in order to make the above-mentioned electrical connection, the first resin film 6 separates the power supply portions 4a and 4a from each other.
It is not necessary to expose b, and it is possible to prevent the power supply units 4a and 4b from being corroded.

Then, as shown in FIGS. 5 and 6, the second
A lid 18 is arranged on the surface side of the resin film 8 so as to be in surface contact therewith. Lid 18 and power supply terminal mounting plate 14
Are connected as described later. Accordingly, the capacitive coupling between the power supply terminals 16a and 16b and the power supply portions 4a and 4b is firmly maintained, and the mechanical positional relationship between the two does not shift.

Each of the power supply terminals 16a and 16b is introduced into the main body 12 as shown in FIG. 6, and is provided at the lower part of the main body 12 through a matching device 19 provided in the main body 12. 20. This coaxial connector 20 is connected to a plug 23 connected to a coaxial cable 22 as shown in FIG. The coaxial cable 22 is connected to a receiver or the like (not shown). As described above, since the mechanical positional relationship between the power supply terminals 16a and 16b and the power supply units 4a and 4b does not shift, the electrical characteristics of the antenna element 4 as viewed from the receiver or the like will not change even if the time passes. It does not change.

As shown in FIG. 7, another cover 24 is attached to the outer periphery of the main body 12 via a waterproof packing 26, and the inside of the main body 12 and the coaxial connector 2 are connected.
0. Water is prevented from entering the contact portion of the plug 23. For the same reason, a waterproof cap 28 is also attached to the plug 23.

As shown in FIG. 1, the power supply terminals 16a, 16a
A waterproof packing 30 is provided so as to surround the periphery of b. That is, as shown in FIG.
The waterproof packing 30 is inserted into a groove 32 formed around the periphery of the groove 16b. This waterproof packing 30
Since the cover 18 is pressed toward the power supply terminal mounting plate 14, it is possible to prevent water from entering inside the waterproof packing 30. Therefore, corrosion of the surfaces of the power supply terminals 16a and 16b can be prevented.

As shown in FIG. 8, one end of the power supply terminal 16a is connected to the power supply plate 3 at an obtuse angle with respect to the power supply terminal 16a.
4a are formed. The power supply plate 34a connects the lead wire connecting portion 36a for connecting to the matching device 19 to the power supply terminal 16.
a at the end opposite to the connected end.
The pawls 37a and 38a are connected to the power supply terminal 1
6a protrudes in the same direction as the protruding direction.

Similarly, the claws 37a on the power supply plate 34a,
By cutting and raising the portion between 38a, the claw 40a
Are formed. The claw 40a is connected to the lead wire connecting portion 3
With the base 6a as a base end, it is formed so as to face the power supply terminal 16a at a non-perpendicular angle, for example, an acute angle with respect to the power supply plate 34a. The claw 40a is connected to the power supply terminal 1 on the contrary.
With the base 6a as a base end, the conductive plate 34a may be formed at a non-perpendicular angle, for example, at an acute angle to the lead wire connecting portion 36a.

Similarly, a current supply plate 34b is connected to the power supply terminal 16b.
It has a lead wire connection portion 36b and claws 37b, 38b, 40b.

As shown in FIG. 7, rectangular grooves 42a, 4a are formed in the main body 12 so as to be exposed on the side of the power supply terminal mounting plate 14.
2b is formed. In these grooves 42a and 42b,
The power supply plates 34a and 34b are inserted. Grooves 42a, 4
Since 2b has the same structure, only the groove 42a will be described.

The groove 42a has opposed groove walls 44a and 46a as shown in FIG. The conducting plate 34a is in surface contact with the groove wall 44a. At this time, the cut-and-raised angle and length of the claw 40 are selected so that the tip thereof contacts the groove wall 46a. Therefore, the energizing plate 34a is prevented from coming off the groove 42a by being pressed against the groove wall 44a. At the same time, the movement of the conductive plate 34a to the groove wall 46a is prevented.

The length of the claws 37a, 38a, that is, the length from the side of the conducting plate 34a to the tip thereof is selected to be slightly larger than the dimension between the groove walls 44a, 46a. Therefore, when inserted into the groove 42a from above the lead wire connecting portion 36a, as shown in FIG.
The current-carrying plate 34a is pressed against the groove wall 42a by the spread of the grooves a and 38a in the groove 42a. Therefore, the conductive plate 34a does not move in the groove 42a. The energizing plate 34b is also housed in the groove 42b.

As shown in FIG. 10, the conductive plate 34a is
When inserted into 2a, the power supply terminal 16a protrudes from the power supply terminal mounting plate 14. In this state, the feeding units 4a and 4b of the planar antenna element 4 are connected to the feeding terminals 16a and 16a.
b, and the feed terminals 16a, 1
6b is pressed against the power supply terminal mounting plate 14 side.
8 is mounted on the power supply terminal mounting plate 14.

If the claws 37a, 38a and 40a are not provided, the conducting plate 34a has an upper end on the groove wall 46a side,
The lower end may be in an oblique state with the groove wall 44a side.
Moreover, this oblique state is not always constant. Therefore, the electrical characteristics of the antenna element 2 become unstable.

However, in this embodiment, the claws 37a,
38a, 40a, so that the current-carrying plate 34a
Are maintained in surface contact with the groove wall 44a. Therefore, the electrical characteristics of the antenna element 2 become constant. . Although only the energizing plate 34a has been described, the energizing plate 34a
The same applies to b.

The connection between the power supply terminal mounting plate 14 and the lid 18 will be described. As shown in FIG.
The screw holes 50 are formed at four places outside of. Further, positioning pins 52 are formed at four locations on the outside. In addition, screw insertion holes 54 are formed at four positions corresponding to the screw holes 50 around the feeding portions 4a and 4b of the antenna element 4, respectively. Pin holes 56 are formed outside the screw insertion holes 54 so as to correspond to the respective positioning pins 52. Therefore,
By inserting the positioning pins 52 into the pin holes 56, the power supply portions 4a and 4b face the power supply terminals 16a and 16b, and the screw holes 50 and the screw insertion holes 54 coincide.

A similar pin hole 58 is formed in the lid 18. The positioning pins 52 are inserted through these pin holes 58, and the position of the lid 18 is determined. In this positioned state, a countersunk screw seat surface receiver 60 is formed on the lid 18 such that the screw hole 50 and the screw insertion hole 54 match. The countersunk screw seat receiver 60 and the screw insertion hole 54
Are screwed into the screw holes 50, and the cover 18 and the power supply terminal mounting plate 14 are fixed. As a result, as shown in FIG.
b is bent.

The fixing of the cover 18 and the power supply terminal mounting plate 14 by the flathead screws 62 is performed outside the waterproof packing 30. Therefore, even if water enters the power supply terminal mounting plate 14 side from the pin holes 56 and 58, the countersunk screw seat surface receiver 60, the screw insertion hole 54, and the like, the waterproof packing 30
Power supply terminals 16a, 16b
Corrosion by water can be prevented.

[Brief description of the drawings]

FIG. 1 is an assembly view of an embodiment of a film antenna according to the present invention.

FIG. 2 is a plan view of the embodiment.

FIG. 3 is a vertical sectional side view of the antenna element of the embodiment.

FIG. 4 is a diagram showing a frequency vs. VSWR characteristic of the embodiment.

FIG. 5 is a partially omitted cutaway side view showing an assembled state of the antenna element and the feeder according to the embodiment.

FIG. 6 is a partially omitted cutaway front view showing a coupling state between the antenna element and the power supply tool in the embodiment.

FIG. 7 is a longitudinal sectional side view showing an assembled state of a power supply device and an antenna element in which a waterproof cap and a connector with a coaxial cable are connected in the embodiment.

FIG. 8 is a perspective view of a power supply terminal and a power supply plate used in the embodiment.

FIG. 9 is an enlarged view of a portion A in FIG. 7;

FIG. 10 is a diagram corresponding to FIG. 9, showing a state before a lid is attached in this embodiment.

FIG. 11 is a plan view showing a state in which a current-carrying plate is attached to a groove in this embodiment.

[Explanation of symbols]

 Reference Signs List 2 antenna element 4 planar antenna element 4a 4b feeding section 6 first resin film 8 second resin film 12 main body section (cylindrical section) 14 feeding terminal mounting plate 16a 16b feeding terminal 18 lid 30 waterproof packing 34a 34b conducting plate 37a 38a 40a Claw 42a 42b Groove 44a First groove wall 46a Second groove wall

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-82701 (JP, A) JP-A-7-297624 (JP, A) JP-A-63-46803 (JP, A) JP-A-7-297 94937 (JP, A) Japanese Utility Model 4-55809 (JP, U) Japanese Utility Model 1-91310 (JP, U) Japanese Utility Model 7-42210 (JP, U) Japanese Utility Model 5-43608 (JP, U) HEIQ 5-68108 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01Q 1/40 H01Q 9/06

Claims (5)

(57) [Claims] 1. A planar antenna element having a feeding unit,
An antenna element whose both surfaces are covered with first and second resin films, and a power supply terminal opposed to the power supply unit via the first resin film and capacitively coupled to the power supply unit. The power supply terminal is mounted on a flat power supply terminal mounting plate.
The power supply terminal mounting plate is attached to the first resin filler.
With the surface of the second resin film
Film antenna fixed to the lid . 2. A film antenna according to claim 1,
There are, the power supply terminal on the surface of the feeding terminals are provided in the mounting plate, a film-like antenna waterproof packing surrounding said feeding terminals are formed. 3. The film antenna according to claim 2,
And a film-like antenna in which the power supply terminal mounting plate and the lid are fixed outside the waterproof packing. 4. The film-shaped antenna according to claim 1, wherein a cylindrical portion formed integrally with the power supply terminal mounting plate, and the cylindrical portion is formed so as to be exposed to the power supply terminal mounting plate side. A groove having first and second groove walls to be formed; a current-carrying plate formed integrally with the power supply terminal mounting plate and arranged so as to make surface contact with the first groove wall; A film antenna comprising: a claw protruding so as to contact a groove wall. 5. The film-shaped antenna according to claim 4 , wherein the claw projects substantially perpendicularly to the conductive plate from the conductive plate toward the second groove wall, and has a first and a second length. A film-shaped antenna comprising: a first claw formed to be longer than a distance between two groove walls; and a second claw formed at a non-perpendicular angle with respect to the conductive plate.