JPH02113604A - Manufacture of conical spiral antenna and conical spiral antenna and curved line-shaped plane dielectric substrate used for manufacture - Google Patents

Abstract

PURPOSE:To obviate the conductor connection, to easily and rapidly execute the manufacturing work and to manufacture an accurate conical spiral antenna by forming a conducting pattern on a flexible plane dielectric substrate in a continuous curved line shape drawn at the time of developing along the spiral, curving in a conical surface and fixing a shape. CONSTITUTION:After a substrate 11 is cut out by the developed shape, a substrate 31 is curved and fixed to a male type 41 having a conical surface at the outer surface and a dielectric film sheet held to a female type having the conical surface at the inner surface is fixed on the outer surface of the substrate 31. Consequently, since conductor patterns 21a and 21b are formed in a continuous spiral shape, they are conically bent and assembled. Thus, a conical spiral antenna having a continuous spiral conductor pattern can be easily and rapidly manufactured. Since by the dimension and shape of the conductor patterns 21a and 21b formed on the plane dielectric substrate 11, the dimension after construction and the shape of the manufactured conical spiral antenna are determined, for the completed conical spiral antenna, the dimension accuracy is good, the characteristic performance is also satisfactory and the quality for a product is constant.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to a conical spiral antenna mounted on a ship, aircraft, etc. and used for wideband scanning, and in particular,
A method for manufacturing a conical helical antenna from a flexible planar dielectric substrate, a conical helical antenna manufactured by the method, and a curved plate used for manufacturing the same.

[Prior Art] As a conventional method for manufacturing a conical spiral antenna from a dielectric substrate, a flexible planar dielectric substrate l is formed into a fan shape as shown in FIG. There is a manufacturing method in which a conductor pattern 2 is formed, and then the substrate is formed into a conical shape as shown in FIG. (See Japanese Patent Application Laid-Open No. 61-50404).

Another method is to wind a metal wire around a tapered core and then remove the core (Japanese Unexamined Patent Publication No. 134104/1983).

Still another method is to form a spiral pattern by rotating a conical dielectric (Japanese Unexamined Patent Publication No. 62-230202).

[Problems to be Solved by the Invention] However, in the conventional method of applying zero force as described in JP-A No. 61-50404, when a fan-shaped flat substrate is assembled into a conical shape, a discontinuous conductive pattern cannot be formed. It is necessary to connect the bridges with a shade to make them continuous. This work is complicated and time-consuming, and errors are likely to occur during the assembly process, resulting in the completed antenna having poor accuracy and poor reception characteristics for radiated electromagnetic waves.

In addition, in the conventional method described in JP-A-61-134104, the process of winding a metal wire around the core for plastic deformation and then removing the core is a cumbersome process. Also, when winding the metal wire side around the core, assembly errors were likely to occur.

In the conventional method described in Japanese Unexamined Patent Publication No. 62-230202, the process of forming a spiral pattern was complicated because the conical dielectric body was not rotated.

The present invention provides a method for manufacturing a conical helical antenna with simple, quick and accurate manufacturing operations without the need for connecting conductors, and a conical helical antenna manufactured by the method. is intended to provide.

[Means for Solving the Problems 1] In order to achieve the above object, the present invention provides the following features: 1. Forming a conductor pattern in a continuous curved shape on a flexible planar dielectric substrate. After the first step, the dielectric substrate is curved into the conical shape and the shape is fixed.

Note that the substrate is generally made of a dielectric material such as epoxy fiber glass, Teflon, or Boliimi 1~, and the conductor is
Made of metal such as copper.

Furthermore, the spiral conductor pattern may consist of one or more spirals.

Further, the first step may include a step of cutting the substrate into a shape in which a conical surface is expanded along the curve.

Further, the first step includes a step of cutting the substrate into a shape with a gluing margin added around the shape of the conical surface developed along the curve, and the second step includes cutting the substrate into a shape with a gluing margin added to the periphery of the conical surface developed along the curve, and the second step includes cutting the substrate into a shape with a gluing margin added to the periphery of the conical surface developed along the curved line. There may also be a step of adhering and fixing.

Further, the second step may include a step of curving the substrate, wrapping it around the outer surface of the conical dielectric having a conical surface, and fixing the substrate.

In addition, in a method for manufacturing a conical helical antenna from a flexible planar dielectric substrate, a continuous curved line drawn when a conical surface L converges from the bottom to the apex is expanded along the helix. , a step of forming a conductor pattern on the substrate; after the step of forming the conductor pattern, a step of cutting the substrate into a shape with a conical surface expanded along the curve; and a step of cutting the substrate into the expanded shape. , a step of curving and fixing the substrate to a male mold having a conical surface on its outer surface; After the step of curving and fixing the substrate, a dielectric film sheet held by a female mold having a conical surface on its inner surface; The method may consist of a step of fixing the dielectric film sheet to the outer surface of the substrate, and a step of removing the substrate from the male mold after the step of fixing the dielectric film sheet.

The invention also consists of a conical helical antenna manufactured by these methods.

Furthermore, a flexible planar dielectric substrate having a continuous curved conductor pattern drawn when a conical spiral converging from the bottom to the apex is developed along the spiral is formed into a conical shape. The antenna may also consist of a conical helical antenna formed by winding and cutting.

The present invention further includes a continuous curved conductor pattern drawn when a conical spiral converging from the bottom to the apex is developed along the spiral, and It is made of a flexible curved planar dielectric substrate that has an expanded conical shape.

[Operation] Since the conductor pattern is formed in a continuous spiral shape, a conical spiral antenna having a continuous spiral conductor pattern can be easily and quickly manufactured by bending it into a conical shape and assembling it.

In addition, the dimensions and shape of the conductor pattern formed on the planar dielectric substrate 1 determine the finished dimensions and shape of the manufactured conical spiral antenna, so the completed conical spiral antenna has dimensional accuracy. It is strong, has good characteristic performance, and the quality of each product is constant.

[Example] An example will be described with reference to the drawings. In FIG. 2, after a conductor layer made of copper is deposited on the surface of a planar flexible dielectric substrate 11 made of Teflon,
The dielectric layer is photographed to form curved conductor patterns 21a and 21b (first step).

The conductive pattern 21a is located on the outside when assembled into a conical shape, and the conductive pattern 21b is located on the inside when assembled into a conical shape. This pattern 21a, 2
1b is a conical surface 1-2 converging from the bottom to the apex.
It is formed in the shape of two consecutive wooden curves that are drawn when a wooden spiral is expanded along the spiral.

Next, when the substrates 11 in FIG. 2 are assembled into a conical shape,
A line 23 corresponding to the outer edge 22 of the conductor pattern 21a,
A curved line is cut along the line 24 forming the base circle of the cone, the outer edge 22 of the conductor pattern 21a, and the line 25 forming the top (see FIG. 3). This cut curved plate 31 has the shape of an expanded conical spiral antenna.

Next, as a second step, the curved substrate 31 is bent and wrapped around the male mold 41 and fixed (see FIG. 1). The male type 41 has a cone 44 at the center of the upper surface 43 of the cylindrical base 42.
It consists of a fixed bottom surface. The cone 44 has the same conical surface as the conical helical antenna to be manufactured.

First, adhesive is applied to the surface of the cone 44. This adhesive is an organic adhesive that is soluble in organic solvents.

The curved substrate 31 spirally wraps around the cone 44 of the male mold 41 such that the line 24 forms the base circle of the cone, the outer edge 22 coincides with the line 23, and the line 25 forms the top. . Also,
Wind the wire 24 so that it coincides with one end 26 or the other end 27.

Next, a fan-shaped dielectric film sheet 1 as shown in FIG.
~ Prepare 51. This fan-like shape is formed by expanding the conical surface of the conical spiral antenna to be manufactured.

Apply thermosetting adhesive to one side of these sheets 1 to 51.
j. Place the sheet 1 with the adhesive-applied side facing inside.
-51 is curved into a conical shape to form a conical film 52.

Next, as shown in FIG. 5, the conical film 52 is inserted into the female mold 61. The female die 61 is hollowed out in the shape of a cone 64 so that the inside of the cylinder 62 coincides with the center of the bottom surface 65 of the cone 64 or the bottom surface 63 of the cylinder 62. The cone 64 has a shape and size that match the I'I 31F film 52.

Since the conical film 52 tends to open outward due to its elasticity, it is held inside the female mold 61 in alignment with the cone 64 of the female mold 61 .

Next, the male mold 41 wrapped around the curved substrate 31 as shown in FIG. 1 is inserted into the female mold 61 holding the conical film 52 as shown in FIG. 5 (see FIG. 6). Then, the bottom surfaces 63 and -1, and 43 are joined by means (not shown in detail).

Next, this joined body of the male mold 41 and the female mold 61 is heated. By this heating, the adhesive applied to the conical film 52 is cured, and the conical film 52 is adhered to the surface of the curved substrate 31.

Finally, remove the screws and remove the female mold 6 from the male mold 41. Further, the organic adhesive fixing the curved substrate 31 to the male mold 41 is washed away with an organic solvent. A curved substrate 31 with a conical film 52 fixed on the surface is attached to a male mold 41.
By removing it from the base, the conical spiral antenna is completed.

In this way, since the conductor patterns 21a and 21b are formed in a continuous spiral shape, by conically curving and assembling them, a conical helical antenna is formed by forming the continuous spiral conductor patterns.

Next, a second example will be described.

FIG. 7 shows a second embodiment of the invention.

In this example, a cone-shaped dielectric 71 having the same shape, size and dimensions as the cone 44 of the male type 41 used in the first example was prepared, and a cone-shaped dielectric 71 similar to that used in the first example was prepared. A conical spiral antenna is manufactured by applying an adhesive and wrapping a curved substrate 31 (not shown in FIG. 3) around this -L.

In this embodiment, it is better to use the method of the first embodiment, that is, to wrap the curved substrate 31 around the male mold 41 coated with adhesive and then fix the conical film 52 to the surface of the curved substrate 31. , it can be manufactured easily and quickly.

Next, a third example will be described.

In this embodiment, as shown in FIG. 8, adhesive margins 82 and 83 are provided outside the outer edge 22 and line 23 of the curved substrate 31 shown in the third section 1 of the first embodiment. , constitutes a curved substrate 31. Then, the same adhesive and 7+ agent as in the first embodiment is applied to the surface of the glue 1 margin 82.
The front surface of the adhesive portion 83 is overlapped with the back surface of the adhesive portion 83 and bonded. In this way, a conical spiral antenna is manufactured.

In this embodiment, the first embodiment 1, that is, the male type 4
1 and dielectric film sheet 1-51, and method D of the second embodiment, that is, method D using the conical dielectric material 71, it can be manufactured simply and quickly using fewer materials. This is a method to

[Effects of the Invention 1] The present invention is constructed as described in J-4 below, and achieves the effects described below.

By bending it into a conical shape, assembling it, and putting it out, it is possible to quickly manufacture a conical spiral antenna in a cylinder.

The completed conical spiral antenna has good dimensional accuracy and good characteristic performance, and the product quality is constant.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing a planar dielectric substrate curved and assembled into a conical shape by the method of the first embodiment, and Fig. 2 is a -i
F side view, Figure 3 shows the planar dielectric substrate in Figure 2 as a circle g JM
FIG. 4 is a plan view of the dielectric film sheet 1-, FIG. 5 is a perspective view showing the state 1 in which the film sheet is inserted into the female shape, and FIG. 7 is a perspective view showing a fish in which a male shape is inserted into a female shape in which film seams 1 to 1 are inserted, and FIG.
J, a planar dielectric substrate is curved into a conical shape 4-
1) A perspective view showing a state in which a conductive pattern is formed by the method of the first embodiment, FIG. FIG. 1O is a perspective view of a planar dielectric substrate used in the conventional method; FIG. 11 is a perspective view of a conical spiral antenna manufactured by the conventional method D. It is a diagram. 11... Planar flexible vine dielectric substrate 21a, 2
1b...Conductor pattern 31...Curved substrate 41...Male type 52...Conical film 61...Female type 71...Conical dielectric 82.83...Norishiro Applicant Co., Ltd. Tokyo Tech 1 representative Patent attorney L Goshin Mayo (2 others) Fig. Fig. Fig. 10

Claims (1)

[Claims] 1. In a method for manufacturing a conical spiral antenna from a flexible planar dielectric substrate, the antenna is drawn when a spiral converging from the bottom to the apex on a conical surface is expanded along the spiral. , a first step of forming a conductive pattern on the substrate in a continuous curved shape, and a second step of curving the substrate into the conical shape after the first step and fixing the shape. A method of manufacturing a conical helical antenna characterized by: 2. The method according to claim 1, wherein the first step includes the step of cutting the substrate into a shape in which the conical surface is expanded along the curve. 3. The first step includes the step of cutting the substrate into a shape with a margin around the expanded shape of the conical surface along the curve; 2. The method according to claim 1, comprising the step of overlapping and bonding the adhesive margins and fixing them. 4. The method according to claim 1 or 2, wherein the second step comprises the step of bending the substrate, wrapping it around the outer surface of the conical dielectric having the conical surface, and fixing it. 5. In a method for manufacturing a conical spiral antenna from a flexible planar dielectric substrate, a continuous curved shape drawn when a spiral converging from the bottom to the apex on a conical surface is expanded along the spiral, forming a conductive pattern on the substrate; after forming the conductive pattern, cutting the substrate into a shape in which the conical surface is developed along the curve; and cutting into the developed shape. After the step, the substrate is curved and fixed to the male mold having the conical surface on the outer surface, and after the step of curved and fixed, the substrate is held by the female mold having the conical surface on the inner surface. a conical spiral comprising the steps of: fixing a dielectric film sheet to the outer surface of the substrate; and removing the substrate from the male mold after fixing the dielectric film sheet. How to manufacture an antenna. 6. A conical helical antenna manufactured by the method according to claim 1, 2, 3, 4 or 5. 7. A flexible planar dielectric substrate having a continuous curved conductor pattern drawn when a conical spiral converging from the bottom to the apex is developed along the spiral; A conical spiral antenna that is wrapped around the. 8. It has a continuous curved conductor pattern that is drawn when a conical surface-shaped spiral converging from the bottom to the apex is developed along the spiral, and the conical surface is drawn along the curved line. A flexible curved planar dielectric substrate having an expanded shape.