JPH0629714A - Helical antenna for satellite communication - Google Patents

Abstract

PURPOSE:To provide a helical antenna for satellite communication having high quality around which helical coils different by winding directions, pitches, and modes are wound with the spool of the same type and which eliminates the influence of the dielectric forming the spool upon the antenna characteristics and is produced with the less man-hour in winding and a low cost and does not generate bending parts or the like in helical coils. CONSTITUTION:First and second groove groups 13a and 13b are formed in the symmetrical positions of respective front end edge parts of first and second supporting members 12a and 12b facing each other in the positions different by 180 deg. out of first to fourth supporting members 12a to 12d, which are provided on the outer peripheral surface of a bar-shaped base body 11 so that they are present on two planes which include the central axis of the bar-shaped base body 11 and are intersected orthogonally with each other, with a prescribed pitch, and third and fourth groove groups 13c and 13d are formed in the symmetrical positions of respective front end edge parts of third and fourth supporting members 12c and 12d facing each other in positions, which are shifted from first and second supporting members by 90 deg. and are different by 90 deg., with a prescribed pitch in the states shifted from first and second groove groups by 1/2 pitch.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a helical antenna for satellite communication in which a conductor is spirally wound around a winding frame made of a cylindrical or columnar insulating member.

[0002]

2. Description of the Related Art As a conventional helical antenna for satellite communication of this kind, a spiral groove is formed on the outer peripheral surface of a cylindrical winding frame made of a dielectric material and having a relatively large wall thickness. There is a helical coil in which a conductor wire is wound in the groove.

Further, as disclosed in Japanese Utility Model Laid-Open No. 3-32811, a plurality of rectangular ribs are radially provided on the outer peripheral surface of a cylinder, and through holes for inserting a spiral element are formed at the end portions of these ribs. A helical antenna is known in which a spiral element (helical coil) which is provided in these through-holes and which is formed in a coil shape in advance is sequentially screwed in from its end portion.

[0004]

In the former case, since the winding pitch of the helical coil is specified by the spiral groove formed on the outer peripheral surface of the winding frame, the helical coil of the same type is used and the helical coil of different pitch is used. It is impossible to wind up. Of course, it is impossible to wind helical coils in different winding directions. Further, since the helical coil is wound in a winding frame made of a dielectric having a predetermined permittivity, the helical permittivity of the dielectric has a considerable influence on the antenna characteristics.

In the latter case, a spiral element (helical coil) formed in a coil shape in advance is attached to a through hole for inserting a spiral element formed at an end portion of a rectangular rib by sequentially screwing the spiral element from the end portion. Therefore, there is a drawback that the number of winding steps is very large and the cost is high.
Further, depending on how the spiral element (helical coil) is inserted into the through hole, a partial bending portion or distortion is generated in the helical coil. For this reason, there is a possibility that a large variation will occur in the form of the helical coil after completion and the quality will be deteriorated.

Therefore, the present invention is capable of winding helical coils having different winding directions, pitches, and modes using the same type of reel, and further, the antenna made of a dielectric material forming the reel. There is almost no effect on the characteristics, the workability of the winding is remarkably good, the number of winding steps is small, it can be manufactured at low cost, and there is no need for partial bending or distortion of the helical coil. , To provide a high quality helical antenna for satellite communication.

[0007]

[Means for Solving the Problems] In order to solve the above problems and achieve the object, the present invention takes the following means. That is, in a helical antenna for satellite communication in which a lead wire is spirally wound around a winding frame, the helical antenna for satellite communication includes the central axis of a rod-shaped base having a tubular shape or a columnar shape, and is present in two planes orthogonal to each other. Rectangular plate-shaped first to fourth support members are radially provided at four locations on the outer peripheral surface of the rod-shaped substrate, and the first to fourth support members are opposed to each other at angular positions different from each other by 180 °. The first and second support members are provided with first and second groove groups for engaging the lead wire at a predetermined pitch at symmetrical positions of the respective tip edge portions of the first and second support members. 18 at a position offset by 90 °
The tip edges of the third and fourth support members facing each other at an angle position different by 0 ° are symmetrically displaced from each other by a predetermined pitch and by a 1/2 pitch from the first and second groove groups. In this state, a winding frame formed by forming third and fourth groove groups for engaging the conducting wire is provided.

It is preferable that the winding frame is provided so that adjacent end faces of a plurality of rod-shaped bases having a cylindrical or columnar shape can be connected to each other at a specific angular position in the axial direction. Further, as the winding frame, a cylindrical or columnar rod-shaped base body and rectangular plate-shaped first to fourth support members are separately formed, and the first to fourth support members are formed on the outer circumference of the rod-shaped base body. It is preferable that the fourth support member is detachably provided.

[0009]

As a result of taking the above-mentioned means, the following effects occur.

(1) The guide wire engaging groove groups provided at the respective leading edge portions of the supporting member are adjacent to each other in both the right axis direction and the left axis direction. In the interval, the helical coils are in a state of being sequentially displaced by 1/2 pitch so as to correspond to the spiral shape of the helical coil. Therefore, the winding method of the helical coil is not limited to right-handed winding or left-handed winding, and it is possible to arbitrarily wind helical coils in different winding directions using the same type of winding frame.

(2) When winding the conductor wire, which groove in each groove group for inserting the conductor wire is a matter which can be arbitrarily selected according to the intended purpose. Therefore, the winding pitch and the like can be appropriately changed depending on how the groove is selectively used when winding the conductor wire. For this reason, it is possible to wind the helical coils at different pitches, or to wind them in different modes, using the same type of reel.

(3) The helical coil is supported by each tip edge portion of a support member having a rectangular plate shape, and is held in a state of being separated from the outer peripheral surface of the rod-shaped base body by a predetermined distance. Therefore, the influence of the dielectric constant of the dielectric material forming the rod-shaped base on the antenna characteristics can be almost eliminated.

(4) The helical coil can be wound by simply winding the conductor wire into each groove group provided at each tip edge portion of the support member, and thus, for example, a rectangular rib. The workability of the winding is better than that of the conventional one, in which the helical element (helical coil) is sequentially screwed into the through hole formed in the end edge portion to wind the helical coil. Is remarkably good, and the winding man-hour can be greatly reduced. Further, since it is not necessary to apply an unreasonable external force to the conducting wire during the winding operation, it is not necessary to generate a partial bending portion or distortion in the formed helical coil. Therefore, the quality of the helical coil after completion can be improved, and a high quality helical antenna for satellite communication can be obtained.

[0014]

1 is a perspective view showing a schematic structure of a helical antenna for satellite communication according to a first embodiment of the present invention. FIGS. 2A and 2B and FIGS. 3A and 3B are a front view and an end view showing a main configuration of a winding frame and a helical coil of the satellite communication helical antenna according to the embodiment.

As shown in FIG. 1, the helical antenna for satellite communication comprises a winding frame 10 made of an insulating material and a helical coil 20 formed by spirally winding a conductive wire. In the helical coil 20, first and second coils 21 and 22 are wound in a so-called multiple winding state around a power feeding section 30 existing at the tip of the antenna. The power feeding unit 30 is connected to a tip end portion of a coaxial cable 40 that passes through a central portion of the cylindrical rod-shaped base body 11 of the winding frame 10. A coaxial cable connector 50 is attached to a base end portion of the coaxial cable 40 which is led to the bottom side of the winding frame 10. When used, the helical antenna for satellite communication is covered with a cover 60 shown by an alternate long and two short dashes line on the outer periphery thereof.

2 (a) and 2 (b) and FIG. 3 (a).
As shown in (b), the winding frame 10 includes a cylindrical rod-shaped base body 11, rectangular plate-shaped first to fourth support members 12a to 12d provided on the outer periphery of the rod-shaped base body 11, and the support. Each of the members 12a to 12d is provided with a groove group 13a to 13d for engaging a conductor, which is provided at each tip edge portion. In this embodiment, the rod-shaped base 11 and the first to fourth support members 12a to 12d are integrally formed of an insulating material.

The first to fourth support members 12a to 12d are
Radial (cross-shaped) projections are provided at four locations on the outer peripheral surface of the rod-shaped substrate 11 so that they respectively exist in two planes that include the central axis of the rod-shaped substrate 11 and are orthogonal to each other. Among the first to fourth support members 12a to 12d, the wire guides are arranged at symmetrical positions of the respective leading edge portions of the first and second support members 12a and 12b facing each other at angular positions different from each other by 180 °. The required first and second groove groups 13a and 13b are formed at a predetermined pitch P. Third and fourth support members 12c, 1 facing each other at an angle position different from each other by 180 ° at a position shifted from the first and second support members by 90 °.
At a symmetrical position of each tip edge portion in 2d, at a predetermined pitch P and 1 / second with the first and second groove groups 13a and 13b.
The third and fourth groove groups 13c and 13d for engaging the conducting wire are formed in a state of being displaced by two pitches. In this embodiment having such a configuration, the following operational effects are obtained.

Each of the groove groups 13a to 13 for engaging the conducting wire, which are provided at the respective leading edge portions of the supporting members 12a to 12d.
d is an adjacent support member, that is, 12a-12c, when viewed in either the right-hand axis direction or the left-axis direction.
12c-12b, 12b-12d, and 12d-12a are sequentially shifted by 1/2 pitch so as to correspond to the helical shape of the helical coil 20. Therefore, the helical coil 20 need not be specified as a right-handed or left-handed winding, and may be wound as a right-handed coil 20A as shown in FIG.
It is also possible to wind as a left-handed coil 20B as shown in FIG. Therefore, it is possible to arbitrarily wind the helical coils 20A and 20B in different winding directions by using the winding frame 10 of the same type.

When winding the conductor wire around each of the groove groups 13a to 13d for engaging the conductor wire, which groove in each of the groove groups 13a to 13d is to be wound can be arbitrarily selected according to the intended purpose. Is. Therefore, the winding pitch and the like can be appropriately changed depending on the selection situation of the groove that is selectively used when winding the conductor wire. Therefore, it is possible to wind the helical coils 20 at different pitches (for example, 2P, 3P ...) Using the same type of reel 10.
In addition, a different mode (for example, 1P and 2P are mixed)
It is also possible to wind up.

The helical coil 20 is supported by the tip edges of the supporting members 12a to 12d each having a rectangular plate shape, and is held at a distance L from the outer peripheral surface of the rod-shaped base 11. Therefore, even if the dielectric constant of the rod-shaped substrate 11 is large, the influence of the dielectric on the antenna characteristics can be almost eliminated.

The helical coil 20 can be wound by simply winding the conductor wire into the groove groups 13a to 13d provided on the respective leading edge portions of the support members 12a to 12d by pushing the conductor wire. Therefore, for example, in comparison with a conventional one configured to wind a helical coil by sequentially screwing a spiral element (helical coil) into the through hole formed in the edge portion of the rectangular rib from the end portion, The workability is remarkably excellent, and the number of winding steps can be significantly reduced. Also, during the winding work,
Since it suffices to simply insert the conductor wire into each groove of each groove group 13a to 13d, there is no fear that a large external force is applied to the conductor wire in an unreasonable manner. Therefore, it is not necessary to generate a partial bend or distortion in the formed helical coil. Therefore, the quality of the helical coil after completion can be improved, and a high quality helical antenna can be obtained.

FIG. 4 is a view showing the structure of the essential parts of the reel of the helical antenna for satellite communication according to the second embodiment of the present invention. As shown in FIG. 4, this winding frame is not a long single frame body, but a plurality of (two in this embodiment) divided frame bodies 70 (two in this embodiment) divided in the axial direction. 4 (a)
(Shown in (b)) and 80 (shown in (c) and (d) of FIG. 4). And these divided bodies 70, 8
0 means that the end faces of the adjacent rod-shaped bases 71 and 81 are
It is provided so as to be connectable to each other at a specific angular position in the axial direction. That is, a pair of convex portions 73, 74 are arranged opposite to each other on the end surface of the rod-shaped base body 71 of the one divided frame body 70, and a pair of concave portions 83, 84 are formed on the end surface of the rod-shaped base body 81 of the other divided frame body 80. Are opposed to each other. By inserting and operating the convex portions 73, 74 and the concave portions 83, 84, the two are engaged with each other, and the divided frame bodies 70, 80
It is possible to connect each other.

According to the second embodiment constructed as described above,
In addition to achieving the same effects as the first embodiment, the dividing frame 7
Since the length is reduced to 0.80, the reel can be easily formed. As a result, there is an advantage that a high quality reel without molding distortion can be easily obtained.

FIG. 5 is a diagram showing a main structure of a reel of a helical antenna for satellite communication according to a third embodiment of the present invention. As shown in FIG. 5, the winding frame 90 includes a cylindrical rod-shaped base 91 and rectangular plate-shaped first to fourth support members (only the first support member 92a is shown in the figure). It is formed in a body, and the first to fourth support members can be detachably attached to the outer periphery of the rod-shaped base 91. That is, the coupling through-hole groups 95a and 95b are provided on the outer periphery of the rod-shaped base 91, and the insertion projection group 94a is provided on the first support member 92a. Similarly, although not shown, the second to fourth support members are also provided with insertion protrusion groups. Thus, the first support member 92a
Is approached to the outer periphery of the rod-shaped base 91 as indicated by the arrow, and the tip of the insertion projection group 94a is applied to the coupling through hole group 95a and pushed in, the insertion projection group 94a elastically deforms. It is inserted into the combination through hole group 95a. When this insertion is completed, the insertion projection group 94a is restored by its own elasticity, so that the claws of the insertion projection group 94a are caught at the inner surface edge of the coupling through hole group 95a, and the first support member 92a is prevented from coming off. Is inserted in a locked state. Similarly, the second to fourth support members (not shown) are also attached.

According to the third embodiment thus constituted, the same operational effect as that of the first embodiment is obtained, and the structure of the "mold" for forming the reel is simplified, so that the manufacturing cost is reduced. It can be significantly reduced. Moreover, the supporting members 92a of different types (mainly the size of the pitch P of the groove group 93a) are different.
And the like can be appropriately selected and inserted into the rod-shaped substrate 91. The support member 92a and the like can be relatively easily detached from the rod-shaped base 91 by forcibly pulling out the insertion projection group 94a and the like from the coupling through hole group 95a and the like against the elastic locking force. The present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[0026]

According to the present invention, each of the groove groups for engaging the conducting wire is formed at each of the front edge portions of each of the supporting members of the reel regardless of the direction of the right axis or the direction of the left axis. , The adjacent support members are provided so as to be sequentially displaced by 1/2 pitch, and the conductor wire is wound around these groove groups in a spiral shape. With different winding direction, different pitch,
In addition, it is possible to wind a helical coil having a different form, there is almost no influence on the antenna characteristics due to the dielectric material forming the winding frame, and the workability of the winding is extremely good, and the number of winding steps is large. It is possible to provide a high-quality helical antenna for satellite communication, which can be manufactured at a low cost and does not require partial bending or distortion in the helical coil.

[Brief description of drawings]

FIG. 1 is a perspective view showing a schematic configuration of a helical antenna for satellite communication according to an embodiment of the present invention.

2A and 2B are a front view and an end view showing a main configuration of a winding frame and a right-handed helical coil of a satellite communication helical antenna according to the embodiment.

3A and 3B are a front view and an end view showing a main configuration of a reel and a left-handed helical coil of the satellite antenna for satellite communication according to the embodiment.

FIG. 4 is a diagram showing a main configuration of a reel of a helical antenna for satellite communication according to a second embodiment of the present invention.

FIG. 5 is a view showing a main configuration of a reel of a helical antenna for satellite communication according to a third embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Reel, 11 ... Rod-shaped base, 12a-12d ... Support member, 13a-13d ... Groove group for conductor insertion, 20 ... Helical coil, 21, 22 ... 1st, 2nd coil, 20A
... right-handed coil, 20B ... left-handed coil, 30 ... feeding part, 40 ... coaxial cable, 50 ... coaxial cable connector, 60 ... cover.

Claims (3)

[Claims] 1. A helical antenna for satellite communication in which a conductor is spirally wound around a winding frame, wherein a cylindrical or columnar rod-shaped base and two planes that include the central axis of the rod-shaped base and are orthogonal to each other. Of the first to fourth supporting members, which are rectangular plate-shaped and are radially provided at four positions on the outer peripheral surface of the rod-shaped base so that each of them exists, and among these first to fourth supporting members, First and second groove groups for engaging the conducting wires, which are formed at a predetermined pitch, at symmetrical positions of the respective tip edge portions of the first and second support members facing each other at angular positions different from each other by 180 °, The third and the third support members, which are opposite to each other at an angle position different from each other by 180 °, at a position offset by 90 ° from the first and second support members
A third wire-engaging wire insertion member formed at a symmetrical position of each tip edge portion of the fourth support member at a predetermined pitch and at a pitch displaced from the first and second groove groups by 1/2 pitch. , A helical antenna for satellite communication, characterized in that it has a fourth groove group and a winding frame composed of. 2. The satellite communication according to claim 1, wherein end faces of adjacent rod-shaped bases in the plurality of divided frame bodies are provided so as to be connectable to each other at a specific angular position in the axial direction. Helical antenna. 3. A cylindrical or columnar rod-shaped base body and rectangular plate-shaped first to fourth support members are separately formed,
The helical antenna for satellite communication according to claim 1, wherein the first to fourth support members are detachably provided on the outer periphery of the rod-shaped base.