JPH0817284B2 - Feed line connection part in antenna - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention aims to solve the following problems.

(Field of Industrial Application) The present invention relates to a feeder connecting portion in an antenna.

(Prior Art) A conventional feeder line connection part that enables connection of a balanced type feeder line (see, for example, Japanese Utility Model Publication No. 57-21364) has an impedance mismatch when a coaxial cable is connected. However, there is a problem in that signal transmission becomes poor due to the occurrence of noise.

(Problems to be Solved by the Invention) Except for the above-mentioned problems of the prior art, the present invention is not limited to the connection of balanced feed lines, but the feed line of an antenna that can perform coaxial cable connection with good impedance matching. It is intended to provide a connection.

 The configuration of the present invention is as follows.

(Means for Solving Problems) The invention of the present application employs means as described in the claims, and its operation is as follows.

(Function) The balanced type feeder line can be connected by fixing the balanced type feeder line to the substrate with the pressing piece and fastening the core wire of the feeding line to the terminal piece with the tightening piece. Further, the coaxial cable can be connected with good impedance matching by fixing the coaxial cable to the substrate with the pressing piece and by fastening the central conductor of the cable to the terminal piece with the fastening piece.

(Example) Hereinafter, drawings showing an example of the present application will be described. In FIGS. 1 and 6, reference numeral 1 denotes an antenna radiator, which has a radiator main body 2 and a feeder line mounting portion 3. In the radiator main body 2, 4 is a base, which is made of a synthetic resin material (for example, polypropylene resin). 5 and 5 are antenna elements, each made of aluminum material,
5a, 5a are attached to the base body 4 in an embedded manner. In the base body 4, reference numeral 6 is an arm mounting portion for mounting the radiator 1 on the arm, and a nut 6a is embedded as clearly shown in FIG.

Next, the power supply line mounting portion 3 is composed of the base body 4 of the main body 2 and a power supply line mounting body 8 which is a separate body from the base body 4.

In the base body 4, 10 is a main body portion, which has a T-shaped fitting hole 11 in the center portion and an annular insertion groove 12 in the peripheral edge. Reference numeral 13 is a receiving plate integrally formed with the main body portion 10, one surface of which is a receiving seat 14 for receiving a later-described overlapping portion of the power supply line mounting body 8, and a nut member having a female screw hole 16 in the middle portion.
15 are embedded (see Figure 4). Next, 17 is the main body
The terminal piece fixed to 10 is formed integrally with the antenna element 5 so as to be electrically connected to it.
As shown in FIGS. 2 and 4, the terminal piece 17 is provided so as to face the seat 14 with a space into which the overlapping portion can be inserted. Next, 18 shows a fastener. In the fastener 18, 19 is a fastening piece provided to the terminal pieces 17 and 17 so as to face each other, and is formed in a size that straddles both the terminal pieces 17 and 17 as shown in FIG. On the lower surface, a partition 20 is provided so as to intervene between the terminal pieces 17, 17. Reference numeral 21 is a screw rod for tightening, the tip of which is screwed into the female screw hole 16. The above fastening piece 19
Is preferably formed of a transparent and colorless polycarbonate resin so that the place where the core wire of the power supply line is pressed can be visually confirmed. Next, the feeder assembly 8
Is a board 22 for mounting the power supply line, a fixture 34 disposed on one surface side thereof, a balun 45 for impedance conversion provided on the other surface side and a cover 56 thereof as shown in FIGS. It consists of and. The substrate 22 includes a body portion 23, an overlapping portion 24, and a fitting portion 25.
And they are integrally formed of a synthetic resin material (for example, polypropylene resin). In the main body 23,
Reference numeral 26 is an attachment portion of the power supply line, which is formed in a concave groove shape, in which an outer conductor connecting piece 27 made of brass, for example, is provided at its end portions 27a, 27b.
Are attached by bending as shown in FIGS. Reference numeral 28 denotes a guide member, and 28a denotes a guide surface thereof, which is located on an extension line of the attachment portion 26. As clearly shown in FIG. 8, a transformer mounting portion 38 is provided on the back surface of the main body portion 23. In this, 39 is a frame for positioning that is integrally formed with the substrate 25, 40 and 40 are mounting holes for baluns, 41 and 41 are sandwiching pieces, and the intervals between the facing inner surfaces are protrusion pieces to be described later in the balun 45. It is slightly smaller than the distance between the outer surfaces of 55 and 55. Reference numeral 42 denotes a fixing hole of the cover.

Next, as shown in FIGS. 2 and 4, the overlapping portion 24 is formed to have a thickness dimension capable of intervening in the space between the seat 14 and the terminal piece 17 in the base 4. The partition body 20 is provided in the middle of the overlapping portion 24.
Further, a through hole 30 for inserting the screw rod 21 is provided. Further, side plates 31, 31 are integrally provided at both end portions. Reference numerals 32 and 32 are contact pieces (for example, made of brass) attached to the overlapping portion 24, which are provided at positions where they overlap with the terminal piece 17, respectively, as shown in FIG. It is fixed to the overlapping portion 24 by bending as shown in the drawing. Next is the superposition section
The fitting piece 25 integrally formed at the front end of 24 has a cross-sectional shape corresponding to the fitting hole 11 of the main body 10. Next, the feeder fixing device 34 comprises a pressing piece 35 provided to face the attachment portion 26 so as to press the feeder, and a screw rod 36 for fastening the pressing piece 35 to the board 22.

Then, in the balun 45 mainly shown in FIG.
Is a plate made of synthetic resin such as polypropylene, 51 is a conducting wire that constitutes a half-wavelength bypass line, 52 is a conducting wire that constitutes an earth conductor, and these conducting wires are wound around the plate 50 to reduce the occupied area. There is. As shown in FIG. 14, the conductive wires 51, 52 are two parallel polyurethane-coated copper wires (both are integrally connected by a coating), one 52 being half the length of the other 51 (for example, 9 cm). It is formed by cutting and bending the other side as shown by the arrow. The core wire of the conductor has a thickness of 0.29 mm, and the outer diameter of the coating is 0.8 mm. Both ends of the lead wire 51, that is, the balanced terminals 51a, 51a are connected to the ends 32a, 32a of the contact piece 32, and one end of the lead wire 52, that is, the ground terminal 52a.
Are connected to the end portions 27a of the outer conductor connecting pieces 27 by soldering means, respectively. The thickness of the balun 45 including the plate body 50 and the conductive wire wound around the balun 45 is formed to be thin, for example, 3.5 mm so that the balun 45 can be completely fitted in an empty space (also called a dead space) on the back side of the substrate 22. is there. 54 is a plate 50
The fitting portion provided in the above is adapted to fit with the frame body 39. Reference numeral 55 denotes a mounting projection integrally formed with the plate body 50, which is formed to be slightly thicker than the thickness of the mounting hole 40 so as to be tightly fitted into the mounting hole 40.

Next, the cover 56 is integrally formed with the main body portion 23 of the substrate through a thin-walled hinge 57 as shown in FIG. A protrusion 58 is provided on the inner surface side of the cover 56.
The thickness of the protruding piece 58 is formed to be slightly larger than the diameter of the fastening hole 42 provided at the corresponding position in the main body portion 23 of the substrate, and is fitted tightly thereto.

In the above structure, the balun 45 is attached to the board 22 by the antenna maker as follows. First, from the state shown in FIG. 8, the fitting portion 54 of the balun 45 is fitted into the frame body 39, and the projecting piece 55 is press-fitted into the mounting hole 40.
Mechanically fix the balun 45 to 23. Then lead wires 51,5
The two ends 51a, 52a are connected as described above. Then hinge
By bending 57, the cover 56 is covered on the balun 45 as shown in FIG. 7, and the protrusion 58 is press-fitted into the fixing hole 42. This completes the assembly. In the assembled state, the protruding piece 55 has its outer side sandwiched as shown in FIG.
The sandwiching piece 41 is pressed by 41 and is prevented from escaping to the outside by a projecting piece 58 located outside thereof. That is, the code
The portions indicated by A and B are in the pressed state. Therefore, even if the mounting hole 40 has a shallow depth and only the tip portion of the projecting piece 55 is fitted therein, the mounting state of the balun 45 on the substrate 22 is firm.

In addition, in the antenna manufacturer, mainly
As shown in the figure, the fitting portion 25 of the feeder assembly 8 is the main body portion.
10 into the fitting hole 11 and the overlapping portion 24 is formed with the seat 14 and the terminal piece.
The feed line mounting body 8 is assembled to the base body 4 while intervening between them, and then the partition body 20 of the fastening piece 19 is positioned in the through hole 30 in the fastener 18, and the screw rod 21 is internally threaded. Screw it into the hole 16. As a result, the attachment body 8 is in a state in which its detachment from the base body 4 is prevented. Next, the waterproof cap 60 is put on the mounting body 8 and the tip end thereof is inserted into the insertion groove 12. Thereby, the radiator 1 is completed. The radiator 1 in this state is shipped from the manufacturer together with other antenna members (boom, director, reflector, etc.).

Next, for use by the consumer, the balanced type feeder line 61 as shown in FIGS. 1 to 5 is connected as follows. First, as shown in FIG. 9, the tip of the balanced type feed line 61 is peeled off to expose the core wire 61a. Next, with the waterproof cap 60 removed, the power supply line is inserted from the state shown in FIG. 9 under the holding piece 35, and the core wire 61a is inserted between the terminal piece 17 and the tightening piece 19. To do. Next, by tightening the screw rod 21, the core wire 61a is tightened to the terminal piece 17 by the tightening piece 19. In this state, as is apparent from FIG. 4, the overlapping portion 24 is also tightened between the tightening piece 19 and the seat 14 via the core wire 61a and the terminal piece 17. Therefore, the attachment body 8 is in a state of being firmly connected to the base body 4. Next, as shown in FIG. 5, by tightening the screw rod 36, the feeding wire 61 is fixed to the attachment portion 26 by the pressing piece 35. Then, the waterproof cap 60 is put on the predetermined position to complete the connection work of the power supply line 61.

On the other hand, when it is desired to connect the coaxial cable 63 as shown in FIGS. 10 and 11, the procedure is as follows. First coaxial cable
Strip the tip of 63. Next, the coaxial cable 63 is inserted under the holding piece 35 as in the case of the balanced type feed line 61. In this case, the central conductor 64 is guided by the guide surface 28a and moves onto the one terminal piece 17, and the outer conductor 65
The insertion is performed under the holding piece 35 to a position where the person rides on the outer conductor connecting piece 27. Then, by tightening the screw rod 21 of the fastener 18 in that state, the center conductor 64 is tightened between the tightening piece 19 and the terminal piece 17 in the same manner as in the case of the balanced type feeder line. When the screw rod 21 is tightened in this manner, each terminal piece 17 and each contact piece 32 are pressed against each other as in the case of FIG. 4, and the balun 45 is connected to the terminal piece 17. Further, by tightening the screw rod 36 of the fixture 34, the outer conductor 65 of the coaxial cable is tightened by the pressing piece 35 with respect to the connecting piece 27 of the attachment portion 26. Next, the waterproof cap 60 is put up to a predetermined position to complete the connection of the coaxial cable 63. As a result, the connection state as shown in the circuit of FIG. 13 is achieved. The center conductor 64 of the coaxial cable has no electrical difference when connected to any of the terminal pieces 17,
Due to the presence of the guide surface 28a, it is possible to prevent a general user from confusing which side the connection should be made. In the state where the coaxial cable 63 is connected as described above, the signals received by the both antenna elements 5, 5 are the two terminal pieces 17,
It is transmitted from 17 through the balun 45 to the coaxial cable 63 with good impedance matching.

(Effects of the Invention) As described above, according to the present invention, the balanced feed line 61 is fixed to the substrate 23 by the pressing piece 35, and the core wire 61a of the feed line is fastened to the terminal piece 17 by the fastening piece 19. It is of course possible to connect the balanced type feed line by using the pressing piece 35 to fix the coaxial cable 63 to the board 23 and the tightening piece 19 to connect the center conductor 64 of the cable to the terminal piece.
It has a feature that the coaxial cable can be connected with good impedance matching by tightening it to 17.

[Brief description of drawings]

The drawings show the embodiments of the present application. FIG. 1 is a partially cutaway front view of an antenna radiator, FIG. 2 is a sectional view taken along line II-II, FIG. 3 is a sectional view taken along line III-III, and FIG. The figure is a cross-sectional view taken along the line IV-IV, FIG. 5 is a cross-sectional view taken along the line VV, FIG. 6 is an exploded perspective view, FIG. 7 is a rear perspective view of the feeder assembly, and FIG. FIG. 9 is an exploded perspective view showing the back side, FIG. 9 is a perspective view showing a state before connecting a balanced type power supply wire, FIG. 10 is a partially cutaway front view showing a state in which a coaxial cable is connected, and FIG. 11 is XI. Fig. 12 is a sectional view taken along line -XI, Fig. 12 is a sectional view taken along line XII-XII, Fig. 13 is a circuit diagram with a coaxial cable connected, and Fig. 14 is a diagram showing a method of forming a conductor wire in a balun. 4 ... Base, 8 ... Feeder mount, 14 ... Seat, 17 ...
Terminal strips, 19 ... Tightening strips, 22 ... Board, 24 ... Overlap, 32
…… Contact piece, 35 …… Presser piece, 45 …… Balan.

Claims (1)

[Claims] 1. A base having two bases of the two antenna elements fixed to each other, and a substrate for mounting a power supply line, which is separate from the base, and a part of the base being part of the base. Is provided with a seat for receiving, and the base is provided with two terminal pieces electrically connected to the respective antenna elements individually, for inserting a part of the base into the seat. A space is provided so as to be opposed to each other, a part of the substrate is left in the space, and the terminals are provided on the side opposite to the seat with respect to the terminal piece. A fastening piece sized to straddle the pieces is arranged, and the fastening piece can be moved toward and away from the seat by a screw rod having a through hole provided in a part of the substrate. While the substrate is
In a feeding line mounting portion of an antenna in which a holding piece for fixing a feeding line to the board is distantly connected to the board, an external portion is provided at a position facing the holding piece in the feeding line mounting board. A conductor connecting piece is provided, and a contact piece is provided at a position facing each of the two terminal pieces, and the board is provided with a balun.
A feed line mounting portion in an antenna, wherein the outer conductor connecting piece is connected to a ground terminal of the balun, and the contact pieces are connected to balanced terminals of the balun.