CN221407625U - Bending antenna - Google Patents

Abstract

The utility model discloses a bending type antenna, and belongs to the technical field of antennas. The meander antenna includes: a mounting column; the two first main supporting rods are arranged on the mounting column in parallel at intervals, each first main supporting rod comprises at least two first sections, and a first rotating module is arranged at the steering joint of each two adjacent first sections; the second main supporting rod is arranged on the mounting column and located between the two first main supporting rods, the second main supporting rod comprises at least two second sections, and second rotating modules are arranged at steering joints of two adjacent second sections. The utility model can bend according to the size of the installation space under the condition of ensuring that the electrical performance of the antenna is not affected, thereby facilitating the bending of the antenna body part and expanding the applicable scene of the antenna.

Description

Bending antenna

Technical Field

The utility model relates to the technical field of antennas, in particular to a bending antenna.

Background

Antennas are generally reversible in that they convert guided waves propagating on a transmission line into propagating electromagnetic waves, or vice versa. The components used for transmitting or receiving electromagnetic waves in radio equipment, such as engineering systems of radio communication, broadcasting, television, radar, navigation, electronic countermeasure, remote sensing, radio astronomy and the like, are operated by virtue of antennas whenever the electromagnetic waves are utilized for transmitting information.

The existing ultrashort wave antenna has various forms and is manufactured by processes such as sheet metal stamping or metal die casting integrated forming. In some application scenarios, the antenna body portion cannot be physically bent due to limited installation space, so that the antenna body portion needs to be redesigned in size, and the applicable scenarios of the antenna are reduced.

For this reason, it is needed to provide a meander antenna to solve the above problems.

Disclosure of utility model

The utility model aims to provide a bending type antenna which can be bent according to the size of an installation space under the condition that the electrical performance of the antenna is not affected, so that the bending of the antenna body part is convenient, and the applicable scene of the antenna is enlarged.

In order to achieve the above object, the following technical scheme is provided:

A meander antenna comprising:

a mounting column;

The two first main supporting rods are arranged on the mounting column in parallel at intervals, each first main supporting rod comprises at least two first sections, and a first rotating module is arranged at the steering joint of each two adjacent first sections;

The second main supporting rod is arranged on the mounting column and located between the two first main supporting rods, the second main supporting rod comprises at least two second sections, and second rotating modules are arranged at steering joints of two adjacent second sections.

As an alternative scheme of the bent antenna, the first rotating module comprises a central shaft, and a first swing rod and a second swing rod which are simultaneously connected with the central shaft in a rotating mode, one of two adjacent first sections is connected with the first swing rod, and the other of the two adjacent first sections is connected with the second swing rod.

As the alternative scheme of buckling type antenna, first rotary module still includes first guide frame, second guide frame and switch mechanism, the both ends of center pin are inserted respectively and are located in the centre bore of first guide frame, first guide frame simultaneously with first pendulum rod and one of them first segmentation is connected, the second guide frame with the second pendulum rod is connected, first guide frame with the second guide frame passes through switch mechanism locking or unblock.

As the alternative scheme of buckling type antenna, switch mechanism includes gag lever post, compression spring and nut, use on the first guide frame the centre bore is equipped with first arc guide way as centre of a circle circumference, the second guide frame is equipped with the through-hole, the afterbody of gag lever post passes in proper order first arc guide way with the through-hole and with the nut is connected, compression spring cover is located on the gag lever post, just compression spring's both ends clamp is located between the head of gag lever post and the outer wall of first guide frame.

As the alternative scheme of buckling type antenna, be provided with annular bellying on the gag lever post, the both ends of first arc guide way are equipped with the hysteresis hole, annular bellying's diameter is greater than the width of first arc guide way and is less than the internal diameter of hysteresis hole.

As the alternative scheme of buckling type antenna, first rotary module still includes first locating pin, be equipped with first locating hole on the first guide frame, be equipped with the second locating hole on the second pendulum rod, first locating pin wears to locate first locating hole with in the second locating hole makes two first segmentation is in sharp state.

As an alternative scheme of the bending antenna, the second rotating module comprises a first sleeve component, a second sleeve component and a third guide frame, wherein a first rotating shaft hole and a second rotating shaft hole are formed in the third guide frame, the first sleeve component is rotationally connected with the first rotating shaft hole, the second sleeve component is rotationally connected with the second rotating shaft hole, one of two adjacent second sections is connected with the first sleeve component, and the other of the two adjacent second sections is connected with the second sleeve component.

As the alternative scheme of buckling type antenna, the second rotary module still includes second locating pin and third locating pin, use on the third guide frame first pivot hole is equipped with the second arc guide way as centre of a circle circumference, use on the third guide frame the second pivot hole is equipped with the third arc guide way as centre of a circle circumference, the second locating pin wears to locate the second arc guide way and with one of them second segmentation connection, the third locating pin wears to locate the third arc guide way and with another of them second segmentation connection.

As an alternative to the meander antenna, a collective line feed switch tab is provided in the second main support bar, the collective line feed switch tab being joined at the steering joint by a flexible connection.

As an alternative to the meander antenna, the outer side walls of the two primary support struts are provided with a plurality of take-up wheels at intervals.

Compared with the prior art, the utility model has the beneficial effects that:

The bending antenna provided by the utility model is characterized in that two first main supporting rods and one second main supporting rod are assembled on a mounting column, and the three main supporting rods are arranged in parallel and at intervals. The first main supporting rods and the second main supporting rods are designed in a segmented mode, a first rotating module is arranged at the steering joint of each first main supporting rod, a second rotating module is arranged at the steering joint of each second main supporting rod, and the two first main supporting rods and one second main supporting rod are bent at the same time by additionally arranging the first rotating module and the second rotating module, so that the antenna can be bent according to the size of an installation space under the condition that the electrical performance of the antenna is not affected, and the antenna body is convenient to bend, and the applicable scene of the antenna is enlarged.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following description will briefly explain the drawings needed in the description of the embodiments of the present utility model, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the contents of the embodiments of the present utility model and these drawings without inventive effort for those skilled in the art.

Fig. 1 is an assembly schematic diagram of a meander antenna according to an embodiment of the present utility model;

fig. 2 is a top view of a bent antenna in a bent state according to an embodiment of the present utility model;

Fig. 3 is a side view of a bent antenna according to an embodiment of the present utility model;

Fig. 4 is a top view of a bent antenna in a straight line state according to an embodiment of the present utility model;

Fig. 5 is a side view of a bent antenna in a straight line according to an embodiment of the present utility model;

FIG. 6 is a schematic view of an assembly of a first primary support bar according to an embodiment of the present utility model;

FIG. 7 is an exploded view of a primary support rod according to an embodiment of the present utility model;

FIG. 8 is an exploded view of a switch mechanism according to an embodiment of the present utility model;

FIG. 9 is a schematic view illustrating the assembly of a second primary support bar in accordance with an embodiment of the present utility model;

FIG. 10 is a first exploded view of a second primary support rod according to an embodiment of the present utility model;

FIG. 11 is a second exploded view of the secondary support bar according to an embodiment of the present utility model.

Reference numerals:

1. A first main support bar; 2. a second main support bar; 3. a mounting column;

11. A first segment; 12. a first rotation module; 121. a first swing rod; 122. the second swing rod; 1221. a second positioning hole; 123. a first guide frame; 1231. a central bore; 1232. a first arcuate guide slot; 1233. a retention hole; 1234. a first positioning hole; 124. a second guide frame; 1241. a through hole; 125. a limit rod; 1251. an annular protruding portion; 126. a compression spring; 127. a nut; 128. a central shaft; 13. a wire winding wheel; 14. a first positioning pin;

21. A second segment; 22. a second rotation module; 221. a first sleeve assembly; 222. a second sleeve assembly; 223. a third guide frame; 2231. a first rotation shaft hole; 2232. a second rotation shaft hole; 2233. a second arcuate guide slot; 2234. a third arcuate guide slot; 23. a collection line feed switching piece; 24. a flexible connection.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present utility model and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed", "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected or integrally connected; either mechanically or electrically. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

For a broadband ultrashort wave antenna, the frequency band is far larger than the frequency multiplication bandwidth, the traditional single dipole antenna or monopole antenna cannot achieve the bandwidth exceeding the frequency multiplication, so that a logarithmic periodic type dipole is selected, and because a plurality of dipoles are arranged in an array mode, an infinite broadband can be achieved in an infinite size theoretically, the broadband ultrashort wave antenna belongs to a type of a non-frequency-variable antenna, has broadband impedance and radiation characteristics, is widely applied to wireless transmission, can achieve a plurality of frequency multiplication theoretically, and can maintain good impedance characteristics and pattern characteristics in a plurality of frequency multiplication strokes.

The log periodic form dipole antenna is a basic form of the log periodic antenna, and is formed by cross-connecting a plurality of parallel dipoles by using double wires, wherein the wires are called a collecting wire, one end of the collecting wire is fed, the other end of the collecting wire is opened or shorted, so that the parallel dipoles with different lengths and different intervals connected to the collecting wire are excited simultaneously by the open or short circuit secondary surfaces, thereby realizing a wide frequency band.

In order to ensure that the electrical performance of the antenna is not affected, the antenna body can be bent according to the size of the installation space, so that the antenna body can be bent conveniently, and the applicable scene of the antenna can be enlarged, the embodiment provides a bent antenna, and the specific content of the embodiment is described in detail below with reference to fig. 1 to 11.

As shown in fig. 1 to 5, the meandered antenna comprises a mounting post 3, two first main support rods 1 and a second main support rod 2. Wherein, two first main supporting rods 1 are parallel and are arranged on the mounting column 3 at intervals, the first main supporting rods 1 comprise at least two first sections 11, and a first rotating module 12 is arranged at the steering joint of the adjacent two first sections 11. The second main supporting rod 2 is arranged on the mounting column 3 and is positioned between the two first main supporting rods 1, the second main supporting rod 2 comprises at least two second sections 21, and a second rotating module 22 is arranged at the steering joint of the two adjacent second sections 21.

Illustratively, the upper, middle and lower three main struts of the meander antenna are secured to the mounting posts 3 by screws through metallic or non-metallic support plates.

Briefly, the present utility model provides a meander antenna, wherein two first main struts 1 and one second main strut 2 are assembled to a mounting post 3, the three main struts being arranged in parallel and spaced apart relation. The first main supporting rods 1 and the second main supporting rods 2 are designed in a segmented mode, a first rotating module 12 is arranged at the steering joint of each first main supporting rod 1, a second rotating module 22 is arranged at the steering joint of each second main supporting rod 2, and the first rotating module 12 and the second rotating module 22 are additionally arranged, so that the two first main supporting rods 1 and one second main supporting rod 2 are bent at the same time, and under the condition that the electrical performance of the antenna is not affected, the bending can be carried out according to the size of an installation space, and further bending of an antenna body part is facilitated, and the applicable scene of the antenna is enlarged.

Further, as shown in fig. 6 to 8, the first rotary module 12 includes a central shaft 128 and first and second swing links 121 and 122 rotatably connected to the central shaft 128 at the same time, one of the adjacent two first segments 11 is connected to the first swing link 121, and the other of the adjacent two first segments 11 is connected to the second swing link 122. Specifically, the first swing rod 121 is fixedly inserted into the first segment 11 of one of the two swing rods, the second swing rod 122 is fixedly inserted into the second segment 21 of the other one of the two swing rods, the first swing rod 121 and the second swing rod 122 are hinged through the central shaft 128, and therefore the first segment 11 and the second segment 21 can be bent relatively, and further a narrow installation space is adapted.

Further, the first rotary module 12 further includes a first guide frame 123, a second guide frame 124 and a switch mechanism, two ends of the central shaft 128 are respectively inserted into a central hole 1231 of the first guide frame 123, the first guide frame 123 is connected with the first swing rod 121 and the first segment 11 of one of the first swing rods 121, the second guide frame 124 is connected with the second swing rod 122, and the first guide frame 123 and the second guide frame 124 are locked or unlocked by the switch mechanism. Specifically, the second guide frame 124 is fixedly connected with the second swing rod 122 by using a fastener such as a screw, and the second guide frame 124 is installed in the first guide frame 123, and when the first segment 11 is bent to a proper angle, the first main support rod 1 is positioned by using a switch mechanism, so that the first main support rod 1 is in a straight line state or a bent state.

Further, as shown in fig. 6 in combination with fig. 8, the switch mechanism includes a stop lever 125, a compression spring 126 and a nut 127, a first arc guide groove 1232 is circumferentially arranged on the first guide frame 123 by taking the central hole 1231 as the center of a circle, a through hole 1241 is arranged on the second guide frame 124, the tail portion of the stop lever 125 sequentially penetrates through the first arc guide groove 1232 and the through hole 1241 and is connected with the nut 127, the compression spring 126 is sleeved on the stop lever 125, and two ends of the compression spring 126 are clamped between the head portion of the stop lever 125 and the outer wall surface of the first guide frame 123. When the first segment 11 of the first main support bar 1 is bent, the stopper rod 125 can slide along the first arc-shaped guide groove 1232, ensuring the accuracy of the rotation of the first segment 11.

The central angle corresponding to the first arc-shaped guide groove 1232 may be designed according to the actual use situation. Preferably, the central angle corresponding to the first arc-shaped guide groove 1232 is 90 ° in the present embodiment, so that the first segment 11 can be bent by 90 °.

Optionally, the stop lever 125 is provided with an annular protruding portion 1251, two ends of the first arc-shaped guiding groove 1232 are provided with retention holes 1233, and the diameter of the annular protruding portion 1251 is larger than the width of the first arc-shaped guiding groove 1232 and smaller than the inner diameter of the retention holes 1233. When it is not necessary to bend the first segment 11, the stopper rod 125 is lifted up by the spring so that the annular boss 1251 of the stopper rod 125 is positioned in the retention hole 1233. When the first segment 11 needs to be bent, the annular protrusion 1251 is separated from the retaining hole 1233 by pressing the limiting rod 125, so that the slender part of the limiting rod 125 slides along the first arc-shaped guiding groove 1232.

Preferably, graduation marks are provided on the first guide frame 123 at the notch of the first arc-shaped guide groove 1232 for indicating the angle at which the first segment 11 is bent.

Further, the first rotary module 12 further includes a first positioning pin 14, a first positioning hole 1234 is formed on the first guide frame 123, a second positioning hole 1221 is formed on the second swing rod 122, and the first positioning pin 14 is disposed in the first positioning hole 1234 and the second positioning hole 1221 in a penetrating manner so that the two first segments 11 are in a straight line state. By inserting the first positioning pin 14 into the first and second positioning holes 1234 and 1221, the displacement of the two first segments 11 is facilitated to be restricted.

As shown in fig. 9 to 11, further, the second rotating module 22 includes a first sleeve assembly 221, a second sleeve assembly 222 and a third guide frame 223, a first rotating shaft hole 2231 and a second rotating shaft hole 2232 are provided on the third guide frame 223, the first sleeve assembly 221 is rotatably connected with the first rotating shaft hole 2231, the second sleeve assembly 222 is rotatably connected with the second rotating shaft hole 2232, one of two adjacent second segments 21 is connected with the first sleeve assembly 221, and the other of two adjacent second segments 21 is connected with the second sleeve assembly 222. One of the second segments 21 is rotated around the first rotation shaft hole 2231 on the third guide frame 223, and the other second segment 21 is rotated around the second rotation shaft hole 2232 on the third guide frame 223, so that the function of bending the second segment 21 according to the actual installation space is realized.

Further, the second rotating module 22 further includes a second positioning pin and a third positioning pin, the third guiding frame 223 is circumferentially provided with a second arc guiding slot 2233 by taking the first rotating shaft hole 2231 as a center, the third guiding frame 223 is circumferentially provided with a third arc guiding slot 2234 by taking the second rotating shaft hole 2232 as a center, the second positioning pin is arranged in the second arc guiding slot 2233 in a penetrating manner and is connected with the second segment 21 of one of the second arc guiding slots 2233, and the third positioning pin is arranged in the third arc guiding slot 2234 in a penetrating manner and is connected with the second segment 21 of the other of the second arc guiding slots. When one of the second segments 21 is bent to a proper angle, the second positioning pin is screwed to lock the position of the second segment 21 on the third guide frame 223. When the other second segment 21 is bent to a proper angle, the third positioning pin is screwed to lock the position of the second segment 21 on the third guide frame 223.

Preferably, graduation marks are designed at the notch of the second arc-shaped guide groove 2233 and the notch of the third arc-shaped guide groove 2234 for indicating the bending angle of the second segment 21.

As shown in fig. 10, in this embodiment, the central angle corresponding to the second arc-shaped guiding groove 2233 is 45 °, the central angle corresponding to the third arc-shaped guiding groove 2234 is 45 °, and avoidance notches are disposed on both the first sleeve component 221 and the second sleeve component 222, so that the two second segments 21 achieve a function of bending by 90 °.

Further, a collective line feed switching piece 23 is provided in the second main support bar 2, and the collective line feed switching piece 23 is connected at the steering joint by a flexible connection piece 24. By adopting the flexible connection piece 24 to connect the collecting line feed switching piece 23 at the joint, even if the second main supporting rod 2 bends, the normal operation of the collecting line feed switching piece 23 can be ensured without affecting the electrical performance of the antenna. It can be understood that the main supporting rod in the middle is an antenna feeding part device, the feeding part also realizes the 90-degree bending function through reasonable design, and the balun of the feeding part changes hard connection into soft connection, so that the feeding part can have reasonable telescopic function when bending is realized.

Further, the outer side walls of the two primary support rods 1 are provided with a plurality of take-up wheels 13 at intervals. In order to achieve the effect of enabling the antenna to be freely telescopic, the take-up wheel 13 is divided into a take-up wheel cavity, a take-up wheel cavity supporting piece, a spring, a positioning shaft, a movable bearing, a positioning shaft sleeve, a guide rail wheel and the like, and specific requirements of each object are designed according to the length of a vibrator wire and the tensile strength.

In summary, the bent antenna in this embodiment includes an upper main supporting rod, a lower main supporting rod, a row of winding wheels 13 horizontally disposed on the upper main supporting rod, a middle supporting rod for encapsulating the integrated wire, and soft oscillator wires and power feeding switching pieces 23 for the integrated wire respectively mounted at the left and right ends of the integrated wire, so as to more reliably protect the integrated wire under the condition of conducting electrical performance, and a row of winding wheels 13 horizontally disposed on the lower main supporting rod.

Compared with the prior art, the bending antenna of the embodiment has the advantages that under the condition of specific size, through reasonably designing the vibrator form and the wire collecting mode of the wire collecting wheel 13, the wire collecting is hidden, and the upper, middle and lower main supporting rods can achieve the electrical performance and the reliability and the mechanical performance.

Note that the above is only a preferred embodiment of the present utility model and the technical principle applied. It will be understood by those skilled in the art that the present utility model is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the utility model. Therefore, while the utility model has been described in connection with the above embodiments, the utility model is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the utility model, which is set forth in the following claims.

Claims (10)

1. A meander antenna, comprising:

A mounting post (3);

The two first main supporting rods (1) are arranged on the mounting column (3) in parallel and at intervals, each first main supporting rod (1) comprises at least two first sections (11), and a first rotating module (12) is arranged at the steering joint of each two adjacent first sections (11);

The second main supporting rods (2) are arranged on the mounting columns (3) and located between the two first main supporting rods (1), each second main supporting rod (2) comprises at least two second sections (21), and second rotating modules (22) are arranged at steering joints of every two adjacent second sections (21).

2. The meander antenna of claim 1, wherein the first rotary module (12) comprises a central shaft (128) and first (121) and second (122) swing arms simultaneously in rotational connection with the central shaft (128), one of the adjacent two first segments (11) being connected to the first swing arm (121) and the other of the adjacent two first segments (11) being connected to the second swing arm (122).

3. The bent antenna according to claim 2, wherein the first rotating module (12) further comprises a first guide frame (123), a second guide frame (124) and a switching mechanism, two ends of the central shaft (128) are respectively inserted into a central hole (1231) of the first guide frame (123), the first guide frame (123) is simultaneously connected with the first swing rod (121) and the first segment (11) of one of the first swing rods, the second guide frame (124) is connected with the second swing rod (122), and the first guide frame (123) and the second guide frame (124) are locked or unlocked through the switching mechanism.

4. The bent antenna according to claim 3, wherein the switch mechanism comprises a limit rod (125), a compression spring (126) and a nut (127), a first arc-shaped guide groove (1232) is circumferentially arranged on the first guide frame (123) by taking the central hole (1231) as a circle center, a through hole (1241) is formed in the second guide frame (124), the tail of the limit rod (125) sequentially penetrates through the first arc-shaped guide groove (1232) and the through hole (1241) and is connected with the nut (127), the compression spring (126) is sleeved on the limit rod (125), and two ends of the compression spring (126) are clamped between the head of the limit rod (125) and the outer wall surface of the first guide frame (123).

5. The bent antenna according to claim 4, wherein the limit rod (125) is provided with an annular protruding portion (1251), two ends of the first arc-shaped guide groove (1232) are provided with retaining holes (1233), and the diameter of the annular protruding portion (1251) is larger than the width of the first arc-shaped guide groove (1232) and smaller than the inner diameter of the retaining holes (1233).

6. A bent antenna according to claim 3, wherein the first rotary module (12) further comprises a first positioning pin (14), a first positioning hole (1234) is formed in the first guide frame (123), a second positioning hole (1221) is formed in the second swing rod (122), and the first positioning pin (14) is inserted into the first positioning hole (1234) and the second positioning hole (1221) so that the two first segments (11) are in a straight state.

7. The bent antenna according to claim 1, wherein the second rotating module (22) comprises a first sleeve assembly (221), a second sleeve assembly (222) and a third guide frame (223), a first rotating shaft hole (2231) and a second rotating shaft hole (2232) are formed in the third guide frame (223), the first sleeve assembly (221) is rotationally connected with the first rotating shaft hole (2231), the second sleeve assembly (222) is rotationally connected with the second rotating shaft hole (2232), one of two adjacent second segments (21) is connected with the first sleeve assembly (221), and the other of the two adjacent second segments (21) is connected with the second sleeve assembly (222).

8. The bent antenna according to claim 7, wherein the second rotating module (22) further includes a second positioning pin and a third positioning pin, a second arc-shaped guide groove (2233) is circumferentially arranged on the third guide frame (223) around the first rotating shaft hole (2231) as a center, a third arc-shaped guide groove (2234) is circumferentially arranged on the third guide frame (223) around the second rotating shaft hole (2232), and the second positioning pin is inserted into the second arc-shaped guide groove (2233) and connected with the second segment (21) of one of the second arc-shaped guide grooves, and the third positioning pin is inserted into the third arc-shaped guide groove (2234) and connected with the second segment (21) of the other of the second arc-shaped guide grooves.

9. The meander antenna of any one of claims 1 to 8, wherein a collective line feed switch piece (23) is provided within the second main support bar (2), the collective line feed switch piece (23) being joined at a steering joint by a flexible connection (24).

10. The meander antenna according to claim 9, characterized in that the outer side walls of two of the primary support struts (1) are provided with a plurality of take-up wheels (13) at intervals.