JP3093531U - Multi-turn loop antenna - Google Patents

Abstract

(57) [Problem] To provide a multi-turn loop antenna that can be used not only for reception but also for transmission despite its small size. SOLUTION: A multi-turn loop antenna formed by winding a wire a plurality of times has a substantial wire diameter of 3.2 to 15 mm, and a circumference of each wire-turn is 0.03 of a working frequency.
~ 1.2 wavelength equal, the distance between each loop is 5 ~
It is configured by setting to 50 millimeters and setting the number of turns to 2 to 8 times. In the feeding part of this loop antenna,
By connecting and matching an antenna tuner, transmission and reception can be performed in at least each frequency band for amateur radio.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

  The present invention is a multi-turn loop antenna (frame type antenna) mainly used for amateur radio. Tena)

[0002]

[Prior art]

  As a multi-turn loop antenna known so far, about 1 mm in diameter Degree wire with a diameter of 1 meter several times and a matching device at both ends of this loop antenna Some are configured to connect a transceiver via.

[0003]

[Problems to be solved by the device]

  However, according to an experiment conducted by the inventor using the above loop antenna, Although the matching between the transmitter and the receiver was achieved by the function of the matching device, If it is only for reception in the frequency band that can be used for mature radio, It could hardly be used for both reception. The invention is going to solve The problem is that, despite its small size, it can be used not only for reception but also for transmission. Is to provide a loop antenna.

[0004]

[Means for Solving the Problems]

  The inventor who has conducted repeated experiments to solve the above-mentioned problems has found that the wire diameter of the wire rod, the loop- By limiting the winding length (peripheral length) and the distance between wire rods within a certain range, We have found that the loop antenna can be used for transmission and reception. Its detailed structure Will be explained in the next section.

The structure of the invention described in claim 1, that is, the multi-turn loop antenna according to the invention described in claim 1 (hereinafter, referred to as "loop antenna of claim 1") has a plurality of wire rods in a rectangular shape (square shape). It is an antenna that is wound. The wire rod has a substantial wire diameter of 3.2 to 15.0 mm, the wire rod-perimeter is formed to be equal to 0.03 to 1.2 wavelengths of the operating frequency, and between the loops. Is set to 5 to 50 millimeters, and the number of turns is 2 to 8 times. The loop surface is generally vertical, but may be horizontal or inclined. It is preferable to provide an automatic matching device (auto antenna tuner) capable of automatically performing impedance matching for each operating frequency between the feeding point of the loop antenna and the transceiver.

Operation and effect of the invention described in claim 1 By using the loop antenna of claim 1, transmission / reception in a used frequency band becomes possible. If the automatic matching device is provided, the impedance can be automatically matched in a wide frequency band and in a plurality of frequency bands, so that the loop antenna can be used efficiently and conveniently.

Structure of the Invention Described in Claim 2 The multi-turn loop antenna according to the invention described in claim 2 (hereinafter referred to as "loop antenna of claim 2") is limited to the structure of the loop antenna of claim 1. And the loop is formed in a substantially square shape.

Operation and effect of the invention described in claim 2 When the loop antenna of claim 2 is used, it is possible to obtain basically the same effect as that of the loop antenna of claim 1. In addition to this, by forming it into a substantially square shape, it is possible to increase the mechanical strength as compared with the case of forming it into a circular shape, for example.

Structure of the invention described in claim 3 The multi-turn loop antenna according to the invention described in claim 3 (hereinafter referred to as "loop antenna of claim 3") is the structure of the loop antenna of claim 1 or 2. The feature is that the loop surface can be installed vertically.

[0010] Loop antennas operational effects claim 3 of the invention described in claim 3 has been confirmed to have a directivity. Thereby, in addition to the effect of the loop antenna according to the first or second aspect, it is possible to perform transmission / reception according to the directional characteristic.

[0011]

[Embodiment of device]

  Next, referring to the drawings, an embodiment of the present invention (hereinafter referred to as “the present embodiment”) will be described. U) will be explained. FIG. 1 is a perspective view of a loop antenna. 2 is shown in FIG. FIG.

Schematic Configuration of Loop Antenna A schematic configuration of the loop antenna 1 will be described with reference to FIGS. 1 and 2. The loop antenna 1 is roughly composed of an element part 3 and a support part 5 for vertically supporting the element part 3. Reference numeral 11 denotes an automatic matching device provided between the feeding point of the element unit 3 and the transceiver 15. The number of turns of the element part 3 can be appropriately selected within a range of 2 to 8 times, preferably within a range of 4 to 6 times.

[0013] Configuration element portion 3 of the element portion 5 turns the wire square (rectangle) (i.e., the loop 3e are five form) is constituted by, feeding unit by the beginning and end of the wire 4 are configured. The wire diameter of the wire may be selected in the range of 3.2 to 15.0 mm, preferably in the range of 3.5 to 5.5 mm. In this embodiment, an aluminum wire rod having a wire diameter of 4 mm is used. The aluminum wire was chosen because it is rust-resistant, lightweight, inexpensive and relatively easy to obtain. However, the wire is not limited to the aluminum wire, and for example, a copper wire or a stainless wire can be used. Alternatively, the wire diameters described above may be formed substantially by twisting or bundling thin wire rods made of these materials. Moreover, you may make it form the said substantial wire diameter by using a pipe material similarly to this. The wire rod may be formed of a bare wire, but may be covered to reduce deterioration over time.

[0014]   The wire rod that constitutes the element part 3—the perimeter L of the winding (indicated as 1/4 L in FIG. 1) Is the frequency used, that is, the lowest frequency Highest frequency (highest use) of 0.03 wavelengths or more of the lowest frequency) Frequency) of 1.2 wavelengths or less, preferably 0.05 to 0. ． The length is set to be the same as 5 wavelengths. For example, 3.5 MHz (MH z) is the lowest frequency used, the wavelength of this frequency is about 85.7 meters So, if we set the perimeter to 0.04 wavelength, we would get a perimeter of about 3.4 meters. It If the highest frequency used is, for example, 50 MHz, the wavelength is It is 6 meters. Here, compare the perimeter of 3.4 meters with the wavelength of 6 meters. And 0.56 wavelength. Since 0.56 wavelength is less than 1.2 wavelength, It is within the specified setting range.

[0015]   Each of the wire rods 3e forming the element portion 3 includes support arms 25, 25 ,. ． To the stoppers 26, 26 ,. ． ． Therefore, it is arranged and fixed at equal intervals through the line gap G. Has been done. The line spacing G is 5 to 50 mm, preferably 15 to 3 It has been found that setting 0 mm gives good results. This embodiment The element part 3 in the state is formed in a substantially square shape, but other shapes For example, it may be formed in a polygon other than a circle or a square.

Structure of Supporting Part The structure of the supporting part 5 will be described in detail with reference to FIGS. 1 and 2. The support part 5 includes a substantially cross-shaped connecting pipe (connecting member) 19 located at the center of the element part 3, horizontal arms 21 and 21 and vertical arms 23 and 23 fixed to the connecting pipe 19 and the respective arms. The support arms 25, 25 ,. ． And are equipped with. In this embodiment, only the connecting pipe 19 is made of metal in consideration of strength, and each arm is made of synthetic resin in consideration of insulation. The lower vertical arm 23 is connected to the support column 9, and the support column 9 is configured such that the upper portion thereof rotates in the horizontal direction together with the loop antenna 1 by the rotator 7. As shown in FIG. 1, in the present embodiment, the support portion 5 is configured such that the loop surface of the element portion 3 is oriented in the vertical direction, but the loop surface may be configured to be horizontal.

As a result of using the loop antenna, an aluminum wire rod having a wire diameter of 4 mm is set to have a perimeter L of 3.8 m (1/4 L = 0.95 m) and a line interval G of 22 mm. The following results were obtained when a loop antenna constructed by winding a wire in a substantially square shape 5 times was installed vertically at a height of 8 meters above the ground. Also, in the case of 6 turns, almost the same result was obtained. In these experiments, an automatic antenna tuner (AH-4) manufactured by Icom Co., Ltd. was used as an automatic matching device.

[0018]   First, regarding the directivity of the loop antenna, the direction parallel to the loop plane is the vertical direction. Since better results have been obtained, this loop antenna is almost parallel to the loop plane. It was confirmed to have a figure-8 characteristic in the direction (length direction of the horizontal arm). Then Zhou Although it is a result of use depending on the wave number band, amateur radio from 3.5 to 28 MHz In each frequency band for use (3.5, 7, 10, 14, 18, 21, 28), inside and outside Can communicate (receive and send) with amateur radio stations in the country, at least It turned out that it has sufficient performance as a communication antenna for Chua Radio. Well Also, since it is a loop antenna, the area occupied for its installation is also dipole ante. It also has the advantage that it can be made smaller than the other types. In addition, this loop antenna When installed horizontally, it was confirmed that it had omnidirectional characteristics.

[0019]

[Effect of device]

  According to the multi-turn loop antenna according to the present invention, in spite of its small size, It can be used for sending as well as receiving.

[Brief description of drawings]

FIG. 1 is a perspective view of a loop antenna.

FIG. 2 is a partially enlarged view of FIG.

[Explanation of symbols]

1 loop antenna 3 element part 4 power supply 5 Support 7 rotator 9 props 11 Automatic alignment device 15 transceiver 19 Connection member (connection pipe) 21 Horizontal arm 23 Vertical arm 25 Support arm 26 Stopper

Claims (3)

[Scope of utility model registration request] 1. A multi-turn loop antenna formed by winding a wire rod a plurality of times, wherein the wire rod has a substantial wire diameter of 3.2 to 1.
5 mm, the perimeter of each wire-winding is formed to be equal to 0.03 to 1.2 wavelength of the used frequency, and the distance between each loop is set to 5 to 50 mm. A multi-turn loop antenna, wherein the number is 2 to 8 times. 2. The multi-turn loop antenna according to claim 1, wherein the loop is formed in a substantially square shape. 3. The multi-turn loop antenna according to claim 1, wherein the loop surface is configured to be vertically installable.