JP4621169B2 - Small rotating body mounted antenna - Google Patents

Description

  The present invention relates to a small-sized rotating body-mounted antenna that can efficiently and stably transmit and receive signals while rotating itself while mounted on a rotating body such as an automobile wheel or a rotating roller.

Conventionally, dipole antennas, load antennas, Yagi antennas, and the like have been frequently used as antennas for VHF / UHF band wireless communication devices. The gain and radiation pattern of these antennas have their own characteristics and have been used according to their purpose. For example, Patent Document 1 discloses a small antenna that is used in an IC tag or a card. This small antenna is configured by forming a rectangular spiral pattern on a film-like base sheet.
JP 2001-160186 A

  However, the conventional small antenna disclosed in Patent Document 1 and the like can efficiently and stably transmit and receive signals to and from the outside when mounted on a rotating body such as an automobile wheel or a rotating roller and rotated. There was a problem that I could not.

  In other words, antenna radiation patterns such as existing dipole antennas, road antennas, Yagi antennas, and helical antennas have the characteristic that the radio wave intensity increases only in one direction. When communication is performed by attaching to the body, there has been a problem that the level of the received signal changes depending on the position of the external communication device or the rotation angle, causing communication failure.

  In other words, an antenna that converts electric signals into radio signals and transmits them has a specific conversion frequency depending on the wavelength and the size and shape of the antenna, and the radiation pattern from which the radio waves are radiated has a specific shape. . When the electromagnetic wave signal radiated from the antenna goes outside, the general antenna characteristic is that the reception intensity of the radio wave is different for each position where it is received. For this reason, when a conventional small antenna as described above is attached to a rotating body to transmit and receive radio waves, the intensity of the emitted radio waves changes depending on the position of the antenna mounted on the rotating body and the angle of the rotating body. In other words, the intensity of the received radio wave when the radio wave from the antenna is received at a fixed position also changes. At this time, the strength of the received radio wave has a complex relationship with the angle of the rotating body and the radiation pattern of the antenna, and the strength of the received radio wave is always received depending on the variable of the rotational speed of the rotating body and the radiation pattern of the antenna. The level will change. In such a case, if the radiation pattern is different at each position, a wave with a certain change in the strength of the received signal can be formed depending on the change in antenna gain and the number of rotations of the antenna. An interference signal that has not been generated will interfere with the receiver and cause an error. Interference signals that are not actually transmitted due to the relationship between the gain difference of the radiation pattern and the rotational speed enter the receiver and cause a communication error. Especially when the rotating body rotates at a high speed, a Doppler effect due to the rotation speed and the deflection of the radiation pattern occurs, and the reception signal vibrates and a signal shift occurs in the magnitude component and frequency component, resulting in communication failure. There is a fear. Therefore, there is a demand for an antenna that can maintain a constant radiation pattern at any angle at which the receiver is placed, in which the gain is not increased by one side.

  Also, unlike wireless communication base stations and portable terminals, there is little room to install a communication device on a rotating body such as an automobile wheel or rotating roller, and the centrifugal force of the rotating body when the antenna is mounted in a protruding state May not be mechanically stable and may be damaged. Therefore, a small antenna that does not protrude from the rotating body is desired.

  As described above, the antenna of a communication device that is used by being attached to a rotating body such as a wheel or a rotating roller of an automobile can maintain a constant radio wave radiation intensity in any direction, and can rotate by protruding from the rotating body. Although it is necessary to form it in a small size so as not to obstruct the rotation of the body, an antenna that satisfies such a requirement has not been developed.

  The present invention has been made paying attention to such problems of the prior art, and is attached to a rotating body such as a wheel or a rotating roller of an automobile so that radio waves can be efficiently and stably rotated while rotating by itself. An object of the present invention is to provide a small rotating body-mounted antenna capable of transmitting and receiving.

  A small rotating body mounting antenna according to the present invention for solving the above problems is mounted on a small rotating body mounted on an end surface of a rotating body such as an automobile wheel or a rotating roller or in the vicinity thereof. A type antenna, a disc-shaped dielectric substrate having a constant thickness, and a conductor line pattern formed on the dielectric substrate by an etching notation, having a constant line width, and the dielectric The overall length of the line is proportional to the wavelength of the frequency of the radio wave used so that it extends in a substantially circular spiral shape (spiral shape) from the approximate center of the substrate, and the interval between the lines is the line width. Of the line pattern, a through hole formed in the vicinity of the end of the dielectric substrate on the center side of the line pattern, and the line pattern The end on the center side A signal line for electrically connecting to the transmitting unit and / or the receiving unit through the through hole, and the rotating shaft of a rotating body such as an automobile wheel and a rotating roller together with the transmitting unit and / or the receiving unit. Mounting means for fixing to a plane orthogonal to the direction, and the line pattern is arranged such that the plane on which the line pattern is formed is parallel to the rotation direction of the rotating body, and The track pattern is arranged with respect to the rotating body such that the center of the line pattern coincides with the rotation center of the rotating body.

  A small rotating body mounted antenna according to the present invention is a small rotating body mounted antenna that is used by being mounted on an end surface of a rotating body such as an automobile wheel or a rotating roller or in the vicinity thereof. A disc-shaped dielectric substrate having a thickness, and a conductor line pattern formed on the dielectric substrate by an etching notation, having a constant line width and having a substantially rectangular shape from an approximate center of the dielectric substrate; The total length of the line is proportional to the wavelength of the frequency of the radio wave used, and the distance between the lines is about 5 to about 20 times the line width. The formed line pattern, the through hole formed in the vicinity of the center side end of the line pattern of the dielectric substrate, and the end of the line pattern on the center side, Transmitter and through through hole In order to fix the signal line for electrically connecting to the receiving unit and / or the signal line to the plane orthogonal to the rotation axis direction of the rotating body such as the automobile wheel and the rotating roller together with the transmitting unit and / or the receiving unit. And the line pattern is arranged such that the plane on which the line pattern is formed is parallel to the rotation direction of the rotating body, and the center of the line pattern is the center of the rotating body. It arrange | positions with respect to the said rotary body so that it may correspond with a rotation center, It is characterized by the above-mentioned.

  Furthermore, a small rotating body mounted antenna according to the present invention is a small rotating body mounted antenna that is used by being mounted on an end surface of a rotating body such as an automobile wheel or a rotating roller or in the vicinity thereof. A disc-shaped dielectric substrate having a thickness, and two conductor line patterns formed on the dielectric substrate in parallel with each other by etching notation, each of which is a constant line Each line has a width, extends from a substantially center of the dielectric substrate in a substantially circular spiral shape, and the entire length of the line is proportional to the wavelength of the frequency of the radio wave used. The two line patterns formed so that the distance between them is about 5 to about 20 times the line width, and the vicinity of the center side end of the two line patterns of the dielectric substrate Formed in A signal line for electrically connecting the through hole and each end on the center side of the two line patterns to the transmitting unit and / or the receiving unit through the through hole, And / or an attachment means for fixing to a plane orthogonal to the rotational axis direction of a rotating body such as an automobile wheel or a rotating roller, together with the receiving unit, and the two line patterns have the respective line patterns It is arranged with respect to the rotating body so that the formed plane is parallel to the rotating direction of the rotating body and the center of each line pattern coincides with the rotation center of the rotating body. It is characterized by that.

  In the present invention, a small rotating body mounted antenna is configured by forming a line pattern with a conductor such as a copper film on a dielectric substrate such as a PCB as a circuit board, for example, by etching. The line pattern is formed in a substantially spiral shape from the center of the substrate, and the line length is formed so as to match the communication frequency. Then, a line pattern is formed in such a shape that rotates spirally from the center of the rotating substrate to the outside at a constant interval, and at or near the end on the center side of such a spiral line pattern. A through hole is formed in the substrate, and the center end of the line pattern is communicated from the lower side of the substrate (the side where the line pattern is not formed) through the through hole (transmission or reception circuit). And the output of the communication device is radiated by radio waves through this antenna. As a result, a small rotating body-mounted antenna that can radiate the radiation pattern from any angle can be realized. When an antenna is manufactured by processing a line pattern in a spiral shape as in the present invention, radio waves are radiated on the printed line pattern and radiated at a constant intensity on the substrate on which the antenna radiation pattern is printed. Thus, the intensity of radio waves received from any place is kept constant. The length of the total line of the pattern formed in a continuous spiral is proportional to the wavelength of the frequency used for communication, and the used frequency is radiated at a constant level by matching.

  In the present invention, when etching a line pattern for an antenna on a dielectric substrate, the width of the line pattern to be etched is made as narrow as possible in order to ensure a length proportional to the wavelength of the operating frequency, The distance between the line patterns rotating in the shape is set to be about 5 to about 20 times the line pattern width. Accordingly, in the present invention, while the antenna size is reduced, the distance between the line patterns is sufficiently maintained (from about 5 times to about 20 times the line pattern width), and the adjacent line patterns are mutually connected. The inductive effect (mutual coupling effect) is prevented from occurring.

  According to the rotating body mounting antenna of the present invention, the rotating body is small and does not protrude from the rotating body when mounted on the rotating body such as an automobile wheel or a rotating roller by the mounting means. There is no risk of damage due to centrifugal force. Further, according to the rotating body mounting antenna of the present invention, since the radiation pattern is constant and the radio wave radiation intensity is kept constant from any angle, it is attached to a rotating body such as a wheel or a rotating roller of an automobile. It is possible to transmit and receive radio waves efficiently and stably even while rotating.

  That is, in the present invention, a spiral substantially square pattern or substantially circular pattern line is printed and formed on a dielectric substrate by an etching notation. At this time, the antenna is manufactured by etching so that the total length of the line is proportional to the wavelength of the frequency used, and the distance between the lines is about 5 to about 20 times the line width. Then, the end on the center side of the line pattern radiated spirally extends from the side opposite to the side where the line pattern is formed on the substrate to the side where the line pattern is formed on the substrate via the through hole of the substrate. The signal line connects to a wireless communication circuit (transmitter or receiver), and the output of the communication circuit is radiated as a radio wave through this antenna.

  According to the present invention, the radiation pattern is radiated from the spiral antenna on the substrate manufactured as described above, so that an effect of radiating a radio wave from the center of the substrate can be obtained. When the present inventor precisely measured the antenna gain and beam width (angular width) by dividing the range from 0 degrees to 360 degrees centered on the substrate at an interval of 10 degrees, the gain change was within 1 degree. It was confirmed that it was radiated constantly. It was also found that the 3 dBi beam width (3 dB Beam Width) was constant, and it did not tilt from any direction. In addition, when the present inventor compared and examined all of the case of the substantially square pattern and the case of the substantially circular pattern as the spiral radiation pattern, the radiation pattern of the substantially square pattern is more central than the case of the substantially circular pattern. The fan has a radiation pattern in the shape of a fan, but it has been found that the overall radiation pattern does not change even if the operating frequency changes. Further, according to the measurement by the present inventor, it has been found that the substantially circular spiral line pattern has a specific frequency to be radiated depending on the length of the total line. Further, according to the measurement by the present inventor, in the case of this substantially circular spiral line pattern, radio waves are radiated from any direction of 180 degrees on the printed circuit board on which the radiation pattern is printed, and 0 When the antenna gain and the radiation angle were measured at intervals of 10 degrees between 1 to 360 degrees, it was found that there was almost no difference between them, and that the radio wave intensity was radiated at a constant angle from any angle. As described above, according to the measurement by the present inventor, when the rotating body-mounted antenna according to the present invention is attached to a rotating body and used for wireless communication, communication with an external communication device does not occur and stable communication is not caused. It was found that the state can be maintained (when using a conventional antenna, a phenomenon such as a wave of radio field intensity occurs due to the constant synchronization between the rotational speed of the rotating body and the radiation pattern of the antenna, Often caused communication errors and communication problems with communication devices.

  As described above, according to the present invention, the radiation pattern of the antenna radiated from the spiral antenna on the substrate can obtain the effect that the radio wave is radiated from the substantially center of the substrate, and the beam width is also constant. An antenna that does not tilt radio waves in a specific direction can be realized. Therefore, according to the present invention, since the radiation pattern is radiated uniformly on the substrate and there is almost no difference in radio wave intensity depending on the radiation angle, there is almost no difference in radio wave intensity even when it is attached to a rotating body and rotated at high speed. An antenna that does not cause a communication error with a communication device or a communication failure can be realized. In particular, in the present invention, the line pattern is arranged so that the plane on which the line pattern is formed is parallel to the rotation direction of the rotating body (perpendicular to the rotation axis direction of the rotating body), and Since the center of the line pattern coincides with the rotation center of the rotating body, the radiation pattern from the antenna is constant with respect to the rotating direction of the rotating body even when the rotating body to be attached is rotating. And the difference in radio wave intensity depending on the radiation angle is almost eliminated.

  In the present invention, when etching a line pattern for an antenna on a dielectric substrate, the width of the line pattern to be etched is made as narrow as possible in order to ensure a length proportional to the wavelength of the operating frequency, The distance between the line patterns rotating in the shape is set to be about 5 to about 20 times the line pattern width. Therefore, according to the present invention, while keeping the antenna size small, the distance between the line patterns is sufficiently maintained (from about 5 times to about 20 times the line pattern width), and the distance between adjacent line patterns is reduced. It has become possible to prevent the mutual induction effect (mutual coupling effect) from occurring in the vicinity.

  The best mode for carrying out the present invention is a mode as described in Example 1 below.

  Hereinafter, a small rotating body-mounted antenna according to the first embodiment of the present invention will be described. FIG. 1-A is a perspective view showing a rotating body-mounted antenna according to the first embodiment, FIG. 1-A (a) is a view seen from the side where a line pattern is formed, and FIG. It is the figure seen from the back side. In FIG. 1A, 1 is a dielectric substrate, 2 is a substantially circular spiral line pattern formed on the dielectric substrate 1, 3 is a transmitting / receiving unit, 4a is the center side of the line pattern 2 of the substrate 1 Through holes formed below the end portion 2a of the substrate, 4b is a through hole formed below the end portion 2b outside the spiral line pattern 2 of the substrate 1, and 5a is the transmission portion 3 and the spiral. The signal line 5b for connecting the end 2a on the center side of the line pattern 2 via the through hole 4a connects the transmission / reception unit 3 and the end 2b outside the spiral line pattern 2 to the outside. This is a signal line for connection through the through hole 4b.

  In Example 1, an FR-4 (dielectric constant 4.8) substrate having a substrate thickness of 1 mm, a copper film thickness of 1/2 ounce, and a planar size of 20 mm × 20 mm is used as the substrate 1 used for etching the antenna. To do. On this FR-4 (dielectric constant 4.8) substrate 1, a thin antenna line pattern 2 having a width of 0.1 to 0.5 mm, preferably 0.2 mm, is formed by etching. At this time, the interval between the line patterns 2 printed in a spiral shape is set to be about 5 to about 20 times the line width so as to reduce the influence between the lines as much as possible. The length of the line pattern 2 is selected according to the wavelength of the used radio wave. Through holes 4a and 4b are formed in the substrate 1 at positions below both ends 2a and 2a of the line pattern 2, and the signal lines 5a and 5b arranged on the lower side of the substrate 1 and the through holes 4a and 4b The ends 2a and 2b of the line pattern 2 and the transmitting / receiving unit 3 are electrically connected. The printed line pattern 2 is formed in a substantially circular spiral shape. The length of the line pattern 2 is closely related to the wavelength of the frequency used for communication. If the frequency is low and the wavelength is long, the length of the pattern must be increased, and the frequency used is high and the wavelength is high. If the length is short, the length of the pattern line must be shortened to match the wavelength. At this time, it is desirable to ensure a sufficient interval between the lines (from about 5 times to about 20 times the line width) so that the mutual induction effect does not occur between the lines. . In the first embodiment, the interval between the lines is set to 2.0 mm, for example.

  Next, FIG. 1-B1 is a diagram illustrating a radio wave radiation pattern by the antenna of the first embodiment when a 500 MHz radio wave is used. Looking at the radio wave emission pattern at this time, as shown in FIG. 1-B1, a gain close to 8.4 dBi is obtained at all angles within 180 degrees. That is, in this case, 3 dB Beam Width (a beam width that is an angle until the gain decreases by 3 dB from the top when the radio wave emission pattern from the antenna is viewed) is 180 degrees. Therefore, according to the antenna of the first embodiment, when a 500 MHz radio wave is used, the radio wave intensity is constantly radiated from any angle within 180 degrees even when the radio wave rotates with the rotating body. It can be seen that stable communication is possible. In addition, the following table 1 is a table | surface which shows the measurement result in this case, and FIG. 1-B2 is a graph which shows the measurement result in this case.

  FIG. 1-C1 is a diagram illustrating a radio wave radiation pattern by the antenna of the first embodiment when a 1 GHz radio wave is used. Looking at the radio wave emission pattern at this time, as shown in FIG. 1-C1, the gain increases and decreases within 180 degrees. That is, in this case, the 3 dB Beam Width (beam width) is 76.1 degrees. Therefore, it can be seen that the antenna of the first embodiment is not very suitable for using 1 GHz radio waves. In addition, the following table 2 is a table | surface which shows the measurement result in this case, and FIG. 1-C2 is a graph which shows the measurement result in this case.

  FIG. 1-D1 is a diagram illustrating a radio wave radiation pattern by the antenna of the first embodiment when a 2 GHz radio wave is used. Looking at the radio wave emission pattern at this time, as shown in FIG. 1-D1, the gain increase and decrease is considerably large within 180 degrees. In other words, the 3 dB Beam Width (beam width) in this case is 43.0 degrees. Therefore, it can be seen that the antenna of the first embodiment is not very suitable for using a 2 GHz radio wave. In addition, the following table 3 is a table | surface which shows the measurement result in this case, and FIG. 1-D2 is a graph which shows the measurement result in this case.

  Next, FIG. 2A is a perspective view showing a state where the antenna according to the first embodiment is attached to the rotating roller, and FIG. 2B is a conceptual diagram showing a state where the antenna according to the first embodiment is attached to the rotating roller. It is. In FIG. 2A, 10 is a rotating roller constituting a part of a factory machine tool, 11 is a rotating shaft of the rotating roller 10, and 12 is a housing for housing the antenna 2 and the like of the first embodiment. .

  As shown in FIG. 2 (b), the antenna 12 and the transmission / reception unit 3 shown in FIG. 1, the sensor unit 13 connected to the transmission / reception unit 3, the antenna 2, and transmission / reception are provided inside the housing 12. The unit 3 and the battery unit 14 for supplying power to the sensor unit 13 are accommodated. As the sensor unit 13, for example, various types of sensors such as a temperature sensor, a rotation speed sensor, and a vibration sensor can be used.

  2B, reference numeral 12a denotes a base of the casing 12, and reference numeral 15 denotes a base 12a of the casing 12 on a rotating end surface 11a of the rotating shaft 11 (a plane perpendicular to the rotating direction of the rotating shaft 11). A bolt for attaching to the In the first embodiment, the case 12, the base 12a of the case, and the bolt 15 are the same as those in the present invention, “the antenna (with the transmitter and / or the receiver) rotates, such as an automobile wheel or a rotating roller. It corresponds to “attachment means for fixing to the end face of the body or its vicinity”.

  Although not shown in FIG. 2B, a storage unit (memory) connected to the sensor unit 13, the transmission / reception unit 3, and the battery unit 14 is also accommodated in the housing 12. Yes. In this storage unit, an identification number for each storage unit is recorded in advance. In addition, the storage unit receives “historical information such as attributes and failures / repairs regarding a rotating body (such as the rotating roller 10) to which the housing 12 is fixed” wirelessly transmitted from the outside via the transmission / reception unit 3. Recorded.

  As described above, according to the first embodiment, the antenna 2 is reduced in size and accommodated in the small casing 12, and is attached so that it hardly protrudes from the rotating end surface 11a of the rotating shaft 11. There is no fear that the housing 12 including 2 becomes an obstacle to the rotation of the rotating shaft 11 or is damaged by the rotation. In addition, according to the first embodiment, the antenna 2 is configured so that the radio wave intensity is radiated at any angle. Even if the antenna 2 is attached to the rotating shaft 11 and used for wireless communication, the antenna 2 can be connected to an external communication device. A stable communication state can be maintained without causing a communication failure.

  Next, a small rotating body-mounted antenna according to the second embodiment of the present invention will be described with reference to FIG. In FIG. 3A, parts common to FIG. In FIG. 3A, reference numeral 22 denotes a substantially rectangular (substantially square) spiral line pattern of a conductor formed on the surface 1a of the dielectric substrate 1, and 22a denotes an end portion on the center side of the spiral line pattern 22. , 22b are outer ends of the spiral line pattern 22. As described above, the second embodiment is different from the first embodiment in that the line pattern 22 formed on the dielectric substrate 1 is formed in a substantially rectangular spiral shape instead of a substantially circular spiral shape. Is different. Except for this point, the configuration of the second embodiment is substantially the same as that of the first embodiment, and the other explanation is omitted.

  Next, FIG. 3B1 is a diagram illustrating a radio wave radiation pattern by the antenna of the second embodiment when a 500 MHz radio wave is used. Looking at the radio wave emission pattern at this time, as shown in FIG. 3B1, a gain close to 11.1 dBi is obtained at an angle within 127.8 degrees. That is, in this case, the 3 dB Beam Width (beam width) is 127.8 degrees, and a considerably wide beam width is obtained. Therefore, according to the antenna of the second embodiment, when a 500 MHz radio wave is used, the radio wave intensity is radiated almost uniformly from any angle within 127.8 degrees even when rotating with the rotating body. It can be seen that efficient and stable communication is possible to some extent. In addition, the following table 4 is a table | surface which shows the measurement result in this case, and FIG. 3-B2 is a graph which shows the measurement result in this case.

  FIG. 3C1 is a diagram illustrating a radio wave radiation pattern by the antenna of the second embodiment when using a 1 GHz radio wave. Looking at the radio wave emission pattern at this time, as shown in FIG. 3C1, a gain close to 6.8 dBi is obtained at an angle within 117.5 degrees. That is, in this case, the 3 dB Beam Width (beam width) is 117.5 degrees, and a considerably wide beam width is obtained. Therefore, according to the antenna of the second embodiment, when the IGHz radio wave is used, the radio wave intensity is radiated almost uniformly from any angle within 117.5 degrees even when rotating with the rotating body. It can be seen that efficient and stable communication is possible to some extent. In addition, the following table 5 is a table | surface which shows the measurement result in this case, and FIG. 3-C2 is a graph which shows the measurement result in this case.

  FIG. 3-D1 is a diagram illustrating a radio wave radiation pattern by the antenna of the second embodiment when a 2 GHz radio wave is used. Looking at the radio wave emission pattern at this time, as shown in FIG. 3-D1, a gain close to 5.8 dBi is obtained at an angle within 106.9 degrees. That is, in this case, the 3 dB Beam Width (beam width) is 106.9 degrees, and a considerably wide beam width is obtained. Therefore, according to the antenna of the second embodiment, when a 2 GHz radio wave is used, the radio wave intensity is radiated almost uniformly from any angle within 106.9 degrees even when rotating with the rotating body. It can be seen that efficient and stable communication is possible to some extent. In addition, the following table 6 is a table | surface which shows the measurement result in this case, and FIG. 3-D2 is a graph which shows the measurement result in this case.

  Next, a small rotating body-mounted antenna according to Embodiment 3 of the present invention will be described with reference to FIG. In FIG. 4-A, parts common to those in FIG. In FIG. 4A, 32 and 33 are substantially circular spiral line patterns of conductors formed on the dielectric substrate 1, respectively, 32a and 33a are outer ends of the spiral line patterns 32 and 33, and It is. In the third embodiment, as shown in FIG. 4A, the two substantially circular spiral line patterns 32 and 33 are formed in parallel to each other. Further, the outer end portions 32a and 33b of the two substantially circular spiral line patterns 32 and 33 are illustrated on the substrate 1 through the respective through holes not shown in FIG. Each of the signal lines 5a and 5b extending on the back side is connected to each other. These signal lines 5 a and 5 b are connected to the transmission / reception unit 3. Further, the end portions on the center side of the two substantially circular spiral line patterns 32 and 33 are connected to each other. Except for these points, the configuration of the third embodiment is substantially the same as that of the first embodiment, so that the description of the third embodiment except for the above points is saved.

  Next, FIG. 4-B1 is a diagram illustrating a radio wave radiation pattern by the antenna of the third embodiment when a 500 MHz radio wave is used. Looking at the radio wave emission pattern at this time, as shown in FIG. 4-B1, a gain close to 6.5 dBi is obtained at an angle within 126.5 degrees. That is, in this case, the 3 dB Beam Width (beam width) is 126.5 degrees, and a considerably wide beam width is obtained. Therefore, according to the antenna of the third embodiment, when a 500 MHz radio wave is used, the radio wave intensity is radiated almost uniformly from any angle within 126.5 degrees even when rotating with the rotating body. It can be seen that efficient and stable communication is possible to some extent. In addition, the following table 7 is a table | surface which shows the measurement result in this case, and FIG. 4-B2 is a graph which shows the measurement result in this case.

  FIG. 4-C1 is a diagram illustrating a radio wave radiation pattern by the antenna of the third embodiment when a 1 GHz radio wave is used. Looking at the radio wave emission pattern at this time, as shown in FIG. 4-C1, a gain close to 5.5 dBi is obtained at an angle within 131.9 degrees. That is, in this case, the 3 dB Beam Width (beam width) is 131.9 degrees, and a considerably wide beam width is obtained. Therefore, according to the antenna of the third embodiment, when the IGHz radio wave is used, the radio wave intensity is radiated almost uniformly from any angle within 131.9 degrees even when rotating with the rotating body. It can be seen that efficient and stable communication is possible to some extent. In addition, the following table 8 is a table | surface which shows the measurement result in this case, and FIG. 4-C2 is a graph which shows the measurement result in this case.

  The embodiments of the present invention have been described above. However, the present invention and the constituent elements constituting the present invention are limited to those described as the respective embodiments and the respective elements constituting the respective embodiments, respectively. Various modifications and changes are possible. The present invention includes modifications and variations that are within the scope of the appended claims and their equivalents.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure for demonstrating Example 1 of this invention, (a) is a perspective view which shows this Example 1 from the side in which the track pattern was formed, (b) is a perspective view shown from the other side. The figure which shows the electromagnetic wave radiation pattern by the antenna of the present Example 1 when using a 500-MHz electromagnetic wave. The graph which shows the measurement result of the radio wave radiation pattern by the antenna of the present Example 1 when using a 500 MHz radio wave. The figure which shows the electromagnetic wave radiation pattern by the antenna of the present Example 1 when using a 1 GHz electromagnetic wave. The graph which shows the measurement result of the radio wave radiation pattern by the antenna of the present Example 1 when using a 1 GHz radio wave. The figure which shows the electromagnetic wave radiation pattern by the antenna of the present Example 1 when using a 2 GHz electromagnetic wave. The graph which shows the measurement result of the radio wave radiation pattern by the antenna of the present Example 1 when using a 2 GHz radio wave. It is a figure for demonstrating the structure for fixing this Example 1 to the end surface of the rotating shaft of a rotating roller, (a) is a perspective view which shows a rotating roller and this Example 1, (b) is this Example 1. The conceptual diagram which shows the state which attached to the rotating shaft. It is a figure for demonstrating Example 2 of this invention, (a) is a perspective view which shows this Example 2 from the side in which the line pattern was formed, (b) is a perspective view shown from the other side. The figure which shows the radio wave radiation pattern by the antenna of the present Example 2 when using a 500-MHz radio wave. The graph which shows the measurement result of the radio wave radiation pattern by the antenna of the present Example 2 when using a 500 MHz radio wave. The figure which shows the electromagnetic wave radiation pattern by the antenna of the present Example 2 when using a 1 GHz electromagnetic wave. The graph which shows the measurement result of the radio wave radiation pattern by the antenna of the present Example 2 when using a 1 GHz radio wave. The figure which shows the electromagnetic wave radiation pattern by the antenna of the present Example 2 when using a 2 GHz electromagnetic wave. The graph which shows the measurement result of the radio wave radiation pattern by the antenna of the present Example 2 when using a 2 GHz radio wave. The perspective view which shows Example 3 of this invention from the side in which the track pattern was formed. The figure which shows the radio wave radiation pattern by the antenna of the present Example 3 when using a 500-MHz radio wave. The graph which shows the measurement result of the radio wave radiation pattern by the antenna of the present Example 3 when using a 500 MHz radio wave. The figure which shows the electromagnetic wave radiation pattern by the antenna of the present Example 3 when using a 1 GHz electromagnetic wave. The graph which shows the measurement result of the radio wave radiation pattern by the antenna of the present Example 3 when using a 1 GHz radio wave.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Dielectric board | substrate 2, 22, 32, 33 Line pattern 2a, 2b, 32a, 33b End part 3 Transmission / reception part 4a, 4b Through hole 5a, 5b Signal line 10 Rotating roller 11 Rotating shaft 11a Rotating end surface 12 Case 12a Base 13 Sensor part 14 Battery part 15 Volts

Claims (3)

A small rotating body mounted antenna used by being mounted on an end surface of a rotating body such as an automobile wheel or a rotating roller or in the vicinity thereof,
A disk-shaped dielectric substrate having a certain thickness;
A conductor line pattern formed on the dielectric substrate by etching notation, having a constant line width, extending from a substantially center of the dielectric substrate in a substantially circular spiral shape, and the line A line pattern formed so that the distance between the lines is about 5 to about 20 times the line width;
A through hole formed in the vicinity of the center side end of the line pattern of the dielectric substrate;
A signal line for electrically connecting an end portion on the center side of the line pattern to the transmission unit and / or the reception unit through the through hole,
Attaching means for fixing itself together with the transmitter and / or receiver to a plane perpendicular to the rotational axis direction of a rotating body such as an automobile wheel and a rotating roller;
With
The rotation of the line pattern so that the plane on which the line pattern is formed is parallel to the rotation direction of the rotating body, and the center of the line pattern coincides with the rotation center of the rotating body. A small rotating body-mounted antenna, characterized in that the antenna is arranged with respect to the body. A small rotating body mounted antenna used by being mounted on an end surface of a rotating body such as an automobile wheel or a rotating roller or in the vicinity thereof,
A disk-shaped dielectric substrate having a certain thickness;
A conductor line pattern formed on the dielectric substrate by etching notation, having a constant line width, extending from a substantially center of the dielectric substrate in a substantially rectangular spiral shape, and the line A line pattern formed so that the distance between the lines is about 5 to about 20 times the line width;
A through hole formed in the vicinity of the center side end of the line pattern of the dielectric substrate;
A signal line for electrically connecting an end portion on the center side of the line pattern to the transmission unit and / or the reception unit through the through hole,
Attaching means for fixing itself together with the transmitter and / or receiver to a plane perpendicular to the rotational axis direction of a rotating body such as an automobile wheel and a rotating roller;
With
The rotation of the line pattern so that the plane on which the line pattern is formed is parallel to the rotation direction of the rotating body, and the center of the line pattern coincides with the rotation center of the rotating body. A small rotating body-mounted antenna, characterized in that the antenna is arranged with respect to the body. A small rotating body mounted antenna used by being mounted on an end surface of a rotating body such as an automobile wheel or a rotating roller or in the vicinity thereof,
A disk-shaped dielectric substrate having a certain thickness;
A line pattern of two conductors formed on the dielectric substrate substantially in parallel with each other by etching notation, each having a constant line width and a substantially circular spiral from the approximate center of the dielectric substrate. The total length of each line is made to correspond to the wavelength of the frequency of the radio wave to be used, and the distance between each line is about 5 to about 20 times the line width. And two formed line patterns,
A through hole formed in the vicinity of the center side end of the two line patterns of the dielectric substrate;
A signal line for electrically connecting each end on the center side of the two line patterns to the transmitting unit and / or the receiving unit via the through hole,
Attaching means for fixing itself together with the transmitter and / or receiver to a plane perpendicular to the rotational axis direction of a rotating body such as an automobile wheel and a rotating roller;
With
The two line patterns are arranged such that the plane on which each line pattern is formed is parallel to the rotation direction of the rotating body, and the center of each line pattern coincides with the rotation center of the rotating body. A small rotating body-mounted antenna, characterized in that the antenna is disposed with respect to the rotating body.

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