JP2009005104A - High frequency circuit and antenna - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a collinear antenna with an excellent omnidirectivity and a wideband property. <P>SOLUTION: There are provided a first substrate 10 and a second substrate 20. The first substrate 10 comprises, on the surface of a flexible insulated board 11, a feeder 14 and a plurality of antenna elements 12 to which the feeder 14 is branched and connected and the second substrate 20 comprises a ground pattern 22 all over the surface of a flexible insulated board 21. The rear side of the first substrate 10 is overlaid on the front side of the second substrate 20, the first and second substrates 10 and 20 are rolled in a tubular shape to expose the first substrate 10, a triplate line is formed by covering upper and lower faces of the feeder 12 with the ground pattern 22, and the antenna elements 12 are exposed on the outer face of the triplate line. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a high-frequency circuit composed of a triplate line and an antenna using the same.

  As an omnidirectional antenna, (1) a structure in which power is serially fed to an antenna element arranged in a straight line in the axial direction by a wire, a coaxial cable, a printed board, etc. (see Non-Patent Documents 1, 2, and 3), A parallel feed with the same structure, (3) A structure in which a plurality of patch antennas are wound around a metal cylinder and a series feed is performed (Non-Patent Document 4), (4) A structure for sharing polarization (Non-patent) Documents 5) and (5) have a structure (Non-patent Document 6) in which patch antennas are arranged on two front and back surfaces of a prism.

Johnson, Richard and Jasik, Henry (ed.), "Antnna Engineering Handbook", Second Edition McGraw Hill, 1984, pp. 14-27 Randy.Bancroft and Blaine Bateman, "An Omnidirectional Planar Microstrip Antenna", IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, VOL.52, NO.11, NOVEMBER.2004, pp3151-3153 kin-Lu Wong et al., "Omnidirectional Planar Dipole Array Antenna", IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, VOL.52, NO.2, FEBRUARY.2004, pp.624-628. N. Herscovic, "The Cylindrical Omnidirectional Patch Antenna", IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, VOL.49, NO.12, DECEMBER.2001, pp. 1746-1753. Oshima Tsuyoshi, "2 GHz Band Polarization Shared Omni Antenna", 2003, IEICE Communication Society Conference, page 149 Matsushita, “Effects of parasitic patches on two-plane vertical polarization omnidirectional antennas”, 2005, 85th IEICE Communication Society Conference.

  However, although the structure (1) has the advantage that it can be produced at low cost because the structure is simple, there is a problem that the frequency characteristic becomes a narrow band because of the series feeding. The structure (2) has an advantage that the frequency characteristic becomes wide because of parallel feeding. However, since the feeding line is exposed, the antenna element interferes with the feeding line and disturbs the directivity. Unable to get omnidirectional characteristics. In addition, the structure (3) has no space in the feed line, so it must be a series feed, and the frequency band is narrow. In addition, the structure (4) is three-dimensional and therefore has a large number of parts, making it difficult to produce at a low cost, and there is no room for a feed line, and there is a problem similar to (3). Furthermore, the structure of (5) also has the same problem as (3) because the size of the cylinder has to be reduced in order to improve the omnidirectional characteristics, and there is no room for the feed line.

  An object of the present invention is to provide a high-frequency circuit having a tri-plate line feed line with an easy configuration of a parallel feed line and an antenna using the same.

In order to achieve the above object, a high-frequency circuit according to a first aspect of the present invention includes a first substrate in which a feeder line is provided on the surface of a flexible insulating substrate, and a ground pattern on the surface of the flexible insulating substrate. A second substrate, and the back surface of the first substrate is overlaid on the front surface of the second substrate, and the first and second substrates are wound into a cylindrical shape so that the first substrate is outside, The feeder line is covered with the ground pattern to form a triplate line.
According to a second aspect of the present invention, in the high-frequency circuit according to the first aspect, the first substrate is replaced with a first conductive plate having the same shape as the feeder line, and / or the second substrate is replaced with the ground pattern. Replacing the second conductive plate with the same shape, the first substrate and the second conductive plate, the first conductive plate and the second substrate, or the first conductive plate and the second conductive plate via an insulating sheet It is characterized by being rolled into a cylindrical shape.
According to a third aspect of the present invention, there is provided an antenna having a first substrate provided with a feed line and an antenna element connected to the feed line on a surface of a flexible insulating substrate, and a ground pattern provided on the surface of the flexible insulating substrate. A second substrate, and the first substrate and the second substrate are wound in a cylindrical shape with the back surface of the first substrate overlaid on the front surface of the second substrate. The feeding line is covered with the ground pattern to form a triplate line, and the antenna element is located on the outer surface of the triplate line.
The invention according to claim 4 is the antenna according to claim 3, wherein the first substrate is replaced with a first conductive plate having the same shape as the feeder line and the antenna element, and / or the second substrate is replaced with the first substrate. Replace the second conductive plate with the same shape as the ground pattern, and insulate the first substrate and the second conductive plate, the first conductive plate and the second substrate, or the first conductive plate and the second conductive plate. It is characterized by being wound into a cylindrical shape via a sheet.
According to a fifth aspect of the invention, in the antenna according to the third or fourth aspect, a plurality of the antenna elements are provided so as to be aligned in the axial direction of the winding.
According to a sixth aspect of the present invention, in the antenna according to the fifth aspect, the feeding line is wired so that feeding to the plurality of antenna elements is parallel feeding.
The invention according to claim 7 is the antenna according to claim 3, 5 or 6, characterized in that a parasitic patch element positioned on the upper surface of the antenna element in the wound state is provided on the second substrate. To do.

  According to the high-frequency circuit of the present invention, since the feed line is formed by a triplate line, a feed line that does not adversely affect others can be configured, a parallel feed line can be easily configured, and the structure is cylindrical. Therefore, it can be arranged in a narrow cylinder. Further, according to the antenna of the present invention, it is configured in a cylindrical shape so that the antenna element is exposed to the outside of the feeding line of the triplate line, but the feeding line and the antenna element do not interfere with each other, and directivity characteristics are improved. There is no negative impact. If a plurality of antenna elements are arranged in the axial direction of the cylinder, a omnidirectional collinear antenna can be formed, and a wide band can be realized by parallel feeding.

<First embodiment>
FIG. 1 is a development view of a collinear antenna according to a first embodiment of the present invention. Reference numeral 10 denotes a first substrate, and four antenna elements (patch elements) 12 are arranged on the surface of the flexible insulating substrate 11 at equal pitches in the vertical direction. A power supply line 14 extending to one power supply terminal 13 is wired. The feed line 14 is branched and wired in two stages so that the distance from the feed terminal 13 to each antenna element 12 is equal. In this embodiment, in order to obtain the maximum gain in the horizontal direction, the excitation distribution of each antenna element is designed to be uniform and in phase, but the vertical in-plane direction such as tilting the maximum gain direction downward is used. When the characteristics are formed, the excitation distribution of each antenna element can be controlled by adjusting the line length of the feed line and the distribution ratio of the branches by the same method as that of the planar triplate line. Reference numerals 15, 16, and 17 are five positioning holes formed at equal pitches in the vertical direction at positions away from the antenna element 12 and the feed line 14, and the steps are arranged in the horizontal direction.

  Reference numeral 20 denotes a second substrate, and a ground pattern 22 is disposed on the entire surface of the flexible insulating substrate 21. Reference numerals 25, 26 and 27 are positioning holes similar to the positioning holes 15, 16 and 17 of the first substrate 10.

  Reference numeral 30 denotes a first foam sheet and reference numeral 40 denotes a second foam sheet, both of which function as flexible insulating spacers. Positioning holes 35, 36, and 37 similar to the positioning holes 15, 16, and 17 of the antenna substrate 10 are formed in the foam sheet 30. In addition, positioning holes 45 and 46 similar to the positioning holes 15 and 16 of the antenna substrate 10 are formed in the foam sheet 40.

  To assemble this, as shown in FIG. 2 (a), the second substrate 20, first foam sheet 30, The first substrate 10 and the second foam sheet 40 with the surface on which the antenna element 12 and the feeder line 14 are formed as the upper surface are sequentially stacked, and the positioning holes 15, 25, 35, and 45 are aligned with each other. The polymer sheet is wound around the cylinder 50 so that 26, 36, and 46 are matched.

  After the winding is finished, insulating screws 60 (five in total) are inserted into the respective positioning holes 15 to 17, 25 to 27, 35 to 37, 45, and 46 arranged in the vertical direction to the holes 55 of the cylinder 50. Screw and hold the state of the polymerized sheet. At this time, the first and second foam sheets 30 and 40 function as insulating spacers. As a result, as shown in FIGS. 2B and 3, the width of the antenna element 12 in the lateral direction a (see FIG. 1) forms a length of almost one turn (see FIGS. 3C-C). Thus, four antenna elements 12 are arranged in a straight line in the axial direction of the cylinder 50.

  In the winding described above, the second substrate 20 is initially positioned on the lower side of the power supply line 14, but is positioned on the upper side of the power supply line 14 when the winding proceeds and enters the second turn beyond the first turn. For this reason, the width b (see FIG. 1) of the feeder line 14 is a triplate line (both upper and lower surfaces sandwiched by the ground pattern 22 of the second substrate 20 on the inner side closer to the cylinder 50 than the antenna element 12). 3C-C). Therefore, interference with the antenna element 12 of the feeder 14 is suppressed.

  Further, since the second round portion of the ground pattern 22 of the second substrate 20 is located below the antenna element 12, it behaves as a ground for the antenna element 12, and is almost the same as a cylindrical conformal antenna. It becomes possible to exhibit various characteristics. By adjusting the width a (see FIG. 1) of the antenna element 12, omnidirectional characteristics in a horizontal plane can be obtained.

  Further, the feed line 14 is hidden in the antenna as a triplate line as described above, and feeds power to each antenna element 12 in parallel. For this reason, even if the frequencies are different, since power is supplied to each antenna element 12 under the same conditions, it is possible to operate in a wide band.

<Second Embodiment>
FIG. 4 is a development view of the collinear antenna of the second embodiment of the present invention. In this embodiment, the second substrate 20 in the first embodiment is replaced with a second substrate 20A indicated by reference numeral 20A, and the second foam sheet 40 is replaced by a second foam sheet 40A indicated by reference numeral 40A.

  In the second substrate 20A, the lateral width is extended by one turn and a positioning hole 28 is added. The conductor pattern of the second substrate 20 </ b> A includes a ground pattern 22 a and a parasitic patch element 22 b corresponding to the antenna element 12 of the first substrate 10. Reference numeral 29 denotes an insulating region in which no conductor pattern is formed. The second foam sheet 40 </ b> A also has a positioning hole 47 by extending the lateral width by one round.

  In the present embodiment, in the assembly, as shown in FIG. 5A, the second substrate 20A, the first substrate 20A, the first substrate 20A having the ground pattern 22a and the conductor pattern 22b formed on the insulating cylinder 50 are formed. The first substrate 10 and the second foam sheet 40A having the foam sheet 30, the surface on which the antenna element 12 and the feeder line 14 are formed as the upper surface are sequentially stacked, and the positioning holes 15, 25, 35, 45 are matched, The superposition sheet is wound around the cylinder 50 so that the positioning holes 16, 26, 36, 46 are matched.

  After the winding is finished, insulating screws (five in total) are inserted into the positioning holes 15 to 17, 25 to 28, 45 to 37, and 45 to 47 aligned in the vertical direction and screwed into the holes 55 of the cylinder 50. The state of the polymerization sheet is maintained.

  In the present embodiment, in addition to the operational effects of the first embodiment, the triplate line is also configured by the ground pattern 22a for the portion of the feed line 14 in the width a. Thus, the interference between the feeder 14 and the antenna element 12 is more effective. In addition, since the parasitic patch is positioned on the upper surface of the antenna element 12 in a non-contact manner, the band characteristics are further improved.

  FIG. 6 shows the directivity characteristics in the vertical plane and the horizontal plane of the collinear antenna of this example. The three frequencies (2.50 GHz, 2.55 GHz, 2.60 GHz) exhibit substantially the same characteristics (broadband characteristics), and in particular, the directivity characteristics in the horizontal plane indicate non-directivity.

<Other examples>
The first and second embodiments described above relate to a collinear antenna. However, by removing the antenna element 12 and arranging only the feed line 14, a cylindrical triplate feed line is configured. Can do. When a collinear antenna with a plurality of antenna elements arranged in the axial direction is arranged on the outer surface of the cylinder as a separate configuration, the feeding power of the cylindrical triplate is fitted in the cylinder of the collinear antenna to The line enables parallel feeding to a plurality of antenna elements.

  Further, the first substrate 10 is replaced with a conductive plate having the same shape as the antenna element 12 and the feeder line 14, and the second substrate 20 is also replaced with the same conductive plate as the ground pattern 22, and both the conductive plates are formed by the foam sheets 30 and 40. A collinear antenna may be configured by securing the insulation between the two and winding them in a cylindrical shape.

It is an expanded view of the collinear antenna of 1st Example of this invention. It is explanatory drawing of winding of each antenna component of FIG. It is sectional drawing of AA of FIG.2 (b), BB, CC, DD. It is an expanded view of the collinear antenna of 2nd Example of this invention. It is explanatory drawing of winding of each antenna component of FIG. It is a characteristic view of the collinear antenna of FIG.5 (b).

Explanation of symbols

DESCRIPTION OF SYMBOLS 10: 1st board | substrate, 11: Insulating board | substrate, 12: Antenna element, 13: Feeding terminal, 14: Feeding line, 15-17: Positioning hole 20, 20A: 2nd board | substrate, 21: Insulating board | substrate, 22, 22a: Grounding Pattern, 22b: Parasitic patch element, 25-28: Positioning hole, 29: Insulating region 30: First foam sheet, 35-37: Positioning hole 40, 40A: Second foam sheet, 45-47: Positioning hole

Claims (7)

  A first substrate having a power supply line provided on a surface of a flexible insulating substrate; and a second substrate having a ground pattern provided on the surface of the flexible insulating substrate, wherein the first substrate is provided on the surface of the second substrate. The first and second substrates are wound in a cylindrical shape so that the first substrate is on the outside, with the back surface of one substrate overlapped, and the upper and lower surfaces of the feeder line are covered with the ground pattern, forming a triplate line A high-frequency circuit characterized by being made. The high-frequency circuit according to claim 1,
Replacing the first substrate with a first conductive plate having the same shape as the feeder line; and / or replacing the second substrate with a second conductive plate having the same shape as the ground pattern;
The first substrate and the second conductive plate, the first conductive plate and the second substrate, or the first conductive plate and the second conductive plate are wound into a cylindrical shape via an insulating sheet, High-frequency circuit.   A first substrate having a feeder line and an antenna element connected to the feeder line on the surface of a flexible insulating substrate; and a second substrate having a ground pattern provided on the surface of the flexible insulating substrate. The back surface of the first substrate is overlaid on the front surface of the two substrates, the first and second substrates are wound into a cylindrical shape so that the first substrate is on the outside, and the feeder line is An antenna, wherein a lower surface is covered to form a triplate line, and the antenna element is positioned on an outer surface of the triplate line. The antenna according to claim 3,
Replacing the first substrate with a first conductive plate having the same shape as the feeder line and the antenna element; and / or replacing the second substrate with a second conductive plate having the same shape as the ground pattern;
The first substrate and the second conductive plate, the first conductive plate and the second substrate, or the first conductive plate and the second conductive plate are wound into a cylindrical shape via an insulating sheet, Antenna. The antenna according to claim 3 or 4,
A plurality of antenna elements are provided so as to be arranged in the axial direction of the winding. The antenna according to claim 5, wherein
An antenna, wherein the feeder line is wired so that feeding to the plurality of antenna elements is parallel feeding. The antenna according to claim 3, 5 or 6,
An antenna, wherein a parasitic patch element positioned on an upper surface of the antenna element in the wound state is provided on the second substrate.

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