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JP-7856321-B2 - Small wideband antenna

JP7856321B2JP 7856321 B2JP7856321 B2JP 7856321B2JP-7856321-B2

Inventors

  • 倉本 晶夫
  • 大山 隆幸

Assignees

  • ＮＥＣプラットフォームズ株式会社

Dates

Publication Date
20260511
Application Date
20231226

Claims (10)

  1. A ground plate having ground surfaces parallel to the X and Y directions, A power supply plate provided on the ground surface, A power supply unit is provided between the ground plate and the power supply plate, and supplies a high-frequency signal to the power supply plate, A housing that covers the ground surface, the power supply unit, and the power supply plate, The upper plate of the housing on the ground surface, and a slot provided in the upper plate facing the ground surface, Equipped with, The aforementioned power supply board is A first portion connected to the power supply unit and extending in the Z direction, A second portion extending in the opposite direction to the X direction from the end of the first portion that extends in the Z direction, It has a third portion that extends in the opposite direction to the Z direction from the end of the second portion that extends in the opposite direction to the X direction and connects to the ground plate, The aforementioned slot is A single line slot extending in the Y direction, or A dog horn slot extending in the X direction, splitting into two branches along its extension, one branch extending in the X direction and the other extending in the Y direction, and further splitting into two branches at the end of the Y direction, one branch extending in the X direction and the other extending in the opposite direction to the X direction. When viewed from the Z direction, a part of the doghorn slot and a part of the power supply plate overlap, The ground plate, the power supply plate, and the housing are composed of conductors. A small, wideband antenna.
  2. The length of the first portion of the power supply plate in the Y direction decreases as you move in the opposite direction to the Z direction. A compact, wideband antenna according to claim 1.
  3. The maximum length of the second portion of the power supply plate in the Y direction is greater than the maximum length of the first portion in the Y direction. The maximum length of the second portion of the power supply plate in the Y direction is greater than the maximum length of the third portion in the Y direction. A compact, wideband antenna according to claim 1.
  4. The power supply plate has a recessed shape in part of the second portion of the power supply plate. A compact, wideband antenna according to claim 1.
  5. The shape of the power supply plate as viewed from the Y direction is an arc shape. A compact, wideband antenna according to claim 1.
  6. The system further comprises a radome made of a dielectric material that covers the aforementioned slot. A compact, wideband antenna according to claim 1.
  7. The dielectric of the radome is formed from fiber-reinforced plastics (FRP). The compact broadband antenna according to claim 6.
  8. The aforementioned power supply unit is The core wire connected to the power supply plate, Having an external conductor connected to the ground plate, A compact, wideband antenna according to claim 1.
  9. The shape of the doghorn slot is H-shaped when viewed from the Z direction. A compact, wideband antenna according to claim 1.
  10. The length of the housing in the X direction is 0.4 to 0.5 times the wavelength of the high-frequency signal. The length of the housing in the Y direction is 0.4 to 0.5 times the wavelength of the high-frequency signal. The length of the housing in the Z direction is 0.12 to 0.14 times the wavelength of the high-frequency signal. The length of the second portion of the power supply plate in the X direction is 0.12 to 0.14 times the wavelength of the high-frequency signal, and the length of the third portion of the power supply plate in the Z direction is 0.09 to 0.11 times the wavelength of the high-frequency signal. A compact, wideband antenna according to claim 1.

Description

This disclosure relates to a compact, wideband antenna, and more particularly to a compact, wideband antenna that can be realized in a small size and used in a wide frequency band. Small, wideband antennas are a crucial technology because they can be embedded in building ceilings as mobile communication base station antennas, or mounted on aircraft fuselages to minimize air resistance. Patch antennas, monopole antennas, or dipole antennas are used for both mobile communication base station antennas and aircraft-mounted antennas. These antennas are covered with a radome, a dielectric material, to protect them from wind, rain, snow, hail, etc. The radome is made of materials such as FRP (Fiber Reinforced Plastics), which are more expensive than metal materials in terms of both material and molding, and also have inferior environmental resistance. Therefore, there is a desire to miniaturize both the antenna and the radome. Furthermore, with the explosive increase in demand for mobile communications, various frequencies are being used for mobile communications, and there is a need to realize antennas that can handle wideband frequencies. Patent Document 1 describes an antenna device comprising a ground plate, a linear feeding element, and two mushroom cells. The linear feeding element is a linear conductor element arranged parallel to the ground plate, with its end connected to a feeding circuit. Each mushroom cell has a mushroom structure combining an opposing conductor plate parallel to the ground plate and a short-circuit section electrically connecting the center of the opposing conductor plate to the ground plate. Each mushroom cell is arranged in a line along the linear feeding element. Patent Document 1 does not disclose a compact, broadband antenna that can be realized in a small size and used in a wide frequency band. Patent Document 2 describes a slot antenna comprising: a first conductive member having a first conductive surface; a second conductive member having a second conductive surface facing the first conductive surface; a waveguide member located between the first and second conductive members, having a stripe-shaped conductive waveguide facing the first conductive surface, and extending in a first direction along the first conductive surface; and artificial magnetic conductors located on both sides of the waveguide member between the first and second conductive members, wherein the first conductive member has a slot, and the slot is a composite slot having a pair of vertical portions and a horizontal portion connecting the pair of vertical portions, the horizontal portion facing the waveguide and intersecting the first direction. Patent Document 2 does not disclose an antenna using a loop-shaped feed plate. Furthermore, Patent Document 2 does not disclose a compact, broadband antenna that can be realized in a small size and used in a wide frequency band. International Publication No. 2022/202623Special Publication No. 2018-511951 This is a perspective view illustrating a small, broadband antenna related to this disclosure.This is a perspective view illustrating an example of a power supply method for a small, broadband antenna related to this disclosure.This is a perspective view illustrating a small, broadband antenna related to this disclosure.This disclosure includes a perspective view illustrating a small, broadband antenna, with a transparent view of the feed plate.This is a plan view illustrating a small, broadband antenna according to this disclosure.This is a cross-sectional view taken along the line segment A1-A2 shown in Figure 2C.This is a schematic diagram illustrating the shape of the slot for the small, wideband antenna described herein.This is a perspective view illustrating an example of a feed plate for a small, broadband antenna relating to this disclosure.This is a perspective view illustrating a small, broadband antenna related to this disclosure.This is a perspective view illustrating a small, broadband antenna related to this disclosure.This graph illustrates the matching characteristics of the small, broadband antenna described herein.This graph illustrates the radiation pattern of the small, broadband antenna described herein. The embodiments of the present invention will be described below with reference to the drawings. In each drawing, the same or corresponding elements are denoted by the same reference numerals, and redundant explanations are omitted where necessary for clarity. [Embodiment 1] <Structure> Figure 1A is a perspective view illustrating a compact, broadband antenna according to this disclosure. Figure 1B is a perspective view illustrating an example of a feeding method for a small, broadband antenna according to this disclosure. In Figures 1A and 1B, the upward direction is defined as the Z direction, and the directions perpendicular to the Z direction are defined as the X and Y directions. The Y direction is also perpendicular to the X direction. The