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JP-7855950-B2 - Antenna equipment

JP7855950B2JP 7855950 B2JP7855950 B2JP 7855950B2JP-7855950-B2

Inventors

  • 熊谷 翔
  • 吉田 翔
  • 岩上 健一

Assignees

  • ＡＧＣ株式会社

Dates

Publication Date
20260511
Application Date
20220704

Claims (11)

  1. A reflector having a reflector, An antenna device having an EBG (Electromagnetic Band Gap) structure, comprising a partial reflector provided opposite to the reflector of the reflector and transmitting radio waves little by little, and a primary radiator that radiates radio waves into the space between the reflector and the partial reflector, The reflector is positioned on at least a portion of the end of the reflector and further has an inclined portion that is inclined with respect to the reflector and extends toward the partial reflector, An antenna device in which the height of the upper end of the inclined portion relative to the reflector is at least half the height of the partial reflector relative to the reflector.
  2. The antenna device according to claim 1, wherein the inclined portion is provided on at least two opposing sides of the outer edge of the reflector in a plan view.
  3. The antenna device according to claim 1, wherein the inclination angle of the inclined portion with respect to the reflector is within the range of 30 to 60 degrees.
  4. The primary radiator is a slot antenna, The antenna device according to claim 1, wherein the inclined portion is located on the extension of the short side of the slot antenna, which is part of the end of the reflector.
  5. The reflector has an opening, The antenna device according to claim 1, wherein the primary radiator radiates radio waves through the opening into the space between the reflector and the partial reflector.
  6. The antenna device according to claim 1, wherein the upper end of the inclined portion extends to the partial reflector.
  7. The distance in a plan view between the position in the direction connecting the inclined portion and the primary radiator at the point where the height of the inclined surface of the inclined portion reaches a predetermined height, and the center of the radiating portion of the primary radiator, is (n+1/4)λ±λ/8 (where n is an integer of 1 or more), where λ is the wavelength of the radio wave. The antenna device according to any one of claims 1 to 6, wherein the predetermined height is half the height of the partial reflector relative to the reflector.
  8. The aforementioned partial reflector has a first FSS (Frequency Selective Surface) structure which is positioned to overlap with the reflector in a plan view, The antenna device according to claim 1, wherein the first FSS structure has a rectangular shape with sides of 0.7λ or more in a plan view, where λ is the wavelength of the radio wave.
  9. The antenna device according to claim 8, wherein the outer edge of the first FSS structure and the inclined portion overlap in a plan view.
  10. The aforementioned partial reflector has a dielectric material provided within the region that overlaps with the inclined portion in a plan view. The antenna device according to claim 1, wherein the thickness t of the dielectric is represented by the following formula (1). Here, n is an integer greater than or equal to 1, λ is the wavelength of the radio wave, εr is the relative permittivity of the dielectric at wavelength λ, dx is the distance in a plan view between the position in the direction connecting the inclined portion and the primary radiator at the point where the height of the inclined surface of the inclined portion becomes a predetermined height, and the center of the radiating portion of the primary radiator, wherein the predetermined height is half the height of the partial reflector relative to the reflector.
  11. The antenna device according to claim 1, wherein the partial reflector has a second FSS (Frequency Selective Surface) structure positioned to overlap with the inclined portion in a plan view.

Description

This disclosure relates to an antenna device. Conventionally, there are microwave antennas that include a main reflector for radiating microwaves, and a support substrate placed at the opening of the main reflector, on which a sub-reflection pattern consisting of multiple metal bodies is formed. In this sub-reflection pattern, the metal bodies in the central part in the magnetic field direction are arranged with a predetermined first gap, while the metal bodies outside of these central metal bodies are arranged with a second gap smaller than the first gap. A sloping section is provided between the bottom surface and the inner surface of the main reflector (see, for example, Patent Document 1). Japanese Patent Publication No. 2012-147158 This is a perspective view showing an example of the configuration of the antenna device according to the embodiment.This is a plan view showing an example of the configuration of an antenna device.This figure shows an example of the configuration of the cross-section viewed along the line A-A in Figures 1 and 2.This is a perspective view showing an example of the configuration of a partial reflector.This figure shows an example of the configuration of the lower surface of a partial reflector.This figure shows an example of the EBG mode and propagation mode.This figure shows an example of the position of an inclined surface.This figure shows an example of the simulation results for the frequency characteristics of the maximum gain of an antenna device.This figure shows an example of simulation results for the directivity of an antenna device.This figure shows an example of simulation results for the directivity of an antenna device.This figure shows an example of the simulation results of the maximum gain frequency characteristics of a comparative antenna device.This figure shows an example of simulation results for the directivity of a comparative antenna device.This figure shows an example of simulation results for the directivity of a comparative antenna device.This figure shows an example of the cross-sectional structure of an antenna device according to the first modified embodiment.This figure shows an example of the cross-sectional structure of an antenna device according to a second modified embodiment.This figure shows an example of a planar structure of an antenna device according to a third modified embodiment.This figure shows an example of a planar structure of an antenna device according to a fourth modified embodiment.This figure shows an example of the configuration of the cross-section viewed along the line B-B in Figure 15.This figure shows an example of the electric field distribution of radio waves in EBG mode and propagation mode.This figure shows an example of the simulation results of the frequency characteristics of the maximum gain of the antenna device in the fourth modified embodiment.This figure shows an example of the simulation results for the directivity of the antenna device of the fourth modified embodiment.This figure shows an example of the simulation results for the directivity of the antenna device of the fourth modified embodiment.This figure shows an example of a planar structure of an antenna device according to a fifth modified embodiment.This figure shows an example of the configuration of the cross-section viewed along the line C-C in Figure 20.This figure shows an example of a cell.This figure shows an example of a cell. The following describes embodiments applying the antenna device of this disclosure. In the following, the same number may be used for the same element, and redundant descriptions may be omitted. The following explanation defines and describes the XYZ coordinate system. The directions parallel to the X-axis (X direction), the directions parallel to the Y-axis (Y direction), and the directions parallel to the Z-axis (Z direction) are mutually orthogonal. Furthermore, for convenience of explanation, the -Z direction may be referred to as the lower side or bottom, and the +Z direction as the upper side or top. Also, "plan view" refers to viewing from the XY plane. Additionally, the lengths, widths, thicknesses, etc., of various parts may be exaggerated in the following explanation to make the configuration easier to understand. Furthermore, terms such as parallel, right angles, orthogonal, horizontal, vertical, and up and down should be used with a degree of deviation that does not impair the effect of the embodiment. Furthermore, in the following explanation, "radio waves" refer to a type of electromagnetic wave, and generally, electromagnetic waves below 3 THz are called radio waves. Below, electromagnetic waves radiated from outdoor base stations or relay stations will be referred to as "radio waves," while electromagnetic waves in general will be referred to as "electromagnetic waves." Also, below, when referring to "millimeter waves" or the "millimeter wave band," it will include the 24 GHz to 30 GHz quasi-millime