ANTENNA

• US 20150325923A1
• Filed: 11/14/2013
• Published: 11/12/2015
• Est. Priority Date: 11/29/2012
• Status: Abandoned Application

• Current Assignee: Nihon Dengyo Kosaku Co., Ltd.
• Original Assignee: Nihon Dengyo Kosaku Co., Ltd.
• Inventors: HIRAMATSU, Hidenobu
• Application Number:
  US14/442,006
• Publication Number:
  US 20150325923A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H01Q 1/38 formed by a conductive layer on an insulating support patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface H01Q15/142
• CPC Class Codes: H01Q 15/006 Selective devices having photonic band gap materials or materials of which the material properties are frequency dependent, e.g. perforated substrates, high-impedance surfaces
• CPC Class Codes: H01Q 15/0086 said selective devices having materials with a synthesized negative refractive index, e.g. metamaterials or left-handed materials
• CPC Class Codes: H01Q 15/22 functioning also as polarisation filter
• CPC Class Codes: H01Q 19/108 Combination of a dipole with a plane reflecting surface H01Q19/106 takes precedence; strip line H01Q9/065
• CPC Class Codes: H01Q 21/24 Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction circularly polarised patch antennas H01Q9/0428; circularly polarised horns H01Q13/0241; cross-polarised horns H01Q13/0258; polarisation converters H01Q15/242; cross-polarised rear feeds H01Q19/136; crossed polarisation dual antenna H01Q25/001
• CPC Class Codes: H01Q 5/378 Combination of fed elements with parasitic elements
• CPC Class Codes: H01Q 9/16 with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole H01Q9/44 takes precedence

Abstract

The antenna is provided with: a conductor; an EBG structure that is disposed above the conductor and that contains plural square elements arranged in a matrix; and a radiation element disposed above the EBG structure. A distance L1 between the conductor and the EBG structure satisfies 0.01λ₀≦L1≦0.15λ₀, preferably satisfies 0.025λ₀≦L1≦0.085λ₀, and more preferably satisfies 0.035λ₀≦L1≦0.07λ₀, where an wavelength of a design center frequency of the radiation element is denoted by λ₀.

Claims

1. An antenna comprising:

a conductor;

an EBG structure that is disposed over the conductor with air space there between and contains a plurality of square elements arranged in a matrix; and

a radiation element disposed above the EBG structure, wherein

distance L1 between the conductor and the EBG structure satisfies 0.01λ

₀≦

L1≦

0.15λ

₀, where an wavelength of a design center frequency of the radiation element is denoted by λ

₀, and

each of the plurality of square elements in the EBG structure galvanically isolated from both the conductor and the others of the plurality of square elements.

2. The antenna according to claim 1, wherein

the radiation element comprises:

one pair of dipole elements transmitting and receiving one linearly polarized wave, the dipole elements being arranged in parallel; and

another pair of dipole elements transmitting and receiving another linearly polarized wave orthogonal to the one linearly polarized wave, the dipole elements of the another pair being disposed in parallel, wherein

the one pair of the dipole elements and the another pair of the dipole elements are disposed so that a line connecting centers of the dipole elements of the one pair intersects with a line connecting centers of the dipole elements of the another pair.

3. The antenna according to claim 1, wherein

the distance L1 between the conductor and the EBG structure satisfies 0.025λ

₀≦

L1≦

0.085λ

₀.

4. The antenna according to claim 3, wherein

the distance L1 between the conductor and the EBG structure satisfies 0.035λ

₀≦

L1≦

0.07λ

₀.

5. The antenna according to claim 1, wherein

a square element located in a section corresponding to the radiation element has been removed from the EBG structure.

6. The antenna according to claim 1, wherein

the radiation element comprises a parasitic element.