Antenna and combination antenna
AssigneesFurukawa Electric Co., Ltd., Furukawa Automotive Systems Inc.
InventorsNobutake Orime, Naotaka Uchino, Daisuke Inoue, Yoichi Iso
Life of this patent
Estimating the term…
Abstract
Provided are an antenna and a combination antenna having a wide directivity in a predetermined plane direction. The antenna 100 is configured to have rims 111, 112 at left and right ends of a dielectric substrate 101 in the X direction in such a manner as to sandwich antenna elements 10. The rims 111, 112 may be metal plates or EBGs. As the rims 111, 112 are thus provided at both sides to sandwich the antenna elements 10, it is possible to reduce the width of the dielectric substrate 101 of the antenna 100 required for realizing wide coverage. As a result, it is possible to create a greater space for integration of another RF circuit and improve the space factor.
Claims9
An antenna comprising:
- a dielectric substrate;
- a plurality of antenna elements provided on the dielectric substrate and having magnetic current as a main radiating source, the plurality of antenna elements arranged such that an Eθ component as main polarized waves is placed in a horizontal direction;
- and
- rims made of metal plates or EBGs (Electromagnetic band Gap) with a predetermined periodic structure provided at respective sides on the dielectric substrate in such a manner as to sandwich the at least one antenna element in the horizontal direction, wherein
- the plurality of at least one antenna elements comprise two or more groups of antenna elements arranged in a vertical direction, each of the groups of the antenna elements having two antenna elements arranged in a horizontal direction, and each of the antenna elements being formed as a ¼ wavelength rectangular patch, and
- when a distance between the rims or EBGs arranged at the respective sides of the two or more groups of the antenna elements is Asub, free space wavelength of radiation wave of the antenna elements is λ0, a relative effective permittivity of the dielectric substrate is ∈eff, and a length a of each of the antenna elements in the horizontal direction meets
- a
- =
- 1
- 4
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- λ
-
-
- O
- ɛ
-
-
- eff
- the Asub is determined to meet
- 0.95−2a/λ0<Asub/λ0<1.3−2a/λ0.
A combination antenna comprising:
- a dielectric substrate;
- a transmission antenna having a plurality of antenna elements vertically arranged on the dielectric substrate in such a manner that a main radiating source is magnetic current and an Eθ component as main polarized waves is placed in a horizontal direction;
- a receiving antenna having two or more groups of the antenna elements vertically arranged on the dielectric substrate, each of the groups having two antenna elements arranged in the horizontal direction;
- a center EBG arranged between the transmission antenna and the receiving antenna;
- other EBGs arranged between respective end surfaces of the dielectric substrate in the horizontal direction and the center EBG to be symmetric with respect to the transmission antenna and the receiving antenna;
- and
- rims arranged between the respective end surfaces and the other EBGs and between the center EBG and the other EBGs.
A combination antenna comprising:
- a dielectric substrate;
- a transmission antenna having a plurality of antenna elements vertically arranged on the dielectric substrate in such a manner that a main radiating source is magnetic current and an Eθ component as main polarized waves is placed in a horizontal direction;
- a receiving antenna having two or more groups of the antenna elements vertically arranged on the dielectric substrate, each of the groups having two antenna elements arranged in the horizontal direction;
- end-surface rims arranged at both end surfaces of the dielectric substrate in the horizontal direction;
- a center EBG arranged between the transmission antenna and the receiving antenna;
- another rim arranged between the transmission antenna and the center EBG;
- and
- an yet other rim arranged between the receiving antenna and the center EBG,
- wherein one of the end-surface rims, the transmission antenna, the other rim, the center EBG, the yet other rim, the receiving antenna and the other of the end-surface rims are arranged in the horizontal direction.
Dependencies are inferred from the claim text.