Antenna device
阅读说明：本技术 天线装置 (Antenna device ) 是由 铃木雄一郎 王珅 伊藤敬义 小曾根彻 佐藤仁 于 2018-02-15 设计创作，主要内容包括：即使在将多个天线元件阵列化的情况下也能够得到更优选的辐射图案。一种天线装置,具备：电介质基板；多个天线元件,沿着第一方向而配设,各自发送或接收极化方向彼此不同的第一无线信号以及第二无线信号；以及接地板,在与彼此相邻的第一以及第二天线元件之间对应的领域,以在第二方向延伸的方式设置有长条状的缝隙,在将无线信号的波长设为λ<Sub>0</Sub>、将电介质基板的相对介电常数设为ε<Sub>r1</Sub>、将相对于接地板位于与电介质基板相反侧的电介质的相对介电常数设为ε<Sub>r2</Sub>的情况下,缝隙在第二方向的长度L满足以下所示的条件式,[数学式1]<Image he="171" wi="700" file="DDA0002363723210000011.GIF" imgContent="drawing" imgFormat="GIF" orientation="portrait" inline="no"></Image>(Even when a plurality of antenna elements are arrayed, a more preferable radiation pattern can be obtained. An antenna device is provided with: a dielectric substrate; a plurality of antenna elements arranged along a first direction, each of which transmits or receives a first radio signal and a second radio signal having different polarization directions; and a ground plate provided with an elongated slot extending in a second direction in a region corresponding to a region between the first and second antenna elements adjacent to each other, the ground plate being configured to have λ as a wavelength of the radio signal 0 Setting the relative dielectric constant of the dielectric substrate to epsilon r1 Will be relative toThe relative dielectric constant of the dielectric with the grounding plate on the side opposite to the dielectric substrate is set as epsilon r2 In the case of (1), the length L of the slit in the second direction satisfies the following conditional expression [ equation 1])
1. An antenna device is provided with:
a substantially planar dielectric substrate;
a plurality of antenna elements that are disposed on one surface of the dielectric substrate along a first direction horizontal to a plane of the dielectric substrate, and that transmit or receive a first radio signal and a second radio signal having different polarization directions from each other; and
a ground plate provided on substantially the entire surface of the other surface of the dielectric substrate, and provided with an elongated slit extending in a second direction orthogonal to the first direction in a region corresponding to a region between the first antenna element and the second antenna element adjacent to each other,
the wavelength of the wireless signal transmitted or received by each of the plurality of antenna elements is set to be lambda0Setting the relative dielectric constant of the dielectric substrate to be epsilonr1And a dielectric body having a relative dielectric constant epsilon with respect to the ground plate and located on the opposite side of the dielectric substrater2In the case of (2), the length L of the slit in the second direction satisfies the following conditional expression,
[ mathematical formula 1]
2. The antenna device of claim 1,
the distance d between the respective centers of the first antenna element and the second antenna element satisfies the following conditional expression,
[ mathematical formula 2]
3. The antenna device of claim 1,
a distance p along the first direction between the center of the first antenna element and the slot satisfies a conditional expression shown below,
[ mathematical formula 3]
4. The antenna device of claim 1,
the polarization direction of the first wireless signal substantially coincides with the first direction,
the polarization direction of the second wireless signal substantially coincides with the second direction,
a first feeding point corresponding to the first wireless signal and a second feeding point corresponding to the second wireless signal are provided for each of the antenna elements.
5. The antenna device of claim 4,
the first feeding point in the second antenna element is eccentrically provided in a direction of an end portion of the second antenna element opposite to the first antenna element among the end portions in the first direction.
6. The antenna device of claim 1,
the antenna element is designed as a planar antenna.
7. The antenna device of claim 1,
the antenna device includes a first antenna unit and a second antenna unit each including the dielectric substrate, the plurality of antenna elements, and the ground plate,
the first antenna unit and the second antenna unit are held at positions where respective normal directions of the first antenna unit and the second antenna unit intersect with each other or the normal directions are twisted with each other with respect to a predetermined housing.
8. The antenna device of claim 7,
the antenna device includes a connection portion that connects an end portion of the first antenna portion extending in the first direction and an end portion of the second antenna portion extending in the first direction.
Technical Field
The present disclosure relates to an antenna device.
Background
In a mobile communication system based on a communication standard called LTE/LTE-a (Advanced: upgraded version), a radio signal of a frequency called ultra high frequency mainly around 700MHz to 3.5GHz is used for communication.
In communication using the ultra-high frequency waves of the communication standard, a technique called MIMO (Multiple-Input and Multiple-Output) is employed, whereby the communication performance can be further improved by using reflected waves for transmission and reception of signals in addition to direct waves even in a fading environment. Since MIMO uses a plurality of antennas, various methods have been studied for providing a terminal device for mobile communication, such as a smartphone, with a plurality of antennas in a more preferable manner.
In recent years, various studies have been made on a fifth-generation (5G) mobile communication system following LTE/LTE-a. For example, in the mobile communication system, use of communication using radio signals of frequencies called millimeter waves (hereinafter also simply referred to as "millimeter waves") such as 28GHz and 39GHz has been studied.
Millimeter waves enable an increase in the amount of information transmitted, on the one hand, compared with ultrahigh frequency waves, and on the other hand, have high rectilinear propagation properties and tend to increase propagation loss and reflection loss. Therefore, it is known that, in wireless communication using millimeter waves, mainly direct waves contribute to communication characteristics, and are hardly affected by reflected waves. Due to such characteristics, in the 5G mobile communication system, introduction of a technique called polarization MIMO, which realizes MIMO using a plurality of polarized waves (for example, horizontal polarized waves and vertical polarized waves) having different polarization directions, has also been studied.
Disclosure of Invention
Problems to be solved by the invention
However, in general, spatial attenuation of millimeter waves is large, and in the case of using millimeter waves for communication, antennas with high gain tend to be required. To fulfill such a requirement, a technique called beam forming is sometimes used. Specifically, the beam width of the antenna can be controlled by beamforming, and the directivity of the beam can be improved, thereby further improving the gain of the antenna. As an example of an antenna system capable of realizing such control, a patch array antenna is given. For example,
On the other hand, when a plurality of antenna elements (for example, patch antennas) are arrayed, the radiation pattern of at least some of the antenna elements may be distorted. As described above, the radiation pattern is distorted, and it may be difficult to obtain a desired gain in at least a partial region in a predetermined space.
In view of the above, the present disclosure proposes an example of a technique that can obtain a more preferable radiation pattern even when a plurality of antenna elements are arrayed.
Means for solving the problems
According to the present disclosure, there is provided an antenna device including: a substantially planar dielectric substrate; a plurality of antenna elements disposed on one surface of the dielectric substrate along a first direction horizontal to a plane of the dielectric substrate, and transmitting or receiving a first wireless signal and a second wireless signal having different polarization directions from each otherNumber; and a ground plate provided on substantially the entire surface of the other surface of the dielectric substrate, wherein an elongated slit is provided in a region corresponding to a region between the first antenna element and the second antenna element adjacent to each other so as to extend in a second direction orthogonal to the first direction, and a wavelength at a center frequency of a resonance frequency of each of the plurality of antenna elements is represented by λ0Setting the relative dielectric constant of the dielectric substrate to be epsilonr1And a dielectric body having a relative dielectric constant epsilon with respect to the ground plate and located on the opposite side of the dielectric substrater2In the case of (2), the length L of the slit in the second direction satisfies the following conditional expression,
[ mathematical formula 1]
Effects of the invention
As described above, according to the present disclosure, a technique is provided that can obtain a more preferable radiation pattern even when a plurality of antenna elements are arrayed.
The above-described effects are not necessarily restrictive, and any of the effects described in the present specification or other effects that can be grasped in the present specification may be achieved together with or in addition to the above-described effects.
Drawings
Fig. 1 is an explanatory diagram for explaining an example of a schematic configuration of a system according to an embodiment of the present disclosure.
Fig. 2 is a block diagram showing an example of the configuration of the terminal device according to this embodiment.
Fig. 3 is an explanatory diagram for explaining an outline of the patch antenna.
Fig. 4 is an explanatory diagram for explaining an example of the configuration of the communication device of the present embodiment.
Fig. 5 is an explanatory diagram for explaining an example of distortion of a radiation pattern which is generated as a plurality of antenna elements are arrayed.
Fig. 6 is an explanatory diagram for explaining an example of distortion of a radiation pattern which is generated as a plurality of antenna elements are arrayed.
Fig. 7 is an explanatory diagram for explaining an example of distortion of a radiation pattern which is generated as a plurality of antenna elements are arrayed.
Fig. 8 is an explanatory diagram for explaining an example of distortion of a radiation pattern which is generated as a plurality of antenna elements are arrayed.
Fig. 9 is an explanatory diagram for explaining a schematic configuration of the antenna device of the present embodiment.
Fig. 10 is a schematic plan view of the antenna device of this embodiment.
Fig. 11 is a schematic a-a' sectional view of the antenna device shown in fig. 10.
Fig. 12 is an explanatory diagram for explaining a radiation pattern of the antenna device of the embodiment.
Fig. 13 is an explanatory diagram for explaining an example of the structure of the antenna device of the present embodiment.
Fig. 14 is a graph showing an example of the relationship between the intervals of the antenna elements and the beam scan angle at which the grating lobes appear in the visible region.
Fig. 15 is an explanatory diagram for explaining an example of the configuration of the antenna device of
Fig. 16 is an explanatory diagram for explaining an example of the structure of the antenna device of
Fig. 17 is an explanatory diagram for explaining an example of the structure of the antenna device of
Fig. 18 is an explanatory diagram for explaining an example of the structure of the antenna element of comparative example 1.
Fig. 19 is an explanatory diagram for explaining an example of the structure of the antenna element of comparative example 1.
Fig. 20 is a diagram showing an example of a simulation result of the radiation pattern of the antenna element of comparative example 1.
Fig. 21 is a diagram showing an example of a simulation result of the radiation pattern of the antenna element of comparative example 1.
Fig. 22 is an explanatory diagram for explaining an example of a schematic configuration of the antenna device of comparative example 2.
Fig. 23 shows an example of a simulation result of the radiation pattern of the antenna device of comparative example 2.
Fig. 24 shows an example of a simulation result of the radiation pattern of the antenna device of comparative example 2.
Fig. 25 is a diagram showing an example of a simulation result of a radiation pattern corresponding to a slot length condition of the antenna device of example 1.
Fig. 26 is a diagram showing an example of a simulation result of a radiation pattern corresponding to a slot length condition of the antenna device of example 1.
Fig. 27 is a diagram showing an example of a simulation result of a radiation pattern corresponding to a slot length condition of the antenna device of
Fig. 28 shows an example of simulation results of the radiation pattern corresponding to the condition of the element spacing in the antenna device of example 1.
Fig. 29 shows an example of simulation results of the radiation pattern corresponding to the condition of the element spacing in the antenna device of example 1.
Fig. 30 shows an example of simulation results of the radiation pattern corresponding to the condition of the element spacing in the antenna device of example 1.
Fig. 31 shows an example of simulation results of the radiation pattern corresponding to the condition of the element spacing in the antenna device of example 1.
Fig. 32 shows an example of simulation results of the radiation pattern corresponding to the condition of the element spacing in the antenna device of example 1.
Fig. 33 is an example of simulation results of the radiation pattern corresponding to the condition of the element spacing in the antenna device of example 1.
Fig. 34 is an explanatory diagram for explaining an application example of the communication device of the embodiment.
Fig. 35 is an explanatory diagram for explaining an application example of the communication device of the embodiment.
Reference numerals
1: a system; 100: a base station; 200: a terminal device; 2001: an antenna section; 2003: a wireless communication unit; 2005: a communication control unit; 2007: a storage unit; 211: a communication device; 2110: an antenna device; 2111: an antenna element; 2112: a component; 2113. 2114: a feed point; 2115: a dielectric substrate; 2116: a ground plate; 2117: a gap.
Detailed Description
Preferred embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. In the present specification and the drawings, the same reference numerals are given to the components having substantially the same functional configuration, and redundant description thereof is omitted.
The following procedure is described.
1. Schematic structure
1.1. Example of System architecture
1.2. Functional structure of terminal device
1.3. Example of the configuration of the terminal device
2. Research on communication using millimeter waves
3. Characteristic of the technology
3.1. Structure of the product
3.2. Modification example