KR101687779B1 - Wide band smart phone antenna using metal cover - Google Patents

Wide band smart phone antenna using metal cover Download PDF

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Publication number
KR101687779B1
KR101687779B1 KR1020150085357A KR20150085357A KR101687779B1 KR 101687779 B1 KR101687779 B1 KR 101687779B1 KR 1020150085357 A KR1020150085357 A KR 1020150085357A KR 20150085357 A KR20150085357 A KR 20150085357A KR 101687779 B1 KR101687779 B1 KR 101687779B1
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South Korea
Prior art keywords
antenna
metal cover
ifa
monopole antenna
substrate
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KR1020150085357A
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Korean (ko)
Inventor
손태호
김병철
박민길
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순천향대학교 산학협력단
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/40—Element having extended radiating surface

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Support Of Aerials (AREA)
  • Details Of Aerials (AREA)

Abstract

The present invention relates to a smartphone broadband antenna using a metal cover, comprising at least one main antenna formed on a substrate and a metal cover connected to the main antenna, the main antenna including a monopole antenna to which power is supplied, And an IFA (Inverted F Antenna) that is hybridized through coupling feeding. According to the present invention, characteristics such as a wide bandwidth, an improved diversity gain, and a radiation efficiency can be improved by hybridizing a monopole antenna and an IFA through a coupling power supply and connecting a metal cover to a monopole antenna.

Description

[0001] Description [0002] WIDE BAND SMART PHONE ANTENNA USING METAL COVER [0003]

The present invention relates to an antenna, and more particularly, to a smartphone broadband antenna using a metal cover having improved characteristics such as bandwidth, gain, and efficiency by using a metal cover of a smart phone.

In recent years, the size of the screen of a smart phone has increased, while the thickness of the screen has become thinner. This is because it considers design competitiveness not only in terms of software and hardware competitiveness, but also in highlighting product differentiation. For example, considering the design aspect, the rear cover is changed from a conventional plastic material to a metal material. However, applying a metal cover to the rear cover is very disadvantageous for antenna operation. That is, if the metal cover surrounds the antenna, the radiation is hindered and the radiation efficiency is lowered. Moreover, the metal cover serves as a ground to lower the antenna impedance and the band characteristic.

Here, the antenna type will be briefly described.

Types of built-in antennas include Plate Inverted F Antenna (PIFA), Inverted F Antenna (IFA), Folded Monopole Antenna (FMA), Dipole, Loop, Slot and Chip Antenna . Although PIFA is widely used because of its high performance, it is difficult to use it as a built-in antenna because of its large volume. That is, if PIFA is applied to a narrow storage space, the radiation efficiency is lowered due to the smaller antenna, and current formation on the antenna is difficult. IFA is mainly applied when an antenna is formed in a narrow storage space. FMA has high gain, but it is very difficult to design because it is affected by EMI paint existing in case of smartphone which is not considered in PCB ground or antenna design. The dipole antenna has a characteristic impedance of about 300 Ω and is applicable to single band and multiband. However, there is a drawback that the basic gain is lower than that of a folded monopole antenna. The built-in antenna of the chip can be implemented with the smallest size. The use of high dielectric constant dielectrics can reduce the size of the antenna and minimize the hand effect. However, it is disadvantageous in that it is more expensive than conventional carriers in cost competitiveness as well as deterioration in efficiency due to dielectric loss. For these reasons, the IFA structure is mostly adopted as a smartphone antenna.

However, applying IFA to a smartphone is substantially undesirable. The reason is that the rear surface is grounded in response to increasingly wider display size. In recent smart phones, the display screen is getting bigger for the user's convenience. Because the display serves as a ground, the antenna built into the smartphone is naturally surrounded by a ground. This type of grounding has a very bad influence on the IFA structure.

On the other hand, unlike conventional voice communication, data communication must reduce data loss due to diversity. This is because the voice does not interfere with the call even if the data is lost or an error occurs, but a large problem occurs in the data. Therefore, in order to solve this problem, MIMO (Multiple Input Multiple Output), which is a technique to transmit signals by installing two or more antennas without using a conventional single SIO (Single Input Single Output) Thereby overcoming the diversity. The basic requirement of a MIMO antenna is to use multiple antennas. However, such a MIMO scheme is advantageous when applied to a single channel of a narrow band. Therefore, when the present invention is applied to a system having broadband characteristics of multiple bands, there is a problem that it is difficult to use the antenna when the space for applying the antenna is narrow.

Korean Registered Patent No. 10-1148366 (Published on May 21, 2012)

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a monopole antenna and an IFA which are hybridized through coupling coupling, and a metal cover is connected to a monopole antenna, And to improve the characteristics such as the efficiency of the antenna.

According to an aspect of the present invention, there is provided a smartphone broadband antenna using a metal cover, including at least one main antenna formed on a substrate, and a metal cover connected to the main antenna.

The main antenna preferably includes a monopole antenna to which power is supplied and an IFA (Inverted F Antenna) that hybridizes with the monopole antenna through coupling power supply.

Preferably, the monopole antenna forms a monopole power feed line through which the metal cover is fed.

It is preferable that the monopole antenna and the IFA have a folded structure.

As described above, according to the smartphone broadband antenna using the metal cover according to the present invention, the monopole antenna and the IFA are hybridized through the coupling power supply, and the metal cover is connected to the monopole antenna, The characteristics such as gain and radiation efficiency can be improved.

1 is a perspective view of a smartphone broadband antenna using a metal cover according to an embodiment of the present invention.
2 is a front view showing a state in which a metal cover is mounted on a substrate.
3 is a front view of the substrate.
4 is a mounting state view of the substrate and the metal cover.
5 is an enlarged view of the main antenna region of the present invention.
6 is a characteristic graph measured with a network analyzer for the antenna of the present invention.
7 is a graph showing the results of envelope correlation coefficients for the antenna of the present invention.
FIG. 8 is a graph showing a result of 3D radiation measured in an anechoic chamber for the antenna of the present invention.

The present invention relates to an antenna to which a MIMO technique to be used in a 4G mobile communication system is applied. More specifically, the present invention relates to a smartphone broadband antenna using a metal cover. In a mobile communication environment, fading, shadow effect, attenuation, noise, and interference are factors that seriously degrade signal reliability. The multipath fading phenomenon leads to serious distortion due to the sum of signals having different phases and sizes received through different paths. A solution to this problem is a MIMO antenna using a plurality of transmitting and receiving antennas. However, in a limited space such as a smart phone, it is difficult to obtain a high degree of isolation because the distance between the antennas is close to that of the MIMO antenna. Recently, we consider the envelope correlation coefficient required for data communication in MIMO antennas. The envelope correlation coefficient is an index that shows the influence of the propagation paths of RF signals reaching each antenna in the MIMO antenna. The range of this coefficient is from 0 to 1, and is determined by a formula using data of S11, S22, and S21. Here, the diversity gain is obtained at the antenna when the envelope correlation coefficient is 0.5, and the closer to 0, the more perfect MIMO performance is obtained.

Hereinafter, a smartphone broadband antenna using the metal cover of the present invention will be described in detail with reference to the accompanying drawings.

First, the same reference numerals will be given to configurations that perform the same function.

FIG. 1 is a perspective view of a smartphone broadband antenna using a metal cover according to an embodiment of the present invention, FIG. 2 is a front view of a state where a metal cover is mounted on a substrate, FIG. 3 is a front view of the substrate, Fig. 5 is an enlarged view of the main antenna region of the present invention. Fig.

1 to 5, a smartphone broadband antenna (hereinafter referred to as "antenna") using a metal cover according to the present invention includes at least one main antenna 2 formed on a substrate 1, 2 connected to the metal cover 3.

In the present embodiment, two main antennas 2 are formed at the opposite positions (long and short axes) of the substrate 1. However, the number of the main antennas 2 is not limited to this, Can also be arbitrarily set.

The metal cover 3 is formed on the entire surface of the substrate 1 where the main antenna 2 is formed. When the metal cover 3 is faced to the entire surface of the substrate 1, Is significantly reduced. 2, the size of the metal cover 3 is adjusted so as not to face the main antenna 2 formed on the substrate 1. In this case, The size of the metal cover 3 will be smaller than that of the substrate 1. [

Here, the opposite position means the upper and lower positions or the right and left positions on one surface, and the plane opposite position means any position on the extension line perpendicular to the plane.

3, the main antenna 2 of the present invention includes a monopole antenna 21 to which power is supplied, an IFA (Inverted F Antenna) to be hybridized with the monopole antenna 21 through coupling feeding, (22).

Here, the monopole antenna 21 is fed through the feed line 4, and the monopole antenna 21 is provided with a monopole feed line 23 to feed the metal cover 3 with electricity.

At this time, the IFA 22 is connected to the ground 5, and the monopole antenna 21 and the IFA 22 are folded.

The monopole antenna 21 and the IFA 22 constituting the main antenna 2 are formed on one surface of the substrate 1 and are preferably formed on the side surface of the substrate 1. [ A plurality of main antennas 2 including the monopole antenna 21 and the IFA 22 may be formed on the substrate 1. [ Preferably, the first main antenna 2 and the second main antenna 2 are formed at opposite positions. In the present embodiment, the first main antenna 2 and the second main antenna 2 are formed at positions opposed to the upper and lower sides of the substrate 1, respectively.

In addition, the metal cover 3 is mounted at a position facing the surface of the substrate 1 on which the main antenna 2 is formed.

On the other hand, the IFA 22 is preferably formed at the outermost side of the side surface, and the IFA 22 is connected to the ground 5 formed on one surface of the substrate 1. [ Further, the IFA 22 may be connected to the ground 5 formed on the rear surface of the substrate 1. [ In this case, it is preferable that the IFA 22 is formed so as not to be surrounded by the ground 5 formed on one surface or the rear surface of the substrate 1. That is, the ground 5 should not be formed at the face-opposing position of the IFA 22.

4, the substrate 1 and the metal cover 3 are separated by the connector 6, and the main antenna 2 (monopole antenna) and the metal cover 3 are connected by the connector 6 . The spacing distance is preferably set corresponding to the thickness of the smart phone or the mounting position of the metal cover 3. [ Therefore, the length of the connector 6 can be set within a range of 1 to 10 mm, preferably within a range of 4 to 6 mm. The connector 6 may be integrally formed on the metal cover 3 or integrally formed on the feed line 4 of the monopole antenna 21 or may be formed separately so that the main antenna 2 and the metal cover 3 are integrally formed. As shown in FIG. As another example, it is possible to form a two-layer structure by maintaining a hollow state (material: air layer) without forming a circuit element for a smart phone between the substrate 1 and the metal cover 3.

5, the monopole antenna 21 and the IFA 22 have a folded structure. The monopole antenna 21 and the IFA 22 are configured to be coupled in the "C" region, and the IFA 22 Is grounded to the ground 5 formed on one surface of the substrate 1. [ At this time, the interval between the monopole antenna 21 and the IFA 22 for coupling may be set to 0.1 to 0.9 [mm], preferably to be set to 0.3 to 0.5 [mm]. The monopole antenna 21 is provided with a mono feed line 23 and the connector 6 of the metal cover 3 is connected to the extended line P of the mono feed line 23.

As described above, in the antenna of the present invention, the monopole antenna 21 and the IFA 22 have a hybrid structure by feeding coupling, and the monopole antenna 21 and the metal cover 3 are connected. Accordingly, the antenna of the present invention is largely divided into a part for operating the monopole antenna 21 in the feed line 4 and a monopole feed line 23 for operating the metal cover 3. The size of the metal cover 3 is smaller than the size of the substrate 1 and the monopole antenna 21 and the IFA 22 are connected to the ground 5 in order to prevent the gain and the characteristic efficiency of the antenna from being reduced. It is possible to improve the radiation efficiency by not facing the surface. Meanwhile, for the MIMO operation, power is supplied to the first main antenna 2 and the second main antenna 2, respectively. A wide bandwidth can be ensured through the coupling between the monopole antenna 21 and the IFA 22. The IFA 22 is connected to the short stub and the open stub at the same time, .

6 is a characteristic graph measured with a network analyzer for the antenna of the present invention.

Referring to FIG. 6, the VSWR in the LTE class 13 (746 to 787 MHz), LTE class 14 (758 to 798 MHz), CDMA (824 to 894 MHz) and GSM (890 to 960 MHz) (VSWR) of 3: 1 or less in DCS (1710 to 1880 MHz), PCS (1850 to 1990 MHz), WCDMA (1920 to 2170 MHz), LTE class 40 (2300 to 2400 MHz), and WiFi Respectively. In particular, better characteristics and wider bandwidth results than VSWR 6: 1 in the existing antenna LTE class 13 (746 to 787 MHz), LTE class 14 (758 to 798 MHz), CDMA (824 to 894 MHz) and GSM Respectively.

7 is a graph showing the results of envelope correlation coefficients for the antenna of the present invention.

Referring to FIG. 7, a good envelope correlation coefficient result for data communication is shown by showing characteristics below 0.2 in all bands including the data communication band. Here, the envelope correlation coefficient is a value calculated after extracting data with a network analyzer.

FIG. 8 is a graph showing a result of 3D radiation measured in an anechoic chamber for the antenna of the present invention.

Referring to FIG. 8, in the antenna according to the present invention, omnidirectional characteristics that require communication in all attitudes are required. As shown in the figure, omni-directional characteristics are shown from low band to high band.

The radiation characteristics measured in the anechoic chamber for the antenna of the present invention are shown in Table 1 below.

Figure 112015058202401-pat00001

As shown in Table 1, the efficiency and the average gain are in the range of 30.87 to 74.48% and -5.14 to -1.28 dBi in the low frequency band (746 to 960 MHz), and the efficiency and the average gain in the high band (1710 to 2500 MHz) Of 51.15 to 74.18% and -2.91 to 1.56 dBi, respectively. Especially, in the low frequency band (746 ~ 960MHz) of the conventional antenna, the efficiency is better than 12.77 ~ 38.46%.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.

1: substrate
2: main antenna
3: Metal cover

Claims (4)

A monopole antenna formed on the substrate,
An IFA (Inverted F Antenna) formed to be connected to the ground on the substrate and feeding the coupling to the monopole antenna,
A metal cover disposed on the substrate so as to be spaced apart from the monopole antenna and the IFA,
A connector which is located between the metal cover and the monopole antenna and connects the metal cover and the monopole antenna,
A feed line connected to the monopole antenna on the substrate and feeding the monopole antenna,
And a monopole antenna that is connected to the monopole antenna and the connector and is formed in parallel with the monopole antenna,
/ RTI >
The length of the connector is between 4 mm and 6 mm
Smartphone broadband antenna using metal cover. delete delete The method according to claim 1,
The monopole antenna and the IFA are smartphone broadband antennas using a metal cover having a folded structure.
KR1020150085357A 2015-06-16 2015-06-16 Wide band smart phone antenna using metal cover KR101687779B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102117274B1 (en) * 2019-05-28 2020-06-01 주식회사 이엠따블유 Monopole anttena and anttena module having the same
KR102140256B1 (en) * 2019-05-28 2020-07-31 주식회사 이엠따블유 Anttena module and vehicle having the same
US11553068B2 (en) 2018-01-15 2023-01-10 Samsung Electronics Co., Ltd. Contact structure and electronic device including same

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080096241A (en) * 2007-04-27 2008-10-30 삼성전자주식회사 Portable communication terminal and inner antenna structure thereof
KR101148366B1 (en) 2010-11-23 2012-05-21 순천향대학교 산학협력단 Antenna for mobile communication terminals

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080096241A (en) * 2007-04-27 2008-10-30 삼성전자주식회사 Portable communication terminal and inner antenna structure thereof
KR101148366B1 (en) 2010-11-23 2012-05-21 순천향대학교 산학협력단 Antenna for mobile communication terminals

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
"MIMO Antenna by Subslot", The Journal of korean institute of electromagnetic engineering and science, 2015, Mar., 248-256 (March, 2015) *
이원희 외 2명, "보조 슬롯에 의한 메탈 폰 MIMO 안테나", The Journal of korean institute of electromagnetic engineering and science, 2015, Mar., 248-256 (2015년 3월)*

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11553068B2 (en) 2018-01-15 2023-01-10 Samsung Electronics Co., Ltd. Contact structure and electronic device including same
KR102117274B1 (en) * 2019-05-28 2020-06-01 주식회사 이엠따블유 Monopole anttena and anttena module having the same
KR102140256B1 (en) * 2019-05-28 2020-07-31 주식회사 이엠따블유 Anttena module and vehicle having the same
WO2020242099A1 (en) * 2019-05-28 2020-12-03 주식회사 이엠따블유 Antenna module and vehicle comprising same

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