CN108336477B

CN108336477B - Eight frequency channel cell-phone antennas of three-dimensional structure

Info

Publication number: CN108336477B
Application number: CN201810219828.4A
Authority: CN
Inventors: 王友保; 郑国庆; 肖顺
Original assignee: Nanjing University of Information Science and Technology
Current assignee: Nanjing University of Information Science and Technology
Priority date: 2018-03-16
Filing date: 2018-03-16
Publication date: 2023-07-11
Anticipated expiration: 2038-03-16
Also published as: CN108336477A

Abstract

The invention discloses a three-dimensional eight-frequency band mobile phone antenna, which comprises a dielectric substrate, a metal floor and an antenna structure, wherein the metal floor and the antenna structure are respectively arranged on the dielectric substrate and are positioned on the same side of the dielectric substrate; the antenna structure comprises an L-shaped feed branch, a floor leading-out branch and an annular coupling branch; the L-shaped feed branch is connected with the metal floor through a feed point arranged at the end part of the L-shaped feed branch; the floor leading-out branch comprises a snake-shaped main branch and a first end branch and a second end branch which are branched at the end part of the main branch, the plane of the long branch of the first end branch is vertical to the plane of the main branch, the plane of the short branch is parallel to the plane of the main branch, and the other end of the snake-shaped main branch is a grounding point connected with the metal floor; the annular coupling branch knot is U-shaped, and the U-shaped end part is connected to the snake-shaped main body branch knot. The antenna does not need additional lumped elements, is convenient to produce, has a more compact structure, and is wide in communication frequency band coverage.

Description

Eight frequency channel cell-phone antennas of three-dimensional structure

Technical Field

The invention relates to the field of wireless communication, in particular to a three-dimensional eight-frequency band mobile phone antenna.

Background

Through development of four generations of mobile communication so far, wireless communication is just as a hybrid system combining a plurality of communication systems, which requires that the mobile phone antenna can cover more frequency bands under the condition of meeting the communication standard. However, with the development of mobile terminals, especially mobile phones, there is an increasing trend towards ultra-thin and large screens, which makes the antenna design capable of using smaller and smaller areas. This presents a serious challenge for the design of the mobile phone antenna.

Therefore, miniaturization and multifrequency of the antenna are important design points.

Disclosure of Invention

The invention aims to provide an eight-frequency band mobile phone antenna with a three-dimensional structure.

The above object of the present invention is achieved by the following technical solutions:

the eight-frequency band mobile phone antenna with the three-dimensional structure comprises a medium substrate, a metal floor and an antenna structure, wherein the metal floor and the antenna structure are respectively arranged on the medium substrate and are positioned on the same side of the medium substrate; the antenna structure comprises an L-shaped feed branch, a floor leading-out branch and an annular coupling branch; the L-shaped feed branch is connected with the metal floor through a feed point arranged at the end part of the L-shaped feed branch; the floor leading-out branch comprises a snake-shaped main branch and a first end branch and a second end branch which are branched at the end part of the main branch, the plane of the long branch of the first end branch is vertical to the plane of the main branch, the plane of the short branch is parallel to the plane of the main branch, and the other end of the snake-shaped main branch is a grounding point connected with the metal floor; the annular coupling branch knot is U-shaped, and the U-shaped end part is connected to the snake-shaped main body branch knot.

Further, the metal floor is made of copper.

Further, the antenna structure is made of copper.

Further, the dielectric substrate is an FR4 dielectric substrate.

Further, the size of the dielectric substrate is 135mm×65mm×0.8mm.

Further, the volume of the antenna structure is 32mm×12mm×3mm.

Compared with the prior art, the invention has the following advantages:

first: the antenna system does not need additional lumped elements such as inductance, capacitance, PIN tubes and the like, and is simpler and more convenient to produce and manufacture; second,: the antenna has smaller structure size and more compact structure, and the volume is only 32mm multiplied by 12mm multiplied by 3mm; third,: the antenna can comprehensively cover the LTE700/GSM850/GSM900/DCS1800/PCS1900/UTMS2100/LTE2300/2500 communication frequency bands.

Drawings

FIG. 1 is a schematic diagram of the structure of the present invention;

fig. 2 is a perspective view of an antenna portion of the present invention;

fig. 3 is a plan view of an antenna of the present invention;

fig. 4 is a return loss plot of an antenna of the present invention;

FIG. 5 is a diagram of the XZ and YZ planes of the antenna of the present invention at a frequency of 950 MHz;

FIG. 6 is a diagram of the XZ and YZ planes of the present invention at 1830MHz antenna frequency;

FIG. 7 is a diagram of the XZ and YZ planes of the present invention at 2600MHz antenna frequency;

fig. 8 is a gain and efficiency plot of the antenna of the present invention;

the antenna comprises a 1-dielectric substrate, a 2-metal floor, a 3-antenna structure, a 4-L type feed branch, a 5-floor leading branch, a 6-annular coupling branch, a 7-feed point, an 8-snake-shaped main body branch, a 9-first end branch, a 10-second end branch, a 11-long branch, a 12-short branch and a 13-grounding point.

Detailed Description

The following describes the essential aspects of the invention in detail with reference to the drawings and examples, but is not intended to limit the scope of the invention.

The eight-frequency band mobile phone antenna with the three-dimensional structure shown in the figures 1-3 comprises an FR4 dielectric substrate 1 (135 mm multiplied by 65mm multiplied by 0.8 mm), a metal floor 2 (copper), and an antenna structure 3 (copper, 32mm multiplied by 12mm multiplied by 3 mm), wherein the metal floor 2 and the antenna structure 3 are respectively arranged on the dielectric substrate 1 and are positioned on the same side of the dielectric substrate 1; the antenna structure 3 comprises an L-shaped feed branch 4, a floor extraction branch 5 and an annular coupling branch 6; the L-shaped feed branch 4 is connected with the metal floor 2 through a feed point 7 arranged at the end part of the L-shaped feed branch; the floor leading-out branch 5 comprises a snake-shaped main branch, a first end branch 9 and a second end branch 10 which are branched at the end part of the main branch, wherein the plane of the long branch 11 of the first end branch is vertical to the plane of the main branch, the plane of the short branch 12 of the first end branch is parallel to the plane of the main branch, and the other end of the snake-shaped main branch 8 is a grounding point 13 connected with the metal floor; the annular coupling branch 6 is U-shaped, and the U-shaped end part is connected to the snake-shaped main body branch 8.

The floor and the antenna are arranged on the same side of the dielectric substrate, the branches of the antenna are bent and folded to reduce the overall volume of the antenna, the antenna is folded at C, D points respectively, the effect after folding is shown in fig. 2, the point A is a feed point, and the point B is a grounding point. The wide bandwidth is easy to obtain by coupling and feeding the annular branches through the L-shaped branches. The two branches of the floor leading-out branch joint cover a low frequency band (698 MHz-960 MHz), and the L-shaped branch joint and the floor leading-out branch joint high-order resonance mode cover a high frequency band (1710 MHz-2690 MHz).

Fig. 1 is an overall structure diagram of the present invention, including a dielectric substrate 135mm×65mm×0.8mm (made of FR 4), a metal floor (made of copper) antenna structure (made of copper).

Fig. 2 is a three-dimensional perspective view of an antenna portion, with a volume of 32mm×12mm×3mm.

Fig. 3 is a plan view of an antenna structure and is marked with detailed dimensions in millimeters (a is the feed point, B is the ground point, and C, D is the fold point).

Fig. 4 is the return loss of the antenna (S11), from which it can be seen that the antenna covers sufficiently the LTE700/GSM850/DCS1800PCS1900/UTMS2100/LTE2300/LTE2500 frequency bands.

Fig. 5, 6 and 7 are diagrams of XZ and YZ planes of the antenna at 950MHz, 1830MHz and 2600MHz, respectively. It can be seen from the figure that at low frequency band the antenna has a relatively good omni-directionality, a zero point appears in the pattern of the high frequency band, mainly due to the effect of the floor and the high frequency being a high order resonant mode by the antenna branches.

Fig. 8 shows that the efficiency of the antenna in the design is greater than 60% in both the low frequency band and the high frequency band, so that the requirement is met, and the antenna gain also meets the design requirement.

Compared with the prior art, the invention has the following advantages:

The above-described embodiments serve to describe the substance of the present invention in detail, but those skilled in the art should understand that the scope of the present invention should not be limited to this specific embodiment.

Claims

1. The utility model provides a eight frequency channel cell-phone antennas of three-dimensional structure which characterized in that: the antenna comprises a dielectric substrate, a metal floor and an antenna structure, wherein the metal floor and the antenna structure are respectively arranged on the dielectric substrate and are positioned on the same side of the dielectric substrate; the antenna structure comprises an L-shaped feed branch, a floor leading-out branch and an annular coupling branch; the L-shaped feed branch is connected with the metal floor through a feed point arranged at the end part of the L-shaped feed branch; the floor leading-out branch comprises a snake-shaped main branch and a first end branch and a second end branch which are branched at the end part of the main branch, the plane of the long branch of the first end branch is vertical to the plane of the main branch, the plane of the short branch is parallel to the plane of the main branch, and the other end of the snake-shaped main branch is a grounding point connected with the metal floor; the annular coupling branch is U-shaped, and the U-shaped end part is connected to the branch of the snake-shaped main body; wherein, the metal floor material and the antenna structure material are both copper.

2. The three-dimensional eight-band mobile phone antenna according to claim 1, wherein: the dielectric substrate is an FR4 dielectric substrate.

3. The three-dimensional eight-band mobile phone antenna according to claim 1 or 2, wherein: the size of the dielectric substrate is 135mm by 65mm by 0.8mm.

4. The three-dimensional eight-band mobile phone antenna according to claim 1, wherein: the volume of the antenna structure is 32mm×12mm×3mm.