WO2016045436A1

WO2016045436A1 - Wide frequency band 4g wireless terminal antenna

Info

Publication number: WO2016045436A1
Application number: PCT/CN2015/084348
Authority: WO
Inventors: 程孝奇
Original assignee: 中兴通讯股份有限公司
Priority date: 2014-09-24
Filing date: 2015-07-17
Publication date: 2016-03-31
Also published as: CN105449349A

Abstract

A wide frequency band 4G wireless terminal antenna comprises: a feeding branch radiation unit (3) on a main board PCB (1) for generating high frequency resonance; and a parasitic short-circuit branch radiation unit (4) surrounding the outside of the feeding branch radiation unit (3) for generating low frequency resonance.

Description

Wideband 4G wireless terminal antenna

Technical field

This paper relates to the field of wireless terminal antenna design, and more particularly to a wideband 4G wireless terminal antenna.

Background technique

With the rapid development of wireless communication technologies, the frequency bands used by wireless terminals are increasing. In order to meet the more business needs of users, 2G, 3G, LTE (Long Term Evolution), etc. exist in the current mobile communication terminal networks. Multi-standard, which requires the wireless terminal antenna to cover 2G frequency band, 3G network frequency band and LTE frequency band at the same time. Since the bandwidth required by the LTE band is very wide (698-960 MHz, 1710-2690 MHz), new requirements are placed on the antenna design of the 4G wireless terminal.

On the other hand, wireless terminals have begun to develop in a thin and light direction, especially the currently favored 4G mobile phones, so that the space reserved for the design of mobile phone antennas is getting smaller and smaller, and the environment is becoming more and more complicated. Under the conventional antenna design, it is difficult to meet the requirements of 4G mobile phones.

Summary of the invention

Embodiments of the present invention provide a wideband 4G wireless terminal antenna to achieve wideband under conditions of limited design space.

The embodiment of the invention provides a broadband 4G wireless terminal antenna, and the antenna includes:

a feed branch radiating unit (3) on the main board PCB (1) that generates high frequency resonance;

A parasitic short-circuit branch radiating unit (4) that surrounds the feed branch unit (3) and generates low-frequency resonance.

Optionally,

The feed point branch radiating unit (3) is connected to an antenna RF signal feeding point on the main board PCB (1);

The parasitic short-circuit branch radiating unit (4) is connected to the metal ground of the main board PCB (1).

Optionally,

The feed branch radiating unit (3) and the parasitic short-circuit branch radiating unit (4) are in an open loop shape, and the opening of the feeding branch radiating unit (3) and the opening direction of the parasitic short-circuit branch radiating unit (4) the same.

Optionally,

The length of the parasitic short-circuit branch radiating unit (4) is calculated according to the fundamental frequency generated by the parasitic short-circuit radiating unit (4), and the length of the feeding branch radiating unit (3) is according to the feeding The fundamental frequency generated by the electric branch radiating unit (3) is calculated, and the length of the parasitic short-circuit radiating unit (4) is greater than the length of the feeding branch radiating unit (3).

Optionally,

The width of the first slit (6) between the feeding branch radiating unit (3) and the parasitic short-circuit radiating unit (4) from the feeding point of the antenna radio frequency signal can be adjusted;

The size of the width of the second slit (7) between the feed branch radiating unit (3) and the parasitic short-circuit branch radiating unit (4) can be adjusted.

Optionally,

The first slit (6) between the feed branch radiating unit (3) and the parasitic short-circuit radiating unit (4) has a width of 0.4 mm, and the feeding branch radiating unit (3) and the parasitic short-circuit branch The width of the second slit (7) between the radiating elements (4) is 0.8 mm.

The above technical solution realizes coupling of multiple harmonic modes by the position layout of the feeding branch unit and the parasitic shorting unit, thereby broadening the frequency bandwidth and satisfying the 4G multi-band use requirement of the wireless terminal. Moreover, in the above technical solution, since only the two units of the feed branch unit and the parasitic short unit are used, the structure is simple and the space is small, and can be widely adapted to an ultra-thin 4G wireless terminal.

BRIEF abstract

1 is a structural diagram of a broadband 4G wireless terminal antenna according to an embodiment of the present invention;

Figure 2 is a partial enlarged view of the antenna of Figure 1;

FIG. 3 is a simulation diagram of return loss of a wireless terminal antenna according to an embodiment of the present invention.

Embodiments of the invention

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, in the case of no conflict, the features in the embodiments and the embodiments in the present application may be arbitrarily combined with each other.

1 is a structural diagram of a wideband 4G wireless terminal antenna according to an embodiment of the present invention.

In Figure 1, 1 is the mobile phone motherboard PCB, 2 is the motherboard PCB ground, 3, 4 are the antenna radiating elements on the motherboard PCB surface, 3 is the feeding branch radiating unit, 4 is the parasitic short-circuit branch radiating unit.

The feeding branch radiating unit 3 and the parasitic short-circuit radiating unit 4 can be attached to the main board PCB surface through an FPC (flexible circuit board), and the other side of the main board PCB is the main board clearing area 5, since the radiating antenna is located on the main board PCB surface. On the other hand, setting a clearance area on the other side of the motherboard PCB can ensure the bandwidth of the antenna. The feeding branch radiating unit 3 is responsible for generating high frequency resonance, and resonance can occur at 960, 2250 and 2600 MHz; the parasitic shorting branch radiating unit 4 surrounding the feeding branch unit 3 is responsible for generating low frequency resonance, which can be Resonance occurs at 700MHz, 1700MHz, and 2710MHz.

The length of the parasitic short-circuit branch radiating unit 4 is calculated according to the fundamental frequency generated by the parasitic short-circuit radiating unit (4), and the length of the feeding branch radiating unit 3 is radiated according to the feeding branch Calculating the fundamental frequency generated by the unit (3), the length of the parasitic short-circuit branch radiating unit 4 and the length of the feeding branch radiating unit 3 are both close to a quarter wavelength of 800 MHz, wherein the parasitic short-circuit branch The length of the radiating element 4 is greater than the length of the feed branch radiating element 3.

2 is a partial enlarged view of the antenna of FIG. 1.

The feed point branch radiating unit 3 is connected to the antenna RF signal feeding point 11 on the main board PCB, and the feed point branch radiating unit 3 can be connected to the antenna RF signal feeding point 11 through the first foot 8; The parasitic short-circuit branch radiating unit 4 is connected to the metal ground of the PCB through a short-circuit point 10 disposed on the surface of the main board PCB, and the parasitic short-circuit branch radiating unit 4 can be connected to the short-circuit point 10 through the second leg 9.

The feeding branch radiating unit 3 and the parasitic short-branch radiating unit 4 are in an open ring shape, and the opening of the feeding branch radiating unit 3 and the opening direction of the parasitic short-circuit branch radiating unit 4 are the same, so that the design not only realizes the feeding The tight coupling of the electric branch radiating unit 3 and the parasitic short-circuit branch radiating unit 4 also saves design space.

The width of the first slot 6 between the feeding branch radiating unit 3 and the parasitic short-circuit radiating unit 4 from the feeding point of the antenna radio frequency signal is adjustable, and the feeding branch radiating unit 3 and The size of the width of the second slit 7 between the parasitic short-circuit branch radiating elements 4 can also be adjusted. By appropriately adjusting the sizes of the first slit 6 and the second slit 7, the three resonance modes of the feed branch radiating unit 3 and the parasitic short-circuit branch radiating unit 4 can be correspondingly coupled to each other, thereby widening the antenna band, wherein Adjusting the width of the first slit 6 can adjust the bandwidth and resonance of the high frequency, and adjusting the width of the second slit 7 can adjust the bandwidth and resonance of the high and low frequencies. According to the actual debugging experience, when the width of the first slit 6 is 0.4 mm and the width of the second slit 7 is 0.8 mm, the 4G multi-band use requirement of the wireless terminal can be satisfied.

Alternatively, the lengths of the feed branch radiating unit 3 and the parasitic short stub radiating unit 4 may be appropriately adjusted for the needs of more frequency bands.

FIG. 3 is a graph showing a return loss simulation curve of a wireless terminal antenna according to an embodiment of the present invention. In the figure, S11 refers to the return loss of the antenna. It can be seen from the figure that the antenna has two resonant frequency bands, which can cover the entire LTE working frequency band (698-960MHz, 1710-2690MHz) well, and the return loss of the two-pass band is less than -5dB, which satisfies the mobile communication. Technical requirements for 4G mobile phone antennas.

One of ordinary skill in the art will appreciate that all or a portion of the steps described above can be accomplished by a program that instructs the associated hardware, such as a read-only memory, a magnetic or optical disk, and the like. Optionally, all or part of the steps of the foregoing embodiments may also be implemented by using one or more integrated circuits. Accordingly, each module/unit in the foregoing embodiment may be implemented in the form of hardware, or may be implemented by using a software function module. Formal realization. The invention is not limited to any specific form of combination of hardware and software.

Industrial applicability

Claims

A wideband 4G wireless terminal antenna, the antenna comprising:

a feed branch radiating unit (3) on the main board PCB (1) that generates high frequency resonance;

A parasitic short-circuit branch radiating unit (4) that surrounds the feed branch unit (3) and generates low-frequency resonance.
The antenna according to claim 1, wherein

The feed point branch radiating unit (3) is connected to an antenna RF signal feeding point on the main board PCB (1);

The parasitic short-circuit branch radiating unit (4) is connected to the metal ground of the main board PCB (1).
The antenna according to claim 2, wherein

The feed branch radiating unit (3) and the parasitic short-circuit branch radiating unit (4) are in an open loop shape, and the opening of the feeding branch radiating unit (3) and the opening direction of the parasitic short-circuit branch radiating unit (4) the same.
The antenna according to claim 3, wherein

The length of the parasitic short-circuit branch radiating unit (4) is calculated according to the fundamental frequency generated by the parasitic short-circuit radiating unit (4), and the length of the feeding branch radiating unit (3) is according to the feeding The fundamental frequency generated by the electric branch radiating unit (3) is calculated, and the length of the parasitic short-circuit radiating unit (4) is greater than the length of the feeding branch radiating unit (3).
The antenna according to claim 3, wherein

The width of the first slit (6) between the feeding branch radiating unit (3) and the parasitic short-circuit radiating unit (4) from the feeding point of the antenna radio frequency signal can be adjusted;

The size of the width of the second slit (7) between the feed branch radiating unit (3) and the parasitic short-circuit branch radiating unit (4) can be adjusted.
The antenna according to claim 5, wherein

The first slit (6) between the feed branch radiating unit (3) and the parasitic short-circuit radiating unit (4) has a width of 0.4 mm, and the feeding branch radiating unit (3) and the parasitic short-circuit branch The width of the second slit (7) between the radiating elements (4) is 0.8 mm.