CN213425182U

CN213425182U - PIFA antenna and mobile phone

Info

Publication number: CN213425182U
Application number: CN202022363882.1U
Authority: CN
Inventors: 刘学
Original assignee: Shenzhen Zhuorui Communication Technology Co ltd
Current assignee: Shenzhen Zhuorui Communication Technology Co ltd
Priority date: 2020-10-22
Filing date: 2020-10-22
Publication date: 2021-06-11
Anticipated expiration: 2030-10-22

Abstract

The application relates to a PIFA antenna, PIFA antenna includes irradiator and mainboard, the plane at irradiator place with the plane at mainboard place is parallel to each other, the mainboard has one and cracks, the irradiator surface with crack and align to set up with ground. The utility model has the advantages that: the utility model discloses PIFA antenna and cell-phone, PIFA antenna have synthesized traditional antenna form design advantage, and through slotting with being provided with, improve the radiation efficiency of antenna radiator, have high efficiency, high gain, high bandwidth, penetrating power are strong, throughput is big, receive characteristics such as the interference of components and parts is less and have stronger hardness on every side, are applicable to the cell-phone, miniaturized product antenna design, and the antenna body is less, and radiation performance obtains improving.

Description

PIFA antenna and mobile phone

Technical Field

The application belongs to the technical field of antennas, and particularly relates to a PIFA antenna and a mobile phone.

Background

The mobile phone antenna is equipment used for receiving signals on the mobile phone, the old mobile phone has an outward convex antenna, and most of the new mobile phones are hidden in the mobile phone body. The antenna is mainly arranged in the mobile phone, and the inside of the mobile phone cannot be seen in appearance. The mobile phone antenna is a standing wave antenna, if the impedance of the antenna is not matched with the band of the antenna to be received and transmitted, a large amount of signals are reflected, the radiation efficiency of the antenna is reduced, and meanwhile, the gain of the antenna in a wide frequency band is jittered due to the influence of reflection.

The radio frequency signal power output by the radio transmitter is transmitted to the antenna through a feeder (cable) and radiated out by the antenna in the form of electromagnetic waves. After reaching the receiving location, the electromagnetic waves are carried by the antenna and then to the radio receiver by the feeder. It can be seen that an antenna is an important radio device for transmitting and receiving electromagnetic waves, and that there is no antenna and no radio communication.

At present, the mobile phone antenna mainly comprises an internal antenna and an external antenna, and the internal antenna is objectively weaker than the external antenna. When the antenna is close to the reference ground, most energy is concentrated between the antenna and the reference ground, and the energy cannot be transmitted smoothly, so that the antenna needs a space which is as open as possible for transmitting. The mobile phone circuit board is a reference ground of the mobile phone antenna, and the antenna is far away from other circuits of the mobile phone, which is a key for improving the transmitting efficiency of the mobile phone antenna.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: the PIFA antenna and the mobile phone with good radiation performance are provided for solving the problem of insufficient signal strength of the built-in mobile phone antenna in the prior art.

The utility model provides a technical scheme that its technical problem adopted is:

the planar surface of the radiator is parallel to the planar surface of the mainboard, the mainboard is provided with a ground slot, and the surface of the radiator is aligned with the ground slot.

In one embodiment, the distance between the radiator and the motherboard is not less than 6.5 mm.

In one embodiment, the area of the main plate is not less than 4cm²。

In one embodiment, the minimum distance between the edge of the vertical projection of the radiator on the motherboard and the edge of the ground slot is greater than 1 mm.

In one embodiment, the ground slot is rectangular.

In one embodiment, the width of any position of the ground slot is not less than 1/2 of the projection width of the radiator at the position.

A handset comprising a PIFA antenna as claimed in any one of the preceding claims.

In one embodiment, the mobile phone further includes a mobile phone holder, and a surface of the motherboard far away from the radiator is fixed to the surface of the mobile phone holder.

In one embodiment, the mobile phone support has a plurality of positioning posts, the main board has a plurality of positioning holes corresponding to the positioning posts, and the positioning posts and the positioning holes are configured such that when the main board and the mobile phone support are fixed, the positioning posts correspond to the positioning holes one to one, and the positioning posts penetrate into the corresponding positioning holes.

The utility model has the advantages that: the utility model discloses PIFA antenna and cell-phone, PIFA antenna have synthesized traditional antenna form design advantage, and through slotting with being provided with, improve the radiation efficiency of antenna radiator, have high efficiency, high gain, high bandwidth, penetrating power are strong, throughput is big, receive characteristics such as the interference of components and parts is less and have stronger hardness on every side, are applicable to the cell-phone, miniaturized product antenna design, and the antenna body is less, and radiation performance obtains improving.

Drawings

The technical solution of the present application is further explained below with reference to the drawings and the embodiments.

Fig. 1 is a schematic diagram of a PIFA antenna structure according to an embodiment of the present application;

fig. 2 is a front cross-sectional view of a cellular phone employing a PIFA antenna according to an embodiment of the present application;

fig. 3 is a back cross-sectional view of a handset employing a PIFA antenna according to an embodiment of the present application;

fig. 4 is a schematic diagram of a result of a PIFA antenna performance test according to an embodiment of the present application.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be considered limiting of the scope of the present application. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, unless otherwise specified, "a plurality" means two or more.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art through specific situations.

The technical solutions of the present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. Fig. 1 is a schematic diagram of a PIFA antenna structure according to an embodiment of the present application; fig. 2 is a front cross-sectional view of a cellular phone employing a PIFA antenna according to an embodiment of the present application; fig. 3 is a back cross-sectional view of a handset employing a PIFA antenna according to an embodiment of the present application; fig. 4 is a schematic diagram of a result of a PIFA antenna performance test according to an embodiment of the present application.

Referring to fig. 1, a PIFA antenna includes a radiator 1 and a main board 2, a plane of the radiator 1 is parallel to a plane of the main board 2, the main board 2 has a ground slot 3, and a surface of the radiator 1 is aligned with the ground slot 3. Preferably, the slot 3 is covered by the vertical projection of the radiator 1. PIFA antennas are located in the handset position as shown with reference to fig. 2 and 3.

A Planar Inverted F Antenna (PIFA) is a variant of a planar monopole antenna, and more particularly, a variant of a planar inverted L antenna, which is presented to solve the problem that the input impedance of an inverted L antenna is not easily adjusted. But the planar inverted-F antenna is arranged inside the mobile phone, the radiation power of the planar inverted-F antenna is greatly influenced, and the radiation efficiency of a radiating body of the planar inverted-F antenna can be greatly improved by arranging the ground slot.

In order to ensure the radiation intensity, in one embodiment, the distance between the radiator 1 and the main board 2 is not less than 6.5mm, and in order to limit the height of the whole antenna, the total height of the radiator 1 and the main board 2 is preferably not more than 8 mm.

In order to ensure the accommodation of the radiator 1 and the ground slot 3, in one embodiment, the area of the main board 2 is not less than 4cm². Preferably, the area of the main plate 2 is 4cm²。

In order to ensure the radiation intensity, in one embodiment, the minimum distance between the edge of the vertical projection of the radiator 1 on the motherboard 2 and the edge of the ground slot 3 is greater than 1 mm. The length and width of the slot can be adjusted according to actual conditions, so that more optimal requirements can be met. Preferably, the minimum distance between the edge of the vertical projection of the radiator 1 on the motherboard 2 and the edge of the ground slot 3 is 1.2 mm.

In one embodiment, the ground slot 3 is rectangular, and the longer length direction of the ground slot 3 is consistent with the length direction of the mobile phone, and the shorter width direction is consistent with the width direction of the mobile phone.

In order to ensure the effect of the ground slot 3 and increase the radiation intensity, in one embodiment, the width of any place of the ground slot 3 is not less than 1/2 of the projection width of the radiator 1 at the place.

The embodiment of the application also discloses a mobile phone which comprises the PIFA antenna.

In one embodiment, the mobile phone further includes a mobile phone holder, and one surface of the motherboard 2, which is far away from the radiator 1, is fixed to the surface of the mobile phone holder.

In order to position the main board 2 and reduce the positioning error, in one embodiment, the mobile phone holder has a plurality of positioning posts, the main board 2 has a plurality of positioning holes corresponding to the positioning posts, and the positioning posts and the positioning holes are configured to: when the main board 2 and the mobile phone support are fixed, the positioning columns correspond to the positioning holes one to one, and the positioning columns penetrate into the corresponding positioning holes. The positioning column is made of a non-metal material, and the positioning hole is customized according to the requirements of the mobile phone. Preferably, the number of the positioning holes and the positioning columns is not less than 3.

Referring to fig. 4, when the open-line PIFA antenna of the present invention is tested, the return loss is deeper than before, the transmission efficiency of the antenna signal is 20% from the original efficiency, and 30% after the improvement, the effect is significant.

In light of the foregoing description of the preferred embodiments according to the present application, it is to be understood that various changes and modifications may be made without departing from the spirit and scope of the invention. The technical scope of the present application is not limited to the contents of the specification, and must be determined according to the scope of the claims.

Claims

1. The PIFA antenna is characterized by comprising a radiating body and a mainboard, wherein a plane where the radiating body is located is parallel to a plane where the mainboard is located, the mainboard is provided with a ground slot, and the surface of the radiating body is aligned with the ground slot.

2. The PIFA antenna of claim 1, wherein the distance between the radiator and the board is not less than 6.5 mm.

3. The PIFA antenna according to claim 1, wherein the area of the main board is not less than 4cm²。

4. The PIFA antenna of claim 1, wherein the minimum distance between the edge of the vertical projection of the radiator on the board and the edge of the ground slot is greater than 1 mm.

5. The PIFA antenna of claim 1, wherein said ground slot is rectangular.

6. The PIFA antenna of claim 5, wherein said ground slot has a width at any location not less than 1/2 of the projected width of said radiator at that location.

7. A handset comprising a PIFA antenna as claimed in any one of claims 1 to 6.

8. The mobile phone of claim 7, further comprising a phone holder, wherein a surface of the board away from the radiator is fixed to a surface of the phone holder.

9. The mobile phone of claim 8, wherein the mobile phone holder has a plurality of positioning posts, the main board has a plurality of positioning holes corresponding to the positioning posts, the positioning posts and the positioning holes are configured such that when the main board is fixed to the mobile phone holder, the positioning posts correspond to the positioning holes one to one, and the positioning posts penetrate into the corresponding positioning holes.