TWI538311B - Antenna module - Google Patents

Description

Antenna module

The present invention relates to an antenna module, and more particularly to an antenna module capable of shortening the size of an antenna.

With the rapid development of wireless communication technologies, portable communication devices, such as mobile phones, personal digital assistants (PDAs), navigation devices, portable computers, etc., can now use wireless communication devices to transmit signals. The antenna is an essential component in the portable communication device. By transmitting and receiving the RF signal through the antenna, the portable communication device can achieve the function of wireless communication.

Since the functions of the portable communication device are continuously expanded, the components of the portable communication device need to be integrated more and more, so how to effectively shorten the length of the antenna of the portable communication device can be improved. The internal space utilization of the portable communication device is regarded as the focus of research and development. For example, Taiwan Patent No. 513829 "Small Antenna" discloses that the antenna is designed into a structure to shorten the length of the antenna, and Taiwan Patent No. M331772 "a kind of A ceramic wafer antenna having a multi-layer coupled coil discloses the incorporation of a ceramic material into an antenna to take advantage of the properties of the ceramic material itself to shorten the length of the antenna. Although the antenna disclosed in the patent application can achieve the purpose of shortening the length, when the antenna is actually used in a portable communication device, most of the antenna radiation characteristics need to be adjusted for different environments, such as the frequency band of the antenna. However, the antenna disclosed in the patent application is difficult to adjust the radiation characteristics of the antenna due to special structural or material characteristics.

Therefore, how to develop an antenna module that can improve the above-mentioned conventional antenna and shorten the length of the antenna and easily adjust the radiation characteristics of the antenna is an urgent problem to be solved.

The purpose of the present invention is to provide an antenna module, which is difficult to adjust the antenna radiation characteristics due to special structure or material characteristics.

Another object of the present invention is to provide an antenna module in which a metal component is disposed adjacent to the antenna body. Therefore, by adjusting the length of the metal component, the antenna body can be lowered without increasing the length. The frequency band of the application.

In order to achieve the above object, a broader embodiment of the present invention provides an antenna module including: an antenna body including a radiating portion for transmitting and receiving radio frequency signals; and a metal member adjacent to the radiating portion One side of the part is used to reduce the frequency band applied by the antenna body, and has an extended short-circuit end electrically connected to the ground end of the system circuit board.

1‧‧‧Antenna Module

10‧‧‧Antenna body

11‧‧‧Metal parts

110‧‧‧ Subject

111‧‧‧ Extended short-circuit end

12‧‧‧ base

120‧‧‧Signal feed end

121‧‧‧Antenna short-circuit end

13‧‧‧ Radiation Department

2‧‧‧System Board

20, 21‧‧‧ Grounding

The first figure is a schematic structural view of an antenna module of a preferred embodiment of the present invention disposed on a system circuit board.

Second: It is a side view of the antenna module and system board shown in the first figure.

The third figure is a comparison diagram of the return loss of the antenna module shown in the first figure and a conventional antenna.

Some exemplary embodiments embodying the features and advantages of the present invention are described in detail in the following description. It is to be understood that the present invention is capable of various modifications in the various aspects of the present invention, and is not intended to

Please refer to the first and second figures, wherein the first figure is a structural diagram of the antenna module of the preferred embodiment of the present invention, and the second figure is the antenna module and system shown in the first figure. Side view of the board. As shown in the first and second figures, the antenna module 1 of the present embodiment is disposed on a system circuit board 2, wherein the system circuit board 2 is disposed on a portable communication device (not shown), for example. : Mobile, personal digital assistant, global positioning system (GPS) or portable computer.

The antenna module 1 mainly includes an antenna body 10 and a metal component 11 , wherein the antenna body 10 can be, but not limited to, a Planar Inverted F Antenna (PIFA), and includes a base portion 12 and a radiating portion 13 . The base 12 includes a signal feeding end 120 and at least one antenna shorting end 121. The signal feeding end 120 extends vertically from one side of the base 12 and is adjacent to the system circuit board 2, and the signal feeding end 120 is used. To feed an RF signal (not shown). The antenna short-circuiting end 121 extends perpendicularly from the same side of the base 12 to the signal feeding end 120 and is electrically connected to one of the grounding ends 20 of the system board 2 to avoid being embedded on the system board 2. Metal components (not shown) absorb the RF signal and generate secondary radiation. The radiating portion 13 is substantially a long strip-like structure connected to the base portion 12 and adjacent to the system circuit board 2 for receiving and transmitting radio frequency signals.

In some embodiments, the antenna body 10 can be, but is not limited to, a single-band operation, and the best one is applied to a Bluetooth band of 2400 MHz, but is not limited thereto. It can also be applied to other single-band operations, such as a global satellite positioning system with a frequency of 1575.42 MHz or a wireless local area network (WiFi) with a frequency band of 2400 MHz.

In other embodiments, the length of the antenna body 10 is substantially equal to a wavelength corresponding to a quarter of its resonant frequency. Further, the structural aspect of the radiating portion 13 is not limited to the strip as shown in the first figure. The plate-like structure can also have different shapes depending on different portable communication devices, different frequency bands or different setting environments, for example, an arc type, a loop type or a multi-square type, but not This is limited.

The metal member 11 is adjacent to one side of the radiating portion 13 in parallel with the radiating portion 13, and has a main body 110 and an extended short-circuiting end 111, wherein the extended short-circuiting end 111 is bent by one end of the main body 110, so that The metal member 11 has an L-shaped structure, and the extended short-circuit end 111 is electrically connected to the other ground end 21 of the system board 2.

Since the length of the antenna is actually inversely proportional to the applied frequency band, when the antenna is to be applied to the lower frequency band, the length of the antenna must be correspondingly increased, but since the antenna module 1 of the present case is to be adjacent to the metal component 11 It is disposed on one side of the radiating portion 13, so that there is a coupling amount between the metal member 11 and the radiating portion 13, so that the coupling amount can be changed by adjusting the length of the metal member 11, so that the antenna body 10 is When the length is not increased, the frequency band to be applied is lowered. Therefore, when the antenna body 10 of the antenna module 1 of the present invention is applied to the same frequency band as the conventional antenna system, the length of the antenna body 10 is longer than that of the conventional antenna. The length is short.

In the above embodiment, the metal member 11 is disposed adjacent to the radiation portion 13, so that the metal member 11 and the radiation portion 13 have a separation distance H, wherein the length of the separation distance H is preferably less than 10 mm. But not limited to this, but by adjusting the interval The distance of the impedance of the antenna body 10 can be adjusted by the distance H.

In some embodiments, the metal member 11 and the antenna body 10 are made of the same metal material, such as copper foil, but not limited thereto, and may be composed of different metal materials. In addition, the metal component 11 can be directly realized by components in the portable communication device, such as a metal component on the system circuit board 2 or a metal frame (not shown) of a liquid crystal display module (LCM).

Of course, the shape of the metal member 11 is not limited to the L-shaped structure as shown in the first figure, and may be different according to actual needs, for example, corresponding to the radiation portion 13 of different shapes. In addition, the metal member 11 is also It may be disposed on one side of the radiation portion 13 in a manner perpendicular to the radiation portion 13.

The advantages of the antenna module 1 of the present embodiment compared to the conventional antenna will be exemplarily described below by taking the third figure as an example. Please refer to the third figure and cooperate with the first and second figures. The third figure is a comparison of the return loss of the antenna module shown in the first figure and a conventional antenna. As shown in the third figure, since the length of the antenna is inversely proportional to the applied frequency band, when the antenna is to be applied to the lower frequency band, the length of the antenna must be correspondingly increased, thereby knowing that if the antenna is known (such as The dotted line shown in the third figure is applied to a frequency band of, for example, 3000 MHz, and if it is to be applied to, for example, a Bluetooth band having a frequency band of 2400 MHz, the length of the conventional antenna is inevitably required to be increased, and in view of the antenna module 1 of the present case, due to the antenna mode In the group 1 , the metal member 11 is placed in the vicinity of the antenna body 10 (as shown by the solid line in the third figure), so that the metal member 11 and the radiation portion 13 can be changed by adjusting the length of the metal member 11 provided. The amount of coupling between the antenna body 10 and the antenna body 10 is reduced by the length of the antenna body 10, so that the antenna body 10 of the present invention is applied to the antenna as shown in FIG. When the frequency band is 2400MHz, the length of the antenna body 10 is compared with the conventional day applied to the frequency band 2400MHz. The line can be shortened by, for example, 13 to 25% or more.

In summary, the present invention provides an antenna module in which a metal component is disposed adjacent to the antenna body, so that the length of the metal component can be adjusted to simply reduce the frequency band to which the antenna body is applied, in other words, the antenna. The antenna radiation characteristics of the body can be easily adjusted by metal parts. In addition, by the arrangement of the metal components, the antenna body can maintain its own length without reducing the frequency band while the applied frequency band is used. Therefore, the length of the antenna body at this time is smaller than that of the conventional antenna applied in the same frequency band. It will be relatively shortened.

The present invention has been described in detail by the above-described embodiments, and may be modified by those skilled in the art, without departing from the scope of the appended claims.

1‧‧‧Antenna Module

10‧‧‧Antenna body

11‧‧‧Metal parts

110‧‧‧ body

111‧‧‧ Extended short-circuit end

12‧‧‧ base

120‧‧‧Signal feed end

121‧‧‧Antenna short-circuit end

13‧‧‧ Radiation Department

2‧‧‧System Board

Claims (10)

An antenna module includes: an antenna body including a radiating portion for transmitting and receiving an RF signal; and a metal member disposed adjacent to one side of the radiating portion by adjusting The length of the metal component changes the coupling amount between the metal component and the radiating portion, thereby reducing the frequency band to which the antenna body is applied, and the metal component has an extended short-circuiting end, which is electrically connected to one of the grounding ends of a system circuit board. Sexual connection. The antenna module of claim 1, wherein the antenna system is an inverted F antenna. The antenna module of claim 1, wherein the antenna body further has a base portion including a signal feed end and an antenna short circuit end, wherein the signal feed end is configured to feed the RF signal. The short circuit end of the antenna is connected to another ground end of the circuit board of the system. The antenna module of claim 1, wherein the antenna system is applied to a single frequency band operation. The antenna module of claim 4, wherein the antenna system is applied to a Bluetooth, a global satellite positioning system or a wireless local area network. The antenna module of claim 1, wherein the metal component further has a body, and the extended short-circuit end is bent from one end of the body. The antenna module of claim 6, wherein the metal component is an L-shaped structure. The antenna module of claim 1, wherein the metal component and the radiating portion have a separation distance for adjusting an impedance bandwidth of the antenna body. The antenna module of claim 1, wherein the metal component and the material of the antenna body are the same or different metal materials. The antenna module of claim 1, wherein the metal component is formed by a metal component on the circuit board of the system or a metal frame of a liquid crystal display module.