TWM535882U - Antenna with dual operating frequency bands - Google Patents

Abstract

An antenna with dual operating frequency bands includes a first arm extending toward a first direction, a second arm electrically connected to the first arm and extending toward a second direction, wherein the first and second arms resonate a first signal component of a radio-frequency signal, and the first direction is perpendicular to the second direction, a third arm electrically connected to the feeding element and the first arm, extending toward the second direction, and for resonating a second signal component of the radio-frequency signal, a ground arm electrically connected to the second arm and extending toward an opposite of the first direction, and a ground electrically connected to the ground arm and extending toward the second direction.

Description

Dual frequency operating antenna

This creation refers to a dual-frequency operating antenna, especially a dual-frequency operating antenna suitable for metal environments.

Today's wireless network communication products are becoming more and more diversified. In order to achieve a light, thin, short, and small appearance, product sizes are often limited. Monopole antennas, Planar Inverted-F Antenna (PIFA) or dipole antennas are often used as built-in antennas for network communication products. However, the performance of the antenna is greatly affected by the surrounding environment. For example, the size of the space that the product can provide, the configuration of adjacent metal components such as the circuit board and the mechanical components affect the radiation field of the antenna, thereby limiting the operating bandwidth of the antenna. Reducing the radiation efficiency is not conducive to the actual signal transmission and reception, but also reduces the communication range. Therefore, how to build broadband and increase radiation efficiency to increase communication range is one of the major technical challenges in this field.

Therefore, the main purpose of this creation is to provide a dual-frequency operating antenna suitable for metal environments.

The present invention discloses an antenna for a wireless communication device including a feed element, a first arm, a second arm, a third arm, a ground arm, and a grounding portion. The feed element is used to feed an RF signal. The first arm is electrically connected to the feeding element and extends in a first direction. The second arm is electrically connected to the first arm and extends in a second direction, wherein the first arm and the second arm are used to resonate a first signal component of the RF signal, and the first The direction is perpendicular to the second direction. The third arm is electrically connected to the feeding component and the first arm, and extends in the second direction to resonate a second signal component of the RF signal. The grounding arm is electrically connected to the second arm and extends in a direction opposite to the first direction. The grounding portion is electrically connected to the grounding arm and extends in the second direction.

Compared with the single resonant mode of the conventional planar inverted-F antenna, the antenna of the present invention has dual-frequency operation, and the additional arm is added and the matching of the arm is adjusted through the coupling element to generate another resonant mode, so this creation The antenna can meet the needs of dual-band communication systems. In addition, the present invention reduces the influence of internal circuit components and metal devices of the wireless communication device by adjusting the size of the grounding portion of the antenna to ensure communication quality.

FIG. 1 is a schematic diagram of an antenna 10 according to an embodiment of the present invention. The antenna 10 can be used in a wireless communication device such as a Wireless Dongle, a Bluetooth communication device, a smart phone, a tablet, an IP camera, and a personal computer. The antenna 10 includes arms 11, 12 and 13, a ground arm 14, a ground portion 15, a feed element 16, a parasitic element 17, and a coupling element 18. The wireless communication device can include a wireless communication module (not shown in FIG. 1) for generating an RF signal RF_sig to the antenna 10 and processing the RF signal received by the antenna 10 for wireless communication.

The feed component 16 is coupled to the wireless communication module for feeding the RF signal RF_sig. The arm 11 is electrically connected to the feed element 16 and extends in a +Y direction (first direction). The arm 12 is electrically connected to the arm 11 and extends in a -X direction (second direction), wherein the arms 11 and 12 are used to resonate a first signal component of the RF signal RF_sig, and the +X/-X direction is vertical +Y/ -Y direction. The arm 13 is electrically connected to the feeding element 16 and the arm 11 and extends in the -X direction for resonating a second signal component of the RF signal RF_sig. The grounding arm 14 is electrically connected to the arm 12 and extends in the -Y direction. The grounding portion 15 is electrically connected to the grounding arm 14 and extends in the -X direction. The parasitic element 17 is electrically connected to the open end of the arm 12 for adjusting the matching of the second arm. The coupling element 18 is electrically connected to the grounding portion 15 for generating a coupling effect with the arm 13 to adjust the matching of the arm 13. The arm 11, the arm 12, the ground arm 14 and the parasitic element 17 are formed on a curved surface (for example, a curved surface covering the XY plane), and the arm 13, the ground portion 15, and the coupling element 18 are formed on a plane (for example, the XZ plane) And the projection of the surface in the XZ plane presents an open downward parabola (see Figure 2).

It is worth noting that the antenna 10 is designed based on the architecture of Planar Inverted-F Antenna (PIFA). Compared with the single resonant mode and single-frequency operation of the traditional planar inverted-F antenna, the antenna 10 is additionally The arm 13 is added and the matching of the arm 13 is adjusted through the coupling element 18 to generate another resonant mode, so that the antenna 10 can meet the requirements of the dual-band communication system (for example, the 2.4 GHz band and the 5 GHz band of the WiFi communication technology).

In addition, in the X direction, the length L15 of the grounding portion 15 is greater than the projection length L12 of the arm 12 in the XZ plane. Under this structure, by adjusting the size of the grounding portion 15, the internal circuit components and metal of the wireless communication device can be effectively reduced. The impact of the device to ensure communication quality. Specifically, in an embodiment, internal circuit components and metal components of the wireless communication device may be disposed adjacent to the ground portion 15, and the ground portion 15 may serve as an isolation component for avoiding the radiator of the antenna 10. (eg, arms 11, 12, and 13) are subject to noise interference from internal circuit components. Therefore, the antenna 10 can be applied to a metal environment.

It should be noted that those skilled in the art can modify the changes accordingly, and are not limited to the above embodiments. For example, in an embodiment, in the X direction, the length L15 of the ground portion 15 is 17.9 mm, and the projection length L12 of the arm 12 in the XZ plane is 15.34 mm; the arm 11 and the ground arm 14 are at XZ. The projection distance L11_14 of the plane is 1.9 mm; the length L18 of the coupling element 18 is 4 mm; the length L13 of the arm 13 is 4 mm; and the distance between the parasitic element 17 and the arm 11 is 7.3 mm. In the Z direction, the distance L13_18 of the coupling element 18 from the arm 13 is 0.7 mm. Furthermore, the length extending from the feed element 16 via the arm 11 to the open end of the arm 12 is a quarter wavelength of the first signal component, and the length extending from the feed element 16 to the open end of the arm 13 is a second The quarter wavelength of the signal component. In one embodiment, the frequency of the first signal component is 2.4 GHz to 2.5 GHz, and the frequency of the second signal component is 5.1 GHz to 5.8 GHz, which is applicable to a Wireless Local Area Network (WiFi), WiFi, and Bluetooth ( Bluetooth) The frequency range specified by the wireless communication technology. However, in other embodiments, by adjusting the length, shape, and the like of the components included in the antenna 10, the resonant mode matching and operating frequency of the antenna 10 can be adjusted to be applicable to other wireless communication technologies, such as the third generation. Mobile communication technology, Long Term Evolution (LTE), etc.

FIG. 2 is a schematic diagram of an antenna module 20 according to an embodiment of the present invention. The antenna module 20 includes an antenna 10, a coaxial cable 22, and a bracket 24. The coaxial cable 22 is coupled to the wireless communication module, and the inner core wire is electrically connected to the feeding component 16 to transmit the RF signal RF_sig, and the outer braided wire is electrically connected to the grounding portion 15. In order to integrate the antenna 10 into the interior of the product, a curved printed circuit can be realized by using a Flexible Printed Circuit (FPC) process with the bracket 24. In practice, the pattern of the antenna 10 can be first printed on the wrapable printed circuit board 19 of FIG. 1, and the wrapable printed circuit board 19 can be coated with a backing to adhere the antenna 10 to the bracket 24. Therefore, after the antenna 10 is integrated into the product, its arm 11 extends from the feed element 16 in the horizontal + Y direction, and the arm 14 extends from the arm 12 in the horizontal-Y direction. However, the present invention is not limited thereto. In one embodiment, the antenna 10 can be formed on the bracket 24 by Laser Direct Structuring (LDS) technology. In another embodiment, the antenna pattern can be cut by a metal iron piece and then wound onto the bracket 24.

3 and 4 show the reflection coefficient S11 of the antenna 10 and the radiation efficiency, respectively. As shown in Fig. 3, the reflection coefficient S11 of the antenna 10 at a frequency of 2.4 to 2.5 GHz and a frequency of 5.1 to 5.8 GHz is lower than -10 dB; as shown in Fig. 4, the antenna 10 has a frequency of 2.4 to 2.5 GHz and a frequency of 5.1 to ～. The 5.8 GHz radiation efficiency is greater than -4 dB. Therefore, the antenna 10 can be applied to wireless communication technologies such as a wireless local area network, WiFi, and Bluetooth.

In summary, compared with the single resonant mode of the conventional planar inverted-F antenna, the dual-frequency operating antenna of the present invention additionally adds an arm and adjusts the matching of the arm through the coupling element to generate another resonant mode. The antenna of this creation can meet the needs of dual-band communication systems. In addition, the present invention reduces the influence of internal circuit components and metal devices of the wireless communication device by adjusting the size of the grounding portion of the antenna to ensure communication quality.

10‧‧‧Antenna
11, 12, 13 ‧ ‧ arms
14‧‧‧ Grounding arm
15‧‧‧ Grounding Department
16‧‧‧Feed components
17‧‧‧ Parasitic components
18‧‧‧Coupling components
19‧‧‧Wrapable printed circuit boards
L12, L13, L15, L18, L11_14, L11_17, L13_18‧‧‧ length
RF_sig‧‧‧RF signal
X, Y, Z‧‧ Direction
20‧‧‧Antenna Module
22‧‧‧Coaxial cable
24‧‧‧ bracket

FIG. 1 is a schematic diagram of an antenna according to an embodiment of the present invention. FIG. 2 is a schematic diagram of an antenna module according to an embodiment of the present invention. Fig. 3 and Fig. 4 respectively show the reflection coefficient S11 and the radiation efficiency of the antenna of Fig. 1.

10‧‧‧Antenna

11, 12, 13 ‧ ‧ arms

14‧‧‧ Grounding arm

15‧‧‧ Grounding Department

16‧‧‧Feed components

17‧‧‧ Parasitic components

18‧‧‧Coupling components

19‧‧‧Wrapable printed circuit boards

L12, L13, L15, L18, L11_14, L11_17, L13_18‧‧‧ length

RF_sig‧‧‧RF signal

X, Y, Z‧‧ Direction

Claims (10)

An antenna for a wireless communication device, comprising: a feeding component for feeding an RF signal; a first arm electrically connected to the feeding component, extending in a first direction; a second An arm is electrically connected to the first arm and extends in a second direction, wherein the first arm and the second arm are configured to resonate a first signal component of the RF signal, and the first direction is vertical a second arm electrically connected to the feeding element and the first arm, extending toward the second direction for resonating a second signal component of the RF signal; a grounding arm Electrically connected to the second arm, extending in a direction opposite to the first direction; and a grounding portion electrically connected to the grounding arm and extending in the second direction. The antenna of claim 1, wherein the first arm, the second arm, and the ground arm are formed on a curved surface, the third arm and the ground portion are formed on a plane, and the curved surface is The projection of the plane presents an open downward parabola. The antenna of claim 2, wherein in the second direction, the length of the ground portion is greater than a projection length of the second arm at the plane. The antenna of claim 2, wherein the length of the ground portion is 17.9 mm along the second direction, and the projection length of the second arm at the plane is 15.34 mm, and the first arm and the ground are The projection distance of the arm on the plane is 1.9 mm. The antenna of claim 1, further comprising a parasitic element electrically connected to the open end of the second arm for adjusting the matching of the second arm, and the parasitic element is formed on a curved surface. The antenna of claim 5, wherein in the second direction, the distance between the parasitic element and the first arm is 7.3 mm. The antenna of claim 1, further comprising a coupling component electrically connected to the ground portion for generating a coupling effect with the third arm to adjust the matching of the third arm, and the coupling The components are formed on a flat surface. The antenna of claim 7, wherein the distance between the coupling element and the third arm is 0.7 mm in a third direction, and the third direction is perpendicular to the first direction and the second direction, and along In the second direction, the coupling element has a length of 4 mm. The antenna of claim 1, wherein the third arm has a length of 4 mm along the second direction. The antenna of claim 1, wherein a length from the feed element extending through the first arm to an open end of the second arm is a quarter wavelength of the first signal component, and from the feed The length of the element extending to the open end of the third arm is a quarter wavelength of the second signal component.