CN1870351A - Multifrequency antenna - Google Patents

Abstract

A multi-frequency antenna, including a first antenna and a second antenna for a wireless wide area network and a third antenna and a fourth antenna for a wireless local area network, wherein the first antenna, the second antenna, the third antenna and the fourth antenna are composed of A metal sheet is formed. The antenna integrates the antennas used in the wireless wide area network and the wireless local area network, relatively reducing the installation space of the antennas, and at the same time, each antenna still has good performance.

Description

multi-frequency antenna

【Technical field】

The present invention relates to an antenna, in particular to a multi-frequency antenna for a wireless communication device.

【Background technique】

With the rapid development of mobile communications, people increasingly hope that they can access the Internet anytime and anywhere with a notebook computer or other portable terminals. The wireless access mode based on GPRS (General Packer Radio Scrvice, General Packet Radio Service) and WLAN (Wireless Local Area Network, Wireless Local Area Network) meets this demand of people to a certain extent. GPRS is a wireless network with wide area coverage, and its data transmission rate is about 30Kbps to 50Kbps, while WLAN is a wireless network with local area coverage, and its data transmission rate can reach 11Mbps (based on 802.11b technology). People choose different wireless network cards and cooperate with portable terminals such as notebook computers to access the Internet anytime and anywhere. Since the WLAN data transmission rate can reach 11Mbps, public WLAN high-speed data services are provided in some hotspots (hotels, airports, cafes, business centers, and exhibition centers). After leaving the hotspot, it will automatically switch and maintain network connection through GPRS, etc. .

In the process of wireless communication, the antenna is an indispensable and important component. Some portable terminals equipped with GPRS and WLAN dual-mode network cards will be equipped with two antennas to adapt to WWAN (Wireless Wide Area Network. Wireless Wide Area Network) and WLAN working frequency band requirements. However, portable terminals such as notebook computers are required to be miniaturized, so how to integrate the two antennas in a limited space has become a problem for designers.

【Content of invention】

The main purpose of the present invention is to provide a multi-frequency antenna, which integrates the antennas used in the wireless wide area network and wireless local area network, relatively reduces the installation space of the antenna, and at the same time, each antenna still has good performance.

To achieve the above object, the multi-frequency antenna of the present invention includes a first antenna and a second antenna for a wireless wide area network and a third antenna and a fourth antenna for a wireless local area network, wherein the first antenna, the second antenna, the third antenna and the The fourth antenna is made of a metal sheet.

Compared with the prior art, the multi-frequency antenna of the present invention reduces the overall installation space of the antenna, and can well complete the wireless communication function that originally requires multiple independent antennas.

【Description of drawings】

FIG. 1 is a perspective view of an antenna provided according to a preferred embodiment of the present invention.

Fig. 2 is a perspective view of another viewing angle antenna provided according to a preferred embodiment of the present invention.

Fig. 3 is a test diagram of the voltage standing wave ratio of the wireless wide area network frequency band of the antenna in this embodiment.

FIG. 4 is a test diagram of the voltage standing wave ratio of the wireless local area network frequency band of the antenna in this embodiment.

FIG. 5 is a test diagram of antenna isolation in this embodiment.

【Detailed ways】

Please refer to FIG. 1 and FIG. 2 , which are perspective views of a multi-frequency antenna provided according to a preferred embodiment of the present invention. The multi-frequency antenna 10 includes a first antenna 1 and a second antenna 2 for a wireless wide area network, and a third antenna 3 and a fourth antenna 4 for a wireless local area network. The multi-frequency antenna 10 is made by stamping a metal sheet, and combines the wireless wide area network antenna and the wireless local area network antenna together.

Both ends of the multi-frequency antenna 10 have a first mounting portion 61 and a second mounting portion 62 , and the first mounting portion 61 and the second mounting portion 62 form a mounting plane. The multi-band antenna 10 includes a ground portion 50 , which is a common ground portion for the first antenna 1 , the second antenna 2 , the third antenna 3 and the fourth antenna 4 . A bending portion 14 extends vertically upward from the grounding portion 50 , and the bending portion 14 is in the shape of a horizontal strip, and one end of the bending portion 14 is connected to the first mounting portion 61 . The first antenna 1 and the second antenna 2 include a connecting portion 12 extending upward from a bent portion 14 . The first antenna 1 includes a first radiating portion 11 , the radiating portion 11 is connected to the ground portion 50 through the first connecting portion 12 and the bending portion 14 . The first radiating part 11 adopts a three-dimensional bending design and extends along a direction parallel to the longitudinal direction of the installation plane, thereby shortening the length in the transverse direction of the installation plane perpendicular to the longitudinal direction. If the plane where the first connecting part 12 and the bending part 14 are located is defined as the first plane, the plane where the radiation part 11 of the first antenna 1 is located is defined as the second plane, and the plane where the grounding part 50 is located is defined as the third plane, then The first plane is respectively perpendicular to the second plane and the third plane, and the first plane is on the same plane as the installation plane. The radiation part 11 of the first antenna 1 extends toward the second installation part 62 in the second plane, and its open end 110 is close to the second installation part 62 . The center frequency at which the first antenna 1 works is about 900 MHz. The second antenna 2 includes a second radiating portion 21 , the second radiating portion 21 extends from the first connecting portion 12 toward the first mounting portion 61 , and its open end 210 is close to the first mounting portion 61 . The center frequency at which the second antenna 2 works is about 1900 MHz. The first antenna 1 and the second antenna 2 share a feed point 120 , and the feed point 120 is located on the first connecting portion 12 . We can use a coaxial cable (not shown) to feed in, solder the inner core wire of the coaxial cable to the feeding point 120 , and weld the metal braid to the grounding part 50 . Both the first antenna 1 and the second antenna 2 are planar inverted-F antennas (Planar Inverted-F Antenna, PIFA).

The third antenna 3 includes a third radiation portion 31 , and the fourth antenna 4 includes a fourth radiation portion 41 . The third antenna 3 and the fourth antenna 4 share a second connecting portion 34 , and the second connecting portion 34 is connected to the other end of the bending portion 14 . The third radiating portion 31 and the fourth radiating portion 41 are connected to the ground portion 50 through the second connecting portion 34 and the bending portion 14 . The third radiating portion 31 and the fourth radiating portion 41 are located on a straight line and respectively extend in opposite directions from the ends of the second connecting portion 34 . The third radiation portion 31 extends toward the first installation portion 61 , and the fourth radiation portion 41 extends toward the second installation portion 62 . The second connecting portion 34 and the bent portion 14 connect the radiation portion 31 of the third antenna 3 and the radiation portion 41 of the fourth antenna 4 to the ground portion 50 respectively, forming two planar inverted-F antennas respectively. The third antenna 3 and the fourth antenna 4 share a feed point 340 , which is set on the second connection part 34 , and the two antennas can also be fed by coaxial line feed. The working center frequency of the third antenna is 2.4GHz, and the working center frequency of the fourth antenna is 5.2GHz.

The radiation part 11 of the first antenna 1 working in the low frequency band of the wireless wide area network and the radiation part 31 of the third antenna 3 working in the low frequency band of the wireless local area network are arranged alternately so that the distance between the open ends 110 and 310 of the two is as far as possible , so as to reduce the interference of signal reception and radiation of the first antenna and the third antenna. The distance between the center frequencies of the second antenna 2 working in the high frequency band of the wireless wide area network and the third antenna 3 working in the low frequency band of the wireless local area network is the smallest, so interference between the two antennas is more likely to occur. However, in this embodiment, the spatial positions of the two antennas are placed so that there is a certain space between them, which can meet the requirements for normal operation of the two antennas. The radiating part 21 of the second antenna 2, the radiating part 31 of the third antenna 3, the radiating part 41 of the fourth antenna 4, the first and second connecting parts 12, 34 and the bending part 14 are all located on the same plane, that is, the first flat. The antenna of the present invention can be installed on the left and right sides of the upper side of the display screen of the notebook computer, and the antenna can respond to different wireless network cards by using a double-feed mode to combine various wireless applications.

Fig. 3 is a VSWR test chart of a wireless wide area network antenna, the vertical axis is the VSWR value, and the horizontal axis is the frequency value. Fig. 4 is a VSWR test chart of a wireless LAN antenna, the vertical axis is the VSWR value, and the horizontal axis is the frequency value. The ideal value of VSWR is 1. In actual tests, it is generally believed that the VSWR is within an acceptable range if it is less than 2. It can be seen from Figure 3 that the VSWR in the frequency bands near 900MHz and 1900MHz are both can meet the requirements. It can be seen from Figure 4 that the voltage standing wave ratio in the frequency bands around 2.4GHz and 5.2GHz can also meet the requirements. FIG. 5 is a test diagram of the isolation of the antenna 10 , the vertical axis is the isolation value, and the horizontal axis is the frequency value. It can be seen from Figure 5 that in the wireless wide area network and wireless local area network frequency bands, the tested isolation values are all lower than -15dB, which meets the requirements of practical applications.

Claims (10)

1. multifrequency antenna, comprise first antenna and second antenna and third antenna that is used for WLAN (wireless local area network) and the 4th antenna that are used for wireless wide area network, it is characterized in that: first antenna, second antenna, third antenna and the 4th antenna are made by a sheet metal and are formed.

2. multifrequency antenna as claimed in claim 1 is characterized in that: first antenna and second antenna are planar inverted-F antenna.

3. multifrequency antenna as claimed in claim 1 is characterized in that: third antenna and the 4th antenna are planar inverted-F antenna.

4. multifrequency antenna as claimed in claim 1 is characterized in that: the centre frequency of the first antenna work is 900MHz, and the centre frequency of the second antenna work is 1900MHz.

5. multifrequency antenna as claimed in claim 1 is characterized in that: the centre frequency of third antenna work is 2.4GHz, and the centre frequency of the 4th operating frequency of antenna is 5.2GHz.

6. multifrequency antenna as claimed in claim 1 is characterized in that: this multifrequency antenna comprises a grounding parts, and this grounding parts is the shared grounding parts of first antenna, second antenna, third antenna and the 4th antenna.

7. multifrequency antenna as claimed in claim 1 is characterized in that: first antenna has identical load point with second antenna, and third antenna also has identical load point with the 4th antenna.

8. multifrequency antenna as claimed in claim 1 is characterized in that: first antenna, third antenna comprise a Department of Radiation respectively, and the Department of Radiation of first antenna and the Department of Radiation of third antenna extend towards opposing direction.

9. multifrequency antenna as claimed in claim 1 is characterized in that: second antenna, the 4th antenna comprise a Department of Radiation respectively, and the Department of Radiation of the Department of Radiation of second antenna and the 4th antenna extends towards opposing direction.

10. multifrequency antenna as claimed in claim 1, it is characterized in that: the Department of Radiation of the Department of Radiation of second antenna, the Department of Radiation of third antenna and the 4th antenna is positioned at first plane, the Department of Radiation of first antenna is positioned at second plane, first plane is perpendicular to second plane, this multifrequency antenna also comprises a grounding parts, this grounding parts is positioned at the 3rd plane, and the 3rd plane is perpendicular to first plane.

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