CN201247819Y - Dual-frequency antenna - Google Patents

Abstract

The utility model discloses a dual-band antenna, it includes a first radiating part, a second radiating part and a third radiating part. The second radiation part is provided with a first radiation longitudinal strip which is vertical to the first radiation part and a first radiation transverse strip which is vertical to the first radiation longitudinal strip and extends out from the tail end of the first radiation longitudinal strip to one side. The third radiating part is provided with a second radiating transverse strip extending from one end of the first radiating part, which extends to form the second radiating part, a second radiating longitudinal strip extending upwards and vertically from the tail end of the second radiating transverse strip, and a third radiating transverse strip extending from the tail end of the second radiating longitudinal strip to one side. The utility model discloses dual-frenquency antenna simple structure, occupation space are few, and can receive and send out the electromagnetic wave that wireless local area network communication protocol IEEE802.11a and IEEE802.11b covered the frequency channel scope.

Description

dual frequency antenna

technical field

The utility model relates to an antenna, in particular to a dual-frequency antenna for a local area network.

Background technique

WLAN communication protocols mainly include two standards, IEEE802.11a and IEEE802.11b, among which the working frequency band of IEEE802.11a covers 5.1-5.8GHz, and the working frequency band of IEEE802.11b mainly covers 2.4-2.5GHz. And the current working frequency bands of wireless communication products are mainly 5.2GHz and 2.4GHz.

In order to make communication devices compatible with IEEE802.11a and IEEE802.11b standards, dual-band or multi-band antennas are required. Planar Inverted-F Antenna (PIFA) is a miniaturized built-in dual frequency antenna. However, since the frequency bandwidth, gain value and radiation efficiency of the antenna are proportional to the volume, the frequency bandwidth and radiation efficiency of the antenna will be reduced if the antenna is planarized and miniaturized. In the case of planarization and miniaturization, its working frequency band often cannot cover the working frequency ranges of IEEE802.11a and IEEE802.11b at the same time.

One way to solve the above problems is to use two or more antennas in combination. You can refer to the dual-frequency antenna disclosed in Chinese Patent Announcement No. 2600925. The dual-frequency antenna includes a planar inverted-F antenna and a loop antenna at the same time. . Due to the use of two different antenna structures, the working frequency band of this dual-band antenna can be adjusted in a large range, and can cover the working frequency range of IEEE802.11a and IEEE802.11b at the same time. However, this kind of antenna has a complex structure, large volume, and space Larger size is not conducive to the development of electronic products towards miniaturization.

Utility model content

The purpose of this utility model is to provide a dual-frequency antenna with simple structure and small space occupation in view of the defects and deficiencies of the above-mentioned prior art.

In order to achieve the above object, the dual-frequency antenna provided by the utility model includes a first radiating part, a second radiating part and a third radiating part, the second radiating part has a first radiating part perpendicular to the first radiating part a longitudinal bar and a first radiating horizontal bar perpendicular to the first radiating longitudinal bar and extending from the end of the first radiating longitudinal bar to one side; the third radiating part has a second radiating part extending from the first radiating part A second radiating horizontal bar extending from one end, a second radiating vertical bar extending vertically upward from the end of the second radiating horizontal bar, and a third radiating horizontal bar extending from the end of the second radiating vertical bar to one side .

As mentioned above, the dual-frequency antenna of the utility model has a simple structure and takes up less space, and can adapt to the development trend of electronic products becoming lighter, thinner, shorter, and smaller, and can send and receive wireless local area network communication protocols covered by IEEE802.11a and IEEE802.11b Electromagnetic waves in the frequency range.

Description of drawings

FIG. 1 is a plan view of an embodiment of the dual-frequency antenna of the present invention.

Figure 2 is a test chart of the voltage standing wave ratio of the dual-frequency antenna shown in Figure 1 .

The reference signs in the figure are explained as follows:

Dual frequency antenna 1 1st radiating part 11

The second radiating part 12 The first radiating vertical bar 121

The first radiating bar 122 The third radiating section 13

Second radiating horizontal bar 131 Second radiating vertical bar 132

The third radiating bar 133 Connection part 14

Positioning part 15 Positioning hole 151

Feed-in point 16 Ground point 17

Detailed ways

In order to describe the technical content, structural features, achieved goals and effects of the present utility model in detail, the following will be described in detail in conjunction with the embodiments and accompanying drawings.

Please refer to Fig. 1, the dual-band antenna 1 of the present invention has a first radiating part 11 that extends left and right to be a rectangular strip, and an edge of the first radiating part 11 extends upwards to a second radiating part 12, and the second radiating part 12 has a first radiating vertical bar 121 perpendicular to the first radiating portion 11 and a first radiating horizontal bar 122 perpendicular to the first radiating vertical bar 121 and extending rightward from the end of the first radiating vertical bar 121 . The end of the first radiating part 11 extending from the second radiating part 12 extends to the right with a third radiating part 13 , and the third radiating part 13 has an end extending from the first radiating part 11 extending from the second radiating part 12 and A second radiating horizontal bar 131 flush with the first radiating portion 11, a second radiating vertical bar 132 vertically extending upward from the end of the second radiating horizontal bar 131 and parallel to the first radiating vertical bar 121, and a second radiating vertical bar 132 extending from the end of the second radiating horizontal bar 131. A third radiating horizontal bar 133 extending rightward from the end of the second radiating vertical bar 132 and parallel to the first radiating horizontal bar 122 . The second radiating horizontal bar 131 has a connecting portion 14 extending rightward from the end extending from the second radiating vertical bar 132 . Hole 151. A feeding point 16 is provided at the intersection of the first radiating part 11 , the first radiating vertical bar 121 and the second radiating horizontal bar 131 , and a grounding point 17 is provided at the connecting part 14 and the positioning part 15 .

Please refer to FIG. 2, which is a voltage standing wave ratio (Voltage Standing Wave Ratio, VSWR) test chart of the dual-frequency antenna 1 of the present invention. It can be seen from the chart that the voltage standing wave ratio of the dual-band antenna 1 of the present invention is less than 2 when the frequency band is 2.4GHz～2.5GHz and the frequency band is 4.9GHz～5.8GHz. , 4 marked, wherein, label 1 indicates that the voltage standing wave ratio is 1.4057 when the frequency is 2.4GHz; label 2 indicates that the voltage standing wave ratio is 1.4831 when the frequency is 2.5GHz; label 3 indicates that when the frequency is 4.9GHz The voltage standing wave ratio is 1.1804; the label 4 indicates that the voltage standing wave ratio is 1.2278 when the frequency is 5.8GHz, so they all meet the IEE802.11a and 802.11b protocol standards. For the antenna within the working frequency range, the voltage standing wave ratio is not greater than 2 requirements.

The dual-frequency antenna 1 of the utility model can be fixed on the electronic product through the positioning hole 151. When the dual-frequency antenna 1 is used for communication, the first radiation part 11 can resonate with the electromagnetic wave in the 4.9GHz-5.2GHz frequency band to send and receive 4.9GHz-5.2 Electromagnetic wave signals in the GHz frequency band. The second radiation part 12 can resonate with the electromagnetic wave in the frequency range of 2.4GHz-2.5GHz to transmit and receive the electromagnetic wave signal of 2.4GHz-2.5GHz. The third radiation part 13 resonates with the electromagnetic wave in the frequency range of 5.2GHz-5.8GHz to transmit and receive the electromagnetic wave signal of 5.2GHz-5.8GHz. The first radiating part 11 and the third radiating part 13 resonate, and the resonant electromagnetic wave frequency band overlaps with each other at the 5.2 GHz frequency band, so that the bandwidth increases, thereby increasing the receiving effect of the electromagnetic wave at the 5.2 GHz frequency band, and making the dual-band antenna 1 The gain of sending and receiving signals is improved.

In summary, the dual-frequency antenna 1 of the present invention can transmit and receive electromagnetic wave signals in the 2.4GHz-2.5GHz frequency band and the 4.9GHz-5.8GHz frequency band by the first radiating part 11, the second radiating part 12 and the third radiating part 13. The structure is simple and occupies less space, which adapts to the development trend of electronic products becoming lighter, thinner, shorter and smaller, and can send and receive electromagnetic waves covered by the wireless local area network communication protocol IEEE802.11a and IEEE802.11b frequency bands.

Claims (5)

1. A dual-frequency antenna is characterized in that: it comprises a first radiation portion, a second radiation portion and a third radiation portion, and the second radiation portion has a first radiation longitudinal strip perpendicular to the first radiation portion and A first radiating horizontal bar perpendicular to the first radiating vertical bar and extending from the end of the first radiating vertical bar to one side; the third radiating part has a first radiating part extending from one end of the first radiating part extending from the second radiating part. Two radiating horizontal bars, a second radiating vertical bar vertically extending upward from the end of the second radiating horizontal bar, and a third radiating horizontal bar extending sideways from the end of the second radiating vertical bar. 2. The dual-band antenna according to claim 1, wherein the second radiating vertical strip is parallel to the first radiating vertical strip, and the third radiating horizontal strip is parallel to the first radiating horizontal strip . 3 . The dual-band antenna according to claim 1 , wherein a feeding point is provided at the intersection of the first radiating portion, the first vertical radiating bar and the second horizontal radiating bar. 4 . 4. The dual-frequency antenna as claimed in claim 1, wherein a connecting portion extends from one end of the second radiating bar, and one end of the connecting portion is connected with a positioning portion, and the connection between the connecting portion and the positioning portion There is a grounding point. 5. The dual-band antenna according to claim 4, wherein a positioning hole is arranged on the positioning part.

Images