TWI679810B - Multi-frequency antenna with multiple feedings - Google Patents

Abstract

A multi-feed multi-frequency antenna device includes a substrate, an antenna body, an antenna branch portion, a first coaxial line, and a second coaxial line. The antenna body and the antenna branch portion are both disposed on the substrate, and have first and second signal feeding points, respectively. The first coaxial line has a first outer conductive layer for connecting the ground layer and a first core wire for connecting the first signal feeding point, and the first core wire is used for feeding the first signal into the first signal feeding point so that the antenna The body generates a radio frequency signal having a first frequency band. The second coaxial line has a second outer conductive layer connected to the antenna body and a second core wire connected to the second signal feeding point. The second core wire is used to feed the second signal to the second signal feeding point so that the antenna branch portion Generate a radio frequency signal having a second frequency band.

Description

Multi-feed multi-frequency antenna device

The invention relates to an antenna device, in particular to a multi-frequency antenna device with multiple feeds.

In recent years, with the application of wireless communication technology and the popularization of light, thin and short communication products, the development of antenna technology has become particularly important in the application of communication products. In terms of existing antenna technologies, when a product needs to be applied to two wireless communication technologies, it is usually necessary to design two different antennas for the frequencies of the two different wireless communication technologies. However, if the two antennas are respectively designed in different spaces, it will cause excessive space occupation.

The invention proposes a multi-feed multi-frequency antenna device. Multiple signal feed points can be designed on the same antenna to generate multiple radio frequency signals in different frequency bands.

According to an embodiment of the present invention, a multi-feed multi-frequency antenna device is disclosed, including a substrate, an antenna body, an antenna branch portion, a first coaxial line, and a second coaxial line. The antenna body is disposed on the substrate and has a first signal feeding point. The antenna branch is provided on the substrate and has a second signal feeding point. The first coaxial line has a first outer conductive layer and a first core wire. The first outer conductive layer is used to connect the ground layer. The first core wire is connected to the first signal feeding point and is used to feed the first signal into the first signal feeding. Point so that the antenna body generates a radio frequency signal having a first frequency band. The second coaxial line has a second outer conductive layer and a second core wire. The second outer conductive layer is connected to the antenna body. The second core wire extends to the antenna branch and connects to the second signal feeding point. The second core wire is used to connect the second signal. The second signal feeding point is fed in, so that the antenna branch generates a radio frequency signal having a second frequency band.

In summary, in the multi-feed multi-frequency antenna device proposed by the present invention, the main It should be tied to the original antenna body structure, add another coaxial cable or wires and connect the outer conductive layer to the antenna body, and connect the core wires to the signal feeder on another antenna branch Access point, so that the same antenna device can send and receive signals from different frequency bands of multiple communication technologies at the same time. In this way, the communication technologies of different frequency bands are integrated on the same antenna device, which can greatly reduce the occupied space.

The above description of the contents of this disclosure and the description of the following embodiments are used to demonstrate and explain the spirit and principle of the present invention, and provide a further explanation of the scope of the patent application of the present invention.

10, 30‧‧‧ substrate

12, 32‧‧‧ Antenna body

12a ~ 12c, 32a ~ 32c‧‧‧Conductive part

14, 15‧‧‧ Antenna branch

16, 36‧‧‧ the first coaxial line

161, 361‧‧‧ the first outer conductive layer

162, 362‧‧‧‧first core wire

18, 38‧‧‧ Second coaxial line

181, 381‧‧‧ second outer conductive layer

182, 382‧‧‧Second core wire

19, 39‧‧‧ Third coaxial line

191, 391‧‧‧ Third outer conductive layer

192, 392‧‧‧ Third core wire

21, 22, 23, 41, 42‧‧‧ signal sources

SIG1, SIG1’‧‧‧ the first signal

SIG2, SIG2’‧‧‧ second signal

F1, F1’‧‧‧‧ the first signal feed-in point

F2, F2’‧‧‧‧ the second signal feed-in point

F3, F3’‧‧‧ the third signal feed point

S1, S2‧‧‧bearing surface

d‧‧‧distance

T1, T1’‧‧‧ open end

FIG. 1 is a structural diagram of a multi-feed multi-frequency antenna device according to an embodiment of the present invention.

FIG. 2 is a structural diagram of a multi-feed multi-frequency antenna device according to another embodiment of the present invention.

FIG. 3 is a structural diagram of a multi-feed multi-frequency antenna device according to another embodiment of the present invention.

4A and 4B are waveform diagrams of radio frequency signals having a second frequency band and a first frequency band, respectively, according to an embodiment of the present invention.

The detailed features and advantages of the present invention are described in detail in the following embodiments. The content is sufficient for any person skilled in the art to understand and implement the technical contents of the present invention. Anyone skilled in the relevant art can easily understand the related objects and advantages of the present invention. The following examples further illustrate the viewpoints of the present invention in detail, but do not limit the scope of the present invention in any way.

Please refer to FIG. 1. FIG. 1 is a structural diagram of a multi-feed multi-frequency antenna device according to an embodiment of the present invention. As shown in FIG. 1, a multi-feed multi-frequency antenna device 1 (hereinafter abbreviated as (Referred to as "antenna device 1") includes a substrate 10, an antenna body 12, an antenna branch portion 14, a first coaxial line 16, and a second coaxial line 18. The antenna body 12 and the antenna branch portion 14 are both disposed on the bearing surface S1 of the substrate 10 and each have a corresponding antenna pattern. In practice, the substrate 10 is a single-layer or multi-layer substrate, and may be, for example, a glass-fiber epoxy (FR4) substrate. Use different types of substrates. In the embodiment of FIG. 1, the antenna body 12 has a first signal feeding point and includes a plurality of conductive portions 12 a, 12 b, and 12 c. Each conductive portion 12a, 12b, and 12c corresponds to a different frequency band, for example, 700 to 960 MHz, 1710 to 2170 MHz, and 2500 to 2690 MHz.

The antenna device 1 of the present invention can be used in conjunction with a signal source. As shown in FIG. 1, the first coaxial line 16 of the antenna device 1 is connected to the first signal source 21 and receives the first signal SIG1 generated by the first signal source 21. The second coaxial line 18 of the antenna device 1 is connected to the second signal source 22 and receives the second signal SIG2 generated by the second signal source 22. The first signal source 21 and the second signal source 22 described herein may be signal generators, such as generating radio frequency signals having a certain frequency band, but the present invention is not limited thereto.

More specifically, the first coaxial line 16 has a first outer conductive layer 161 and a first core wire 162. The first outer conductive layer 161 is used to connect to the ground layer (not shown), and the first core wire 162 is connected to the first signal feeding point F1. The first core wire 162 of the first coaxial line 16 is mainly used to feed the first signal SIG1 from the first signal source 21 to the first signal feed point F1, so that the antenna body 12 generates a radio frequency signal having a first frequency band.

On the other hand, the second coaxial wire 18 includes a second outer conductive layer 181 and a second core wire 182. The second outer conductive layer 181 is connected to the antenna body 12, and the second core wire 182 extends to the antenna branch 14 and connects to the second signal feeding point F2. The second core wire 182 of the second coaxial wire 18 can be used to feed the second signal SIG2. The second signal feeding point F2 is input so that the antenna branch 14 generates a radio frequency signal having a second frequency band.

In the foregoing example, the first frequency band may be a wireless wide area network (Wireless Wide Area Network, WWAN) frequency band, and the second frequency band may be a wireless local area network. (Wireless Local Area Network, WLAN) frequency band, but the present invention is not limited thereto. In practice, the aforementioned first outer conductive layer 161 and the second outer conductive layer 181 are woven meshes, which respectively cover the first core wire 162 and the second core wire 162. A non-conductive material is used to isolate the braided mesh from the core wire, and the second outer conductive layer 181 can be connected to the antenna body 12 by welding.

In an embodiment, as shown in FIG. 1, the conductive portion 12 a of the antenna body 12 extends along the first path to the first open-circuit end T1, the orthographic projection of the second signal feeding point F2 on the first path and the first open circuit. The distance of the end T1 is within a first predetermined range. Specifically, the first path is a path extended by the conductive portion 12a, and the setting position of the second signal feeding point F2 is calculated from the first open end T1 to the first in the orthographic projection 2 of the first path. The signal feed-in point F1 is within a first predetermined range. In the embodiment of FIG. 1, the orthographic projection of the second signal feeding point F2 on the first path is adjacent to the first open end T1 and far from the first signal feeding point F1. That is, the setting position of the second signal feeding point F2 is closer to the first open end T1, but the invention is not limited thereto.

In one embodiment, the first predetermined range is related to the resonance wavelength of the conductive portion 12a of the antenna body. More specifically, in an embodiment, the first predetermined range is greater than zero and less than or equal to one-sixteenth of a resonance wavelength of the conductive portion 12a. That is, the second signal feeding point F2 may be established at any position within a range of one-sixteenth of this resonance wavelength from the first open end T1 toward the first signal feeding point F1. In more detail, as shown in FIG. 1, the setting position of the second signal feeding point F2 is a distance d from the first open-circuit end T1 in the horizontal direction, and the distance d is less than or equal to the resonance wavelength of the conductive portion 12 a. One sixteenth.

In a preferred embodiment, the second signal feed-in point F2 may be established in any one-twentieth range of this resonance wavelength from the first open-circuit end T1 toward the first signal feed-in point F1. position. In practice, establishing the second signal feeding point F2 within this first predetermined range can ensure that the antenna device 1 emits signals in a normal frequency band.

In the foregoing embodiment, the second signal feeding point F2 is established within the first predetermined range, that is, the second signal feeding point F2 is horizontally separated from the first open-circuit end T1 and The first signal feeding point F1 is a distance away. However, in another embodiment, the second signal feeding point F2 is aligned with the first open end T1 in the vertical direction (that is, the distance d is zero).

Please refer to FIG. 2, which is a structural diagram of a multi-feed multi-frequency antenna device according to another embodiment of the present invention. The antenna device of FIG. 2 is substantially the same as the antenna device of FIG. 1 except that the antenna device 1 of FIG. 2 further includes another antenna branch portion 15 and a third coaxial line 19. The antenna branch portion 15 is also disposed on the bearing surface S1 of the substrate 10 and has a third signal feeding point F3. The third coaxial line 19 has a third outer conductive layer 191 and a third core wire 192. The third outer conductive layer 191 is connected to the antenna body 12, and the third core wire 192 extends to the antenna branch portion 15 and is connected to the third signal feeding point F3. The third core wire 192 is used to feed the third signal SIG3 into the third signal feeding point F3, so that the antenna branch 15 generates a radio frequency signal having a third frequency band.

In the embodiment of FIG. 2, the conductive portion 12b of the antenna body 12 extends along the second path to the second open end T2, and the distance between the orthographic projection of the third signal feeding point F3 on the second path and the second open end T2 is Within the second predetermined range. The second path is a path extended by the conductive portion 12b. In one embodiment, the second predetermined range is related to the resonance wavelength of the second conductive portion 12 b of the antenna body 12. More specifically, in one embodiment, the second predetermined range is greater than zero and less than or equal to one-sixteenth of the resonance wavelength of the conductive portion 12b.

That is, the third signal feeding point F3 may be established at any position within a range of one-sixteenth of this resonance wavelength from the second open end T2 toward the first signal feeding point F1. In a preferred embodiment, the third signal feeding point F3 may be established in any one-sixteenth range of this resonance wavelength from the second open end T2 toward the first signal feeding point F1. position. In an embodiment, the third signal feeding point F3 may also be established at a position aligned with the second open end T2 in the vertical direction. Although not shown in the text, the antenna device 1 of the present invention can establish another feeding point in the same manner as described above according to the open end position of the conductive portion 12c, so that the antenna device 1 further generates a radio frequency signal in another frequency band.

Please refer to FIG. 3, which is a structural diagram of a multi-feed multi-frequency antenna device according to another embodiment of the present invention. The antenna device 3 of FIG. 3 is roughly the same as the antenna device 3 of FIG. 1. Have the same architecture. The antenna device 3 includes a substrate 30, an antenna body 32, an antenna branch portion 34, a first coaxial line 36, and a second coaxial line 38. The antenna device 3 further includes another antenna branch portion 35 and a third coaxial line 19. The antenna body 32, the antenna branch portion 34, and the antenna branch portion 35 are all provided on the substrate 10. The antenna body 32 has a first signal feeding point F1 ', and the antenna branch portion 34 and the antenna branch portion 35 have a second signal feeding point F2' and a third signal feeding point F3 ', respectively.

The first outer conductive layer 361 of the first coaxial line 36 is used to connect to the ground layer (not shown), and the first core wire 362 of the first coaxial line 36 is used to feed the first signal SIG1 'from the signal source 41. The first signal feeding point F1 'causes the antenna body 32 to generate a radio frequency signal having a first frequency band. The second outer conductive layer 381 of the second coaxial line 38 is connected to the antenna body 32, and the second core wire 382 of the second coaxial line 38 is used to feed the second signal SIG2 'from the signal source 42 to the second signal feeding point F2 ', So that the antenna branch portion 34 generates a radio frequency signal having a second frequency band. The first frequency band described herein may be a frequency band of a wireless wide area network (WWAN), and the second frequency band may be a frequency band of a wireless local area network (WLAN), but the present invention is not limited thereto.

On the other hand, the third outer conductive layer 391 of the third coaxial line 39 is connected to the antenna branch portion 34, and the third core wire 192 of the third coaxial line 39 extends to the antenna branch portion 35 and connects to the third signal feeding point F3 '. The third core wire 392 is used to feed the third signal SIG3 'from the signal source 43 to the third signal feeding point F3, so that the second antenna branch 35 generates a radio frequency signal having a third frequency band. In practice, the setting position of the third signal feed point F3 'may be related to the antenna branch 34, for example, the third signal feed point F3' is established within a predetermined range from the open end of the antenna branch 34. .

Please refer to FIG. 4A and FIG. 4B. FIG. 4A and FIG. 4B are waveform diagrams of radio frequency signals having a second frequency band and a first frequency band, respectively, according to an embodiment of the present invention. FIG. 4A is a radio frequency signal (WLAN) having a second frequency band measured in the antenna device of the present invention, and FIG. 4B is a radio frequency signal (WLAN) having a second frequency band measured in the antenna device of the present invention. Radio frequency signals (WWAN) in a frequency band. From the waveform shown in FIG. 4A, the measured frequencies f1 and f2 of the second frequency band are approximately 2.69 GHz and 5.15 GHz, respectively. From the waveform shown in Figure 4B, The measured frequencies f3, f4, and f5 of the first frequency band are approximately 960 MHz, 2.17 GHz, and 2.69 GHz, respectively. The waveform diagrams of FIG. 4A and FIG. 4B can verify that the antenna device proposed by the present invention can efficiently generate radio frequency signals of different frequency bands.

In summary, the multi-feed multi-frequency antenna device proposed in the present invention is mainly based on the structure of the original antenna body, adding another or more coaxial lines and connecting the outer conductive layer to the antenna body. And the core wire is connected to the signal feed-in points on the branch of one or more antennas, so that the same antenna device can send and receive signals of different frequency bands at the same time. In this way, the communication technology of different frequency bands can be integrated on the same antenna device, so as to effectively reduce the occupation of the internal space of the device and improve the space utilization rate.

Although the present invention is disclosed in the foregoing embodiments, it is not intended to limit the present invention. Changes and modifications made without departing from the spirit and scope of the present invention belong to the patent protection scope of the present invention. For the protection scope defined by the present invention, please refer to the attached patent application scope.

Claims (9)

A multi-feed multi-frequency antenna device includes: a substrate; an antenna body including a first conductive portion and a second conductive portion, which is disposed on the substrate and has a first signal feeding point; a first day A line branch portion provided on the substrate and having a second signal feed point; a second antenna branch portion provided on the substrate and having a third signal feed point; a first coaxial line having a first signal feed point An outer conductive layer and a first core wire, the first outer conductive layer is used to connect a ground layer, the first core wire is connected to the first signal feeding point and is used to feed a first signal into the first signal feeding Point, so that the antenna body generates a radio frequency signal having a first frequency band; a second coaxial line having a second outer conductive layer and a second core wire, the second outer conductive layer is connected to the antenna body, and the second The core wire extends to the branch of the first antenna and is electrically connected to the second signal feeding point. The second core wire is used to feed a second signal into the second signal feeding point, so that the first antenna The branch generates a radio frequency signal having a second frequency band; and a third coaxial line, There is a third outer conductive layer and a third core wire, the third outer conductive layer is connected to the antenna body, the third core wire extends to the second antenna branch and is connected to the third signal feeding point, the third core wire It is used for feeding a third signal into the third signal feeding point, so that the second antenna branch part generates a radio frequency signal with a third frequency band; wherein the first conductive part of the antenna body is along a first The path extends to a first open end, and the distance between the orthographic projection of the second signal feeding point on the first path and the first open end is within a first predetermined range. The multi-feed multi-frequency antenna device according to claim 1, wherein the orthographic projection of the second signal feed point on the first path is adjacent to the first open end and far from the first signal feed point. The multi-feed multi-frequency antenna device according to claim 1, wherein the first predetermined range is associated with a resonance wavelength of the first conductive portion of the antenna body. The multi-feed multi-frequency antenna device according to claim 3, wherein the first predetermined range is greater than zero and less than or equal to one-sixteenth of the resonance wavelength. The multi-feed multi-frequency antenna device according to claim 4, wherein the first predetermined range is one-twentieth of the resonance wavelength. The multi-feed multi-frequency antenna device according to claim 1, wherein the second signal feed point is aligned with the first open end in a vertical direction. The multi-feed multi-frequency antenna device according to claim 1, wherein the second conductive portion of the antenna body extends along a second path to a second open end, and the third signal feeding point is at the second The distance between the orthographic projection on the path and the second open end is within a second predetermined range. The multi-feed multi-frequency antenna device according to claim 7, wherein the second predetermined range is associated with a resonance wavelength of the second conductive portion of the antenna body. The multi-feed multi-frequency antenna device according to claim 1, wherein the first frequency band is a frequency band of a wireless wide area network (WWAN), and the second frequency band is a frequency band of the wireless local area network (WLAN).