TW201818602A - External antenna device and antenna structure thereof - Google Patents

Abstract

An external antenna device includes a connecting carrier, an elongated case mounted on the connecting carrier, a signal cable arranged in the connecting carrier and the case, and an antenna structure arranged in the case. The antenna structure includes an elongated substrate, a grounding segment, an antenna segment, a matching module, and a low-frequency extending segment, which are disposed on the substrate. The low-frequency extending segment and the grounding segment are arranged at two opposite sides of the antenna segment. The antenna segment includes a feeding portion, a high-frequency portion, and a low-frequency portion. The signal cable is electrically connected to the grounding segment and the feeding portion. The high-frequency portion and the low-frequency portion are electrically connected to the feeding portion and the grounding segment by using the matching module. A total distance of the signal path of the low-frequency portion and the signal path of the low-frequency extending segment is 0.375~0.625 times of a wavelength corresponding to a center frequency of a low-frequency band. The low-frequency extending segment is arranged apart from and is electrically coupling to the low-frequency portion.

Description

   External antenna device and antenna structure thereof   

The invention relates to an antenna, in particular to an external antenna device and an antenna structure thereof.

The existing antenna device can be divided into a built-in antenna (such as a mobile phone antenna) installed inside the electronic device and an external antenna (such as a sharer antenna) installed outside the electronic device. Among them, in order to increase the antenna gain of the existing external antennas, most of them adopt an integral extension of the length of the low-frequency antenna or a low-frequency antenna connected in series to the radiator. However, although the above-mentioned external external antenna can increase the antenna gain, it will also limit the bandwidth it can operate. In addition, the low-frequency antenna connected in series to the radiator will cause impedance drift and other issues.

Therefore, the present invention considers that the above-mentioned defects can be improved, and it is with special research and cooperation with the application of scientific principles that it finally proposes an invention with a reasonable design and effective improvement of the above-mentioned defects.

The embodiments of the present invention provide an external antenna device and an antenna structure thereof, which can improve the problems that may occur with the existing external antenna.

An embodiment of the present invention discloses an external antenna device for detachably mounting on an electronic device. The external antenna device includes: an external socket for detachably mounting on the electronic device; a casing, It is elongated and forms an accommodating space and an installation opening communicating with the accommodating space, and the installation opening of the casing is connected to the external socket to make the accommodating space closed. A signal cable is partially passed through the external socket, and the rest is disposed in the accommodation space; wherein the signal cable includes a free end and a fixed end, and the free end is used for electrical properties. Connected to the electronic device installed in the socket; and an antenna structure disposed in the accommodation space for operation in a high frequency band and a low frequency band, the antenna structure includes: The substrate is elongated and defines a length direction; a ground section is disposed on the substrate; an antenna section is disposed on the substrate, and the antenna section includes a feed section, a high-frequency antenna section, and a low-frequency antenna section , So The fixed end of the signal cable is electrically connected to the ground section and the feeding section; a matching module is provided on the substrate, and the high-frequency antenna section and the low-frequency antenna section are connected via The matching module is electrically connected to the feeding section and the ground section; and a low-frequency extension section is disposed on the substrate, and the low-frequency extension section and the ground section are located substantially opposite to the antenna section. On both sides, the sum of the signal paths of the low-frequency extension section and the low-frequency antenna section is approximately 0.375 times to 0.625 times the center frequency of the low-frequency band; wherein the low-frequency extension section and the antenna section have There is a gap, and the low-frequency extension is electrically coupled to the low-frequency antenna portion.

An embodiment of the present invention also discloses an antenna structure of an external antenna device for operating in a high frequency band and a low frequency band. The antenna structure of the external antenna device includes a substrate, which is elongated and defines a length. Direction; a ground section provided on the substrate; an antenna section provided on the substrate; the antenna section includes a feed section, a high-frequency antenna section, and a low-frequency antenna section; a matching module provided on the substrate The substrate, and the high-frequency antenna portion and the low-frequency antenna portion are electrically connected to the feeding portion and the ground section via the matching module; and a low-frequency extension section provided on the substrate, In addition, the low-frequency extension section and the ground section are located substantially on opposite sides of the antenna section, and the sum of the signal paths of the low-frequency extension section and the low-frequency antenna section is approximately 0.375 times to the center frequency of the low-frequency band. 0.625 times the wavelength; wherein there is a gap between the low-frequency extension and the antenna section, and the low-frequency extension is electrically coupled to the low-frequency antenna portion.

In summary, the external antenna device and its antenna structure disclosed in the embodiments of the present invention are electrically coupled to the low-frequency extension through the low-frequency antenna portion, so that the signal path provided by the two is approximately the center frequency of the low-frequency band. The wavelength of 0.125 times to 0.375 times, thereby increasing the antenna gain of the antenna structure and making the frequency band applicable to the antenna structure have a larger bandwidth.

In order to further understand the features and technical contents of the present invention, please refer to the following detailed description and drawings of the present invention, but these descriptions and drawings are only used to illustrate the present invention, and not to make any limitation to the protection scope of the present invention. limit.

100‧‧‧External antenna device

1‧‧‧ Outer Block

11‧‧‧ tube body

2‧‧‧shell

21‧‧‧ accommodation space

22‧‧‧Mounting port

3‧‧‧Signal cable

31‧‧‧ free end

32‧‧‧Fixed end

4‧‧‧ Antenna Structure

41‧‧‧ substrate

411‧‧‧First board

412‧‧‧Second board surface

413‧‧‧The first conductive post

414‧‧‧Second conductive post

415‧‧‧The third conductive post

42‧‧‧ Grounding Section

421‧‧‧ missing angle

43‧‧‧antenna section

431‧‧‧Feeding Department

432‧‧‧High-frequency antenna section

433‧‧‧Low-frequency antenna section

44‧‧‧ matching module

441‧‧‧High-frequency microstrip line

442‧‧‧Low frequency microstrip line

443‧‧‧High-frequency coupling pad

444‧‧‧Low-frequency coupling pad

45‧‧‧Soldering pad

46‧‧‧ Low frequency extension

D‧‧‧length direction

G‧‧‧ Clearance

FIG. 1 is a schematic perspective view of an external antenna device according to the present invention.

FIG. 2 is an exploded view of FIG. 1.

FIG. 3 is a schematic diagram of the antenna structure in FIG. 2.

FIG. 4 is a partially enlarged schematic diagram of FIG. 3.

FIG. 5 is an enlarged schematic view of FIG. 4 from another perspective.

FIG. 6 is another partially enlarged schematic diagram of FIG. 3.

FIG. 7 is a schematic diagram of another embodiment of an antenna structure according to the present invention.

FIG. 8 is a schematic diagram of another embodiment of an antenna structure according to the present invention.

FIG. 9 is a schematic diagram of the test of FIG. 1.

Please refer to FIGS. 1 to 9, which are embodiments of the present invention. It should be noted that this embodiment corresponds to the related quantities and appearances mentioned in the drawings, and is only used to specifically describe the embodiments of the present invention, so that In order to understand the content of the present invention, it is not intended to limit the protection scope of the present invention.

As shown in FIG. 1 and FIG. 2, this embodiment discloses an external antenna device 100 for detachably mounting an electronic device (such as a host of a sharer). That is, the external antenna device 100 of this embodiment is different from an antenna (such as a mobile phone antenna) provided inside the electronic device. Wherein, the external antenna device 100 includes an external base 1, a housing 2 connected to the external base 1, a signal cable 3 passing through the external base 1 and the housing 2, and An antenna structure 4 inside the casing 2 and electrically connected to the signal cable 3. In addition, the antenna structure 4 of this embodiment is applied to the above-mentioned external base 1, the housing 2, and the signal cable 3, but the present invention is not limited thereto. The structure of each element of the external antenna device 100 in this embodiment will be described separately, and then the connection relationship between the elements will be described in due course.

As shown in FIG. 1 and FIG. 2, the external socket 1 is used to be detachably mounted on the electronic device, and the external socket 1 in this embodiment includes two pipe bodies 11 pivotally connected to each other, and the two pipes are connected to each other. The inside of the body 11 communicates with each other.

The casing 2 is elongated, and the casing 2 is formed with an accommodating space 21 and a mounting port 22 communicating with the accommodating space 21. Further, the accommodating space 21 can communicate with the outside only through the mounting port 22. Furthermore, the mounting port 22 of the casing 2 is detachably assembled to the external socket 1 so that the accommodating space 21 of the casing 2 is closed.

The signal cable 3 is partially passed through the external socket 1, and the other parts are disposed in the accommodation space 21 of the housing 2. The signal cable 3 includes a free end 31 and a fixed end 32. The free end 31 is one of the tube bodies 11 provided on the external socket 1 for electrically connecting to the electronic device installed on the external socket 1. The fixed end 32 is used to be electrically connected to the antenna structure 4.

The antenna structure 4 is disposed in the accommodating space 21 of the casing 2 to operate in a high-frequency band and a low-frequency band. The high-frequency band and the low-frequency band have a larger bandwidth based on the structure of the antenna structure 4 described below, and the above-mentioned high-frequency band is, for example, 1710 MHz to 2690 MHz in this embodiment, and the low-frequency band is in this embodiment. For example, 690 MHz to 960 MHz, but the present invention is not limited to this. Further, the antenna structure 4 in this embodiment includes a substrate 41 and a ground section 42, an antenna section 43, a matching module 44, and a soldering pad 45 (see FIG. 5) disposed on the substrate 41. , And a low-frequency extension 46.

Wherein, the substrate 41 is elongated and defines a length direction D, and the shape of the substrate 41 substantially corresponds to the cross-section of the casing 2, so the casing 2 can be sleeved on the substrate along the length direction D. 41 外. Furthermore, the substrate 41 has a first plate surface 411 and a second plate surface 412 on opposite sides.

As shown in FIG. 2 to FIG. 4, the grounding segment 42 is disposed on the first plate surface 411 of the substrate 41, and the grounding segment 42 is adjacent to the external socket 1. Wherein, the grounding section 42 of this embodiment is in a straight strip shape and a notch 421 is formed at a corner away from the external socket 1. In more detail, the signal path of the ground segment 42 is approximately 0.125 times the wavelength of the center frequency of the low frequency band (ie, 1 / 8λ), and the signal path of the ground segment 42 in this embodiment is equivalent to the ground segment 42 Corresponds to the length in the length direction D.

As shown in FIG. 2 to FIG. 5, the antenna section 43 is disposed on the first surface 411 of the substrate, and the antenna section 43 includes a feeding section 431, a high-frequency antenna section 432, and a low-frequency antenna section 433. The high-frequency antenna portion 432 and the low-frequency antenna portion 433 of the present embodiment are spaced apart from each other and form a substantially U-shaped profile. The notch of the U-shaped profile faces the ground segment 42, and the feed-in portion 431 is substantially located in the U. Within the notch of the contour and adjacent to the ground section 42. Furthermore, one end of the high-frequency antenna portion 432 and one end of the low-frequency antenna portion 433 (ie, both ends of the U-shaped profile) are located on opposite sides of the feeding portion 431 and are adjacent to the ground segment 42.

Further, the fixed end 32 of the signal cable 3 is electrically connected to the ground section 42 and the feeding section 431, and the high-frequency antenna section 432 and the low-frequency antenna section 433 are electrically connected via the matching module 44. It is sexually connected to the feeding portion 431 and the ground segment 42. The matching module 44 of this embodiment includes a high-frequency microstrip line 441 and a low-frequency microstrip line 442 disposed on the first plate surface 411 of the substrate 41, and a high-frequency microstrip line 442 disposed on the second plate surface 412 of the substrate 41. The coupling pad 443 and a low-frequency coupling pad 444.

In more detail, both ends of the high-frequency microstrip line 441 are connected to the feeding portion 431 and the high-frequency antenna portion 432, respectively, so as to provide an effect as an inductive element between the feeding portion 431 and the high-frequency antenna portion 432. . The two ends of the low-frequency microstrip line 442 are respectively connected to the ground section 42 and the low-frequency antenna section 433, so as to provide an effect as an inductive element between the ground section 42 and the low-frequency antenna section 433. Most of the above-mentioned low-frequency microstrip lines 442 are located in the notch 421 of the ground segment 42.

Furthermore, the high-frequency coupling pad 443 is electrically connected to the high-frequency antenna portion 432 through at least one first conductive post 413 embedded in the substrate 41 (that is, two of the first conductive post 413 Terminals are respectively connected to the high-frequency coupling pad 443 and the high-frequency antenna section 432), and the high-frequency coupling pad 443 can be electrically coupled to the ground section 42 so as to provide a capacitive element between the ground section 42 and the high-frequency antenna section 432 The role. The low-frequency coupling pad 444 is electrically connected to the feeding portion 431 through at least one second conductive pillar 414 embedded in the substrate 41 (that is, two ends of the second conductive pillar 414 are respectively connected to the low-frequency coupling pad. 444 and the feeding portion 431), and the low-frequency coupling pad 444 can be electrically coupled to the low-frequency antenna portion 433, so as to provide a function as a capacitive element between the feeding portion 431 and the low-frequency antenna portion 433.

In addition, the soldering pad 45 is electrically connected to the ground segment 42 through at least one third conductive pillar 415 embedded in the substrate 41 (that is, two ends of the third conductive pillar 415 are respectively connected to soldering pads). 45 and the ground section 42), and the fixed end 32 of the signal cable 3 in this embodiment is welded to the welding pad 45 and the low-frequency coupling pad 444 so as to be electrically connected to the ground section 42 and the feeding portion 431.

As shown in FIG. 3 to FIG. 6, the low-frequency extension section 46 is located far from the external socket 1, that is, the low-frequency extension section 46 and the ground section 42 are located on the opposite sides of the antenna section 43 (such as the antenna section in FIG. 3). 43 upper and lower sides). There is a gap G between the low-frequency extension section 46 and the antenna section 43 (the low-frequency antenna section 433), and the size of the gap G is insufficient to affect the low-frequency extension section 46 to be electrically coupled to the low-frequency antenna section 433. The gap G in this embodiment is approximately 0.5 mm (mm) to 1 mm in the length direction L, but the present invention is not limited thereto.

Further, the sum of the signal paths of the low-frequency extension section 46 and the low-frequency antenna section 43 is approximately 0.375 times to 0.625 times the center frequency of the low-frequency band (ie, 1 / 8λ to 3 / 8λ). The signal path of the low-frequency antenna section 433 is approximately 0.125 times the wavelength of the center frequency of the low-frequency band, and the signal path of the low-frequency extension 46 is approximately 0.125 to 0.375 times the center frequency of the low-frequency band. Times the wavelength. It should be noted that the signal path of the low-frequency extension 46 is straight in this embodiment and is substantially equal to the length of the low-frequency extension 46 corresponding to the length direction L. In this embodiment, the low-frequency extension 46 The signal path is preferably a wavelength of 0.375 times the center frequency of the low-frequency band, but is not limited thereto.

In addition, the low-frequency extension section 46 shown in FIG. 3 is described by taking a straight bar as an example, but the appearance of the low-frequency extension section 46 can also be adjusted according to the needs of the designer. For example, as shown in FIG. 7, the low-frequency extension 46 may also be bent (that is, the signal path of the low-frequency extension 46 is bent), so that the low-frequency extension 46 provides a signal for signal operation. The path is unchanged, but the length of the low-frequency extension section 46 corresponding to the length direction D can be shortened, which is further beneficial to be applied to a shorter substrate 41. That is, the signal path of the low-frequency extension 46 shown in FIG. 7 is greater than the length of the low-frequency extension 46 corresponding to the length direction D.

Furthermore, the ground section 42, the feeding section 431, the high-frequency antenna section 432, the low-frequency antenna section 433, and the low-frequency extension section 46 shown in FIG. 3 are all provided on the first plate surface 411 of the substrate 41 as an example. For explanation, the present invention is not limited to this. For example, as shown in FIG. 8, the low-frequency extension section 46 may also be disposed on the second surface 412 of the substrate 41, and a part of the low-frequency extension section 46 is located below the low-frequency antenna portion 433 and can be electrically coupled to each other.

In summary, the external antenna device 100 and its antenna structure 4 disclosed in this embodiment are electrically coupled to the low-frequency extension 46 through the low-frequency antenna portion 433, so that the signal path provided by the two is approximately in the low-frequency band. The center frequency is 0.125 times to 0.375 times the wavelength, thereby increasing the antenna gain of the antenna structure 4 (for example, the antenna gain of the antenna structure 4 in the low frequency band and the high frequency band can be maintained substantially above 3dBi) and the antenna structure 4 is applicable. The frequency band has a larger bandwidth (as shown in FIG. 9).

The above are only the preferred and feasible embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. Any equal changes and modifications made in accordance with the scope of patent application of the present invention shall fall within the protection scope of the claims of the present invention. .

Claims (10)

    An external antenna device is used for detachably mounting an electronic device. The external antenna device includes: an external socket for detachably mounting on the electronic device; a casing, which is elongated and formed There is an accommodating space and a mounting port communicating with the accommodating space, and the mounting port of the casing is connected to the external socket so that the accommodating space is closed; a signal cable, It is partially passed through the external socket, and the other parts are arranged in the accommodating space; wherein the signal cable includes a free end and a fixed end, and the free end is used to be electrically connected to the plug. The electronic device mounted on the socket; and an antenna structure disposed in the accommodating space for operation in a high frequency band and a low frequency band, the antenna structure includes: a substrate, which is elongated A length direction is defined; a ground section is provided on the substrate; an antenna section is provided on the substrate; the antenna section includes a feed section, a high-frequency antenna section, and a low-frequency antenna section, and the signal line Of the cable The fixed terminal is electrically connected to the ground section and the feeding section; a matching module is disposed on the substrate, and the high-frequency antenna section and the low-frequency antenna section are electrically connected via the matching module. Connected to the feeding portion and the ground section; and a low-frequency extension section provided on the substrate, and the low-frequency extension section and the ground section are located substantially on opposite sides of the antenna section, and the low-frequency extension section The sum of the signal paths of the segment and the low-frequency antenna segment is approximately 0.375 times to 0.625 times the wavelength of the center frequency of the low-frequency band; wherein there is a gap between the low-frequency extension and the antenna segment, and the low-frequency The extension is electrically coupled to the low-frequency antenna portion.         The external antenna device according to claim 1, wherein the ground section is adjacent to the external base, and the low-frequency extension section is far from the external base.         The external antenna device according to claim 1, wherein the substrate has a first plate surface and a second plate surface on opposite sides, the ground section, the feeding portion, and the high-frequency antenna portion The low-frequency antenna portion and the low-frequency extension are all disposed on the first plate surface of the substrate.         The external antenna device according to claim 3, wherein the feeding section and the high-frequency antenna section are adjacent to the ground section, and the matching module includes: a high-frequency microstrip line provided on the ground section. A first board surface, and two ends of the high-frequency microstrip line are respectively connected to the feeding portion and the high-frequency antenna portion; a low-frequency microstrip line is provided on the first board surface, and the low frequency The two ends of the microstrip line are respectively connected to the ground section and the low-frequency antenna portion; a high-frequency coupling pad is disposed on the second board surface, and the high-frequency coupling pad is A first conductive pillar is electrically connected to the high-frequency antenna part, and the high-frequency coupling pad can be electrically coupled to the ground segment; and a low-frequency coupling pad is disposed on the second board surface, the The low-frequency coupling pad is electrically connected to the feeding portion via a second conductive post embedded in the substrate, and the low-frequency coupling pad can be electrically coupled to the low-frequency antenna portion.         The external antenna device according to claim 4, wherein the antenna structure includes a soldering pad, and the soldering pad is electrically connected to the ground section through a third conductive post embedded in the substrate. The fixed end of the signal cable is welded to the welding pad and the low-frequency coupling pad.         The external antenna device according to any one of claims 1 to 5, wherein the signal path of the low-frequency antenna section is approximately 0.125 times the wavelength of the center frequency of the low-frequency band; The signal path is approximately a wavelength of 0.125 times to 0.375 times the center frequency of the low frequency band; the signal path of the ground section is approximately 0.125 times the wavelength of the center frequency of the low frequency band.         The external antenna device according to claim 6, wherein the signal path of the low-frequency extension is equal to the length of the low-frequency extension corresponding to the length direction; the signal path of the ground section It is equivalent to that the ground segment corresponds to a length in the length direction.         The external antenna device according to any one of claims 1 to 5, wherein the gap is approximately 0.5 mm to 1 mm in the length direction; the signal path of the low-frequency extension is approximately The wavelength is 0.375 times the center frequency of the low frequency band.         An antenna structure of an external antenna device is used to operate in a high frequency band and a low frequency band. The antenna structure of the external antenna device includes: a substrate, which is elongated and defines a length direction; a grounding section, Disposed on the substrate; an antenna section disposed on the substrate, the antenna section including a feed section, a high-frequency antenna section, and a low-frequency antenna section; a matching module disposed on the substrate, and the The high-frequency antenna section and the low-frequency antenna section are electrically connected to the feeding section and the ground section via the matching module; and a low-frequency extension section is provided on the substrate, and the low-frequency extension section And the ground segment is located substantially on opposite sides of the antenna segment, and the sum of the signal paths of the low-frequency extension segment and the low-frequency antenna segment is approximately 0.375 times to 0.625 times the center frequency of the low-frequency band; There is a gap between the low-frequency extension section and the antenna section, and the low-frequency extension section is electrically coupled to the low-frequency antenna section.         The antenna structure of the external antenna device according to claim 9, wherein the signal path of the low-frequency antenna section is approximately 0.125 times the wavelength of the center frequency of the low-frequency band; the signal of the low-frequency extension The path is approximately a wavelength of 0.125 times to 0.375 times the center frequency of the low frequency band.