CN111725603B

CN111725603B - Communication device and antenna structure

Info

Publication number: CN111725603B
Application number: CN201910202032.2A
Authority: CN
Inventors: 黄钧麟; 黄健庭
Original assignee: Wistron Neweb Corp
Current assignee: Wistron Neweb Corp
Priority date: 2019-03-18
Filing date: 2019-03-18
Publication date: 2022-03-08
Anticipated expiration: 2039-03-18
Also published as: CN111725603A

Abstract

The invention discloses a communication device and an antenna structure, wherein the communication device comprises: a non-conductive housing, a cable, an antenna structure, and a signal source. The non-conductive housing has a hollow structure. The cable is coupled to the signal source, wherein the cable comprises a signal conductor and a grounding conductor. The antenna structure comprises an antenna body and an embedded radiating part. The antenna body is coupled to the signal conductor, wherein the antenna body is disposed outside the non-conductive housing. The embedded radiating portion is coupled to the ground conductor, wherein the embedded radiating portion is disposed inside the non-conductive housing.

Description

Communication device and antenna structure

Technical Field

The present invention relates to a Communication Device (Communication Device), and more particularly, to a Communication Device and an Antenna Structure thereof.

Background

With the development of Mobile communication technology, Mobile devices (Mobile devices) have become increasingly popular in recent years, and are commonly used, for example: portable computers, mobile phones, multimedia players and other portable electronic devices with mixed functions. To meet the demand of people, mobile devices usually have wireless communication functions. Some cover long-distance wireless communication ranges, such as: the mobile phone uses 2G, 3G, LTE (Long Term Evolution) system and its used frequency bands of 700MHz, 850MHz, 900MHz, 1800MHz, 1900MHz, 2100MHz, 2300MHz and 2500MHz for communication, while some cover short-distance wireless communication ranges, for example: Wi-Fi and Bluetooth systems use 2.4GHz, 5.2GHz and 5.8GHz frequency bands for communication.

A Wireless Access Point (Wireless Access Point) is a necessary component for enabling a mobile device to Access internet indoors at a high speed. However, since the indoor environment is full of signal reflections and Multipath Fading (Multipath Fading), the wireless network base station must be able to process signals from all directions and all polarizations simultaneously. Therefore, how to design a multi-polarization antenna in the limited space of the wireless network base station has become a big challenge for designers nowadays.

Disclosure of Invention

In a preferred embodiment, the present invention provides a communication device, comprising: a non-conductive housing having a hollow structure; a signal source; a cable coupled to the signal source and including a signal conductor and a ground conductor; and an antenna structure comprising: an antenna body coupled to the signal conductor, wherein the antenna body is disposed outside the non-conductive housing; and an embedded radiating portion coupled to the ground conductor, wherein the embedded radiating portion is disposed inside the non-conductive housing.

In some embodiments, the embedded radiating portion presents a straight strip shape.

In some embodiments, an angle between the antenna body and the embedded radiating portion is between 0 and 180 degrees.

In some embodiments, the antenna structure covers a low frequency band between 700MHz and 960MHz and a high frequency band between 1700MHz and 2700 MHz.

In some embodiments, the antenna body is classified as a folded dipole antenna.

In some embodiments, the spacing between the antenna body and the embedded radiating portion is less than or equal to 3 wavelengths of the low frequency band.

In some embodiments, the antenna body comprises: a connecting radiation part coupled to a positive feed point; a main radiation part coupled to the connection radiation part; a first meandering radiation portion coupled to a negative feed point; and a second meandering radiation portion coupled to the negative feed point; wherein the connecting radiation portion is interposed between the first meandering radiation portion and the second meandering radiation portion.

In some embodiments, the connecting radiating portion, the first serpentine radiating portion, and the second serpentine radiating portion present a symmetrical pattern.

In some embodiments, the connecting radiating portion presents a non-uniform width straight strip shape.

In some embodiments, the first meandering radiating portion surrounds a first non-conductive region, and the second meandering radiating portion surrounds a second non-conductive region.

In some embodiments, the main radiating portion exhibits an asymmetric pattern.

In some embodiments, the main radiating portion has a rectangular notch.

In some embodiments, the length of the antenna body is equal to 0.25 wavelengths of the low frequency band.

In some embodiments, the length of the embedded radiating portion is greater than 3 times the width of the antenna body.

In some embodiments, the length of the antenna body is greater than 7 times the width of the antenna body.

In some embodiments, a sum of a length of the antenna body and a length of the embedded radiating portion is equal to 0.4 times a wavelength of the low frequency band.

In some embodiments, a sum of both the length of the main radiating portion and the length of the embedded radiating portion is equal to 0.6 times the wavelength of the high frequency band.

In some embodiments, the antenna structure further comprises: a connector, wherein the cable is coupled to the antenna body and the embedded radiating portion via the connector.

In some embodiments, the antenna structure further comprises: and the antenna body is arranged inside the non-conductor antenna housing.

In another preferred embodiment, the present invention provides an antenna structure comprising: an antenna body coupled to a positive electrode of a signal source; and an embedded radiation part coupled to a cathode of the signal source; wherein the antenna structure covers a low frequency band and a high frequency band; wherein the sum of the length of the antenna body and the length of the embedded radiating part is equal to 0.4 times the wavelength of the low frequency band.

Drawings

Fig. 1 is a perspective view of a communication device according to an embodiment of the invention;

fig. 2 is an exploded view of an antenna structure according to an embodiment of the present invention;

fig. 3 is a schematic diagram of an antenna body according to an embodiment of the invention;

fig. 4A is a diagram illustrating a radiation pattern of an antenna structure operating in a low frequency band according to an embodiment of the present invention;

fig. 4B is a radiation pattern diagram of the antenna structure according to an embodiment of the invention when operating in a high frequency band;

fig. 5 is a graph of radiation efficiency of an antenna structure according to an embodiment of the present invention when operating in a low frequency band;

fig. 6 is a schematic diagram of an antenna structure according to another embodiment of the present invention;

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

Description of the symbols

100-a communication device;

110-a non-conductive shell;

120-cable wires;

121-signal conductors;

122-a ground conductor;

130. 230, 630, 730-antenna structures;

140. 240, 640, 740 to an antenna body;

150. 250, 650, 750-embedded radiating part;

190. 690-a signal source;

251 to the first end of the embedded radiation part;

252-a second end of the embedded radiating part;

255-opening holes;

260-a connector;

270-a non-conductor radome;

305-a dielectric substrate;

310-connecting radiation part;

311-first end of connecting radiation part;

312-a second end connected with the radiating part;

320-main radiation part;

321 to a first end of the main radiating part;

322 to the second end of the main radiating section;

325-rectangular gap;

330-a first serpentine radiator;

331 to a first end of the first meandering radiation section;

332 to a second end of the first serpentine radiating section;

335 — a first non-conductive region;

340 to a second meandering radiation section;

341 to a first end of the second meandering radiation section;

342 to a second end of the second serpentine radiation portion;

345 to a second non-conductive region;

CC1 — first curve;

CC 2-second curve;

CC 3-third curve;

CC 4-fourth curve;

CC 5-fifth curve;

CC 6-sixth curve;

d1-spacing;

FP-positive feed point;

FN negative feed-in point;

g1-first gap;

g2-second gap;

l1, L2, L3, L4, L5-length;

VSS to ground potential;

w1-width;

X-X axis;

Y-Y axis;

Z-Z axis;

theta 1, theta 2 and theta 3.

Detailed Description

In order to make the objects, features and advantages of the present invention comprehensible, specific embodiments accompanied with figures are described in detail below.

Certain terms are used throughout the description and following claims to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. The present specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. The term "substantially" refers to a range of acceptable error within which one skilled in the art can solve the technical problem to achieve the basic technical result. In addition, the term "coupled" is used herein to encompass any direct or indirect electrical connection. Thus, if a first device couples to a second device, that connection may be through a direct electrical connection, or through an indirect electrical connection via other devices and connections.

Fig. 1 is a perspective view illustrating a Communication Device (Communication Device)100 according to an embodiment of the invention. For example, the communication device 100 may be a Wireless Access Point (Wireless Access Point). As shown in fig. 1, the communication device 100 includes: a non-conductive Housing (non-conductive Housing)110, a Cable (Cable)120, an Antenna Structure (Antenna Structure)130, and a Signal Source 190. It should be understood that although not shown in fig. 1, the communication device 100 may also include other components, such as: a Printed Circuit Board (PCB), an Electronic Component (Electronic Component), a Connector (Connector), an Antenna Cover (Antenna Cover), a Processor (Processor), and a Power Supply Module (Power Supply Module).

The non-conductive housing 110 has a Hollow Structure (Hollow Structure) that can be used to house various components. The shape and style of the non-conductive housing 110 is not particularly limited in the present invention. For example, the non-conductive housing 110 may be a hollow cube. Cable conductor 120 is coupled to signal source 190. For example, the Cable 120 may be a Coaxial Cable (Coaxial Cable) or any other Transmission Line (Transmission Line). The cable 120 includes a signal Conductor (Signaling Conductor)121 and a ground Conductor (Grounding Conductor) 122. The Antenna structure 130 includes an Antenna Body (Antenna Body)140 and an embedded Radiation Element (embedded Radiation Element)150, wherein the Antenna Body 140 is disposed outside the non-conductive housing 110, and the embedded Radiation Element 150 is disposed inside the non-conductive housing 110. In other words, the antenna body 140 is a portion that can be directly observed by the eyes of the user, and the embedded radiating portion 150 is another portion that cannot be seen by the eyes of the user (because it is blocked by the non-conductor housing 110). The signal source 190 may be a Radio Frequency (RF) module, which may be used to excite the antenna structure 130. In some embodiments, the signal source 190 has a Positive Electrode (Positive Electrode) and a Negative Electrode (Negative Electrode), wherein the Positive Electrode of the signal source 190 is coupled to the antenna body 140 via the signal conductor 121, and the Negative Electrode of the signal source 190 is coupled to the embedded radiating portion 150 via the ground conductor 122. In other embodiments, the positive and negative poles of the signal source 190 can be reversed without affecting the efficacy of the present invention.

In some embodiments, the antenna structure 130 covers a Low-Frequency Band (Low-Frequency Band) and a High-Frequency Band (High-Frequency Band), wherein the Low-Frequency Band may be between 700MHz and 960MHz, and the High-Frequency Band may be between 1700MHz and 2700 MHz. Therefore, the antenna structure 130 can support at least the wideband operation of lte (long Term evolution). In other embodiments, the low frequency band may be between 2400MHz and 2500MHz and the high frequency band may be between 5150MHz and 5850MHz, such that the antenna structure 130 may support 2.4GHz/5GHz dual band operation of WLAN (Wireless Local Area networks).

The shape and kind of the antenna body 140 are not particularly limited in the present invention. For example, the Antenna body 140 may be a Monopole (Monopole Antenna), a Dipole Antenna (Dipole Antenna), a Patch Antenna (Patch Antenna), a Planar Inverted F Antenna (PIFA), or a Chip Antenna (Chip Antenna). The embedded radiating portion 150 can be made of a conductive material, such as: and (3) a metal material. The embedded radiating portion 150 may substantially present a straight bar shape, for example: an elongated iron member, but is not limited thereto. In other embodiments, the embedded radiating portion 150 is also modified to a serpentine shape, such as: an L-shape, a Z-shape, or a circular arc. An Angle θ 1 between the antenna body 140 and the embedded radiating portion 150 may be between 0 degree and 180 degrees, and preferably equal to 90 degrees. Generally, the embedded radiating portion 150 and the antenna body 140 may generate Resonant currents (Resonant currents) in different directions, which may correspond to different Polarization directions (Polarization directions). For example, if the antenna body 140 has a vertical polarization direction, the embedded radiating portion 150 can provide a horizontal polarization direction to compensate for the Null (Null) of the Radiation Pattern (Radiation Pattern) of the antenna body 140. In order to enhance the Coupling Effect (Coupling Effect) between the antenna body 140 and the embedded radiating portion 150, the distance D1 between the antenna body 140 and the embedded radiating portion 150 is preferably less than or equal to 3 wavelengths (3 λ) of the low frequency band of the antenna structure 130. It should be noted that the embedded radiating portion 150 can be regarded as an extension of the antenna body 140, and since the embedded radiating portion 150 is disposed inside the non-conductive housing 110, it will not increase the overall size of the antenna body 140, and at the same time, can beautify the visual appearance of the communication device 100. With this design, the antenna structure 130 including the antenna body 140 and the embedded radiating portion 150 can have at least advantages of small size, wide frequency band, and multiple polarization directions, so it is suitable for various communication devices 100.

The following embodiments will describe various detailed features of the communication device 100 and its antenna structure 130. It must be understood that these drawings and descriptions are only exemplary and are not intended to limit the scope of the present invention.

Fig. 2 is an exploded view of an antenna structure 230 according to an embodiment of the invention. In the embodiment of fig. 2, the Antenna structure 230 includes an Antenna body 240, an embedded radiating portion 250, a Connector (Connector)260, and a non-conductive Antenna Cover (non-conductive Antenna Cover) 270. The Antenna body 240 may be classified as a Folded Dipole Antenna (Folded Dipole Antenna), which will be described in detail in the embodiment of fig. 3. The embedded radiating portion 250 may substantially exhibit a straight strip shape. The embedded radiating portion 250 has a first End 251 and a second End 252, wherein an Opening 255 is formed at the first End 251 of the embedded radiating portion 250, and the second End 252 of the embedded radiating portion 250 is an Open End. The cable 120 may pass through the opening 255 of the embedded radiating portion 250 to simplify the associated assembly process. For example, the opening 255 of the embedded radiating portion 250 may generally exhibit a circular shape, an elliptical shape, a triangular shape, or a square shape. In other embodiments, the opening 255 of the embedded radiating portion 250 may be filled with a conductive material. The connector 260 may be of any variety, for example: an SMA (miniature version A) connector, but is not limited thereto. The signal conductor 121 of the cable 120 may be coupled to the antenna body 140 through a signal Portion (Signaling Portion) of the connector 260, and the ground conductor 122 of the cable 120 may be coupled to the embedded radiator 250 (not shown) through a ground Portion (Grounding Portion) of the connector 260. Similarly, an included angle θ 2 between the embedded radiating portion 250 and the antenna body 240 (or the connector 260) may be between 0 degree and 180 degrees, and preferably may be equal to 90 degrees. The non-conductor radome 270 may have a bottom opening and a hollow portion associated therewith. The antenna body 240 may be disposed inside the non-conductor radome 270, wherein the non-conductor radome 270 may be used to provide Waterproof (Waterproof) and Dustproof (dutpprof) functions so as to protect the antenna body 240 from being damaged. It should be understood that the connector 260 and the non-conductive radome 270 are Optional elements (Optional elements) and may be removed in other embodiments.

Fig. 3 is a schematic diagram illustrating an antenna body 240 according to an embodiment of the invention. The antenna body 240 may be disposed on a Dielectric Substrate (Dielectric Substrate)305, for example: a FR4 (film resistor 4) substrate or a Flexible Circuit Board (FPC). In the embodiment of fig. 3, the antenna body 240 includes a Connection Radiation Element (Connection Radiation Element)310, a Main Radiation Element (Main Radiation Element)320, a first Radiation Element (forming Radiation Element)330, and a second Radiation Element 340. The connecting radiating portion 310 may substantially exhibit a non-uniform width straight bar shape. The connecting radiation portion 310 has a first end 311 and a second end 312, wherein the width of the first end 311 is greater than the width of the second end 312, so as to fine tune the feeding Impedance Matching (Impedance Matching) of the antenna body 240. The first end 311 of the connecting radiation portion 310 is coupled to a Positive Feeding Point (FP), wherein the Positive Feeding Point FP is further coupled to the signal conductor 121 of the cable 120. The main radiating portion 320 may exhibit an asymmetric pattern. The main radiating portion 320 has a first end 321 and a second end 322, wherein the first end 321 of the main radiating portion 320 is coupled to the second end 312 of the connecting radiating portion 310, and the second end 322 of the main radiating portion 320 is an open end and may substantially form an arc shape. A rectangular Notch 325 is formed at one side (e.g., the right side) of the main radiating portion 320, which can be used to fine tune the high frequency impedance matching of the antenna body 240. The three of the connection radiation portion 310, the first serpentine radiation portion 330, and the second serpentine radiation portion 340 may present a symmetrical pattern, in which the connection radiation portion 310 is interposed between the first serpentine radiation portion 330 and the second serpentine radiation portion 340. A first gap G1 is formed between the connecting radiating portion 310 and the first meandering radiating portion 330, and a second gap G2 is formed between the connecting radiating portion 310 and the second meandering radiating portion 340, so that the connecting radiating portion 310 is not directly connected to the first meandering radiating portion 330 and the second meandering radiating portion 340. The first meandering radiation portion 330 has a first end 331 and a second end 332, wherein the first end 331 of the first meandering radiation portion 330 is coupled to a Negative Feeding Point (Negative Feeding Point) FN, and the second end 332 of the first meandering radiation portion 330 is an open end. The second meandering radiation portion 340 has a first end 341 and a second end 342, wherein the first end 341 of the second meandering radiation portion 340 is coupled to the negative feed point FN, and the second end 342 of the second meandering radiation portion 340 is an open end. The second end 332 of the first serpentine radiation portion 330 and the second end 342 of the second serpentine radiation portion 340 may extend in substantially the same direction. The negative feed point FN may also be coupled to the embedded radiating portion 250 and the ground conductor 122 of the cable line 120. In some embodiments, the embedded radiating portion 250 is directly coupled to the negative feed point FN without passing through the cable 120. The first meandering radiation portion 330 surrounds a first Non-conductive Region (Non-conductive Region)335, and the second meandering radiation portion 340 surrounds a second Non-conductive Region 345, wherein the first Non-conductive Region 335 and the second Non-conductive Region 345 may each substantially have a rectangular shape or a straight strip shape, and they may be substantially parallel to each other. The structural design of the first meandering radiation section 330 and the second meandering radiation section 340 can be used to shrink the overall size of the antenna body 240.

In some embodiments, the antenna structure 230 covers a low frequency band and a high frequency band. For example, the low frequency band may be between 700MHz and 960MHz, and the high frequency band may be between 1700MHz and 2700MHz, but is not limited thereto. In terms of antenna principle, the aforementioned low frequency band is mainly generated by the joint radiation portion 310, the main radiation portion 320, the first meandering radiation portion 330, and the second meandering radiation portion 340, and the aforementioned high frequency band is mainly generated by the main radiation portion 320. According to the actual measurement result, the embedded radiating portion 250 has a relatively large Current Density (Current Density) in both the low frequency band and the high frequency band. In other words, the embedded radiating portion 250 can be used to guide the low frequency resonant current and the high frequency resonant current simultaneously, so as to provide different polarization directions and eliminate the null point of the radiation field pattern. Therefore, the radiation performance of the antenna structure 230 using the embedded radiation portion 250 can be greatly improved.

In some embodiments, the element dimensions of the antenna structure 230 may be as follows. The length L1 of the antenna body 240 may be substantially equal to 0.25 wavelengths of the low frequency band of the antenna structure 230 (L1 ═ 0.25 λ). The length L2 of the embedded radiating part 250 may be more than 3 times (L2: W1> 3: 1) greater than the width W1 of the antenna body 240. The length L1 of the antenna body 240 may be greater than 7 times the width W1 of the antenna body 240 (L1: W1> 7: 1). The sum of the length L1 of the antenna body 240 and the length L2 of the embedded radiating portion 250 may be substantially equal to 0.4 times the wavelength of the low frequency band of the antenna structure 230 (L1+ L2 ═ 0.4 λ). The sum of the length L3 of the main radiating portion 320 and the length L2 of the embedded radiating portion 250 may be substantially equal to 0.6 times the wavelength of the high frequency band of the antenna structure 230 (L2+ L3 ═ 0.6 λ). The first gap G1 and the second gap G2 may each have a width less than 0.5 mm. The above ranges of element sizes are derived from a number of experimental results, which help to optimize the radiation pattern and impedance matching of the antenna structure 230.

Fig. 4A is a diagram illustrating a radiation pattern of the antenna structure 230 operating in a low frequency band according to an embodiment of the invention (which can be measured along the YZ plane), wherein a first curve CC1 represents the radiation pattern of the antenna structure 230 without the embedded radiating portion 250, and a second curve CC2 represents the radiation pattern of the antenna structure 230 with the embedded radiating portion 250. According to the measurement result of fig. 4A, the addition of the embedded radiating portion 250 can increase the radiation pattern strength of the antenna structure 230 on the + Z axis by about 20dB, so that the design can eliminate the low-frequency radiation pattern zero of the antenna structure 230.

Fig. 4B is a diagram illustrating a radiation pattern of the antenna structure 230 operating in a high frequency band according to an embodiment of the invention (which can be measured along the YZ plane), wherein a third curve CC3 represents the radiation pattern of the antenna structure 230 without the embedded radiating portion 250, and a fourth curve CC4 represents the radiation pattern of the antenna structure 230 with the embedded radiating portion 250. According to the measurement result of fig. 4B, the radiation pattern strength of the antenna structure 230 on the + Z axis can be improved by about 25dB by the addition of the embedded radiation portion 250, so that the high-frequency radiation pattern zero point of the antenna structure 230 can be eliminated by this design.

Fig. 5 is a graph illustrating Radiation Efficiency (Radiation Efficiency) of the antenna structure 230 according to an embodiment of the invention, wherein a fifth curve CC5 represents the Radiation Efficiency of the antenna structure 230 without the embedded radiating portion 250, and a sixth curve CC6 represents the Radiation Efficiency of the antenna structure 230 with the embedded radiating portion 250. According to the measurement results shown in fig. 5, the radiation efficiency of the antenna structure 230 can be increased by about 30% by adding the embedded radiation portion 250, so that the overall communication quality can be greatly improved.

Fig. 6 is a diagram illustrating an antenna structure 630 according to another embodiment of the invention. In the embodiment of fig. 6, the antenna structure 630 includes an antenna body 640 and an embedded radiating portion 650, wherein the antenna body 640 is directly coupled to an anode of a signal source 690, and the embedded radiating portion 650 is directly coupled to a cathode of the signal source 690. The antenna structure 630 may cover a low frequency band and a high frequency band. The sum of the length L4 of the antenna body 640 and the length L5 of the embedded radiating portion 650 is equal to 0.4 times the wavelength of the low frequency band of the antenna structure 630 (L4+ L5 ═ 0.4 λ). In addition, an included angle θ 3 between the antenna body 640 and the embedded radiating portion 650 may be substantially equal to 30 degrees, 45 degrees, 75 degrees, or other angles, not limited to 90 degrees. According to the actual measurement results, even if cable 120 is omitted, it does not negatively affect the radiation performance of antenna structure 630. The remaining features of the antenna structure 630 of fig. 6 are similar to those of the antenna structure 230 of fig. 2, so that similar operation can be achieved in both embodiments.

Fig. 7 is a diagram illustrating an antenna structure 730 according to another embodiment of the invention. In the embodiment of fig. 7, the antenna structure 730 includes an antenna body 740 and an embedded radiating portion 750, wherein one end of the embedded radiating portion 750 is coupled to a ground potential VSS. According to the actual measurement result, the embedded radiating portion 750 can provide different polarization directions to the antenna body 740 no matter whether it is coupled to the ground potential VSS, so that the antenna structure 730 can have an approximately Omnidirectional (omni) radiation pattern. The remaining features of the antenna structure 730 of fig. 7 are similar to those of the antenna structure 230 of fig. 2, so that similar operation can be achieved in both embodiments.

The invention provides a novel communication device and an antenna structure. Compared with the conventional design, the invention has the advantages of small size, multi-polarization direction, nearly omnidirectional radiation field pattern and the like. Therefore, the present invention is suitable for various indoor environments to overcome the problem of poor communication quality caused by signal reflection and multipath fading.

It is noted that the sizes, shapes, and frequency ranges of the above-described elements are not limitations of the present invention. The antenna designer can adjust these settings according to different needs. The communication device and the antenna structure of the present invention are not limited to the states illustrated in fig. 1 to 7. The present invention may include only any one or more features of any one or more of the embodiments of figures 1-1. In other words, not all illustrated features may be required to implement the communication device and antenna structure of the present invention.

Ordinal numbers such as "first," "second," "third," etc., in the specification and claims are not necessarily in sequential order, but are merely used to identify two different elements having the same name.

Although the present invention has been described in connection with the preferred embodiments, it is not intended to limit the scope of the invention, and one skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention.

Claims

1. A communication device, comprising:

a non-conductor housing having a hollow structure;

a signal source;

a cable wire coupled to the signal source and including a signal conductor and a ground conductor; and

an antenna structure comprising:

an antenna body coupled to the signal conductor, wherein the antenna body is disposed outside the non-conductive housing, wherein the antenna body comprises:

a connecting radiation part coupled to a positive feed point;

a main radiation part coupled to the connection radiation part;

a first meandering radiation part coupled to a negative feed point; and

a second meandering radiation portion coupled to the negative feed point;

wherein the connecting radiation portion is interposed between the first meandering radiation portion and the second meandering radiation portion; and

an embedded radiating portion coupled to the ground conductor, wherein the embedded radiating portion is disposed inside the non-conductive housing.

2. The communication device of claim 1, wherein the embedded radiating portion has a straight strip shape.

3. The communication device according to claim 1, wherein an angle between the antenna body and the embedded radiating portion is between 0 degree and 180 degrees.

4. The communication device of claim 1, wherein the antenna structure covers a low frequency band and a high frequency band, the low frequency band is between 700MHz and 960MHz, and the high frequency band is between 1700MHz and 2700 MHz.

5. The communication device of claim 1 wherein the antenna body is classified as a folded dipole antenna.

6. The communication device according to claim 4, wherein the distance between the antenna body and the embedded radiating portion is less than or equal to 3 wavelengths of the low frequency band.

7. The communication device according to claim 1, wherein the connecting radiating portion, the first meandering radiating portion, and the second meandering radiating portion exhibit a symmetrical pattern.

8. The communication device according to claim 1, wherein the connecting radiating portion has a shape of a straight bar with different widths.

9. The communication device according to claim 1, wherein the first meandering radiating portion surrounds a first non-conductive area, and the second meandering radiating portion surrounds a second non-conductive area.

10. The communication device of claim 1, wherein the main radiating portion exhibits an asymmetric pattern.

11. The communication device of claim 1, wherein the main radiating portion has a rectangular notch.

12. The communication device as claimed in claim 4, wherein the length of the antenna body is equal to 0.25 times the wavelength of the low frequency band.

13. The communication device according to claim 1, wherein the length of the embedded radiating portion is greater than 3 times the width of the antenna body.

14. The communication device of claim 1, wherein the length of the antenna body is greater than 7 times the width of the antenna body.

15. The communication device according to claim 4, wherein a sum of a length of the antenna body and a length of the embedded radiating portion is equal to 0.4 times a wavelength of the low frequency band.

16. The communication device according to claim 4, wherein a sum of a length of the main radiating portion and a length of the embedded radiating portion is equal to 0.6 times a wavelength of the high frequency band.

17. The communication device of claim 1, wherein the antenna structure further comprises:

a connector, wherein the cable is coupled to the antenna body and the embedded radiating portion via the connector.

18. The communication device of claim 1, wherein the antenna structure further comprises:

a non-conductor radome, wherein the antenna body is disposed inside the non-conductor radome.

19. An antenna structure, comprising:

an antenna body coupled to a positive electrode of a signal source, wherein the antenna body comprises:

a connecting radiation part coupled to a positive feed point;

a main radiation part coupled to the connection radiation part;

a first meandering radiation part coupled to a negative feed point; and

a second meandering radiation portion coupled to the negative feed point;

an embedded radiation part coupled to the negative electrode of the signal source;

wherein the antenna structure covers a low frequency band and a high frequency band;

wherein the sum of the length of the antenna body and the length of the embedded radiating part is equal to 0.4 times the wavelength of the low frequency band.