Coupled multi-band antenna

Abstract

The utility model provides a coupled multi-band antenna, comprising a dielectric plate having a front surface and a back surface; the feed-in part is arranged on the front surface of the dielectric plate; the system ground plane is arranged on the reverse side of the dielectric plate and is connected with one end of the feed-in part; the first radiation arm, the second radiation arm, the third radiation arm and the fourth radiation arm are all arranged on the front face of the dielectric plate, the first radiation arm and the fourth radiation arm are connected to the system grounding face through via holes, and the second radiation arm and the third radiation arm are electrically connected to the other end of the feed-in part. According to the utility model, a plurality of frequency bands can be integrated and supported in a compact antenna structure, the size of the antenna is reduced, the miniaturization design of terminal equipment is facilitated, and the antenna cost can be effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to wireless communication technical field especially relates to a coupling type multi -band antenna. BACKGROUND

[0002] With the development of wireless communication technology, the demand of terminal equipment for antenna has turned from single frequency band to multi -band support, for example, the equipment such as smart phone and tablet computer not only need to support global navigation satellite system GNSS_L1 frequency band, but also need to be compatible with WLAN2.4GHz, 5.5GHz and 7.125GHz and multiple frequency bands, and the traditional single -frequency band or double -frequency band antenna is difficult to realize the support to multiple frequency bands in the compact space, leads to the antenna volume to be large, influences the miniaturization design of terminal equipment, and then cannot effectively reduce the antenna cost. SUMMARY

[0003] The utility model embodiment provides a coupling type multi -band antenna can be integrated in compact antenna structure and support multiple frequency bands, reduce the antenna volume, facilitate the miniaturization design of terminal equipment, and then can effectively reduce the antenna cost.

[0004] To achieve the above object, the utility model embodiment provides a coupling type multi -band antenna, including: dielectric plate has front and back, feed-in part is set up in the front of dielectric plate, system ground plane is set up in the back of dielectric plate, and one end of feed-in part is connected with system ground plane, first radiating arm, second radiating arm, third radiating arm and fourth radiating arm are all set up in the front of dielectric plate, wherein first radiating arm and fourth radiating arm are connected to system ground plane through via, and second radiating arm and third radiating arm are electrically connected to the other end of feed-in part.

[0005] In some embodiments, the feed-in part is L-shaped microstrip line, and one end of the L-shaped microstrip line is connected with the system ground plane along the side of the dielectric plate.

[0006] In some embodiments, the first radiating arm, the second radiating arm, the third radiating arm and the fourth radiating arm are all L-shaped radiating arms, and the first radiating arm, the third radiating arm, the second radiating arm and the fourth radiating arm are sequentially arranged on the front of the dielectric plate from left to right.

[0007] In some embodiments, the dielectric plate includes a first plate and a second plate, the first radiating arm, the second radiating arm, the third radiating arm and the fourth radiating arm are all arranged on the front of the first plate, the feed-in part is arranged on the front of the second plate, and the system ground plane is arranged on the back of the second plate.

[0008] In some embodiments, the L-shaped radiation arm comprises a first segment and a second segment connected perpendicularly, the first segments of the first, second, third and fourth radiation arms are vertically arranged, the second segments are horizontally arranged, and the second segments are directed towards the right side of the medium plate.

[0009] In some embodiments, the first segment of the first radiation arm is adjacent to the left edge of the medium plate, and the second segment is adjacent to the upper edge of the medium plate; the first segment of the second radiation arm is connected to the feed-in part, the second segment is partially adjacent to the upper edge of the first plate, and the middle of the second segment is connected to a tuning rectangular block; the first segment of the third radiation arm is located to the right of the first radiation arm, and the second segment is connected to the third radiation arm; the first segment of the fourth radiation arm is located to the right of the third radiation arm; wherein the lengths of the first, second, third and fourth radiation arms are shortened in turn.

[0010] In some embodiments, the feed-in part, the first, second and third radiation arms are used to collectively excite to generate a first frequency band, and the first frequency band is between 1560-1605 MHz.

[0011] In some embodiments, the feed-in part and the second radiation arm are used to collectively excite to generate a second frequency band, and the second frequency band is between 2400-2500 MHz.

[0012] In some embodiments, the feed-in part and the third radiation arm are used to collectively excite to generate a third frequency band, and the third frequency band is between 5150-5850 MHz.

[0013] In some embodiments, the feed-in part, the second and fourth radiation arms are used to collectively excite to generate a fourth frequency band, and the fourth frequency band is between 5925-7125 MHz.

[0014] The utility model discloses an embodiment provides a kind of coupled multi-band antenna, at least have following beneficial effect: coupled multi-band antenna is arranged feed-in portion and system ground plane by utilizing the front and back of medium plate, and four radiation arms are reasonably configured in front, not only realize the effective coverage of GNSSL1, WLAN2.4GHz, 5.5GHz and 7.125GHz etc. frequency band, it can also effectively reduce the overall volume of antenna, facilitate the miniaturization design of terminal equipment, can effectively reduce antenna cost, so it is suitable for application in portable terminal equipment such as mobile phone and tablet computer;Wherein, it can be understood in the utility model, feed-in portion, first radiation arm, second radiation arm, third radiation arm and fourth radiation arm are all set in the front of medium plate can maximize the space of front for the support of multi-band, system ground plane is set in the back of medium plate, and it is connected with the one end of feed-in portion, to effectively isolate the functional area of front and back, first radiation arm and fourth radiation arm are connected to system ground plane by via, so that radiation arm can realize electrical connection between different layers by via, keep the compactness of antenna structure;Further, second radiation arm and third radiation arm are electrically connected to the other end of feed-in portion, and these radiation arms are coupled with first and fourth radiation arms by space configuration, and coupling effect can enhance the signal strength of specific frequency band, while allowing the signal of different frequency bands to coexist in the same structure, so that antenna can support multiple frequency bands without increasing physical size;Further, the size and position of each component in the design, such as feed-in portion, radiation arm etc. can be adjusted according to actual demand, to adjust the impedance matching and frequency response of antenna, ensure the performance in compact design. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the front view schematic drawing of coupled multi-band antenna provided by an embodiment;

[0016] Figure 2 It is the back view schematic drawing of coupled multi-band antenna provided by an embodiment;

[0017] Figure 3 It is the overall structure schematic drawing of coupled multi-band antenna provided by an embodiment;

[0018] Figure 4 It is the perspective schematic drawing of coupled multi-band antenna provided by an embodiment;

[0019] Figure 5 It is the perspective schematic drawing of coupled multi-band antenna provided by an embodiment, hides the medium plate behind;

[0020] Figure 6 It is the radiation efficiency schematic drawing of coupled multi-band antenna provided by an embodiment;

[0021] Figure 7A voltage standing wave ratio test diagram of the coupled multi-band antenna is provided in an embodiment.

[0022] 100, coupled multi-band antenna; 200, dielectric plate; 300, system ground plane; 400, feed-in part; 500, first radiating arm; 600, second radiating arm; 700, third radiating arm; 800, fourth radiating arm. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0024] In some embodiments, the terms first, second, and the like in the description and claims and the above drawings are used to distinguish similar objects and do not necessarily describe a specific order or sequence.

[0025] In addition, unless otherwise explicitly specified and limited, the term "connection / connected" should be interpreted broadly, for example, it can be a fixed connection or a movable connection, or a detachable connection or a non-detachable connection, or an integral connection; it can be a mechanical connection, or an electrical connection or can communicate with each other; it can be connected, or indirectly connected through an intermediate medium.

[0026] In the description of the embodiments of the present application, the description of the terms "one embodiment / implementation", "another embodiment / implementation", or "some embodiments / implementation", "in the above-described embodiment / implementation" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are contained in at least two embodiments or implementations disclosed in the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or implementation.

[0027] Currently, with the development of wireless communication technology, the demand for antennas by terminal devices has shifted from single frequency band to multi-band support. For example, devices such as smart phones and tablets not only need to support the Global Navigation Satellite System (GNSS) L1 frequency band, but also need to be compatible with multiple frequency bands such as WLAN 2.4GHz, 5.5GHz and 7.125GHz. Traditional single-band or dual-band antennas are difficult to support multiple frequency bands in a compact space, resulting in a large antenna size, affecting the miniaturization design of terminal devices, and thus unable to effectively reduce the cost of the antenna.

[0028] Therefore, the embodiments of the present application provide a coupled multi-band antenna which can integrate support for multiple frequency bands in a compact antenna structure, reduce the size of the antenna, facilitate the miniaturization design of terminal devices, and thus effectively reduce the cost of the antenna.

[0029] The embodiments of the present application will be further described below with reference to the drawings.

[0030] Reference Figures 1 to 5 , Figure 1 is a front view of a coupled multi-band antenna provided by an embodiment; Figure 2 is a back view of a coupled multi-band antenna provided by an embodiment; Figure 3 is a schematic view of an overall structure of a coupled multi-band antenna provided by an embodiment; Figure 4 is a perspective view of a coupled multi-band antenna provided by an embodiment; Figure 5 is a perspective view of a coupled multi-band antenna provided by an embodiment, in which a hidden dielectric plate is shown.

[0031] To achieve the above object, the embodiments of the present application provide a coupled multi-band antenna 100, comprising: a dielectric plate 200 having a front surface and a back surface; a feeding portion 400 arranged on the front surface of the dielectric plate 200; a system ground plane 300 arranged on the back surface of the dielectric plate 200 and connected to one end of the feeding portion 400; a first radiation arm 500, a second radiation arm 600, a third radiation arm 700 and a fourth radiation arm 800, all arranged on the front surface of the dielectric plate 200, wherein the first radiation arm 500 and the fourth radiation arm 800 are connected to the system ground plane 300 through vias, and the second radiation arm 600 and the third radiation arm 700 are electrically connected to the other end of the feeding portion 400.

[0032] The coupled multi-band antenna 100 arranges the feeding portion 400 and the system ground plane 300 on the front surface and the back surface of the dielectric plate 200 and reasonably configures the four radiation arms on the front surface, so as to not only realize effective coverage of the frequency bands of GNSS L1, WLAN 2.4GHz, 5.5GHz and 7.125GHz, but also effectively reduce the overall volume of the antenna, facilitate miniaturized design of terminal equipment, effectively reduce the cost of the antenna, and make it suitable for application in portable terminal equipment such as mobile phones and tablet computers.

[0033] It can be understood that, in the utility model, the feed-in part 400, the first radiation arm 500, the second radiation arm 600, the third radiation arm 700 and the fourth radiation arm 800 are all arranged on the front face of the dielectric plate 200, which can maximize the use of the front face space to support multiple frequency bands, the system ground plane 300 is arranged on the back face of the dielectric plate 200 and is connected with one end of the feed-in part 400, so as to effectively isolate the functional areas of the front face and the back face, the first radiation arm 500 and the fourth radiation arm 800 are connected to the system ground plane 300 through the via hole, so that the radiation arm can realize electrical connection between different layers through the via hole, and the compactness of the antenna structure is maintained; further, the second radiation arm 600 and the third radiation arm 700 are electrically connected to the other end of the feed-in part 400, and these radiation arms are coupled with the first and fourth radiation arms 800 through spatial configuration, the coupling effect can enhance the signal strength of a specific frequency band, and meanwhile allows signals of different frequency bands to coexist in the same structure, so that the antenna can support multiple frequency bands without increasing the physical size; further, the size and position of each component such as the feed-in part 400 and the radiation arm in the design can be adjusted according to actual needs, so as to adjust the impedance matching and frequency response of the antenna and ensure the performance in the compact design.

[0034] In some embodiments, the feed-in part 400 is an L-shaped microstrip line, one end of the L-shaped microstrip line is connected with the system ground plane 300 along the side face of the dielectric plate 200, the feed-in part 400 serves as an input port of the antenna and is responsible for guiding external signals into the antenna system, one end is connected with the system ground plane 300 along the side face of the dielectric plate 200 to ensure grounding; in addition, according to different frequency band requirements, the feed-in part 400 cooperates with other radiation arms to jointly excite the required frequency band, for example, the feed-in part 400 cooperates with the second radiation arm 600 to jointly excite the WLAN_2.4GHz frequency band, cooperates with the third radiation arm 700 to jointly excite the 5.5GHz frequency band, and the like.

[0035] In some embodiments, the first radiation arm 500, the second radiation arm 600, the third radiation arm 700 and the fourth radiation arm 800 are all L-shaped radiation arms, and the first radiation arm 500, the third radiation arm 700, the second radiation arm 600 and the fourth radiation arm 800 are sequentially arranged on the front face of the dielectric plate 200 from left to right.

[0036] In some embodiments, the dielectric plate 200 comprises a first plate block and a second plate block, the first radiation arm 500, the second radiation arm 600, the third radiation arm 700 and the fourth radiation arm 800 are all arranged on the front face of the first plate block, the feed-in part 400 is arranged on the front face of the second plate block, and the system ground plane 300 is arranged on the back face of the second plate block.

[0037] In some embodiments, the L-shaped radiation arms include vertically connected first segments and second segments, the first segments of the first radiation arm 500, the second radiation arm 600, the third radiation arm 700, and the fourth radiation arm 800 are all vertically arranged, the second segments are all horizontally arranged, and the second segments all face the right side of the medium plate 200.

[0038] In some embodiments, the first segment of the first radiation arm 500 is close to the left side edge of the medium plate 200, and the second segment is close to the upper side edge of the medium plate 200; the first segment of the second radiation arm 600 is connected to the feed-in part 400, and the second segment is partially close to the upper side edge of the first plate block, and the middle part of the second segment is connected with a tuning rectangular block; the first segment of the third radiation arm 700 is located to the right of the first radiation arm 500, and the second segment is connected to the third radiation arm 700; the first segment of the fourth radiation arm 800 is located to the right of the third radiation arm 700; wherein the lengths of the first radiation arm 500, the second radiation arm 600, the third radiation arm 700, and the fourth radiation arm 800 are shortened in turn.

[0039] In some embodiments, the first segment of the first radiation arm is close to the left side edge of the medium plate, and the second segment is close to the upper side edge, which can effectively utilize the space of the medium plate and avoid interference with other components, so that it can be used to cover the GNSS_L1 frequency band; the first segment of the second radiation arm is directly connected to the feed-in part, and the tuning rectangular block is used to fine-tune the frequency response of the second radiation arm; the first segment of the third radiation arm is placed to the right of the first radiation arm to save space and avoid mutual interference with other components, and there is an electrical connection between the third radiation arm and the second radiation arm; the first segment of the fourth radiation arm is placed to the right of the third radiation arm, so that the entire antenna structure is more compact.

[0040] In addition, it can be understood that different frequency bands of antennas require different physical sizes to match the corresponding wavelengths, and lower frequency bands require longer antenna elements, while higher frequency bands require shorter antenna elements, therefore, the lengths of the first to fourth radiation arms are shortened in turn, corresponding to different frequency band requirements from low frequency to high frequency.

[0041] In some embodiments, the feed-in part 400, the first radiation arm 500, the second radiation arm 600, and the third radiation arm 700 are used to collectively excite to generate a first frequency band, the first frequency band is between 1560 and 1605 MHz; the feed-in part 400 and the second radiation arm 600 are used to collectively excite to generate a second frequency band, the second frequency band is between 2400 and 2500 MHz; the feed-in part 400 and the third radiation arm 700 are used to collectively excite to generate a third frequency band, the third frequency band is between 5150 and 5850 MHz; the feed-in part 400, the second radiation arm 600, and the fourth radiation arm 800 are used to collectively excite to generate a fourth frequency band, the fourth frequency band is between 5925 and 7125 MHz.

[0042] In some embodiments, the dielectric plate 200 can be an FR4 plate with a dielectric constant of 4.4 and a thickness of 1.0 mm; in terms of element size, the length of the system ground plane 300 is 120 mm and the width is 60 mm; the length of the microstrip line of the feed-in part 400 is 20 mm and the width is 1.7 mm; the length of the first radiation arm 500 is 28 mm, the length of the second radiation arm 600 is 21 mm, the length of the third radiation arm 700 is 12 mm, and the length of the fourth radiation arm 800 is 5 mm; it is worth noting that the above element sizes are only examples, and users can freely adjust the element sizes according to the surrounding environment and use state of the antenna.

[0043] It can be understood that the first radiation arm 500 is coupled to the second radiation arm 600 / third radiation arm 700 through spatial configuration, and the fourth radiation arm 800 is also coupled to the second radiation arm 600 / third radiation arm 700 through spatial configuration, and when the antenna is excited, the feed-in part 400 / first radiation arm 500 / second radiation arm 600 / third radiation arm 700 / fourth radiation arm 800 / system ground plane 300 combination generates GNSS_L1 / 2.4GHz / 5.5GHz / 7.125GHz multi-band resonance. It is worth noting that users can also adjust the antenna frequency by adjusting the element size, PCB thickness, and Dk value, and the frequency range is not limited to the frequency range of the utility model.

[0044] In addition, the antenna structure in the utility model can be etched on the whole machine PCB, which can further reduce the cost, and can also be realized by FPC and other materials.

[0045] In some embodiments, the feed-in part 400 adopts an L-shaped microstrip line design with a width of 1.7 mm. This design optimizes the signal transmission path, reduces signal loss, and improves impedance matching performance. One end of the L-shaped microstrip line is connected to the system ground plane 300 along the side of the dielectric plate 200, improving signal transmission efficiency.

[0046] In some embodiments, all the radiation arms are L-shaped, each composed of a first vertical segment and a second horizontal segment. This design not only saves space, but also allows each radiation arm to be independently adjusted in size and shape, so that the first radiation arm 500 is coupled to the second radiation arm 600 and the third radiation arm 700 through spatial configuration, and the fourth radiation arm 800 is also coupled to the second radiation arm 600 and the third radiation arm 700 through spatial configuration. This coupling effect can enhance the signal strength of specific frequency bands and allow signals of different frequency bands to coexist in the same structure.

[0047] The specific implementation of the frequency band coverage is as follows:

[0048] GNSSL1 band (about 1560-1605MHz): the feeding portion 400, the first radiating arm 500, the second radiating arm 600 and the third radiating arm 700 jointly excite to generate a first frequency band between 1560-1605MHz, and those skilled in the art can ensure the effective coverage of the frequency band by adjusting the length and position of the first radiating arm 500 in combination with the coupling effect of the feeding portion 400 and the second radiating arm 600 and the third radiating arm 700.

[0049] WLAN2.4GHz band (about 2400-2500MHz): the feeding portion 400 and the second radiating arm 600 jointly excite to generate a second frequency band between 2400-2500MHz, and the second radiating arm 600 can fine-tune the frequency response by the preset tuning rectangular block of the second radiating arm 600 to ensure the performance in the frequency band.

[0050] 5.5GHz band (about 5150-5850MHz): the feeding portion 400 and the third radiating arm 700 jointly excite to generate a third frequency band between 5150-5850MHz.

[0051] 7.125GHz band (about 5925-7125MHz): the feeding portion 400, the second radiating arm 600 and the fourth radiating arm 800 jointly excite to generate a fourth frequency band between 5925-7125MHz, and the fourth radiating arm 800 is connected to the system ground plane 300 through the via and is coupled with the second radiating arm 600.

[0052] In some embodiments, as shown in Figs. Figure 6 and Figure 7 , the radiation efficiency of the coupled multi-band antenna provided by an embodiment is shown in Fig. Figure 6 The abscissa of the radiation efficiency of the coupled multi-band antenna provided by an embodiment represents the antenna frequency, and the ordinate represents the radiation efficiency. Figure 6 The abscissa of the radiation efficiency of the coupled multi-band antenna provided by an embodiment represents the antenna frequency, and the ordinate represents the radiation efficiency. Figure 7 The voltage standing wave ratio test diagram of the coupled multi-band antenna provided by an embodiment is shown in Fig. Figure 7 The abscissa of the voltage standing wave ratio of the coupled multi-band antenna provided by an embodiment represents the antenna frequency, and the ordinate represents the voltage standing wave ratio, and it can be seen that the radiation efficiency of the antenna structure of the utility model in the whole frequency band is >-2.5dB, and the voltage standing wave ratio can meet the conventional demand of the mobile terminal.

[0053] Although the utility model is disclosed as above with the preferred embodiments, it is not used to limit the scope of the utility model, and any ordinary skilled person in the art can make any modification without departing from the spirit and scope of the utility model, so the protection scope of the utility model shall be subject to the scope defined by the appended claims.

Claims

1. A coupled multi-band antenna, characterized in that, include: A medium plate, having a front and a back; A feed section is provided on the front side of the dielectric plate; The system ground plane is located on the opposite side of the medium plate and is connected to one end of the feed section; The first, second, third, and fourth radiating arms are all disposed on the front side of the dielectric plate. The first and fourth radiating arms are connected to the system ground plane through vias, and the second and third radiating arms are electrically connected to the other end of the feed section.

2. The coupled multi-band antenna of claim 1, wherein, The feed section is an L-shaped microstrip line, one end of which is connected to the system ground plane along the side of the dielectric substrate.

3. The coupled multi-band antenna of claim 1, wherein, The first, second, third, and fourth radiating arms are all L-shaped radiating arms, and are arranged sequentially from left to right on the front side of the dielectric plate.

4. The coupled multi-band antenna of claim 3, wherein, The dielectric plate includes a first plate and a second plate. The first radiating arm, the second radiating arm, the third radiating arm, and the fourth radiating arm are all disposed on the front side of the first plate. The feed-in part is disposed on the front side of the second plate, and the system ground plane is disposed on the back side of the second plate.

5. The coupled multi-band antenna of claim 4, wherein, The L-shaped radiating arm includes a first section and a second section connected vertically. The first section of the first radiating arm, the second radiating arm, the third radiating arm, and the fourth radiating arm are all vertically arranged, and the second section is horizontally arranged, with the second section facing the right side of the dielectric plate.

6. The coupled multi-band antenna according to claim 5, characterized in that, The first segment of the first radiating arm is in close contact with the left edge of the dielectric plate, and the second segment is in close contact with the upper edge of the dielectric plate; The first section of the second radiating arm is connected to the feed section, the second section is closely attached to the upper edge of the first plate, and the middle of the second section is connected to a tuning rectangular block. The first segment of the third radiating arm is located to the right of the first radiating arm, and the second segment is connected to the third radiating arm; The first segment of the fourth radial arm is located to the right of the third radial arm; The lengths of the first radiating arm, the second radiating arm, the third radiating arm, and the fourth radiating arm are successively shortened.

7. The coupled multi-band antenna of claim 1, wherein, The feed unit, the first radiating arm, the second radiating arm, and the third radiating arm are used to jointly excite and generate a first frequency band, which is between 1560 and 1605 MHz.

8. The coupled multi-band antenna of claim 1, wherein, The feed section and the second radiating arm are used to jointly excite and generate a second frequency band, which is between 2400 and 2500 MHz.

9. The coupled multi-band antenna of claim 1, wherein, The feed section and the third radiating arm are used to jointly excite and generate a third frequency band, which is between 5150 and 5850 MHz.

10. The coupled multi-band antenna of claim 1, wherein, The feed section, the second radiating arm, and the fourth radiating arm are used to jointly excite and generate a fourth frequency band, which is between 5925 and 7125 MHz.

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