Dual-band co-axial mobile phone antenna based on slot and loop structure

Abstract

The application relates to the technical field of antennas, and provides a dual-band common-aperture mobile phone antenna based on a slot and a loop structure, which comprises a mobile phone medium bottom plate, metal side plates arranged on both sides of the mobile phone medium bottom plate, a plurality of open loop structures with branches arranged on each metal side plate in sequence, loop-shaped directors corresponding to the open loop structures, a feeding point, a slot on the metal side plate of the mobile phone, and a feeding microstrip across the short side of the slot; the feeding point is located in the branch of the open loop structure, and the loop-shaped director and the open loop structure are located on the two sides of the metal side plate respectively. The application utilizes the common-aperture design of the loop antenna and the slot antenna, realizes the dual-band common-aperture antenna of 24.7GHz and 3GHz, expands the antenna frequency band matching, and can be used for the high-gain millimeter wave loop antenna and the low-frequency slot antenna of the mobile phone terminal structure which is simpler, compared with the prior art, the structure is compact and simple, easy to manufacture, effectively utilizes the space, and has good effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of antenna, in particular to a dual-band co-aperture mobile phone antenna based on slot and loop structure. BACKGROUND

[0002] The general structure of the co-aperture antenna is that multiple antennas with different frequency bands are integrated under one aperture, and by selecting appropriate antenna unit structure, designing a superior feed network and arranging a reasonable overall framework, the mutual interference between multiple antennas is reduced, so that the performance of each part of the co-aperture antenna when they coexist is consistent with the performance when they exist alone, and finally the multiple antennas with different functions can work independently and completely. Common antenna types such as microstrip antenna, symmetrical dipole, waveguide slot, spiral antenna and horn antenna can be used as the unit structure of the co-aperture antenna.

[0003] The dual-frequency technology requires gradual improvement in the field of mobile phone communication, and the integration of two technologies to form a dual-frequency antenna is an important direction of development in the field of modern mobile phone communication. Developing an antenna with a large bandwidth in dual frequency and a large isolation in dual polarization is one of the key technologies and a hot spot in the research of mobile phone antennas.

[0004] With the continuous development of the economy and society, people begin to expect mobile communication systems to have lower latency, faster data transmission rate and higher reliability. Millimeter wave antenna is one of the core modules of current and future radio frequency systems, and its performance determines the communication quality. However, the inherent disadvantages of millimeter wave, such as large propagation loss, short transmission distance and weak anti-interference ability, have always limited the development of millimeter wave antenna technology, and at the same time, the limited space of mobile terminals also puts higher requirements on the size of the antenna.

[0005] In view of the above problems, it is urgent to design a new mobile phone antenna to meet the actual needs. SUMMARY

[0006] In view of the defects in the prior art, the purpose of the present application is to provide a dual-band co-aperture mobile phone antenna based on slot and loop structure.

[0007] According to the dual-band co-aperture mobile phone antenna based on slot and loop structure provided by the present application, the antenna comprises a mobile phone dielectric bottom plate, metal side plates arranged on both sides of the mobile phone dielectric bottom plate, a plurality of open loop structures with branches arranged in sequence on each metal side plate, a loop director corresponding to each open loop structure, a feed point, a slot on the mobile phone metal side plate, and a feed microstrip across the short side of the slot.

[0008] The feeding point is located in the branch of the open loop structure, the loop director and the open loop structure are located at two sides of the metal side plate respectively, and the antenna structure on the two metal side plates is mirror image, thereby forming a complete antenna structure on the mobile phone.

[0009] Preferably, the open loop structure works and radiates electromagnetic waves to the periphery after the feeding point feeds, and the loop director guides the propagation of the radiated electromagnetic waves.

[0010] The slot antenna works after the feeding microstrip feeds.

[0011] Preferably, the open loop structure and the loop director are coaxially arranged.

[0012] Preferably, the open loop structure and the slot are located at two sides of the feeding microstrip respectively.

[0013] Preferably, the inner diameter of the open loop structure is 1.5mm, the outer diameter is 1.7mm, the opening width is 0.1mm, and the distance between the loop structures is 5.1mm; the branch is connected at the opening, the width of the branch is 0.2mm, and the length of the branch is 0.6mm.

[0014] Preferably, the number of the open loop structure and the loop director is 4, and 4 feeding units are formed.

[0015] Preferably, the distance between every two adjacent two feeding units is 5.1mm, the inner diameter of the loop director is 1.1mm, the outer diameter is 1.25mm, and the distance between the loop director and the open loop structure is the thickness of the metal side plate, which is 0.787mm.

[0016] Preferably, the bottom end of the feeding point is at the same height as the lower edge of the branch, the length of the feeding patch is 0.2mm, and the width is 0.1mm.

[0017] Preferably, the slot is located on the outside of the metal side plate and is cut by the metal side plate.

[0018] Preferably, the length of the slot is 62.9mm, the width is 6.213mm, the length of the feeding microstrip is 6.213mm, and the width is 0.4mm.

[0019] Compared with the prior art, the present application has the following beneficial effects:

[0020] The present application uses the loop antenna and the slot antenna for co-caliber design, realizes the 24.7GHz and 3GHz dual-band co-caliber antenna, expands the antenna frequency band matching, and can be used for the high-gain millimeter wave loop antenna and the low-frequency slot antenna with simpler mobile terminal structure, compared with the prior art, the structure is compact and simple, easy to manufacture, effectively utilizes the space and has good effect. Attached Figure Description

[0021] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0022] Figure 1 This is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is a side view of the present invention;

[0024] Figure 3 The S11 parameters of the dual-band common-aperture mobile phone antenna in this invention at 24.7GHz;

[0025] Figure 4 The radiation pattern of the dual-band common-aperture mobile phone antenna in this invention at 24.7 GHz is shown in the yoz plane.

[0026] Figure 5 The radiation pattern of the dual-band common-aperture mobile phone antenna in this invention at 24.7 GHz is shown in the xoy plane.

[0027] Figure 6 The S11 parameters of the dual-band common-aperture mobile phone antenna in this invention at 3GHz;

[0028] Figure 7 This is the radiation pattern of the dual-band common-aperture mobile phone antenna in the present invention at 3GHz in the yoz plane;

[0029] Figure 8 This is the radiation pattern of the dual-band common-aperture mobile phone antenna in the present invention at 3GHz in the xoy plane;

[0030] Figure 9 This is a three-dimensional radiation diagram of the dual-band common-aperture mobile phone antenna in this invention at 3GHz.

[0031] The diagram shows:

[0032] Mobile phone media substrate 1

[0033] Metal side panel 2

[0034] Open ring structure 3

[0035] Ring Director 4

[0036] Feed point 5

[0037] Gap 6

[0038] Feed microstrip 7 Detailed Implementation

[0039] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0040] Example 1:

[0041] This invention provides a dual-band common-aperture mobile phone antenna based on a slot and loop structure, such as... Figure 1 , Figure 2 As shown, the device includes a mobile phone dielectric substrate 1, metal side plates 2 arranged on both sides of the mobile phone dielectric substrate 1, multiple open-loop structures 3 with branches arranged sequentially on each metal side plate 2, ring directors 4 corresponding to the open-loop structures 3, feed points 5, slots 6 located on the metal side plates 2 of the mobile phone, and feed microstrips 7 bridging the short sides of the slots 6. The mobile phone dielectric substrate 1 and the metal side plates 2 on both sides together constitute the mobile phone model. The slots 6 are located on the outside of the metal side plates 2 and are preferably cut from the metal side plates 2. The open-loop structures 3 and the slots 6 are located on both sides of the feed microstrips 7, respectively. The feed points 5 are located in the branches of the open-loop structures 3. The ring directors 4 and the open-loop structures 3 are located on both sides of the metal side plates 2, respectively. The open-loop structures 3 and the ring directors 4 are preferably arranged coaxially. The antenna structures on the two metal side plates 2 exist in mirror image, thus forming a complete antenna structure on the mobile phone.

[0042] When the feed point 5 is fed, the open-loop structure 3 works and radiates electromagnetic waves to the surrounding area. The ring director 4 guides the propagation of the radiated electromagnetic waves. Specifically, the number of open-loop structures 3 and ring directors 4 is preferably 4. The 4 open-loop structures 3 and ring directors 4 together form 4 feed units. The 4 identical open-loop structures 3 with branches serve as the main structure of the ring antenna. When the ring antenna is working, due to the action of the ring director 4, the generated electromagnetic waves are directed to one side for radiation.

[0043] When the microstrip 7 is fed, the slot 6 antenna operates, which is the low-frequency mode of the common-aperture antenna. Generally, the area occupied by one antenna in a given location is much smaller than the aperture area occupied by another antenna. Due to the significant size difference or a reasonable spatial arrangement, the impact of the antenna in that location on existing antennas or antenna arrays can be ignored, thus achieving the goal of two antennas sharing the same aperture. This invention has a compact structure and utilizes limited and efficient space to design a common-aperture antenna, overcoming to some extent the performance degradation caused by antenna coupling.

[0044] Example 2:

[0045] This embodiment is a preferred example of Embodiment 1.

[0046] In this embodiment, the spatial rectangular coordinate system o-xyz includes: origin o, x-axis, y-axis, and z-axis. The dual-band common-aperture mobile phone antenna based on the slot and ring structure is parallel to the yoz plane of the spatial rectangular coordinate system. Specifically, the ring antenna is located on the opposite side of the slot antenna. The inner diameter of the open ring structure 3 is 1.5mm, the outer diameter is 1.7mm, the opening width is 0.1mm, and the distance between two adjacent open ring structures 3 is 5.1mm. The opening of the open ring structure 3 is connected to a stub, the stub width is 0.2mm, and the stub length is 0.6mm.

[0047] The distance between any two adjacent feed units is 5.1 mm. The inner diameter of the ring director 4 is 1.1 mm and the outer diameter is 1.25 mm. The distance between the ring director 4 and the open ring structure 3 is 0.787 mm, which is the thickness of the metal side plate 2. The lower edge of the feed point 5 is at the same height as the lower edge of the stub. The feed patch is 0.2 mm long and 0.1 mm wide. The slot 6 antenna structure is located outside the metal side plate 2. The slot 6 is 62.9 mm long and 6.213 mm wide. The feed microstrip 7 is 6.213 mm long and 0.4 mm wide.

[0048] The working principle of this invention is as follows:

[0049] The open-loop structure 3 is fed through the feed point 5, and the open-loop structure 3 begins to radiate electromagnetic waves to the surrounding area. After passing through the ring director 4, the radiated electromagnetic waves are guided to propagate in a certain direction, and the feed source gain is increased and the feed source bandwidth is widened. After the slot 6 is fed through the feed microstrip 7, the slot antenna is excited to work and two low-frequency resonant points are generated.

[0050] like Figure 3 The S11 parameters of open ring structure 3 are shown below. Figure 4 The radiation pattern of the open-ring structure 3 in the yoz plane at 24.7 GHz is shown. Figure 5 The radiation pattern of the open-loop structure 3 in the xoy plane at 24.7 GHz; Figure 6 The figure shows the S11 parameters of the slot antenna structure. Figure 7 The image shows the radiation pattern of the slot antenna structure in the yoz plane at 3 GHz. Figure 8 The antenna radiation pattern in the xoy plane at 3 GHz. Figure 9 The image shows the three-dimensional radiation pattern of the antenna at 3 GHz. Based on the above tests, the dual-band common-aperture mobile phone antenna based on slot and loop structures in this invention exhibits superior gain and polarization performance. The shared-aperture design of the loop antenna and slot antenna achieves a dual-band common-aperture antenna for both 24.7 GHz and 3 GHz, expanding the antenna frequency band options.

[0051] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like refer to the orientation or positional relationship shown in the drawings, and are only intended to facilitate the description of the present application and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0052] The specific embodiments of the present application are described above. It should be understood that the present application is not limited to the above specific embodiments, and various changes or modifications can be made by those skilled in the art within the scope of the claims, which do not affect the essential content of the present application. The embodiments of the present application and the features in the embodiments can be arbitrarily combined with each other without conflict, provided that they do not conflict.

Claims

1. A dual-band common-aperture mobile phone antenna based on a slot and ring structure, characterized in that, It includes a mobile phone substrate (1), metal side plates (2) arranged on both sides of the mobile phone substrate (1), a plurality of open ring structures (3) with branches arranged sequentially on each of the metal side plates (2), a ring director (4) corresponding to each of the open ring structures (3), a feed point (5), a gap (6) located on the mobile phone metal side plate (2), and a feed microstrip (7) bridging the short side of the gap (6). The feed point (5) is located in the branch of the open ring structure (3). The ring director (4) and the open ring structure (3) are located on both sides of the metal side plate (2). The antenna structures on the two metal side plates (2) are mirror images of each other, thus forming a complete antenna structure on the mobile phone. When the feed point (5) is powered, the open ring structure (3) works and radiates electromagnetic waves to the surrounding area, and the ring director (4) guides the propagation of the radiated electromagnetic waves. When the feed microstrip (7) is fed, the slot (6) functions as an antenna.

2. The dual-band common-aperture mobile phone antenna based on a slot and ring structure according to claim 1, characterized in that, The open ring structure (3) and the annular guide (4) are arranged coaxially.

3. The dual-band common-aperture mobile phone antenna based on a slot and ring structure according to claim 1, characterized in that, The open ring structure (3) and the gap (6) are located on both sides of the feed microstrip (7).

4. The dual-band common-aperture mobile phone antenna based on a slot and ring structure according to claim 1, characterized in that, The inner diameter of the open ring structure (3) is 1.5 mm, the outer diameter is 1.7 mm, the opening width is 0.1 mm, and the distance between the ring structures is 5.1 mm; the opening is connected to a branch, the branch width is 0.2 mm, and the branch length is 0.6 mm.

5. The dual-band common-aperture mobile phone antenna based on a slot and ring structure according to claim 1, characterized in that, The number of open ring structures (3) and ring directors (4) are both 4, and together they form 4 power supply units.

6. The dual-band common-aperture mobile phone antenna based on a slot and ring structure according to claim 5, characterized in that, The distance between any two adjacent feeder units is 5.1 mm. The inner diameter of the annular director (4) is 1.1 mm and the outer diameter is 1.25 mm. The distance between the annular director (4) and the open ring structure (3) is 0.787 mm, which is the thickness of the metal side plate (2).

7. The dual-band common-aperture mobile phone antenna based on a slot and ring structure according to claim 1, characterized in that, The bottom of the power supply point (5) is at the same height as the bottom edge of the branch, and the length of the power supply patch is 0.2 mm and the width is 0.1 mm.

8. The dual-band common-aperture mobile phone antenna based on a slot and ring structure according to claim 1, characterized in that, The gap (6) is located on the outside of the metal side plate (2) and is created by cutting the metal side plate (2).

9. The dual-band common-aperture mobile phone antenna based on a slot and ring structure according to claim 8, characterized in that, The gap (6) has a length of 62.9 mm and a width of 6.213 mm, and the feed microstrip (7) has a length of 6.213 mm and a width of 0.4 mm.

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