A three-band PIFA mobile phone antenna

Abstract

The present invention relates to the technical field of mobile phone antennas, and provides a mobile phone antenna of a three-band PIFA, comprising a mounting plate, a frequency modulation structure is arranged at the top of the mounting plate, a protective shell is arranged on the outer side of the frequency modulation structure at the top of the mounting plate, a fixing groove is evenly arranged on one side of the frequency modulation structure at the top of the mounting plate, a fixing structure is evenly arranged at the bottom of the protective shell, and mounting holes are evenly arranged at the edge position inside the mounting plate. The mobile phone antenna of the three-band PIFA provided by the present invention uses a U-shaped first empty slot and a second empty slot to achieve a small influence between each frequency band, which is relatively independent of each other, reduces the error between frequency bands, is simple to adjust, and is easy to manufacture, greatly simplifies the design process of the PIFA antenna, can be implemented on a single-layer microstrip antenna, does not require multiple patches, and is easy to process, can enable the antenna to achieve multi-frequency point operation within a limited frequency band, has potential in engineering applications, and can simultaneously achieve miniaturized design.

Description

Technical Field

[0001] The present invention relates to the technical field of mobile phone antennas, and in particular to a three-band PIFA mobile phone antenna. Background Art

[0002] Multi-band antennas are an indispensable part of modern wireless communication systems. They are increasingly important in supporting various communication standards, optimizing space utilization, improving performance, and coping with spectrum resource shortages. With the advancement of science and technology, their application areas and technical levels will continue to develop. PIFA antennas, or planar inverted F-shaped antennas, are named because the shape of the entire antenna resembles an inverted English letter F.

[0003] There are several methods to realize multi-band of mobile phone antenna, such as mode orthogonality method, multi-patch method, lumped element loading, slot loading method and parasitic unit method. Mode orthogonality method is only applicable to dual-band design and difficult to realize for multi-band design. Although multi-patch method and lumped element method can realize multi-band operation, their structure is relatively complex and prone to large errors, which is not conducive to miniaturization design. Parasitic unit method realizes multi-band design and is suitable for the situation that the frequency bands are close. For the three frequency bands of GSM900 / DCS1800 / ISM2450MHz, the frequency bands are ≥500MHz apart. Therefore, it is difficult to realize by using this method. Moreover, the more parasitic units are used, the larger the space will be, which does not conform to the eternal concept of antenna miniaturization. In view of the above problems, a three-band PIFA mobile phone antenna is designed. Summary of the invention

[0004] The purpose of the present invention is to provide a three-band PIFA mobile phone antenna to solve the defects of the existing mobile phone antenna, such as single frequency band, complex structure and large error.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a three-band PIFA mobile phone antenna, comprising a mounting plate;

[0006] The top of the mounting plate is provided with a frequency modulation structure, the outer side of the frequency modulation structure at the top of the mounting plate is provided with a protective shell, and one side of the frequency modulation structure at the top of the mounting plate is evenly provided with fixing grooves;

[0007] The frequency modulation structure includes a grounding plate, a radiation patch, a first empty slot, a grounding point, a feed point, a feed plate and a short-circuit plate. The grounding plate is fixedly installed on the top of the mounting plate. A third reserved slot is provided on one side of the grounding plate. A radiation patch is arranged above the grounding plate. A first empty slot is provided on one side of the radiation patch. A second empty slot is provided inside the radiation patch inside the first empty slot. A feed plate and a short-circuit plate are respectively fixed on one side of the bottom end of the radiation patch away from the first empty slot. A grounding point and a feed point are respectively fixed on one side of the grounding plate close to the fixed slot.

[0008] The bottom of the protective shell is evenly provided with fixing structures.

[0009] Preferably, mounting holes are evenly formed at the edge of the mounting plate, and a first reserved groove is formed at the bottom end of the third reserved groove in the mounting plate.

[0010] Preferably, the fixing structure includes a snap-in groove, a second reserved groove, a connecting block and a snap-in block, the snap-in grooves are evenly arranged at the bottom of the protective shell, a second reserved groove is arranged inside the protective shell at one end of the snap-in groove, connecting blocks are evenly arranged inside the second reserved groove, and a snap-in block is fixed on one side of the top of the connecting block close to the snap-in groove.

[0011] Preferably, the connecting block is located at one side of the clamping groove, and the bottom end of the connecting block is fixedly connected to the top end of the mounting plate.

[0012] Preferably, the main cross-section of the clamping block is triangular, and the clamping block and the protective shell form a clamping structure through a clamping groove.

[0013] Preferably, a transmission line is fixed to the bottom end of the ground plate.

[0014] Preferably, the first empty slot and the second empty slot are both in a "U" shape.

[0015] Preferably, the grounding point and the feeding point are both embedded in the fixing groove.

[0016] Preferably, one end of the feed point is connected to the transmission line.

[0017] Preferably, the bottom end of the feed plate passes through the third reserved slot and is connected to the transmission line at the bottom end of the ground plate.

[0018] The present invention provides a three-band PIFA mobile phone antenna, which has the advantages of: using a U-shaped first empty slot and a second empty slot to achieve less influence between the frequency bands, being relatively independent of each other, reducing the error between the frequency bands, being simple to adjust, and being easy to manufacture, greatly simplifying the design process of the PIFA antenna, being able to be implemented on a single-layer microstrip antenna without the need for multiple patches, and being easy to process, enabling the antenna to achieve multi-frequency operation within a limited frequency band, having potential in engineering applications, and being able to simultaneously achieve miniaturized design.

[0019] By providing a frequency modulation structure, the U-shaped first and second slots facilitate the determination of the feeding position and realize the multi-frequency function, thereby reducing the influence between the frequency bands and reducing the frequency band error. The frequency bands are relatively independent of each other and are easy to adjust. The size of the antenna is reduced by about 30%, which is convenient for manufacturing and greatly simplifies the design process of the PIFA antenna.

[0020] Furthermore, with the help of the radiation patch, there is no need for multiple patches and it is easy to process, which enables the antenna to work at multiple frequencies within a limited frequency band and has potential in engineering applications, and can simultaneously achieve miniaturization design;

[0021] Furthermore, the protective shell is covered on the outside of the frequency modulation structure through the fixed structure, thereby preventing the frequency modulation structure from being accidentally touched or collided during use, and effectively extending the service life of the frequency modulation structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a front view schematic diagram of the present invention;

[0023] Figure 2 It is a main exploded schematic diagram of the present invention;

[0024] Figure 3 It is a bottom-up exploded schematic diagram of the present invention;

[0025] Figure 4 It is a schematic diagram of the main cross-section of the frequency modulation structure of the present invention;

[0026] Figure 5 It is a top cross-sectional schematic diagram of the present invention;

[0027] Figure 6 It is a front cross-sectional schematic diagram of the present invention;

[0028] Figure 7 For the present invention Figure 6 Schematic diagram of the cross section at point A;

[0029] Figure 8 It is a schematic diagram of a partial front cross-section of the fixing structure of the present invention from a first viewing angle;

[0030] Fig. 9 It is a schematic diagram of a partial front cross-section of the fixing structure of the present invention from a second viewing angle;

[0031] Fig.10 The return loss diagram of the GSM900, DCS1800 and ISM2450 frequency bands of the present invention is shown in the figure. Explanation of the reference numerals in the figure: 1, mounting plate; 11, mounting hole; 12, fixing slot; 13, first reserved slot; 2, protective shell; 3, fixing structure; 31, snap-in slot; 32, second reserved slot; 33, connecting block; 34, snap-in block; 4, frequency modulation structure; 41, grounding plate; 411, third reserved slot; 42, radiation patch; 43, first empty slot; 431, second empty slot; 44, grounding point; 45, feeding point; 46, feeding plate; 47, short-circuit plate. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] See also Figure 1-Figure 10 The present invention provides a three-band PIFA mobile phone antenna, including a mounting plate 1.

[0034] Reference Figure 2-Figure 5 As shown, a frequency modulation structure 4 is provided at the top of the mounting plate 1, and the frequency modulation structure 4 includes a grounding plate 41, a radiation patch 42, a first empty slot 43, a grounding point 44, a feeding point 45, a feeding plate 46 and a short-circuit plate 47. The grounding plate 41 is fixedly installed on the top of the mounting plate 1, and a third reserved slot 411 is provided on one side of the inside of the grounding plate 41, and a radiation patch 42 is provided above the grounding plate 41, and a first empty slot 43 is provided on one side of the inside of the radiation patch 42, and a second empty slot 431 is provided inside the radiation patch 42 inside the first empty slot 43, and a feeding plate 46 and a short-circuit plate 47 are respectively fixed on one side of the bottom end of the radiation patch 42 away from the first empty slot 43, and the grounding plate 41 is close to the fixed slot 12. A grounding point 44 and a feeding point 45 are fixed on one side respectively, a protective shell 2 is arranged on the outer side of the frequency modulation structure 4 at the top of the mounting plate 1, a fixing groove 12 is evenly opened on one side of the frequency modulation structure 4 at the top of the mounting plate 1, mounting holes 11 are evenly opened at the edge position inside the mounting plate 1, a first reserved groove 13 is opened at the bottom end of the third reserved groove 411 inside the mounting plate 1, a transmission line is fixed to the bottom end of the grounding plate 41, the first empty groove 43 and the second empty groove 431 are both in a "U" shape, the grounding point 44 and the feeding point 45 are both embedded in the fixing groove 12, one end of the feeding point 45 is connected to the transmission line, and the bottom end of the feeding plate 46 passes through the third reserved groove 411 and is connected to the transmission line at the bottom end of the grounding plate 41.

[0035] The radiation patch 42 is fixed to the top of the mounting plate 1 through the short-circuit plate 47, and the bottom end of the feed plate 46 passes through the third reserved slot 411 and is connected to the transmission line at the bottom end of the ground plate 41. During use, the U-shaped first empty slot 43 and the second empty slot 431 are opened inside the radiation patch 42 to facilitate the determination of the feeding position and realize the multi-frequency function, reduce the influence between the frequency bands, reduce the frequency band error, are relatively independent of each other, and are easy to adjust. The size of the antenna is reduced by about 30%, which is easy to manufacture and greatly simplifies the design process of the PIFA antenna. Under the action of the radiation patch 42, there is no need for multiple patches and it is easy to process. The antenna can achieve multi-frequency operation within a limited frequency band and has potential in engineering applications, and can simultaneously achieve miniaturized design;

[0036] Reference Fig.10 It can be seen that when working in the frequency bands of 0.854GHz~0.984GHz, 1.796GHz~1.829GHz and 2.427GHz~2.474GHz, the antenna resonant frequencies are approximately 0.908GHz, 1.814GHz and 2.451GHz, and at the center frequency of 2.415G, the return loss reaches -35.5dB.

[0037] Reference Figure 1 and Figure 6-Figure 9 As shown, the bottom of the protective shell 2 is evenly provided with a fixing structure 3, and the fixing structure 3 includes a snap-in groove 31, a second reserved groove 32, a connecting block 33 and a snap-in block 34. The snap-in groove 31 is evenly opened at the bottom of the protective shell 2, and the interior of the protective shell 2 at one end of the snap-in groove 31 is provided with a second reserved groove 32, and the interior of the second reserved groove 32 is evenly provided with connecting blocks 33. The top of the connecting block 33 is fixed with a snap-in block 34 on one side close to the snap-in groove 31. The connecting block 33 is located on one side of the snap-in groove 31, and the bottom end of the connecting block 33 is fixedly connected to the top of the mounting plate 1. The main cross-section of the snap-in block 34 is triangular, and the snap-in block 34 and the protective shell 2 form a snap-in structure through the snap-in groove 31.

[0038] The protective shell 2 is covered on the outside of the frequency modulation structure 4, and the protective shell 2 is pressed so that the connecting block 33 drives the clamping block 34 to move to the inside of the clamping groove 31. The clamping block 34 and the protective shell 2 are clamped with each other through the clamping groove 31, so that the protective shell 2 and the mounting plate 1 are fixed to each other, and then the protective shell 2 protects the frequency modulation structure 4, avoiding accidental contact and collision of the frequency modulation structure 4 during use.

[0039] Working principle: A frequency modulation structure 4 is arranged at the top of the mounting plate 1, and the frequency modulation structure 4 includes a grounding plate 41, a radiation patch 42, a first empty slot 43, a grounding point 44, a feed point 45, a feed plate 46 and a short-circuit plate 47. The grounding plate 41 is fixedly installed on the top of the mounting plate 1, and a third reserved slot 411 is provided on one side of the inside of the grounding plate 41. A radiation patch 42 is arranged above the grounding plate 41, and a first empty slot 43 is provided on one side of the inside of the radiation patch 42. A second empty slot 431 is provided inside the radiation patch 42 inside the first empty slot 43. The first empty slot 43 and the second empty slot 431 are both in a "U" shape. The grounding point 44 and the feed point 45 are both embedded in the fixed slot 12, and one end of the feed point 45 is connected to the transmission line. The bottom end of the feed plate 46 passes through the third reserved slot 411 and is connected to the transmission line at the bottom of the grounding plate 41. , double U-shaped slots are selected for design. The main reasons are: the U-shape is symmetrical, the feeding position is easy to determine, and the double U-shape is used to achieve less influence between the frequency bands, which are relatively independent of each other, simple to adjust, and easy to manufacture, which greatly simplifies the design process of the PIFA antenna. During use, the U-shaped first empty slot 43 and the second empty slot 431 are opened inside the radiation patch 42 to facilitate the determination of the feeding position and realize the multi-frequency function, reduce the influence between the frequency bands, reduce the frequency band error, are relatively independent of each other, simple to adjust, and reduce the size of the antenna by about 30%, which is easy to manufacture, greatly simplifying the design process of the PIFA antenna. Under the action of the radiation patch 42, there is no need for multiple patches, and it is easy to process, so that the antenna can achieve multi-frequency operation within a limited frequency band, has potential in engineering applications, and can simultaneously achieve miniaturized design.

[0040] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

Claims

1. A triple-band PIFA mobile phone antenna, comprising a mounting plate (1); Features: A frequency modulation structure (4) is arranged at the top of the mounting plate (1), a protective shell (2) is arranged on the outer side of the frequency modulation structure (4) at the top of the mounting plate (1), and fixing grooves (12) are evenly arranged on one side of the frequency modulation structure (4) at the top of the mounting plate (1); The frequency modulation structure (4) comprises a grounding plate (41), a radiation patch (42), a first empty slot (43), a grounding point (44), a feeding point (45), a feeding plate (46) and a short-circuit plate (47); the grounding plate (41) is fixedly mounted on the top of the mounting plate (1); a third reserved slot (411) is provided on one side of the grounding plate (41); a radiation patch (42) is arranged above the grounding plate (41); a first empty slot (43) is provided on one side of the radiation patch (42); a second empty slot (431) is provided inside the radiation patch (42) inside the first empty slot (43); a feeding plate (46) and a short-circuit plate (47) are respectively fixed on one side of the bottom end of the radiation patch (42) away from the first empty slot (43); and a grounding point (44) and a feeding point (45) are respectively fixed on one side of the grounding plate (41) close to the fixing slot (12); The bottom of the protective shell (2) is evenly provided with fixing structures (3).

2. The triple-band PIFA mobile phone antenna according to claim 1, characterized in that: Mounting holes (11) are evenly arranged at the edge of the mounting plate (1), and a first reserved groove (13) is arranged at the bottom end of the third reserved groove (411) inside the mounting plate (1).

3. The triple-band PIFA mobile phone antenna according to claim 1, characterized in that: The fixing structure (3) comprises a clamping groove (31), a second reserved groove (32), a connecting block (33) and a clamping block (34); the clamping groove (31) is evenly arranged at the bottom of the protective shell (2); a second reserved groove (32) is arranged inside the protective shell (2) at one end of the clamping groove (31); connecting blocks (33) are evenly arranged inside the second reserved groove (32); and a clamping block (34) is fixed on one side of the top of the connecting block (33) close to the clamping groove (31).

4. The triple-band PIFA mobile phone antenna according to claim 3, characterized in that: The connection block (33) is located on one side of the clamping groove (31), and the bottom end of the connection block (33) is fixedly connected to the top end of the mounting plate (1).

5. The triple-band PIFA mobile phone antenna according to claim 3, characterized in that: The main cross-section of the clamping block (34) is triangular, and the clamping block (34) and the protective shell (2) form a clamping structure through the clamping groove (31).

6. The triple-band PIFA mobile phone antenna according to claim 1, characterized in that: A transmission line is fixed to the bottom end of the ground plate (41).

7. The triple-band PIFA mobile phone antenna according to claim 1, characterized in that: The first empty slot (43) and the second empty slot (431) are both in a "U" shape.

8. The triple-band PIFA mobile phone antenna according to claim 1, characterized in that: The grounding point (44) and the feeding point (45) are both embedded in the fixing groove (12).

9. The triple-band PIFA mobile phone antenna according to claim 6, characterized in that: One end of the feed point (45) is connected to the transmission line.

10. The triple-band PIFA mobile phone antenna according to claim 6, characterized in that: The bottom end of the feeding plate (46) passes through the third reserved slot (411) and is connected to the transmission line at the bottom end of the grounding plate (41).

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