Intelligent terminal local antenna assembly flexibly applying antenna tuning switch

Abstract

The utility model provides an intelligent terminal local antenna assembly capable of flexibly applying an antenna tuning switch, which comprises a high-frequency receiving antenna and an intermediate-frequency main transmitting antenna which are arranged on a metal frame of intelligent equipment, and the high-frequency receiving antenna and the intermediate-frequency main transmitting antenna are arranged adjacently. The mainboard is provided with a first tuning switch matched with the high-frequency receiving antenna, the mainboard is provided with a second tuning switch matched with the intermediate-frequency main transmitting antenna, the high-frequency receiving antenna not only plays a role in high-frequency receiving, but also serves as a parasitic antenna of the intermediate-frequency main transmitting antenna, and the intermediate-frequency main transmitting antenna is connected with the high-frequency receiving antenna through the first tuning switch. The high-frequency receiving antenna forms different parasitic antenna lengths, the resonance position offset of the intermediate-frequency main transmitting antenna is influenced through the combined action of the first tuning switch and the second tuning switch, and the radiation performance of the intermediate-frequency main transmitting antenna is adjusted. The antenna assembly is very high in total radiation efficiency, and due to reasonable antenna layout, the antennas do not interfere with each other during working.

Description

Technical Field

[0001] This utility model relates to the field of mobile terminal antenna structure, specifically to a local antenna assembly for a smart terminal that flexibly utilizes an antenna tuning switch. Background Technology

[0002] MDA (Mold Direct Assembly) metal frame antennas are an advanced manufacturing process that directly integrates antenna structures (such as metal radiators, feed networks, etc.) into the device frame. Currently, metal frame antennas are widely used in many smart terminals. With the increasing maturity of fifth-generation communication mobile phone antenna solutions, in addition to using a reasonable antenna layout to achieve excellent antenna performance, it is also crucial to quickly debug the antenna to ensure that communication performance meets the standards.

[0003] Metal frame antennas typically consist of multiple antennas, each individually coupled to achieve optimal performance. Interference between antennas is then reduced through proper placement. However, this approach does not consider antenna coordination. Since each antenna requires individual design and significant modifications, it results in substantial losses and affects the overall radiation efficiency of the antenna.

[0004] Many existing metal frame antenna solutions have too low fault tolerance. Often, the performance of the first version of the antenna will not meet the standards. It usually requires multiple adjustments to the antenna mold and the antenna part of the PCB board design to meet the final performance indicators, which makes the mold opening cost very high. Utility Model Content

[0005] To address the problems in the prior art, this utility model provides a local antenna assembly for a smart terminal that flexibly utilizes an antenna tuning switch.

[0006] This utility model discloses a local antenna assembly for a smart terminal that flexibly utilizes an antenna tuning switch. It includes a high-frequency receiving antenna and an intermediate-frequency (IF) main transmitting antenna mounted on the metal frame of the smart device. The high-frequency receiving antenna has a first feed point and a first return point electrically connected to the motherboard, and the IF main transmitting antenna has a second feed point and a second return point electrically connected to the motherboard.

[0007] The high-frequency receiving antenna is arranged adjacent to the intermediate-frequency main transmitting antenna. The main board is provided with a first tuning switch that matches the high-frequency receiving antenna and a second tuning switch that matches the intermediate-frequency main transmitting antenna. In addition to its high-frequency receiving function, the high-frequency receiving antenna also serves as a parasitic antenna of the intermediate-frequency main transmitting antenna. By using the first tuning switch, the high-frequency receiving antenna can form different parasitic antenna lengths. Through the combined action of the first and second tuning switches, the resonant position shift of the intermediate-frequency main transmitting antenna is affected, thereby adjusting the radiation performance of the intermediate-frequency main transmitting antenna.

[0008] Furthermore, the local antenna assembly of the smart terminal also includes an NR receiving antenna and a low-frequency receiving antenna disposed on the smart metal frame. The NR receiving antenna has a third feed point and a third return point electrically connected to the motherboard, and the low-frequency receiving antenna has a fourth feed point and a fourth return point electrically connected to the motherboard. The motherboard is provided with a third tuning switch that matches the low-frequency receiving antenna.

[0009] Furthermore, the high-frequency receiving antenna, the intermediate-frequency main transmitting antenna, the NR receiving antenna, and the low-frequency receiving antenna are arranged adjacent to each other in sequence, and there is a break point between two adjacent antennas to separate each antenna.

[0010] Furthermore, the high-frequency receiving antenna and the intermediate-frequency main transmitting antenna are both planar inverted-F antennas, the NR receiving antenna is a wideband LOOP antenna, and the antenna frequency band of the NR receiving antenna is N77, N78, and N79.

[0011] Furthermore, the high-frequency receiving antenna has an antenna frequency band of B / N40 and B / N41, a length of 22mm, and a protrusion length of 2.5-3.5mm.

[0012] Furthermore, the intermediate frequency main transmitting antenna has an antenna frequency band of B / N1 and B / N3, an antenna length of 22mm, and a protrusion length of 1.3-2.3mm.

[0013] Furthermore, the low-frequency receiving antenna has an antenna frequency band of B / N5, B / N8, or B / N28, a total length of 61-62.5 mm, a protruding length of 5.1-6.1 mm, and a total slit length of 55.3-56.3 mm.

[0014] Furthermore, the low-frequency receiving antenna is provided with several connecting ribs for adjusting the slit length. Before manufacturing the low-frequency receiving antenna, a metal model is manufactured using logic programmable numerical control technology. By removing different connecting ribs, the slit length can be changed. Through debugging, the optimal low-frequency receiving antenna structure is determined.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: by combining antennas of different frequency bands into an antenna assembly, there will be no mutual interference between the antennas, thus simplifying the position design; by setting the high-frequency receiving antenna and the intermediate frequency main transmitting antenna adjacent to each other, and setting the high-frequency receiving antenna as a parasitic antenna of the intermediate frequency main transmitting antenna, and coordinating the two with a coordination switch, a flexible configuration can be achieved. Through the combined action of the first tuning switch and the second tuning switch, different lengths can be matched. Compared with using its own structure and the second coordination switch alone, the design modification of the intermediate frequency main transmitting antenna of this utility model is smaller, the return loss is greatly reduced, and the antenna transmission performance is effectively improved.

[0016] Furthermore, this invention flexibly utilizes antenna tuning switches and programmable numerical control technology to achieve the function of changing the gap length, thereby improving the fault tolerance rate of antenna tuning and making the antenna tuning fault tolerance rate higher. This invention typically only requires one PCB manufacturing and antenna mold opening to make the antenna performance meet the standards, without the need for multiple board modifications and repeated mold repairs, significantly reducing mold opening costs. Attached Figure Description

[0017] To more clearly illustrate the solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the antenna assembly structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the structure of a high-frequency receiving antenna and an intermediate-frequency main transmitting antenna;

[0020] Figure 3 Schematic diagram of NR receiving antenna and low-frequency receiving antenna structure;

[0021] Figure 4 This is a diagram showing the initial return loss of a high-frequency receiving antenna.

[0022] Figure 5 This is a schematic diagram of the configuration of the first tuning switch of this utility model;

[0023] Figure 6 Return loss diagram for high-frequency receiving antenna with the first tuning switch turned on;

[0024] Figure 7 The overall radiation efficiency diagram for the high-frequency receiving antenna using the first tuning switch;

[0025] Figure 8 This is a diagram showing the initial return loss of the intermediate frequency main transmitter antenna.

[0026] Figure 9 This is a schematic diagram of the configuration of the second tuning switch of this utility model;

[0027] Figure 10 The return loss diagram is shown when the intermediate frequency main transmitting antenna has no parasitic antenna.

[0028] Figure 11 The diagram shows the total radiation efficiency of the intermediate frequency main transmitting antenna when there are no parasitic antennas.

[0029] Figure 12 The return loss diagram is shown for the intermediate frequency main transmitting antenna of this utility model.

[0030] Figure 13 This is a diagram showing the total radiation efficiency of the intermediate frequency main transmitting antenna of this utility model;

[0031] Figure 14 The diagram shows the return loss of the NR receiving antenna.

[0032] Figure 15 Diagram of total radiation efficiency of NR receiving antenna

[0033] Figure 16 This is a final state diagram of an embodiment of the low-frequency receiving antenna of this utility model after disconnecting the connecting ribs using logic programmable numerical control technology;

[0034] Figure 17 A schematic diagram showing the configuration of a third tuning switch for the low-frequency receiving antenna of this utility model;

[0035] Figure 18 This is a diagram showing the return loss of a low-frequency receiving antenna.

[0036] Figure 19 This is a diagram showing the total radiation efficiency of low-frequency reception. Detailed Implementation

[0037] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, and accompanying drawings are used to distinguish different objects, not to describe a particular order.

[0038] In this invention, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment to other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this invention can be combined with other embodiments.

[0039] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0040] like Figure 1 and Figure 2As shown, the present invention utilizes an antenna tuning switch to flexibly employ a local antenna assembly for a smart terminal, comprising a high-frequency receiving antenna 1 and an intermediate-frequency main transmitting antenna 2 disposed on the metal frame of the smart device. The high-frequency receiving antenna 1 is provided with a first feed point 102 and a first return point 101 electrically connected to the motherboard, and the intermediate-frequency main transmitting antenna 2 is provided with a second feed point 201 and a second return point 202 electrically connected to the motherboard. The high-frequency receiving antenna 1 and the intermediate-frequency main transmitting antenna 2 are disposed adjacent to each other.

[0041] As an embodiment of this utility model, the smart terminal in this example is a 5G mobile phone. The 5G mobile phone in this example also has a mid-frame, and a motherboard mounting part 5 is provided in the mid-frame. The local antenna assembly of the smart terminal is part of the metal frame. The first feed point 102 and the first return point 101 of the high-frequency receiving antenna 1, and the second feed point 201 and the second return point 202 of the intermediate frequency main transmitting antenna 2 are electrically connected to the motherboard through antenna springs, forming a loop with the radio frequency link on the motherboard.

[0042] Preferably, such as Figure 1 and Figure 3 As shown, the local antenna assembly of the smart terminal in this example also includes an NR receiving antenna 3 and a low-frequency receiving antenna 4. The NR receiving antenna 3 is provided with a third feed point 301 and a third return point 302 that are electrically connected to the motherboard. The low-frequency receiving antenna 4 is provided with a fourth feed point 401 and a fourth return point that are electrically connected to the motherboard. The fourth return point is the tail end of the low-frequency receiving antenna 4 that is directly connected to the grounded metal shell.

[0043] This example intentionally separates antennas operating at the same frequency and band, setting the four antenna components to different frequency bands: high frequency, intermediate frequency, NR, and low frequency. This provides wide coverage and prevents antenna performance from interfering with each other. The frequency bands for all antennas in this example are B / N1, B / N3, B / N5, B / N8, B / N28, B / N40, B / N41, N77, N78, and N79. Specifically,

[0044] Preferably, in this example, the high-frequency receiving antenna 1, the intermediate frequency main transmitting antenna 2, the NR receiving antenna 3, and the low-frequency receiving antenna 4 are arranged adjacent to each other in sequence, and there is a breakpoint 6 between two adjacent antennas to separate each antenna. In this example, the high-frequency receiving antenna is designed to have antenna frequency bands of B / N40 and B / N41, where the uplink and downlink frequencies of the B / N40 band are 2300-2400M, and the uplink and downlink frequencies of the B / N41 band are 2496-2690M. In this example, the intermediate frequency (IF) main transmitting antenna is designed for frequency bands B / N1 and B / N3. Specifically, B / N1 has an uplink frequency of 1920-1980MHz and a downlink frequency of 2110-2170MHz, while B / N3 has an uplink frequency of 1710-1785MHz and a downlink frequency of 1805-1880MHz. The NR receiving antenna in this example is designed for frequency bands N77, N78, and N79. Specifically, N77 has an uplink and downlink frequency of 3300-4200MHz. N78 has an uplink and downlink frequency of... Downlink 3300-3800M. N79 band uplink and downlink 4400-5000M. The low-frequency receiving antenna is designed for the B / N5, B / N8, and B / N28 bands. Specifically, the B / N5 band has an uplink of 824-849M and a downlink of 869-894M; the B / N8 band has an uplink of 880-915M and a downlink of 925-960M; and the B / N28 band has an uplink of 703-748M and a downlink of 758-803M.

[0045] like Figure 2 As shown, the high-frequency receiving antenna 1 in this example is essentially an inverted-F antenna with a length of 22mm. The length protruding from the first feed point 102 is 2.5-3.5mm, preferably about 3mm.

[0046] The initial return loss diagram of the high-frequency receiving antenna 1 in this example is shown below. Figure 3 As shown, the initial resonant frequency is approximately 3.6 GHz, and the antenna conforms to the basic characteristics of an inverted-F antenna receiving a fundamental wave with a wavelength approximately four to eight times its own (c = 2.97 * 10^8, λ). 1小 =4*22mm=0.088m, λ 2大 =8*22mm=0.176m, λ3=c / f1≈0.135m). However, this differs significantly from the high-frequency resonant frequency in this example. Therefore, a tuning circuit is installed on the motherboard in this example, the specific structure of which is as follows: Figure 5 As shown, an LC tuning network is set up in the main feed network, and a first tuning switch SW1 is configured, which makes it very easy to implement the resonant position shift of the antenna to meet the requirements of this utility model. During the design, attention should be paid to the selection of the switch to achieve the functions of single-series matching, single-parallel matching, multiple-parallel matching, and simultaneous parallel and series matching.

[0047] like Figure 6 and Figure 7As shown, after connecting the first tuning switch SW1 of this utility model, the waveform changes significantly. In this example, the return loss of the B / N40 band reaches a minimum of -41dB, and the return loss of the B / N41 band reaches a minimum of -14dB. The total radiation frequency of both bands is around -6dB. The return loss meets the RF adaptation conditions, and the total radiation efficiency is ahead of the industry average.

[0048] Most importantly, in this example, the first tuning switch SW1, besides adjusting the resonant position of its own antenna, also functions as a parasitic antenna for the adjacent intermediate frequency (IF) main transmitting antenna, acting as a "high-frequency receiving antenna." The parasitic antenna alters the antenna's radiation characteristics through the introduction of passive components (metal structures that are not directly fed) and electromagnetic coupling.

[0049] In this example, the intermediate frequency (IF) main transmitting antenna is essentially an inverted-F antenna, with a length of 22mm and a protrusion length of approximately 1.8mm, falling between 1.3-2.3mm. The initial return loss diagram is shown below. Figure 8 As shown, the initial resonant frequency is approximately 2.48 GHz. The antenna conforms to the basic characteristics of an inverted-F antenna receiving a fundamental wave with a wavelength approximately four to eight times its own (c = 2.97 * 10^8, λ...). 1小 =4*22mm=0.088m, λ 2大 =8*22mm=0.176m, λ3=c / f1≈0.12m). For example... Figure 9 As shown, the antenna return point in this example is equipped with a second tuning switch SW2. The main board of this example has a feed network and a return network connected to the intermediate frequency (IF) main transmitting antenna 2. The principle of this antenna tuning switch is to form an LC resonant network in the feed network, thereby shifting the resonant position of the antenna. However, usually, the larger the impedance formed by the LC resonant network at the return point of this type of antenna, the more the initial resonant frequency shift is changed, and the more loss is generated. Therefore, this antenna tuning switch cannot be used blindly. In the initial design of this example, considering the loss of the antenna tuning switch, this example utilizes the first tuning switch SW1 to form different parasitic antenna lengths of the high-frequency receiving antenna to tune the IF main transmitting antenna. Thus, the IF main transmitting antenna 2 of this invention can achieve very good results with minimal modification, greatly reducing the return loss. In this example, without using the high-frequency receiving antenna, the return loss and total radiation efficiency of the parasitic antenna are as follows: Figure 10 and Figure 11 As shown, the improved return loss and total radiation efficiency are respectively as follows: Figure 12 and Figure 13 As shown.

[0050] The comparison shows that in this example, the return loss was reduced from -12.5dB to a minimum of -25dB, the total radiation efficiency of the B / N1 band was improved from -5.7 to -6dB to -3.2 to -3.1dB, and the total radiation efficiency of the B / N3 band was improved from -5.9 to -6.3dB to approximately -3.7dB. The performance is excellent, outperforming competitors by 2dB. This is achieved by utilizing the function that allows the configured antenna tuning switch to be activated simultaneously when the terminal device is registered in a certain frequency band.

[0051] like Figure 3 As shown, the advantage of this example NR main transmitting antenna design is that it will not intertwine with adjacent antennas. Essentially, it is a wideband LOOP antenna, which has the advantage of wide bandwidth. Figure 13 This is a diagram of the returned signal loss after matching. Figure 14 The total radiation efficiency diagram of this antenna is obtained by... Figure 13 and Figure 14 As can be seen, the return loss of the NR main transmitting antenna in this example is below -6dB for all frequency bands, and the total radiation efficiency is above -6.5dB, demonstrating excellent performance.

[0052] like Figure 3 As shown, this example overcomes the drawbacks of existing antennas requiring multiple revisions and repeated mold modifications. It employs programmable numerical control (PNC) technology to increase the antenna's fault tolerance during debugging. Typically, only one PCB manufacturing and antenna mold opening are needed to achieve the required antenna performance, eliminating the need for multiple board modifications and repeated mold repairs. In terms of antenna structure, the low-frequency receiving antenna 4 has several connecting ribs 402 with adjustable slot lengths. Before fabricating the low-frequency receiving antenna, a metal model is created using PNC technology. By removing different connecting ribs, the slot length is changed, thereby improving the antenna's fault tolerance during debugging and preventing changes to the PCBA or mold due to poor antenna performance, which would increase project costs and extend the development cycle. This example uses metal model performance simulation to determine the optimal low-frequency receiving antenna structure, and then mold opening can achieve the optimal development of the low-frequency receiving antenna.

[0053] As an embodiment of this utility model, the total length (d1+d2) of the low-frequency receiving antenna 4 is set to approximately 61.7mm, the protruding length d2 is 5.6mm, the total length of the reserved slot d1 is 55.8mm, and a total of 4 connecting rib positions 402 are reserved from top to bottom. A metal model is manufactured using programmable numerical control (CNC) technology to achieve the function of changing the slot length. In this example, the antenna length is usually designed based on experience from similar projects and corresponding theoretical formulas. However, the designed length often differs from the actual required length (a suitable antenna length is necessary for excellent antenna performance). This is caused by factors such as screen clearance, motherboard wiring, and, after encapsulation, the inconsistent dielectric constants of different materials can also affect the antenna length setting (actual antenna wavelength = theoretical antenna wavelength / dielectric constant^1 / 2). In this example, the low-frequency receiving antenna is encapsulated with adhesive, and the dielectric constant of the adhesive used in this example is 3.2. Therefore, based on the calculations using programmable logic control (PLC) technology, removing the first and second connecting ribs 402 results in the optimal antenna performance. The structure of the low-frequency receiving antenna 4 after removing the two connecting ribs 402 is as follows: Figure 16 As shown, in this example, the antenna return point is directly connected to the ground of the casing. Preferably, a serial port and a third main-path tuning switch SW3 are also provided at the main feed point to achieve the optimal frequency configuration with the lowest loss. The low-frequency receiving antenna feed and tuning switch network diagram is shown below. Figure 17 As shown in the figure. The antenna return loss diagram after matching in this example is as follows. Figure 18 As shown, the overall radiation efficiency diagram of this antenna is as follows: Figure 19 As shown, through Figure 18 and Figure 19 It can be seen that the return loss of the low-frequency receiving antenna of this invention is below -13 and the efficiency is around -7, which is more than 1.5dB better than that of its competitors.

[0054] In summary, the total antenna radiation efficiency of the local antenna assembly for the intelligent terminal of this utility model is very high, and the return loss of the antenna design is greatly reduced. This utility model has the following innovative points:

[0055] 1. This utility model combines antennas of different frequency bands into an antenna assembly, so that there is no mutual interference between the antennas, thus not affecting the performance indicators of adjacent frequency antennas, and making the location design simpler.

[0056] 2. By setting the high-frequency receiving antenna and the intermediate frequency main transmitting antenna adjacent to each other, and setting the high-frequency receiving antenna as a parasitic antenna of the intermediate frequency main transmitting antenna, and coordinating the two with a coordination switch, a flexible configuration can be achieved. Through the combined action of the first tuning switch and the second tuning switch, different lengths can be matched. Compared with using its own structure and the second coordination switch alone, the design of the intermediate frequency main transmitting antenna of this utility model has less modification, the return loss is greatly reduced, and the antenna transmission performance is effectively improved.

[0057] 3. This utility model offers more antenna debugging methods, avoiding the need for PCBA or mold modifications due to poor antenna performance, which would increase project costs and extend the R&D cycle. This utility model flexibly utilizes antenna tuning switches and programmable numerical control technology to change the gap length, thereby improving the fault tolerance rate of antenna debugging. This utility model typically only requires one PCB manufacturing and antenna mold opening to achieve the required antenna performance, eliminating the need for multiple board modifications and repeated mold repairs, thus significantly reducing mold opening costs.

[0058] The specific embodiments described above are preferred embodiments of this utility model, and are not intended to limit the specific scope of this utility model. The scope of this utility model includes but is not limited to the specific embodiments described above. All equivalent changes made in accordance with this utility model are within the protection scope of this utility model.

Claims

1. A local antenna assembly for a smart terminal that flexibly utilizes an antenna tuning switch, characterized in that: The system includes a high-frequency receiving antenna and an intermediate-frequency (IF) main transmitting antenna mounted on the metal frame of the smart terminal. The high-frequency receiving antenna has a first feed point and a first return point electrically connected to the motherboard, and the IF main transmitting antenna has a second feed point and a second return point electrically connected to the motherboard. The high-frequency receiving antenna is arranged adjacent to the intermediate-frequency main transmitting antenna. The main board is provided with a first tuning switch that matches the high-frequency receiving antenna and a second tuning switch that matches the intermediate-frequency main transmitting antenna. In addition to its high-frequency receiving function, the high-frequency receiving antenna also serves as a parasitic antenna of the intermediate-frequency main transmitting antenna. By using the first tuning switch, the high-frequency receiving antenna can form different parasitic antenna lengths. Through the combined action of the first and second tuning switches, the resonant position shift of the intermediate-frequency main transmitting antenna is affected, thereby adjusting the radiation performance of the intermediate-frequency main transmitting antenna.

2. The intelligent terminal partial antenna assembly that flexibly utilizes an antenna tuning switch according to claim 1, characterized in that: The local antenna assembly of the smart terminal also includes an NR receiving antenna and a low-frequency receiving antenna disposed on the metal frame of the smart terminal. The NR receiving antenna is provided with a third feed point and a third return point electrically connected to the motherboard. The low-frequency receiving antenna is provided with a fourth feed point and a fourth return point electrically connected to the motherboard. The motherboard is provided with a third tuning switch that matches the low-frequency receiving antenna.

3. The intelligent terminal partial antenna assembly that flexibly utilizes an antenna tuning switch according to claim 2, characterized in that: The high-frequency receiving antenna, the intermediate-frequency main transmitting antenna, the NR receiving antenna, and the low-frequency receiving antenna are arranged adjacent to each other in sequence, and there is a break point between two adjacent antennas to separate each antenna.

4. The intelligent terminal partial antenna assembly that flexibly utilizes an antenna tuning switch according to claim 3, characterized in that: The high-frequency receiving antenna and the intermediate-frequency main transmitting antenna are both planar inverted-F antennas. The NR receiving antenna is a wideband LOOP antenna, and the antenna frequency band of the NR receiving antenna is N77, N78 and N79.

5. The intelligent terminal partial antenna assembly that flexibly utilizes an antenna tuning switch according to claim 4, characterized in that: The high-frequency receiving antenna has frequency bands B / N40 and B / N41, a length of 22mm, and a protrusion length of 2.5-3.5mm.

6. The intelligent terminal partial antenna assembly that flexibly utilizes an antenna tuning switch according to claim 4, characterized in that: The intermediate frequency main transmitting antenna has frequency bands B / N1 and B / N3, an antenna length of 22mm, and a protrusion length of 1.3-2.3mm.

7. The intelligent terminal partial antenna assembly that flexibly utilizes an antenna tuning switch according to claim 4, characterized in that: The low-frequency receiving antenna has frequency bands of B / N5, B / N8 and B / N28, a total length of 61-62.5mm, a protruding length of 5.1-6.1mm, and a total slit length of 55.3-56.3mm.

8. The intelligent terminal partial antenna assembly that flexibly utilizes an antenna tuning switch according to claim 7, characterized in that: The low-frequency receiving antenna has several connecting ribs that allow for adjustment of the slit length. Before fabricating the low-frequency receiving antenna, a metal model is manufactured using programmable numerical control (NNC) technology. By removing different connecting ribs, the slit length can be changed. Based on the debugging results, the optimal low-frequency receiving antenna structure is determined.

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