Antenna and terminal device

Abstract

The utility model discloses an antenna and terminal equipment, the antenna comprises a first radiator and at least one second radiator, and the first radiator generates a first resonant frequency; each of the at least one second radiator and the first radiator are arranged in an outer shell and are coupled in a suspended manner to form resonance, the at least one second radiator and the first radiator resonate to generate at least one second resonant frequency, and the second resonant frequency is different from the first resonant frequency. According to the embodiment of the invention, the second radiating body which is suspended relative to the first radiating body is adopted, so that the structural complexity of the first radiating body can be reduced, and the processing difficulty of the first radiating body is reduced; the first radiating body generates the first resonant frequency, and the second radiating body and the first radiating body generate the second resonant frequency, so that multiple functions of the antenna can be conveniently realized, the antenna performance is improved, and the application range is widened.

Description

Technical Field

[0001] The present application relates to the field of antenna technology, and in particular to an antenna and a terminal device. Background Art

[0002] Currently, mainstream walkie-talkies generally offer narrowband voice intercom and single-frequency GPS (Global Positioning System) positioning capabilities. However, with the development of dual-frequency GPS and Beidou systems, the demand for external antennas is increasing. To improve antenna performance, some technologies often add a branch to the main frequency antenna to implement GPS functionality, which increases the complexity of the antenna structure and raises the manufacturing requirements for the antenna. Utility Model Content

[0003] The present application provides an antenna and terminal device, aiming to improve the problems of high structural complexity and high process requirements of multifunctional antennas.

[0004] To achieve the above technical effects, a technical solution adopted in this application is to provide an antenna, comprising:

[0005] a first radiator, the first radiator generating a first resonant frequency; and

[0006] At least one second radiator, each of the at least one second radiator is respectively arranged inside and outside the first radiator and suspended and coupled to form resonance, the at least one second radiator resonates with the first radiator to generate at least one second resonant frequency, and the second resonant frequency is different from the first resonant frequency.

[0007] This application also proposes an example of a terminal device, including:

[0008] the subject; and

[0009] Like the above antenna, the antenna is connected to the main body.

[0010] In the example of the present application, by adopting a second radiator that is suspended relative to the first radiator, the structural complexity of the first radiator can be reduced and the processing difficulty of the first radiator can be reduced; the first resonant frequency is generated by the first radiator, and the second radiator resonates with the first radiator to generate the second resonant frequency, which can facilitate the antenna to achieve multi-functionality and improve the antenna performance and application range. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0012] Figure 1 This is a schematic diagram of the structure of an example of a terminal device of the present application;

[0013] Figure 2 This is a schematic structural diagram of an example of an antenna of the present application;

[0014] Figure 3 This is a schematic diagram of the main frequency current distribution of the first radiator of this application;

[0015] Figure 4 This is a schematic diagram of the third harmonic current distribution of the main frequency of the first radiator of this application;

[0016] Figure 5 This is a schematic diagram of the 5th harmonic current distribution of the main frequency of the first radiator of this application;

[0017] Figure 6 This is a schematic diagram of the structure of the second radiator of the GPS L5 frequency band of this application;

[0018] Figure 7 This is a schematic diagram of the current distribution in the GPS L5 band of this application;

[0019] Figure 8 This is a graph of S11 (reflection coefficient) for an example of the GPS L5 frequency band of this application;

[0020] Figure 9 is an S11 curve diagram of another example of the GPS L5 frequency band of the present application, wherein the second radiator is provided with an opening;

[0021] Figure 10 1 is a schematic diagram of reactance of another example of the GPS L5 frequency band of the present application, wherein the second radiator is provided with an opening;

[0022] Figure 11 This is a schematic diagram of the structure of the second radiator of the GPS L1 frequency band of this application;

[0023] Figure 12 This is a schematic diagram of the current distribution in the GPS L1 band of this application;

[0024] Figure 13 This is an S11 curve diagram of an example of GPS L1 frequency band of this application;

[0025] Figure 14 is an S11 curve diagram of another example of the GPS L1 frequency band of the present application, wherein the second radiator is provided with an opening;

[0026] Figure 15 is a schematic diagram of reactance of another example of the GPS L1 frequency band of the present application, wherein the second radiator is provided with an opening;

[0027] Figure 16is an S11 graph of another example of the antenna of the present application, wherein the three second radiators are all provided with openings;

[0028] Figure 17 This is a comparison diagram of antenna field measurement and satellite search in an example of this application.

[0029] Among them: 100, main body; 200, antenna; 21, first radiator; 22, second radiator; 221, opening; 23, shell; 2a, first direction. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0031] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "multiple" means two or more, unless otherwise clearly and specifically defined. It should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" in this application should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application.

[0032] In this application, the word "exemplary" is used to mean "serving as an example, illustration, or illustration." Any embodiment described in this application as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is given to enable any person skilled in the art to implement and use the present application. In the following description, details are listed for the purpose of explanation. It should be understood that one of ordinary skill in the art can recognize that the present application can be implemented without using these specific details. In other instances, well-known structures and processes are not elaborated in detail to avoid obscuring the description of the present application with unnecessary details. Therefore, the present application is not intended to be limited to the embodiments shown, but is consistent with the widest scope consistent with the principles and features disclosed in this application.

[0033] The antenna on the terminal device can be used to transmit and receive signals in a specific frequency band. Taking a walkie-talkie as an example, the external helical antenna with GPS function in the current walkie-talkie usually uses branches to generate the frequency band required by single-frequency GPS. Depending on the different loading methods of the branches, the helical antenna structure also needs to adopt a variable pitch method to match the branches, which increases the complexity of the structure to a certain extent.

[0034] In response to the above-mentioned problem, the present application proposes an antenna, which adopts a first radiator and a second radiator arranged inside and outside the first radiator, so that the first radiator can serve as a main branch and the second radiator as a branch, thereby changing the resonant current distribution and facilitating tuning.

[0035] See also Figure 1-3 , this application proposes an example of an antenna 200 , including a first radiator 21 and a second radiator 22 .

[0036] The first radiator 21 generates a first resonant frequency. Figure 3: is the current distribution diagram of the first resonant frequency of the first radiator 21, i.e., the main frequency current distribution diagram, wherein the first resonant frequency can be an ultra-high frequency (UHF) band, and the first radiator 21 can operate in the UHF band. In this example, the operating frequency band of the first radiator 21 can be 400-470 MHz, and the first radiator 21 can be used to achieve narrowband. The first radiator 21 can be a linear antenna, a helical antenna, or an antenna of other shapes, or a combination of antennas of multiple shapes. In some examples, the first radiator 21 is arranged in a spiral shape, and the first radiator 21 extends generally in a spiral shape in a first direction 2a. The first direction 2a can be the length direction of the antenna 200. In the examples of the present application, the first radiator 21 can serve as the main branch of the antenna 200. In some examples, the first radiator 21 can be a constant pitch. Optionally, the first radiator 21 can be a constant pitch spring. In some examples, the length Lx of the first radiator 21 is 90 mm.

[0037] The second radiator 22 is configured to couple with the first radiator 21 to form resonance. The second radiator 22 and the first radiator 21 resonate to generate at least one second resonant frequency, where the second resonant frequency is different from the first resonant frequency. Optionally, the second resonant frequency in this example can be at least one of the GPS L1 (1575 MHz) frequency band, the GPS L5 (1176 MHz) frequency band, the WiFi frequency band, and the Bluetooth frequency band.

[0038] There is at least one second radiator 22, and the second radiator 22 and the first radiator 21 are arranged in an inner-outer arrangement, which means that the second radiator 22 is arranged outside the first radiator 21, or the second radiator 22 is arranged inside the first radiator 21, or there are multiple second radiators 22, some of which are arranged outside the first radiator 21, and some of which are located inside the spiral structure of the first radiator 21. Optionally, the first radiator 21 can be spirally wrapped around the outside of the second radiator 22. The second radiator 22 and the first radiator 21 are suspended and coupled to form resonance. In the example of the present application, the first radiator 21 can adopt a coil spring. By setting the second radiator 22 to be suspended and coupled with the first radiator 21, there is no need to add branches to the first radiator 21. On the one hand, the problem of increased difficulty in the coil spring process due to adding branches to the coil spring can be improved. On the other hand, since there is no need to use a spring with a variable pitch, a spring with a constant pitch can be used, which can effectively reduce the difficulty of the coil spring processing technology, simplify the processing technology of the first radiator 21, and reduce the structural complexity of the antenna 200.

[0039] In the example of the present application, the first radiator 21 and the second radiator 22 cooperate with each other, wherein the first radiator 21 is used to generate a first resonant frequency, and the second radiator 22 is used to resonate with the first radiator 21 to generate at least one second resonant frequency, and the first resonant frequency is different from the second resonant frequency, so that the antenna 200 can be used in multiple frequency bands.

[0040] The structure of the antenna 200 in the present application is described in detail below by taking the first resonant frequency being the UHF band and the second resonant frequency being the GPS L1 (1575 MHz) band and the GPS L5 (1176 MHz) band as an example.

[0041] Please combine Figure 4 as well as Figure 5 , Figure 4 is the current distribution diagram of the third harmonic of the first resonant frequency, Figure 4 is a current distribution diagram of the 5th harmonic of the first resonant frequency, where the first resonant frequency is in the UHF band. In some examples, the second radiator 22 is arranged at the peak current of the harmonic of the first resonant frequency, where the peak current does not include the location of the peak current of the first resonant frequency. Combined with the symmetrical oscillator current distribution, the surface current distribution of the 3rd and 5th harmonics of the first resonant frequency on the first radiator 21 can be derived; the 3rd and 5th harmonics correspond to the second and third resonant points of the first radiator 21, respectively, which are approximately the 3rd and 5th times of the main frequency, and the current distribution at different resonant points is different. In some examples, the second radiator 22 includes at least one coupling ring. The coupling ring can be a circular ring structure, or a ring structure with other cross-sectional shapes; the coupling ring can be arranged inside and outside the first radiator 21.

[0042] In some examples, the coupling ring of at least one second radiator 22 is provided with an opening 221. The opening 221 of the coupling ring extends axially through the corresponding coupling ring to the corresponding end of the coupling ring. The opening 221 is a notch formed on the coupling ring, extending from one axial end to the other end of the corresponding coupling ring. The coupling ring provided with the opening 221 is in a disconnected state.

[0043] In some examples, the antenna 200 further includes a housing 23, which is disposed around the periphery of the first radiator 21, and the second radiator 22 can be nested inside and outside the housing 23. The housing 23 can be made of an insulating material. In this example, the housing 23 can be used to support the second radiator 22. The housing 23 can also be used to connect to the main body 100. The second radiator 22 can be disposed inside and outside the housing 23. The second radiator 22 can be disposed on the outside of the housing 23, or the second radiator 22 can be disposed on the inside of the housing 23, or a portion of the second radiator 22 can be disposed on the outside of the housing 23 and a portion of the second radiator 22 can be disposed on the inside of the housing 23.

[0044] In some examples, the width of opening 221 along the circumferential direction of housing 23 is w, and the inner diameter of the portion of housing 23 corresponding to first radiator 21 is R, where w is not less than 0. In this example, the efficiency of antenna 200 can be improved by providing opening 221. Optionally, the width w of opening 221 along the circumferential direction of housing 23 is not greater than 0.5R, so that the second radiator 22 increases the tuning offset of the first radiator 21, thereby improving the efficiency of antenna 200.

[0045] Please combine Figure 6 、 Figure 7 as well as Figure 8 In some examples, the first resonant frequency is the UHF band, that is, the main frequency is the UHF band, and the second resonant frequency is the GPS L5 band; the number of the second radiator 22 is one, and the third harmonic of the first resonant frequency has two peak currents along the length direction of the first radiator 21 (such as Figure 4 01 and 02 positions shown), one of the two peak currents is the peak current of the UHF band ( Figure 4 02 position in the middle), the second radiator 22 is set at the other peak current of the two peak currents ( Figure 4 01 position in the figure). The second radiator 22 is set to avoid the peak current 02 position of the third harmonic, which can avoid the influence of the second radiator 22 on the main frequency. Adding the second radiator 22 at the peak current of the third harmonic of the first resonant frequency is similar to extending the current path. The extension of the path will cause the radiator to be equivalently longer in principle, thereby causing the frequency to shift to a low frequency, so as to tune the resonance point of the third harmonic to the frequency of GPS L5. Optionally, the length of the second radiator 22 in this example is not greater than the length 7L of the path of the peak current of the harmonic of the first resonant frequency. Figure 8As can be seen in the figure, when the length of the second radiator 22 is 8 mm, 11 mm, and 13 mm, the S11 coefficient of the antenna 200 is -20.9 dB, -20.58 dB, and -17.52 dB, respectively. The reflection loss is very small, and the antenna performance is not affected by the reflected signal. Alternatively, the length of the second radiator 22 can be determined based on the length of the path of the peak current of the harmonic of the first resonant frequency and the length of the first radiator 21. Optionally, the length Ly of the second radiator 22 can be 7 mm.

[0046] Please combine Figure 9 and Figure 10 In some examples, the first resonant frequency is the UHF band, and the second resonant frequency is the GPSL5 band; the number of the second radiator 22 is one, and the third harmonic of the first resonant frequency has two peak currents along the length direction of the first radiator 21 (such as Figure 4 01 and 02 positions shown), one of the two peak currents is the peak current of the UHF band ( Figure 4 02 position in the middle), the second radiator 22 is set at the other peak current of the two peak currents ( Figure 4 01 position in the figure), and the second radiator 22 includes at least one coupling ring with an opening 221 provided therein. The opening 221 extends axially along the corresponding coupling ring to the corresponding end of the coupling ring. In this example, after the coupling ring is provided with opening 221, the S11 curve shifts toward lower frequencies, indicating that the impedance characteristics near the GPS L5 frequency band are gradually improving. The second radiator 22 and the first radiator 21 are mutually coupled and have a large capacitive reactance. With the opening 221 provided in the coupling ring, the capacitive reactance is weakened, the reactance gradually decreases, and the impedance curve shifts upward overall.

[0047] Frequency / Mhz Efficiency / % Efficiency / % Frequency / Mhz Efficiency / % Efficiency / % Baseline value Split coupling ring Baseline value Split coupling ring 400 24.55 23.77 1170 8.34 37.50 410 31.33 29.92 1175 8.28 39.72 420 35.65 34.20 1180 9.48 39.36 430 42.36 39.63 440 47.32 43.95 450 51.52 47.97 460 51.17 47.64 470 47.64 44.46

[0048] Table 1

[0049] Table 1 shows a comparison of the efficiency values of antenna 200 in darkroom tests at the UHF (400-470 MHz) band and near the GPS L5 band (1170-1180 MHz). The efficiency values at the corresponding frequencies for a constant-pitch helical antenna with a second radiator 22 formed by a coupling loop but without an opening in the loop are benchmark values. As can be seen from Table 1, because second radiator 22 is not positioned near the peak current of the UHF band, the efficiency values at 400-470 MHz do not change significantly, with minimal impact on the main frequency efficiency. However, the efficiency values at 1176 MHz vary significantly, as the third harmonic of first radiator 21 shifts toward lower frequencies. The efficiency of antenna 200 at 1176 MHz increases from 8.28% to 39.72%, significantly improving antenna efficiency.

[0050] Please combine Figure 11、 Figure 12 as well as Figure 13 In some examples, the first resonant frequency is the UHF band, the second resonant frequency is the GPS L1 band; the number of the second radiators 22 is two, and the fifth harmonic of the first resonant frequency has three peak currents along the length direction of the first radiator 21 (such as Figure 5 03, 04 and 05 positions shown), one of the three peak currents is the peak current of the UHF band (such as Figure 5 05 position as shown), the two second radiators 22 are respectively set at the other two peak currents of the three peak currents (such as Figure 5 03, 04 positions as shown). The two second radiators 22 in this example can be suspended and coupled with the first radiator 21 respectively. The second radiator 22 in this example is set to avoid the peak current 05 position of the 5th harmonic, and can tune the resonance point of the 5th harmonic to the frequency of GPS L1 without affecting the main frequency. Increasing the peak current of the 5th harmonic of the first resonant frequency approximately extends the current path. The extension of the path will cause the radiator to become equivalently longer in principle, thereby causing the frequency to shift to a low frequency, so as to tune the resonance point of the 5th harmonic to the frequency of GPS L1. Optionally, the length of the second radiator 22 in this example is not greater than the length of the path of the peak current of the second resonant frequency, 12L. From Figure 13 As can be seen in the figure, when the length of the second radiator 22 is 14 mm, 15 mm, and 16 mm, the S11 coefficient of the antenna 200 is -5.38 dB, -11.69 dB, and -9.37 dB, respectively. The reflection loss is very low, and the antenna performance is not affected by the reflected signal. In some examples, the length of the second radiator 22 can be determined based on the length of the path of the peak current of the harmonic of the first resonant frequency and the length of the first radiator 21. Optionally, the length Lz of the second radiator 22 can be 15.5 mm.

[0051] Please combine Figure 14 and Figure 15 In some examples, the first resonant frequency is the UHF band, the second resonant frequency is the GPSL1 band; the number of the second radiators 22 is two, and the fifth harmonic of the first resonant frequency has three peak currents along the length direction of the first radiator 21 (such as Figure 5 03, 04 and 05 positions shown), one of the three peak currents is the peak current of the UHF band (such as Figure 5 05 position as shown), the two second radiators 22 are respectively set at the other two peak currents of the three peak currents (such as Figure 503 and 04 as shown), and the second radiator 22 includes at least one coupling loop, which can be provided with an opening 221. After the coupling loop is provided with opening 221, the S11 curve shifts toward lower frequencies, indicating that the impedance characteristics near the GPS L1 frequency band are gradually improving. The second radiator 22 and the first radiator 21 are mutually coupled and have a large capacitive reactance. With the opening 221 of the coupling loop, the capacitive reactance is weakened, the reactance gradually decreases, and the impedance curve shifts upward overall.

[0052] Frequency / Mhz Efficiency / % Efficiency / % Frequency / Mhz Efficiency / % Efficiency / % Baseline value Split coupling ring Baseline value Split coupling ring 400 24.55 24.21 1570 10.21 45.84 410 31.33 30.69 1575 11.25 46.33 420 35.65 35.24 1580 12.16 45.84 430 42.36 40.74 440 47.32 45.19 450 51.52 48.75 460 51.17 48.19 470 47.64 44.67

[0053] Table 2

[0054] Table 2 shows a comparison of the efficiency values of antenna 200 in a darkroom test at the UHF (400-470 MHz) frequency band and near the GPS L1 frequency band (1570-1580 MHz). The efficiency values at the corresponding frequencies for a constant-pitch helical antenna with a second radiator 22 formed by a coupling loop but without an opening in the coupling loop are benchmark values. As can be seen from Table 2, because the second radiator 22 is not positioned near the peak current of the UHF band, the efficiency values at 400-470 MHz do not change significantly, and thus have little impact on the main frequency efficiency. However, the efficiency values at around 1575 MHz vary significantly, as the fifth harmonic of the first radiator 21 shifts toward lower frequencies. The efficiency of antenna 200 at 1575 MHz increases from 11.25% to 46.33%, significantly improving antenna efficiency.

[0055] Refer again Figure 1 、 Figure 2 , and combined with Figure 3-5 In some examples, the first resonant frequency is the UHF band, the number of the second resonant frequencies is two, and the two second resonant frequencies are the GPS L5 band and the GPS L1 band respectively; the number of the second radiators 22 is three, and the third harmonic of the first resonant frequency has two peak currents along the length direction of the first radiator 21 (such as Figure 4 01 and 02 positions shown), one of the two peak currents is the peak current of the UHF band ( Figure 4 02 position in the figure), one of the three second radiators 22 is set at the other peak current of the two peak currents ( Figure 4 01 position in the first resonant frequency); the 5th harmonic of the first radiator 21 has three peak currents along the length direction (such as Figure 5 03, 04 and 05 positions shown), one of the three peak currents is the peak current of the UHF band (such as Figure 5 05 position as shown), the other two of the three second radiators 22 are respectively set at the other two peak currents of the three peak currents (as shown in FIG. Figure 503, 04 positions as shown). The number of the second radiators 22 is three, and the three second radiators 22 are arranged at intervals along the length direction of the first radiator 21. The three second radiators 22 are respectively arranged at the peak current 01 of the 3rd harmonic, the peak current 03 and 04 of the 5th harmonic, and the resonance points of the 3rd harmonic and the 5th harmonic can be tuned to the frequency points of GPS L5 and GPS L1 respectively without affecting the main frequency. In this example, three sections of the second radiator 22 can be used, so that the three sections of the second radiator 22 correspond to the peak current 01 of the 3rd harmonic, the peak current 03 and 04 of the 5th harmonic, respectively, so that the antenna 200 can achieve narrowband and GPS dual-frequency functions. In this example, the position of each second radiator 22 can be determined according to the peak current points of the 3rd harmonic and the 5th harmonic of the first radiator 21. The three second radiators 22 can be arranged at intervals along the length direction of the first radiator 21. Optionally, the gap D3 between adjacent second radiators 22 is 8mm. The second second radiator 22 along the length of the first radiator 21 is used to tune the resonance point of the third harmonic to the GPS L5 frequency, and the first and third second radiators 22 are used to tune the resonance point of the fifth harmonic to the GPS L1 frequency. The three second radiators 22 are set to avoid the peak current of the main frequency, which can reduce the impact of the second radiators 22 on the main frequency of the first radiator 21. The second radiators 22 tune the resonance of the first radiator, so that the first radiator 21 and the second radiator 22 can achieve GPS dual-frequency bands.

[0056] Please refer to Figure 16 Based on the above example, the antenna 200 includes the three second radiators 22 described in the above example, and the three second radiators 22 each include a coupling loop. The coupling loops of the three second radiators 22 are each provided with an opening 221. Figure 16 As can be seen in the figure, compared to the constant-pitch helical antenna 200 without the coupling loop forming the second radiator 22, the resonance points of its third and fifth harmonics are not at the GPS L1 and L5 frequencies. In this example, after adding the coupling loop with opening 221, the resonance points of the third and fifth harmonics are shifted to lower frequencies, thereby tuning the resonance points to the GPS L1 and L5 frequencies. Furthermore, the coupling loop is designed to avoid the peak current in the UHF band and does not affect the main frequency.

[0057]

[0058] Table 3

[0059] Table 3 shows a comparison of the anechoic chamber efficiency values of antenna 200 in the UHF (400-470 MHz) band, the GPS L5 band (1170-1180 MHz), and the GPS L1 band (1570-1580 MHz). The efficiency values at the corresponding frequencies for a constant-pitch helical antenna with a second radiator 22 formed by a coupling loop but without an opening in the loop are used as a benchmark. As can be seen from Table 3, the resonance points of the third and fifth harmonics of the first radiator 21 shift toward lower frequencies. The efficiency of antenna 200 at 1175 MHz increases from 8.28% to 37.41%, and the efficiency at 1575 MHz increases from 11.25% to 42.28%.

[0060] Please refer to Figure 17 ,like Figure 17 The left column is the comparison of the field measurement and star search of the reference antenna 200. The reference antenna 200 is the antenna 200 composed of the first radiator 21 without the second radiator 22. The right column is the comparison of the field measurement and star search of the present application. Figure 17 It can be seen that the number of star searches and CN value of the solution in this application example have been improved to a certain extent.

[0061]

[0062]

[0063] Table 4

[0064] Table 4 compares the U-segment (400-470 MHz) pull-length of the present application with that of the reference value. The reference value is the U-segment pull-length effect of the constant-pitch helical antenna 200 without the second radiator 22. As can be seen from Table 4, the difference in the U-segment pull-length effect of the present application compared with the reference value is very small.

[0065] This application is aimed at the current terminal devices that have dual-frequency GPS or dual-frequency Beidou positioning requirements. By adding three second radiators 22 with openings 221 on the basis of the constant-spacing spiral antenna, the high-order resonance point of the first radiator 21 can be controlled, thereby realizing the dual-frequency positioning function.

[0066] The addition of three second radiators 22 in the example of this application is based on the current distribution of the high-order resonance point of the first radiator 21, and can be tuned by changing the resonant current distribution. The high-order resonance of the first radiator 21 is tuned by the three second radiators 22 structure, and the tuning offset is increased by setting openings 221 in the three second radiators 22. In order to avoid the impact of the addition of three second radiators 22 on the main frequency radiation efficiency, one second radiator 22 is used for the GPS L5 band, and the second radiator 22 includes a coupling loop with an opening 221. Two second radiators 22 are used for the GPS L1 band, and the two second radiators 22 include a coupling loop with an opening 221 to avoid the main frequency peak current distribution. Since a constant pitch spiral structure is used as the main radiator of the antenna 200, it helps to reduce the complexity of the structure, save the cost of the antenna 200, and reduce the complex process flow. Since the GPS tuning solution in the example of this application does not require the addition of branches, the impact of the problem of injection core deviation is reduced. Compared with other solutions, the GPS antenna 200 is compatible with multiple antenna 200 connection methods, such as a monopole connector, an SMA connector or welding, and is compatible with more terminal products.

[0067] In some examples, the coupling loops forming the three second radiators 22 are each provided with an opening 221. The openings 221 of the coupling loops of the three second radiators 22 are positioned toward the same side of the first radiator 21. This facilitates alignment and positioning of the second radiators 22 during installation, simplifies the installation process, and improves installation efficiency and accuracy. In this example, the widths of the openings 221 of the coupling loops of the three second radiators 22 can be equal or unequal, depending on the required offset for each resonance point.

[0068] Although the above examples only illustrate the second resonant frequency as the GPS L1 (1575MHz) frequency band and the GPS L5 (1176MHz) frequency band, this is not used to limit the present application. For the WIFI and Bluetooth frequency bands, the peak current of the main frequency can be avoided, and the second radiator 22 can be set at the peak current of the higher-order harmonics of the first resonant frequency to tune the resonance point of the higher-order harmonics to the required high-order resonance point, thereby realizing WIFI and Bluetooth functions. I will not go into details here.

[0069] Please refer again Figure 2In some examples, the first radiator 21 has a first end and a second end opposite each other. The distance between the second radiator 22 near the first end and the first end is a first distance D1, and the distance between the second radiator 22 near the second end and the second end is a second distance D2. The first distance D1 is not greater than the second distance D2. In this example, the first and second ends of the first radiator 21 can be two ends along the length of the first radiator 21. The second end can be used to connect to the feeding point of the main body 100 structure.

[0070] Please refer again Figure 1 Based on the above-mentioned antenna 200, this application also proposes an example of a terminal device, including a main body 100 and an antenna 200 as in any of the above-mentioned examples, and the antenna 200 is connected to the main body 100.

[0071] The main body 100 can be a walkie-talkie or other terminal device that requires the antenna 200 structure. In this example, the antenna 200 can be located at a corner of the main body 100. The main body 100 can have a feeding point for cooperating with the antenna 200, and the second end of the first radiator 21 of the antenna 200 can be connected to the feeding point of the main body 100.

[0072] It is understandable that the terminal device may also include other functional components, and reference may be made to related technologies.

[0073] The above is only an implementation method of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of this application, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. An antenna, characterized in that: include: a first radiator, wherein the first radiator generates a first resonant frequency; as well as At least one second radiator, each of the at least one second radiator is respectively arranged inside and outside the first radiator and suspended and coupled to form resonance, the at least one second radiator resonates with the first radiator to generate at least one second resonant frequency, and the second resonant frequency is different from the first resonant frequency.

2. The antenna according to claim 1, wherein The second radiator is disposed at a peak current of a harmonic of the first resonant frequency, wherein the peak current does not include a peak current of the first resonant frequency.

3. The antenna according to claim 2, wherein The length of the second radiator is not greater than the length of a path of a peak current of a harmonic of the first resonant frequency.

4. The antenna according to claim 3, wherein The first resonant frequency is a UHF frequency band, and / or the second resonant frequency includes a GPS L1 frequency band, a GPS L5 frequency band, a WIFI frequency band, and a Bluetooth frequency band.

5. The antenna according to claim 4, wherein The first resonant frequency is the UHF frequency band, and the second resonant frequency is the GPS L5 frequency band; the number of the second radiator is one, and the harmonic of the first resonant frequency has two peak currents along the length direction of the first radiator, one of the two peak currents is where the peak current of the UHF frequency band is located, and the second radiator is arranged at the location of the other peak current of the two peak currents, and the second radiator resonates with the first radiator to generate the GPS L5 frequency band.

6. The antenna according to claim 4, wherein The first resonant frequency is the UHF frequency band, and the second resonant frequency is the GPS L1 frequency band; the number of the second radiators is two, and the harmonics of the first resonant frequency have three peak currents along the length direction of the first radiator, one of the three peak currents is where the peak current of the UHF frequency band is located, and the two second radiators are respectively arranged at the locations of the other two peak currents of the three peak currents, and the two second radiators resonate with the first radiator to generate the GPS L1 frequency band.

7. The antenna according to claim 4, wherein The first resonant frequency is the UHF band, the number of the second resonant frequencies is two, and the two second resonant frequencies are the GPS L5 band and the GPS L1 band respectively; the number of the second radiators is three, the harmonic of the first resonant frequency has two peak currents along the length direction of the first radiator, one of the two peak currents is where the peak current of the UHF band is located, and one of the three second radiators is arranged at the other peak current of the two peak currents; the harmonic of the first resonant frequency has three peak currents along the length direction of the first radiator, one of the three peak currents is where the peak current of the UHF band is located, and the other two of the three second radiators are respectively arranged at the other two peak currents of the three peak currents.

8. The antenna according to any one of claims 1 to 7, characterized in that The first radiator is a spiral structure, and the pitch of the spiral structure is a constant pitch.

9. The antenna according to claim 8, wherein The second radiator includes at least one coupling loop.

10. The antenna according to claim 9, wherein The coupling ring in at least one of the second radiators is provided with an opening, and the opening is provided along the axial direction of the corresponding coupling ring to the end of the corresponding coupling ring.

11. The antenna according to claim 10, wherein The antenna further comprises: The shell is sleeved on the periphery of the first radiator, and the at least one second radiator is nested inside and outside the shell respectively.

12. The antenna according to claim 11, wherein The width of the opening along the circumferential direction of the housing is w, and the inner diameter of the portion of the housing corresponding to the first radiator is R, wherein the width w of the opening along the circumferential direction of the housing and the inner diameter R of the portion of the housing corresponding to the first radiator satisfy the following relationship: 0≤w≤0.5R.

13. A terminal device, characterized in that: include: main body; as well as The antenna according to any one of claims 1 to 12, wherein the antenna is connected to the main body.

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