An antenna and a terminal

Abstract

The present application provides an antenna and terminal, comprising a first radiator, a second radiator, and a feed source. The first radiator has a first feed point and a first ground point; the second radiator has a second feed point and a second ground point. The antenna also includes a connecting line having a first end and a second end opposite each other, the first end connected to the first feed point of the first radiator, and the second end connected to the second feed point of the second radiator. The connecting line is provided with a feed point connected to the feed source. There is no other direct electrical connection between the first radiator and the second radiator other than the connecting line. When feeding the first radiator and the second radiator with different current path lengths, the antenna performance bandwidth can be improved, thereby enhancing the antenna performance.

Description

[0001] This application is a divisional application. The application number of the original application is 202010247465.2, and the original application date is March 31, 2020. The entire content of the original application is incorporated into this application by reference. Technical Field

[0002] The present application relates to the field of antenna technology, and in particular to an antenna and a terminal. Background Art

[0003] With the rapid development of key technologies such as curved and flexible screens, mobile devices, particularly mobile phones, are becoming increasingly thinner and lighter, with an extreme screen-to-body ratio. This design significantly compresses antenna space. Furthermore, the increasing demand for mobile phone features, such as photography, has led to an increase in the number and size of cameras, further complicating overall antenna design. In this demanding environment, designing multi-antenna systems often results in insufficient space, or poor system isolation and ECC (Envelope Correlation Coefficient) after layout, making it difficult to meet the performance requirements of the communication bands. In particular, given the current state of mobile phone communication bands, 3G, 4G, and 5G will continue to coexist for a long time. This will require an increasing number of antennas, wider frequency coverage, and increasingly severe mutual interference. Summary of the Invention

[0004] The present application provides an antenna and a terminal for improving the isolation of the antenna, thereby improving the communication effect of the terminal.

[0005] In a first aspect, an antenna is provided for use in a terminal, the antenna comprising a first radiator, a second radiator, and a feed source, wherein the first radiator has a first feeding point and a first grounding point; the second radiator has a second feeding point and a second grounding point; in addition, the antenna further comprises a connecting line, the connecting line having a first end and a second end opposite to each other, the first end being connected to the first feeding point of the first radiator, and the second end being connected to the second feeding point of the second radiator; a feeding point being provided on the connecting line, the feeding point being connected to the feed source; wherein, except for the connecting line, there is no other direct electrical connection between the first radiator and the second radiator. In the above technical solution, the feed source feeds different first and second radiators through the connecting line, thereby generating more resonances and improving the bandwidth of the antenna.

[0006] In a specific embodiment, both ends of the first radiator are open ends, the second grounding point of the second radiator is located at one end of the second radiator, and the other end of the second radiator is open end, thereby increasing the isolation between the two radiators.

[0007] In one specific embodiment, the terminal has a metal frame having a plurality of openings therein, the plurality of openings dividing the metal frame into a plurality of metal segments; the first radiator and the second radiator are two different metal segments on the metal frame, and the metal frame serves as the radiator of the antenna.

[0008] In a specific embodiment, the metal frame has two opposite long side walls and two opposite short side walls;

[0009] The first radiator includes a portion of one long side wall and a portion of one short side wall; the second radiator is a portion of the other long side wall. The spacing between the radiators is increased.

[0010] In a specific embodiment, the metal frame has two opposite long side walls and two opposite short side walls; the first radiator is a part of one of the long side walls; and the second radiator is a part of the other long side wall. The spacing between the radiators is increased.

[0011] In a specific embodiment, the metal frame has two opposite long side walls and two opposite short side walls;

[0012] The first radiator includes a portion of one long side wall and a portion of one short side wall, and the second radiator includes a portion of the other long side wall and a portion of one short side wall.

[0013] In a specific possible implementation manner, the first end and the second end of the connecting line are connected to the two long side walls in a one-to-one correspondence.

[0014] In one specific embodiment, the terminal includes a circuit board, and the feed source is disposed on the circuit board. Along the length of the short sidewall, the first and second ends of the connecting wire span the gap between the circuit board and the metal frame and connect to the two long sidewalls of the metal frame, thereby connecting the connecting wire to the radiator.

[0015] In a specific embodiment, two opposing brackets are provided in the terminal; the first radiator is a metal layer provided on one of the brackets; and the second radiator is a metal layer provided on the other bracket. The two radiators are supported by the brackets.

[0016] In a specific embodiment, the antenna further includes a first feeding network; the negative electrode of the feed source is grounded, and the positive electrode of the feed source is connected to the feeding point through the first feeding network, thereby improving the feeding effect.

[0017] In a specific possible implementation scheme, the feeding point is connected to a first metal wire, the positive electrode of the feed source is connected to an end of the first metal wire away from the feeding point, and the end of the first metal wire away from the feeding point is also connected to a second metal wire and a third metal wire, wherein the ends of the second metal wire and the third metal wire away from the first metal wire are respectively grounded.

[0018] In a specific implementation manner, the first matching network includes a first capacitor provided on the first metal line, a first inductor provided on the third metal line, and a second inductor provided on the second metal line.

[0019] In a specific embodiment, the connecting line includes a first connecting line and a second connecting line;

[0020] The first connecting line is connected to the first radiator; the second connecting line is connected to the second radiator;

[0021] The end of the first connecting line away from the first radiator is connected to a fourth metal line, and one end of the fourth metal line away from the first connecting line is grounded; the end of the second connecting line away from the second radiator is connected to a fifth metal line, and one end of the fifth metal line away from the second connecting line is grounded;

[0022] The positive electrode of the feed source is connected to the fifth metal wire, and the negative electrode of the feed source is connected to the fourth metal wire.

[0023] In one specific embodiment, the antenna further includes a second matching network; the second matching network includes a third inductor, a fourth inductor, and a second capacitor; wherein the third inductor is disposed on the fifth metal line, the fourth inductor is disposed on the fourth metal line, and the second capacitor is disposed between the first connecting line and the second connecting line. This improves antenna performance.

[0024] In a second aspect, an antenna is provided, comprising a radiator and a feeding network, wherein the radiator comprises a first radiator and a second radiator arranged symmetrically; the lengths of the first radiator and the second radiator can be determined as needed and are not specifically limited herein. The feeding network is used to feed the first radiator and the second radiator respectively; wherein the feeding network comprises a first feeding network and a second feeding network; the first feeding network comprises: a first feed source, a first feed line, and a second feed line; wherein the negative pole of the first feed source is grounded, and the positive pole of the first feed source is connected to the first feed line and the second feed line; the first feed line is connected to the first radiator, and the second feed line is connected to the second radiator; the second feeding network comprises: a second feed source, the second feeding network comprises a feed source, a third feed line, and a fourth feed line; wherein the positive pole of the second feed source is connected to the third feed line, and the negative pole of the second feed source is connected to the fourth feed line; the third feed line is connected to the first radiator, and the fourth feed line is connected to the second radiator. In the above technical solution, by using the first feeding network and the second feeding network to feed the first radiator and the second radiator with approximately equal current path lengths, the isolation of the antenna can be improved. When the first feeding network or the second feeding network is used to feed the first radiator and the second radiator with different current path lengths, the bandwidth of the antenna performance can be improved, thereby enhancing the performance of the antenna.

[0025] In a specific possible implementation scheme, the first feed line is connected to the second feed line, and a first metal wire is connected to the connection between the first feed line and the second feed line, and the positive electrode of the first feed source is connected to the end of the first metal wire away from the first feed line; the end of the first metal wire away from the first feed line is respectively connected to a second metal wire and a third metal wire, and the ends of the second metal wire and the third metal wire away from the first metal wire are respectively grounded.

[0026] In a specific implementation scheme, the positive electrode of the first feed source is connected to the first feed line and the second feed line through a first matching network, thereby improving the performance of the antenna.

[0027] In a specific embodiment, the first matching network includes a first capacitor provided on the first metal line, a first inductor provided on the third metal line, and a second inductor provided on the second metal line, thereby improving the performance of the antenna.

[0028] In a specific embodiment, the first end of the third feeder is electrically connected to the first radiator; the first end of the fourth feeder is connected to the second radiator;

[0029] The second end of the third feed line is connected to a fourth metal wire, and an end of the fourth metal wire away from the third feed line is grounded; the second end of the fourth feed line is connected to a fifth metal wire, and an end of the fifth metal wire away from the fourth feed line is grounded; the positive electrode of the second feed source is connected to the fifth metal wire, and the negative electrode of the second feed source is connected to the fourth metal wire.

[0030] In a specific implementation scheme, the second feed source is connected to the third feed line and the fourth feed line via a second matching network, thereby improving the performance of the antenna.

[0031] In one specific embodiment, the second matching network includes a third inductor, a fourth inductor, and a second capacitor; wherein the third inductor is disposed on the fifth metal line, the fourth inductor is disposed on the fourth metal line, and the second capacitor is disposed between the second end of the third feed line and the second end of the fourth feed line. This improves antenna performance.

[0032] In a specific implementation manner, the ratio of the current path length of the first radiator to the current path length of the second radiator is between 0.8 and 1.2.

[0033] In a specific embodiment, the current path length of the first radiator is the same as the current path length of the second radiator.

[0034] In a specific embodiment, one end of the first radiator is suspended in the air and the other end is grounded; one end of the second radiator is suspended in the air and the other end is grounded;

[0035] The suspended end of the first radiator and the suspended end of the second radiator are located on the same side; or the suspended end of the first radiator and the suspended end of the second radiator are located on different sides. The grounding of the antenna radiator can be set in different forms.

[0036] In a specific implementation manner, the current path lengths of the first radiator and the second radiator are both one-quarter of the wavelength corresponding to the operating frequency band of the antenna.

[0037] In a specific possible implementation manner, a phase shifter is provided on the feeder line of the feed network.

[0038] In a third aspect, a terminal is provided, comprising a housing and any of the above-described antennas or antenna arrays disposed within the housing. In the above technical solution, by using a first feeding network and a second feeding network to feed a first radiator and a second radiator having approximately equal current path lengths, antenna isolation can be improved. When using the first feeding network or the second feeding network to feed the first radiator and the second radiator having different current path lengths, power can be fed simultaneously to the first and second antennas, thereby improving the antenna performance bandwidth and enhancing antenna performance.

[0039] In a specific embodiment, the housing is a metal housing, and the metal housing includes multiple metal segments, and the first radiator and the second radiator are two metal segments of the multiple metal segments, so as to facilitate antenna installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 The traditional MIMO dual-antenna design is shown in FIG;

[0041] Figure 2 A low-frequency antenna provided by an embodiment of the present application is shown;

[0042] Figure 3 Shows the specific structure of the ant1 antenna;

[0043] Figure 4 Shows the specific structure of the ant2 antenna;

[0044] Figure 5 shows a set of reflection coefficient curves of antenna ant1 and ant2 simulation;

[0045] Figure 6a shows the current distribution of the ant1 antenna at 0.82 GHz;

[0046] Figure 6b shows the current distribution of the ant1 antenna at 0.9 GHz;

[0047] Figure 6c shows the current distribution of the ant2 antenna at 0.8 GHz;

[0048] Figure 6d shows the current distribution of the ant2 antenna at 0.89 GHz;

[0049] Figure 7a shows the radiation pattern of the ant1 antenna at 0.82 GHz;

[0050] Figure 7b shows the radiation pattern of the ant1 antenna at 0.9 GHz;

[0051] Figure 7c shows the radiation pattern of the ant2 antenna at 0.8 GHz;

[0052] Figure 7d shows the radiation pattern of the ant2 antenna at 0.89 GHz;

[0053] Figure 8 shows the transmission coefficient between the ant1 and ant2 antennas;

[0054] Figure 9 shows the efficiency curves of ant1 and ant2 antennas;

[0055] Figure 10 The structure of another antenna provided by an embodiment of the present application is shown;

[0056] Figure 11 Shows the specific structure of the ant1 antenna;

[0057] Figure 12 Shows the specific structure of the ant2 antenna;

[0058] Figure 13 shows a set of reflection coefficient curves of antenna ant1 and ant2 simulation;

[0059] Figure 14a shows the current distribution of the ant1 antenna at 0.82 GHz;

[0060] Figure 14b shows the current distribution of the ant1 antenna at 0.88 GHz;

[0061] Figure 14c shows the current distribution of the ant2 antenna at 0.84 GHz;

[0062] Figure 15a shows the radiation pattern of the ant1 antenna at 0.82 GHz;

[0063] Figure 15b shows the radiation pattern of the ant1 antenna at 0.88 GHz;

[0064] Figure 15c shows the radiation pattern of the ant2 antenna at 0.84 GHz;

[0065] Figure 16 shows the transmission coefficient between the ant1 and ant2 antennas;

[0066] Figure 17 shows the efficiency curves of ant1 and ant2 antennas;

[0067] Figure 18A single-feed antenna provided by the present application is shown;

[0068] Figure 19 Shown Figure 18 A set of reflection coefficient curves for the antenna simulation shown;

[0069] Figure 20 Shown Figure 18 The efficiency of the antenna shown is compared to that of the T antenna when only the T is excited;

[0070] Figure 21a The figure shows the current flowing in the second radiator of the antenna at a frequency band of 0.82 GHz; Figure 21b The figure shows the current flowing in the first radiator of the antenna at a frequency band of 0.88 GHz;

[0071] Figure 21c The figure shows the current flowing in the first radiator of the antenna at a frequency band of 0.96 GHz;

[0072] Figure 22a shows the radiation direction of the antenna in the 0.82 GHz frequency band;

[0073] Figure 22b The radiation direction of the antenna in the frequency band of 0.88 GHz is shown;

[0074] Figure 22c The radiation direction of the antenna in the frequency band of 0.96 GHz is shown;

[0075] Figure 23 An e-single-feed antenna provided in an embodiment of the present application is shown;

[0076] Figure 24 Shown Figure 23 A set of reflection coefficient curves for the antenna simulation shown;

[0077] Figure 25 Shown Figure 23 the efficiency of the antenna shown;

[0078] Figure 26a Shown Figure 23 Current distribution of the antenna shown at 2.01 GHz;

[0079] Figure 26b Shown Figure 23 Current distribution of the antenna shown at 2.31 GHz;

[0080] Figure 26c Shown Figure 23 Current distribution of the antenna shown at 2.59 GHz;

[0081] Figure 27a Shown Figure 23The radiation pattern of the antenna shown at 2.01 GHz;

[0082] Figure 27b Shown Figure 23 Radiation pattern of the antenna shown at 2.31 GHz;

[0083] Figure 27c Shown Figure 23 Radiation pattern of the antenna shown at 2.59 GHz;

[0084] Figure 28 Shows this application Figure 2 Schematic diagram of the structure of the antenna in a mobile phone;

[0085] Figure 29 Another antenna structure provided by an embodiment of the present application is illustrated. DETAILED DESCRIPTION

[0086] In order to make the purpose, technical solutions and advantages of this application clearer, this application will be further described in detail below with reference to the accompanying drawings.

[0087] For ease of understanding, let's first explain the application scenarios of the antenna provided in the embodiment of the present application. The antenna provided in the embodiment of the present application is applied to electronic devices such as mobile phones, tablet computers, PCs, routers, and wearable devices. Taking a mobile phone as an example, the mobile phone includes a metal shell, which includes multiple metal segments. The multiple metal segments are electrically isolated, and some of the metal segments can be used as radiators of the antenna. Figure 1 The example in the text illustrates a traditional MIMO dual-antenna design. The antennas are far apart, occupying a large area on the phone as a whole. Moreover, when covering a single low-frequency band, the isolation is only 10dB, and the ECC is around 0.4. The situation is also the same for medium and high-frequency MIMO antennas. In the mobile phone communication frequency band, 3G, 4G, and 5G bands will coexist for a long time. The number of antennas will increase, the frequency band coverage will become wider, and the mutual influence will become more and more serious. For this reason, the embodiment of the present application provides an antenna, which is described in detail below with reference to specific drawings and embodiments.

[0088] First of all, the antenna provided in the embodiment of the present application can be applied to communication systems that have been adopted or will be used by the terminal, such as: LTE (Long Term Evolution) system, Wifi, SUB-6G, 5G, etc. The antenna in the following example does not highlight the requirements of the communication network, but only illustrates the working characteristics of the antenna in terms of frequency.

[0089] Secondly, the antenna simulations provided in the embodiments of this application are based on the following environment: the mobile phone housing has a metal frame, and the space enclosed by the metal frame contains a PCB board and an LDS bracket. The metal frame, LDS bracket, and PCB board are known structures in existing mobile phones and are therefore not described in detail here. The metal frame is 4mm thick and 3mm wide, and the antenna clearance in the Z-direction (perpendicular to the terminal display plane) is 1mm. The slots on the metal frame are 2mm wide. The dielectric constant of the filling material between the LDS bracket, the metal frame slot, and the metal frame and the floor is 3.0, and the loss angle is 0.01.

[0090] like Figure 2 As shown, Figure 2 The example shows a low-frequency antenna provided by an embodiment of the present application. The low-frequency antenna includes two symmetrically arranged radiators, which are named as the first radiator 10 and the second radiator 20 for the convenience of description. The first radiator 10 and the second radiator 20 adopt an IFA structure in the form of a metal frame. The first radiator 10 and the second radiator 20 are symmetrically arranged relative to the axis O of the mobile phone. The lower end of each radiator is grounded and the upper end is open (with Figure 2 The direction of prevention of the middle terminal is the reference direction). In the embodiment of the present application, the length of each radiator is not limited, such as the ratio of the current path length of the first radiator 10 to the current path length of the second radiator 20 is between 0.8 and 1.2. It is only necessary that the current path length of the first radiator 10 is the same or approximately the same as the current path length of the second radiator 20. The length of each radiator can be set as needed. For example, the length of each radiator is approximately 1 / 4 of the wavelength corresponding to the working frequency band of the low-frequency antenna, such as a length corresponding to 1 / 6 to 1 / 3 of the wavelength corresponding to the working frequency band of the low-frequency antenna, such as 1 / 6, 1 / 4, 1 / 3 of the wavelength, etc. In addition, the first radiator 10 and the second radiator 20 provided in the embodiment of the present application are not limited to Figure 2 The IFA structure is formed in the form of a metal frame as shown in FIG. , and other forms may be used, such as a flexible circuit, a metal layer, or a printed circuit on a printed circuit board.

[0091] Continue to refer Figure 2 The low-frequency antenna provided in the embodiment of the present application further includes a feeding network. Figure 2 The feeding network in the embodiment includes two parts: a first feeding network 40 and a second feeding network 30. For example, the first feeding network 40 is a symmetrical feeding network, and the second feeding network 30 can be an anti-symmetrical feeding network. Figure 2 The low-frequency antenna shown in the figure includes two sub-antennas: an ant1 antenna, in which a second feeding network 30 is connected to a first radiator 10 and a second radiator 20 respectively; and an ant2 antenna, in which a first feeding network 40 is connected to a first radiator 10 and a second radiator 20 respectively.

[0092] like Figure 3 As shown in Figure 3 The specific structure of the ant1 antenna is shown in the example. The ant1 antenna includes a first radiator 10, a second radiator 20 and a second feeding network 30. The second feeding network 30 is an antisymmetric feeding network, which includes: a second feed source 31, a third feed line 32 and a fourth feed line 33. Figure 3 As shown in , a third feed line 32 and a fourth feed line 33 are provided on the PCB board 100. The third feed line 32 and the fourth feed line 33 may be printed circuits or metal layers. The first end of the third feed line 32 extends from the PCB board 100 to the first radiator 10 and is electrically connected to the first radiator 10, or the first end of the third feed line 32 is connected to the first radiator 10 via a metal wire; the first end of the fourth feed line 33 extends from the PCB board 100 to the second radiator 20 and is connected to the second radiator 20, or the fourth feed line 33 is connected to the second radiator 20 via a metal wire. Between the second end of the third feed line 32 and the second end of the fourth feed line 33 is the second feed source 31 of the second feeding network 30. Figure 3 As shown in FIG, the second end of the third feed line 32 is connected to the fourth metal wire 38, and the end of the fourth metal wire 38 away from the third feed line 32 is grounded; the second end of the fourth feed line 33 is connected to the fifth metal wire 37, and the end of the fifth metal wire 37 away from the fourth feed line 33 is grounded; wherein the third feed line 32 and the fourth feed line 33 are arranged in a symmetrical manner, and the fourth metal wire 38 and the fifth metal wire 37 are also arranged in a symmetrical manner. Figure 3 As shown in FIG, the negative electrode (- in the figure) of the second feed source 31 is connected to the third feed line 32 via a fourth metal wire 38, and the positive electrode (+ in the figure) of the second feed source 31 is connected to the fourth feed line 33 via a fifth metal wire 37. Through the third feed line 32 and the fourth feed line 33, a connecting "bridge" structure is formed between the second feeding network 30 and the two radiators.

[0093] exist Figure 3In the embodiment, the third feed line 32 and the fourth feed line 33 are arranged symmetrically so that the current path lengths of the third feed line 32 and the fourth feed line 33 are the same; the fourth metal line 38 and the fifth metal line 37 are arranged symmetrically so that the current path lengths of the fourth metal line 38 and the fifth metal line 37 are the same. However, in actual configuration, due to assembly errors or space issues for the second feed source 31, there may be differences between the third feed line 32 and the fourth feed line 33, or between the fourth metal line 38 and the fifth metal line 37. When differences arise, a symmetrical matching network design can optionally be added to the second feed network 30, which will be referred to as a second matching network for ease of description. Exemplarily, the second matching network can include a third inductor 35, a fourth inductor 36, and a second capacitor 34; wherein the third inductor 35 is arranged on the fifth metal line 37, the fourth inductor 36 is arranged on the fourth metal line 38, and the second capacitor 34 is arranged between the second end of the third feed line 32 and the second end of the fourth feed line 33. By adjusting the inductance of the third inductor 35 or the fourth inductor 36, the deviation between the current path length from the second feed source 31 to the first radiator 10 and the current path length from the second feed source 31 to the second radiator 20 can be adjusted so that the two are equal. Figure 3 The second feeding network shown in the figure is only an example and may also include only the third inductor, or only the fourth inductor or other matching networks. In actual use, the inductor or capacitor can be selected as needed to form the required matching network.

[0094] like Figure 4 As shown, Figure 4 The structure of the ant2 antenna is shown in the figure. The ant2 antenna includes a first radiator 10, a second radiator 20 and a first feeding network 40. The first feeding network 40 is a symmetrical feeding network, which includes: a first feed source 41, a first feeding line 42 and a second feeding line 43. Figure 4 In the embodiment, the first feed line 42 and the second feed line 43 can be an integral structure. The end of the first feed line 42 away from the second feed line 43 is connected to the first radiator 10, and the end of the second feed line 43 away from the first feed line 42 is connected to the second radiator 20. The first feed line 42 and the second feed line 43 are arranged symmetrically, and the current paths of the two feed lines are equal in length. A first metal wire 46 is connected to the junction of the first feed line 42 and the second feed line 43. The positive electrode of the first feed source 41 is connected to the end of the first metal wire 46 away from the first feed line 42, and the negative electrode of the first feed source 41 is grounded. The end of the first metal wire 46 away from the first feed line 42 is connected to a second metal wire 47 and a third metal wire 49, respectively. The ends of the second metal wire 47 and the third metal wire 49 away from the first metal wire 46 are grounded.

[0095] Optionally, the symmetrical feeding network may further include a first matching network, through which the current fed from the first feed source 41 to the radiators (the first radiator 10 and the second radiator 20) may be adjusted. Figure 4 As shown in FIG, the first matching network includes a first capacitor 44 provided on a first metal line 46, a first inductor 45 provided on a third metal line 49, and a second inductor 48 provided on a second metal line 47. By adjusting the capacitance of the first capacitor 44, the inductance of the first inductor 45, and the second inductor 48, the current fed from the first feed source 41 to the radiator can be adjusted. Of course, it should be understood that Figure 4 The first matching network shown in FIG is only a specific example. The first matching network can select different capacitors or inductors as needed to adjust the current fed from the first feed source 41 to the radiator.

[0096] To facilitate understanding of the isolation effect between the ant1 antenna and the ant2 antenna, the ant1 antenna and the ant2 antenna are simulated below. Figure 5 The following shows a set of reflection coefficient curves for the simulated antennas ant1 and ant2, where S11 is the reflection coefficient of ant1 under asymmetric feeding, and S12 is the reflection coefficient of ant2 under symmetric feeding. The reflection curve for ant1 contains two resonant modes with resonant frequencies around 0.82 GHz and 0.9 GHz, respectively. At these two resonant frequencies, the currents on the radiator point in opposite directions. The reflection curve for ant2 also contains two resonant modes with resonant frequencies around 0.8 GHz and 0.89 GHz, respectively. At these two resonant frequencies, the currents on the radiator point in the same direction. This is explained below using the current simulation graphs for the two antennas.

[0097] like Figure 6a As shown, Figure 6a The current distribution of the ant1 antenna at 0.82 GHz is shown in Figure 6a The placement direction of the ant1 antenna shown is the reference direction, as shown in Figure 6a As shown by the arrows in , the current on the first radiator 10 flows from top to bottom, and the current on the second radiator 20 flows from bottom to top. The current directions on the first radiator 10 and the second radiator 20 are opposite. Figure 6b As shown, Figure 6b The current distribution of the ant1 antenna at 0.9 GHz is shown in Figure 6b The placement direction of the ant1 antenna shown is the reference direction, as shown in Figure 6b As shown by the arrows in , the current on the first radiator 10 flows from bottom to top, and the current on the second radiator 20 flows from top to bottom. The current directions on the first radiator 10 and the second radiator 20 are opposite. Figure 6c and Figure 6dAs shown, Figure 6c As shown, Figure 6c The current distribution of ant2 antenna at 0.8GHz is shown; Figure 6c The placement direction of the ant1 antenna shown is the reference direction, as shown in Figure 6c As shown by the arrows in , the current on the first radiator 10 and the current on the second radiator 20 both flow from bottom to top, and the current directions on the first radiator 10 and the second radiator 20 are the same; Figure 6d As shown, Figure 6d Figure 2 shows the current distribution of the ant2 antenna at 0.89 GHz. Figure 6d The placement direction of the ant1 antenna shown is the reference direction, as shown in Figure 6d As shown by the arrows in , the current on the first radiator 10 and the current on the second radiator 20 both flow from top to bottom, and the current directions on the first radiator 10 and the second radiator 20 are the same. Figure 6a and Figure 6c , and contrast Figure 6b and Figure 6d It can be seen that the current directions of the ant1 antenna and the ant2 antenna on the radiator are opposite, which can effectively improve the isolation between the ant1 antenna and the ant2 antenna.

[0098] like Figure 7a As shown, Figure 7a The figure shows the radiation pattern of the ant1 antenna at 0.82 GHz. The radiation direction of the ant1 antenna is vertical. The darker gray areas in the amplitude diagram represent stronger radiation, and the white areas represent weaker radiation. Figure 7b As shown, Figure 7b The figure shows the radiation pattern of the ant1 antenna at 0.7GHz. The radiation direction of the ant1 antenna is vertical. The darker gray areas in the amplitude diagram represent stronger radiation, and the white areas represent weaker radiation. Figure 7c As shown, Figure 7c The figure shows the radiation pattern of the ant2 antenna at 0.8 GHz. The radiation direction of the ant2 antenna is horizontal. The darker gray areas in the amplitude diagram represent stronger radiation, and the white areas represent weaker radiation. Figure 7d As shown, Figure 7d The figure shows the radiation pattern of the ant2 antenna at 0.87GHz. The radiation direction of the ant2 antenna is horizontal. The darker gray areas in the amplitude diagram represent stronger radiation, and the white areas represent weaker radiation. Figure 7a and Figure 7c , and contrast Figure 7b and Figure 7dIt can be seen that the radiation directions of the ant1 antenna and the ant2 antenna are perpendicular, so there can be relatively good isolation between the two antennas.

[0099] To better understand the relationship between the ant1 antenna and the ant2 antenna provided in the embodiment of the present application. Figure 8 , Figure 8 The transmission coefficient between ant1 and ant2 antennas is shown, S21 is the transmission coefficient between the two antennas, and is given by Figure 8 It can be seen that the maximum transmission coefficient is -20dB, and the isolation between antennas is opposite to the transmission coefficient, so Figure 8 It can be seen that the isolation between the ant1 antenna and the ant2 antenna can reach more than 20dB.

[0100] Figure 9 The efficiency curves of ant1 and ant2 antennas are shown. The solid line is the system efficiency and the dotted line is the radiation efficiency. Figure 9 It can be seen that when the efficiency of ant1 antenna is -5dB, the corresponding frequency band bandwidth reaches more than 100MHz and the radiation efficiency is more than -3dB. When the efficiency of ant2 antenna is -4dB, the corresponding frequency band bandwidth is 200MHz; the radiation efficiency is -dB; Figure 9 It can be seen that the frequency bands of the ant1 antenna and the ant2 antenna are both within the radiation frequency band.

[0101] As can be seen from the above description, in the antenna disclosed in the present application, for two radiators with the same electrical length, they are connected by the first feeding network 40 and the second feeding network 30, which generally forms a high-isolation antenna pair. The performance of the two antennas is relatively close, and can be used in MIMO or multi-CA antenna systems. In particular, the two antennas with a symmetrical structure have balanced performance in the left and right hands of each antenna, and the overall performance is better than that of a single radiator.

[0102] like Figure 10 As shown, Figure 10 The structure of another antenna provided in an embodiment of the present application is illustrated. Figure 10 The antenna shown is considered a low frequency antenna. Figure 2 The difference between the low frequency antenna shown is Figure 10 The first radiator 10 and the second radiator 20 of the low-frequency antenna are arranged in an asymmetrical manner.

[0103] like Figure 10 As shown in FIG, the first radiator 10 and the second radiator 20 adopt an IFA structure with a metal frame. The first radiator 10 is located in the upper middle part of the left side frame of the mobile phone (with Figure 10The placement direction of the mobile phone in the middle is the reference direction, the side frame close to the position of the mobile phone receiver), the lower end of the first radiator 10 is grounded and the upper end is open. The second radiator 20 is arranged in the middle and lower part of the right side frame of the mobile phone shell, the upper end of the second radiator 20 is grounded, and the lower end is open. And the current path length of the first radiator 10 is the same or approximately the same as the current path length of the second radiator 20. The length of each radiator can be set as needed. For example, the length of each radiator is approximately 1 / 4 of the wavelength corresponding to the working frequency band of the low-frequency antenna, such as the length corresponding to 1 / 6 to 1 / 3 of the wavelength corresponding to the working frequency band of the low-frequency antenna, etc., specifically it can be 1 / 6, 1 / 4, 1 / 3 of the wavelength, etc. In addition, the first radiator 10 and the second radiator 20 provided in the embodiment of the present application are not limited to Figure 10 The IFA structure is formed in the form of a metal frame as shown in FIG. , and other forms may be used, such as a flexible circuit, a metal layer, or a printed circuit on a printed circuit board.

[0104] Continue to refer Figure 10 The low-frequency antenna provided in the embodiment of the present application further includes a feeding network. Figure 10 The feeding network in the embodiment includes two parts: a first feeding network 40 and a second feeding network 30 . Figure 10 The low-frequency antenna shown in the figure consists of two sub-antennas: Figure 11 The ant1 antenna shown in FIG. 1 includes a second feeding network 30 connected to the first radiator 10 and the second radiator 20, wherein the structure of the second feeding network 30 can refer to FIG. Figure 4 Related description in . Figure 12 The ant2 antenna shown in FIG. 1 includes a first feeding network 40 connected to the first radiator 10 and the second radiator 20. The structure of the first feeding network 40 can be referred to FIG. Figure 5 Related description in .

[0105] To facilitate understanding of ant1 antenna and ant2 antenna, they are simulated. Figure 13 The figure shows a set of reflection coefficient curves from antenna simulations, where S11 is the reflection coefficient of ant1 antenna under asymmetric feeding, and S22 is the reflection coefficient of ant2 antenna under symmetric feeding. The reflection curve for ant1 contains two resonant modes with resonant frequencies near 0.82 GHz and 0.88 GHz, respectively. At these two resonant frequencies, the current flowing through the radiator has the same direction. The reflection curve for ant2 has only one resonant mode with a resonant frequency near 0.84 GHz. At this resonant frequency, the current flowing through the radiator has opposite directions. The following illustrates this with reference to the current simulation graphs for the two antennas.

[0106] like Figure 14a As shown, Figure 14aThe current distribution of the ant1 antenna at 0.82 GHz is shown in Figure 2. Figure 14a In the direction of the arrow shown in FIG, the current flowing direction of the first radiator 10 and the second radiator 20 is from the upper end to the lower end of each radiator (with Figure 14a The placement direction of the antenna shown in FIG is a reference direction), and the currents on the first radiator 10 and the second radiator 20 flow in the same direction. Figure 14b As shown, Figure 14b The current distribution of the ant1 antenna at 0.88 GHz is shown in Figure 2. Figure 14b As shown by the arrows in FIG, the current flows from the first radiator 10 and the second radiator 20 to the lower end of each radiator (in Figure 14a The placement direction of the antenna shown in FIG is a reference direction), and the currents on the first radiator 10 and the second radiator 20 flow in the same direction. Figure 14c As shown, Figure 14c Figure 2 shows the current distribution of the ant2 antenna at 0.84 GHz. Figure 14c In the direction indicated by the arrows, the current on the first radiator 10 flows from the lower end to the upper end of the first radiator 10, and the current on the second radiator 20 flows from the upper end to the lower end of the first radiator 10. The current flow direction on the first radiator 10 is opposite to the current flow direction on the second radiator 20. Figure 14a and Figure 14c , and contrast Figure 14b and Figure 14c It can be seen that the current on the radiator on the ant1 antenna is at least partially opposite to the current on the radiator on the ant2 antenna, thereby effectively improving the isolation between the two antennas.

[0107] like Figure 15a As shown, Figure 15a The figure shows the radiation pattern of the ant1 antenna at 0.82 GHz. The darker gray areas in the amplitude diagram represent stronger radiation, and the white areas represent weaker radiation. Figure 15b As shown, Figure 15b The figure shows the radiation pattern of the ant1 antenna at 0.88 GHz, where the darker gray areas in the amplitude diagram represent stronger radiation, and the white areas represent weaker radiation. Figure 15c As shown, Figure 15c The figure shows the radiation pattern of the ant2 antenna at 0.84 GHz, where the darker gray areas in the amplitude diagram represent stronger radiation, and the white areas represent weaker radiation.

[0108] To better understand the relationship between the ant1 antenna and the ant2 antenna provided in the embodiment of the present application. Figure 16 , Figure 16The transmission coefficient between ant1 and ant2 antennas is shown, where S21 is the transmission coefficient between ant1 antenna and ant2 antenna, which is given by Figure 16 It can be seen that the maximum transmission coefficient is -15; and the isolation between antennas is opposite to the transmission coefficient, so Figure 16 It can be seen that the isolation between the ant1 antenna and the ant2 antenna can reach more than 15dB.

[0109] Figure 17 The efficiency curves of the two antennas are shown. The solid line is the system efficiency and the dotted line is the radiation efficiency. When the efficiency of the ant1 antenna is -5dB, the corresponding frequency band bandwidth can reach more than 100MHz and the radiation efficiency is more than -3dB. When the efficiency of the ant2 antenna is -5dB, the corresponding frequency band bandwidth is 70MHz and the radiation efficiency is -2dB. Figure 17 It can be seen that the frequency bands of the ant1 antenna and the ant2 antenna are both within the radiation frequency band.

[0110] like Figure 18 As shown, the embodiment of the present application also provides a single-feed antenna, which is also a low-frequency antenna. Figure 18 The antenna includes a first radiator 10, a second radiator 20, and a feed source 60, wherein the first radiator 10 has a first feeding point a and a first grounding point b; the second radiator 20 has a second feeding point c and a second grounding point d; in addition, the antenna further includes a connecting line, the connecting line having a first end and a second end opposite to each other, the first end being connected to the first feeding point a of the first radiator 10, and the second end being connected to the second feeding point c of the second radiator 20; a feeding point e is provided on the connecting line, and the feeding point e is connected to the feed source 60; wherein, there is no other direct electrical connection between the first radiator 10 and the second radiator 20 except the connecting line. Figure 18 , both ends of the first radiator 10 are open ends, and the grounding point of the first radiator 10 is located between the two open ends. The second grounding point of the second radiator 20 is located at one end of the second radiator 20, and the other end of the second radiator 20 is an open end. Figure 18 As shown in , when the terminal has a metal frame, a plurality of openings are provided on the metal frame, and the plurality of openings divide the metal frame into a plurality of metal segments. For the convenience of description, the long side wall and the end side wall of the metal frame are defined, as shown in FIG. Figure 18 The direction of the straight line A is the length direction of the long side wall of the metal frame, and the direction of the straight line B is the short side wall direction of the metal frame. It should be understood that the metal frame has two opposite long side walls and two opposite short side walls. Figure 18 Only a portion of the metal frame is shown in the figure.

[0111] When the terminal adopts a metal frame, the first radiator 10 and the second radiator 20 are two different metal segments on the metal frame. Figure 18 As shown in , the first radiator 10 is a part of one of the long side walls, and the second radiator 20 is a part of the other long side wall. And the second grounding point d of the second radiator 20 is close to an open end of the first radiator 10. Figure 18 The ratio of the current path length of the first radiator 10 to the current path length of the second radiator 20 is greater than 2. For example, the current path length of the first radiator 10 is a metal segment of approximately 1 / 2 wavelength (the wavelength corresponding to the antenna's operating frequency band). Exemplarily, the current path length of the first radiator 10 is between 1 / 4 and 3 / 4 wavelength, such as 1 / 4 wavelength, 1 / 2 wavelength, and 3 / 4 wavelength. The first grounding point b of the first radiator 10 is located in the middle, with both ends open. The first radiator 10 is similar to the radiator structure of a T antenna. The current path length of the second radiator 20 is a metal frame of approximately 1 / 4 wavelength (the wavelength corresponding to the antenna's operating frequency band). Exemplarily, the current path length of the second radiator 20 is between 1 / 8 and 1 / 2 wavelength, such as 1 / 8 wavelength, 1 / 4 wavelength, and 1 / 2 wavelength. The second grounding point d of the second radiator 20 is located at the lower end of the second radiator 20, and the upper end of the second radiator 20 is open. The second radiator 20 can be similar to the radiator structure of an IFA antenna.

[0112] In an alternative embodiment, the first radiator 10 and the second radiator 20 may be arranged in other ways. For example, the first radiator 10 includes a portion of one long side wall and a portion of one short side wall; the second radiator 20 includes a portion of the other long side wall and a portion of the short side wall. In this case, the current path lengths of the first radiator 10 and the second radiator 20 are both 1 / 2 wavelength. In another alternative embodiment, the metal frame has two opposing long side walls and two opposing short side walls; the first radiator 10 is a portion of one of the long side walls; the second radiator 20 is a portion of the other long side wall. Increasing the spacing between the radiators: In this case, the current path lengths of the first radiator 10 and the second radiator 20 are approximately 1 / 4 wavelength. It should be understood that regardless of which of the above embodiments is used for the first radiator 10 and the second radiator 20, the first and second ends of the connecting wire are connected to the two long side walls in a one-to-one correspondence.

[0113] Continue to refer Figure 18 The antenna further includes a first feeding network, wherein the negative electrode of the feed source 60 is grounded, and the positive electrode of the feed source 60 is connected to the feed point e through the first feeding network. The feed point e is connected to a first metal wire 61, and the positive electrode of the feed source 60 is connected to the end of the first metal wire 61 away from the feed point e. The first feeding network includes a first capacitor 62 provided on the first metal wire 61. It should be understood that Figure 18The first feeding network shown in FIG is only an example. The feeding network provided in the embodiment of the present application may also include other structures. For example, when the end of the first metal wire 61 away from the feeding point e is further connected to the second metal wire and the third metal wire, and the ends of the second metal wire and the third metal wire away from the first metal wire 61 are grounded respectively, the first feeding network is Figure 18 In addition to the first capacitor 62, the first inductor is also provided on the third metal line, and the second inductor is provided on the second metal line. Figure 18 Although the feed source 60 is set in the middle position inside the mobile phone, the specific position of the feed source 60 is not limited in this application.

[0114] When the feed source 60 and the connecting line 50 are specifically set, the terminal has a circuit board, and the feed source 60 is set on the circuit board. The circuit board can be a PCB board 100, and the connecting line 50 can be a metal wire on the PCB board. Along the length direction of the short side wall, the first end and the second end of the connecting line 50 span the gap between the circuit board and the metal frame and connect to the two long side walls in the metal frame, that is, connect to the parts of the first radiator 10 and the second radiator 20 located on the long side walls in the metal frame, so as to achieve the connection between the connecting line 50 and the radiator. When specifically spanning, the connecting line 50 on the PCB board 100 can be connected to the first radiator 10 and the second radiator 20 through a metal wire or a metal layer.

[0115] For easier understanding Figure 18 The performance of the antenna in the simulation was simulated. Figure 19 Shows Figure 18 The antenna simulation's reflection coefficient curves show three resonant modes, with resonant frequencies near 0.82 GHz, 0.88 GHz, and 0.96 GHz. For comparison, a simulation stimulating only the left T-antenna yields only two resonances: common mode and differential mode. This significantly undermines the performance of the broadband, multi-mode architecture proposed in this application. Figure 20 The efficiency comparison of the two antennas is shown. The solid line is the system efficiency and the dotted line is the radiation efficiency. Figure 20 It can be seen that when the efficiency of this application is -5dB, the corresponding frequency band is 300MHz, and the radiation efficiency is above -2dB. When the efficiency of the T antenna on the left is -5dB, the corresponding frequency band bandwidth is 200MHz; the radiation efficiency is -3dB, so Figure 18 The antenna shown has a large bandwidth.

[0116] Combine Figure 19 The three frequency bands of this application are shown in FIG. Among them, the 0.82 GHz resonance is mainly generated by the right IFA antenna, and its current distribution is as follows Figure 21aAs shown in the figure, the current of the antenna in the frequency band of 0.82GHz flows in the second radiator 20 as follows: the current flows from the upper end of the second radiator 20 to the lower end. The 0.88GHz resonance is the common mode generated by the left T antenna, and its corresponding current flow direction is as follows: Figure 21b As shown: the current flows from both ends of the first radiator 10 to the connection between the first feed line 42 and the first radiator 10. The 0.96 GHz resonance is the differential mode generated by the left T antenna, and its corresponding current flow is as follows Figure 21c As shown, the current flows from the upper end to the lower end of the first radiator 10. The radiation patterns corresponding to the three resonant frequencies are as follows: Figure 22a As shown, Figure 22a The radiation direction of the antenna in the 0.82 GHz frequency band is shown; Figure 22b As shown in the figure, the radiation direction of the antenna in the frequency band of 0.88GHz; Figure 22c As shown in the figure, the radiation direction of the antenna in the 0.96GHz frequency band. Figure 22a 、 Figure 22b and Figure 22c In the amplitude diagram, the darker gray areas represent stronger radiation, and the white areas represent weaker radiation. Figure 22a and Figure 22b and Figure 22c It can be seen from the figure that the grayscale occupies most of the area in the radiation pattern, and the antenna of the present application has a good radiation effect at the three resonant frequencies.

[0117] From the above description, it can be seen that in the antenna provided by this application, for two radiators with different current path lengths, connected by the first feeding network, a single-feed broadband or multi-band antenna structure can generally be formed, which greatly improves the antenna free space or head-hand performance. This single-feed antenna is generally a low SAR structure due to its large aperture. Of course, it can also be Figure 18 The antenna shown is fed by a second feeding network, which can also achieve the same effect.

[0118] like Figure 23 As shown, Figure 23 Another example of a single-feed antenna is shown. Figure 23 The antenna in is a medium-high frequency antenna, having two IFA radiators (a first radiator 10 and a second radiator 20) of different lengths. The first radiator 10 and the second radiator 20 are both arranged at the bottom of the terminal, and the short side wall of the metal frame is used as the radiator. The first radiator 10 and the second radiator 20 are both grounded on the left side and open on the right side. The first radiator 10 and the second radiator 20 are a certain distance apart. The two radiators are fed through the second feeding network 30 to form a single-feed wide-band antenna. Figure 23In the embodiment, the connecting lines include a first connecting line 51 and a second connecting line 52. The first connecting line 51 is connected to the first radiator 10, and the second connecting line 52 is connected to the second radiator 20. The first connecting line 51 and the second connecting line 52 form a connecting "bridge" structure between the second feed network 30 and the two radiators. The end of the first connecting line 51 away from the first radiator 10 is connected to a fourth metal wire 64, and the end of the fourth metal wire 64 away from the first connecting line 51 is grounded. The end of the second connecting line 52 away from the second radiator 20 is connected to a fifth metal wire 65, and the end of the fifth metal wire 65 away from the second connecting line 52 is grounded. The positive electrode of the feed source 60 is connected to the fifth metal wire 65, and the negative electrode of the feed source 60 is connected to the fourth metal wire 64. The first connecting line 51 and the second connecting line 52 can be arranged symmetrically or asymmetrically. The fourth metal wire 64 and the fifth metal wire 65 can also be arranged symmetrically or asymmetrically.

[0119] In an optional solution, the antenna further includes a second matching network; the second matching network includes a third inductor 63, a fourth inductor 66 and a second capacitor 67; wherein the third inductor 63 is arranged on the fifth metal wire 65, the fourth inductor 66 is arranged on the fourth metal wire 64, and the second capacitor 67 is arranged between the first connecting wire 51 and the second connecting wire 52. The performance of the antenna is improved. By adjusting the inductance of the third inductor 63 or the fourth inductor 66, the deviation of the current path length from the feed source to the first radiator 10 and the current path length from the feed source to the second radiator 20 can be adjusted so that the two are equal. Figure 23 The second feeding network shown in the figure is only an example and may also include only the third inductor, or only the fourth inductor or other matching networks. In actual use, the inductor or capacitor can be selected as needed to form the required matching network.

[0120] right Figure 23 The antenna shown is simulated. Figure 24 The figure shows a set of reflection coefficient curves from the antenna simulation, which include three resonant modes with resonant frequencies near 2.01 GHz, 2.31 GHz, and 2.59 GHz. The 2.01 GHz resonance is primarily generated by the left IFA antenna. The 2.31 GHz resonance passes through the devices in the second feed network, and the left and right IFA antennas radiate together. The 2.59 GHz resonance is primarily generated by the right IFA antenna. Figure 25 The efficiency of the antenna is shown. The solid line is the system efficiency and the dotted line is the radiation efficiency. Figure 25 It can be seen that when the efficiency of this application is -5dB, the corresponding frequency band is 800MHz, and the radiation efficiency is above -2dB. Therefore, the antenna provided by the embodiment of this application has a large bandwidth. Figure 26a Shown Figure 23The current distribution of the antenna at 2.01 GHz shows that the current only flows in the first radiator 10 and flows from the suspended end of the first radiator 10 to the ground end. Figure 26b Shown Figure 23 The current distribution of the antenna at 2.31 GHz is shown. The current flows on the first radiator 10 and the second radiator 20, and both flow from the ground end to the suspended end. Figure 26c Shown Figure 23 The current distribution of the antenna at 2.59 GHz is shown. The current is only on the second radiator 20 and flows from the suspended end to the ground end. Figure 27a Shown Figure 23 The radiation pattern of the antenna shown at 2.01 GHz; Figure 27b Shown Figure 23 The radiation pattern of the antenna shown at 2.31 GHz; Figure 27c Shown Figure 23 The radiation pattern of the antenna shown in the figure is at 2.59GHz. In the above amplitude diagram, the darker gray areas represent stronger radiation, and the white areas represent weaker radiation. Figure 27a and Figure 27b and Figure 27c It can be seen from the figure that the grayscale occupies most of the area in the radiation pattern, and the antenna of the present application has a good radiation effect at the three resonant frequencies.

[0121] exist Figure 18 and Figure 23 The example uses a metal frame to support the first and second radiators. In addition to using a metal frame, a bracket can also be provided within the terminal housing to support the first and second radiators. For example, two opposing brackets are provided within the terminal; the first radiator is a metal layer provided on one bracket; the second radiator is a metal layer provided on the other bracket.

[0122] From the above description, it can be seen that in the antenna provided by this application, for two radiators with different electrical lengths, a single-feed broadband or multi-band antenna structure can be formed by connecting the feed source to the two radiators with different electrical lengths, which greatly improves the antenna's free space or head-hand performance. This single-feed antenna is generally a low SAR structure due to its large aperture. Of course, it can also be used in Figure 23 The antenna shown uses Figure 18 The same effect can be achieved by feeding with the feeding method shown in .

[0123] like Figure 28 As shown, Figure 28 This example shows a low-frequency antenna in a mobile phone. Figure 28 The antenna shown is Figure 2 The schematic diagram of the structure of the low-frequency antenna actually used in a mobile phone is shown in FIG. Figure 28 As shown, the left and right environments in actual mobile phones are asymmetric, and the antenna clearances are different, such as Figure 28 As shown, the SPK module 70 is located in the lower left corner of the phone, and the antenna SIM card module 80 is located in the lower right corner. The lower left and right corners of the phone refer to the corners of the phone near the corresponding end of the unlocking module. The first radiator 10 and the second radiator 20 of the antenna are each made of metal wire inside the phone case, such as the metal wire installed on the antenna bracket, or metal wire installed on the printed circuit board. The first radiator 10 and the second radiator 20 are located on the left and right sides of the phone, with the lower end grounded and the upper end suspended. Figure 28 The antenna is fed by the second feeding network 30 and the first feeding network 40. The second feed source 31 of the second feeding network 30 is connected to the first radiator 10 through the third feeding line 32, and is connected to the second radiator 20 through the fourth feeding line 33. Figure 28 In the embodiment, the third feed line 32 and the fourth feed line 33 can be arranged in a symmetrical manner or an asymmetrical manner. The specific arrangement can be determined according to the arrangement position of the second feed source 31. When the third feed line 32 and the fourth feed line 33 are arranged in an asymmetrical manner, the length of the current path transmitted from the second feed source 31 to the first radiator 10 and the second radiator 20 can be adjusted by setting a second matching network 39. The specific structure of the second matching network 39 and the second feed network 30 can be referred to. Figure 3 The first feeding network 40 is a symmetrical feeding network, and its specific structure can be referred to Figure 4 The relevant description in is not elaborated here. Figure 28 It can be seen that two antennas, anti-symmetric feeding ant1 and symmetric feeding ant2, can be generated.

[0124] like Figure 29 As shown, a low-frequency antenna is also provided. Figure 29 The numbers shown can refer to Figure 2 The relevant numbers in Figure 2 The difference between the antennas shown is that a phase shifter 90 is provided on the feeding line of the feeding network, and the phase shifter can be used to change the phase difference between the ant1 antenna and the ant2 antenna. Figure 29 In the embodiment, the phase shifter 90 is provided on the feeder line (the first feeder line or the second feeder line) of the first feed network 40. However, this application does not specifically limit the provision of the phase shifter to the antisymmetric feeder line and may also be provided on the second feed network 30. By adding the phase shifter 90 to the feeder line, the phase on the radiator can be changed by the phase shifter's direction, thereby improving the isolation that is damaged when the mobile phone is held.

[0125] An embodiment of the present application also provides a terminal, comprising a housing, and any of the above-mentioned antennas disposed within the housing. In the above technical solution, by using a first feeding network and a second feeding network to feed a first radiator and a second radiator having approximately equal current path lengths, the antenna isolation can be improved. When the first feeding network or the second feeding network is used to feed the first radiator and the second radiator having different current path lengths, the antenna bandwidth can be improved, thereby enhancing the antenna performance. The housing may be a metal housing, and the metal housing may include multiple metal segments, with the first radiator and the second radiator being two of the multiple metal segments. This facilitates antenna setup.

[0126] The above are only specific embodiments of the present application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. An antenna, applied to a terminal, characterized in that: It includes a first radiator, a second radiator and a feed source; At least one end of the first radiator is an open end, and the first radiator has a first grounding point and a first feeding point, and the first feeding point is located between the open end of the first radiator and the first grounding point; at least one end of the second radiator is an open end, and the second radiator has a second grounding point and a second feeding point, and the second feeding point is located between the open end of the second radiator and the second grounding point; The antenna further includes a connecting line, the connecting line having a first end and a second end opposite to each other, the first end being connected to a first feeding point of the first radiator, and the second end being connected to a second feeding point of the second radiator; a feeding point being provided on the connecting line, the feeding point being connected to the feed source; and no other direct electrical connection between the first radiator and the second radiator other than the connecting line; The terminal has a metal frame, which includes two opposite long side walls and a first short side wall connecting the two long side walls. The first radiator includes a portion of one of the long side walls, and the second radiator includes a portion of the other long side wall. At least one metal segment is arranged between the first radiator and the second radiator, and the metal segment is separated from the first radiator and the second radiator by a gap respectively. The metal segment includes at least a portion of the first short side wall and includes at least one grounding point.

2. The antenna according to claim 1, wherein The direction in which the first grounding point of the first radiator points to the first feeding point is opposite to the direction in which the second grounding point of the second radiator points to the second feeding point.

3. The antenna according to claim 1, wherein The first radiator is a portion of one of the long side walls, and the second radiator is a portion of the other long side wall.

4. The antenna according to claim 1, wherein The feed source includes a first feed source and a second feed source, and the connecting line includes a first feed line and a second feed line corresponding to the first feed source, and a third feed line and a fourth feed line corresponding to the second feed source; The first feed source, the first feed line, and the second feed line form a first feed network, and the second feed source, the third feed line, and the fourth feed line form a second feed network.

5. The antenna according to claim 4, characterized in that The antenna generates a first resonance when fed by the first feeding network, and generates a second resonance when fed by the second feeding network. The first resonance and the second resonance cover the same radiation frequency band of the antenna.

6. The antenna according to claim 4, wherein: The feeding point is connected to a first metal wire, and an end of the first metal wire away from the feeding point is further connected to a second metal wire and a third metal wire, wherein ends of the second metal wire and the third metal wire away from the first metal wire are grounded respectively; The negative electrode of the first feed source is grounded, and the positive electrode of the first feed source is connected to the feeding point through the first metal wire.

7. The antenna according to claim 6, characterized in that It also includes a first matching network, which includes a first capacitor, a first inductor and a second inductor. The first capacitor is set on the first metal line, the first inductor is set on the third metal line, and the second inductor is set on the second metal line.

8. The antenna according to claim 4, wherein: The connecting line between the feeding point and the first radiator is connected to a fourth metal line, and one end of the fourth metal line away from the connecting line is grounded; the connecting line between the feeding point and the second radiator is connected to a fifth metal line, and one end of the fifth metal line away from the connecting line is grounded; The cathode of the second feed source is connected to the fourth metal wire, and the anode of the second feed source is connected to the fifth metal wire.

9. The antenna according to claim 8, characterized in that It also includes a second matching network, which includes a second capacitor, a third inductor and a fourth inductor. The second capacitor is arranged at the feeding point, the third inductor is arranged on the fifth metal line, and the fourth inductor is arranged on the fourth metal line.

10. The antenna according to claim 1, wherein Both ends of the first radiator are open ends, and the second grounding point of the second radiator is located at the other end of the second radiator away from the open end.

11. The antenna according to claim 1, wherein The first radiator includes a portion of the first short side wall.

12. The antenna according to claim 1, wherein The second radiator includes a portion of the first short side wall.

13. The antenna according to claim 1, wherein The first end and the second end of the connecting line are connected to the two long side walls in a one-to-one correspondence.

14. The antenna according to claim 13, wherein: The terminal has a circuit board, and the feed source is arranged on the circuit board; Along the length direction of the first short side wall, the first end and the second end of the connecting line span the gap between the circuit board and the metal frame and are connected to the two long side walls of the metal frame.

15. The antenna according to any one of claims 1 to 14, characterized in that: The metal frame is provided with a plurality of openings, and the plurality of openings divide the metal frame into a plurality of metal segments; The first radiator and the second radiator are two different metal segments on the metal frame.

16. A terminal, characterized in that: The invention comprises a housing, and the antenna according to any one of claims 1 to 15 arranged in the housing. The terminal according to claim 16 , wherein: The housing is a metal housing, and the metal housing includes the metal frame.

Images