Resonant cavity antenna and communication terminal

Abstract

The present invention discloses a resonant cavity antenna and a communication terminal, which relate to the field of wireless communication technology. The resonant cavity antenna is placed in a casing, and includes: a dielectric layer structure, which is built into the hollowed-out right-angle edge of the casing, the dielectric layer structure has at least one side parallel to the right-angle edge of the casing, and an opening corresponding to the position of the dielectric layer is provided on the first side of the right-angle edge, so that the dielectric layer structure is exposed relative to the casing; an antenna structure, including a second radiator provided on the other side of the dielectric layer structure and a first radiator connected to the second radiator, the first radiator is located at the opening and exposed relative to the casing. The resonant cavity antenna of the present application, as a part of the casing structure, realizes an integrated connection between the antenna and the casing, does not occupy the internal space of the communication terminal, and ensures the electromagnetic wave transceiving performance of the antenna through the antenna structure, and has good radiation characteristics and impedance matching.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless communications, and in particular to a resonant cavity antenna and a communication terminal. Background Art

[0002] Currently, portable computers, tablet computers and other communication terminals often use metal casing structures, and the antenna structure is set inside the metal casing. However, the conductivity of the metal casing will strongly affect the radiation characteristics and impedance matching of the antenna, which may lead to reduced antenna efficiency, narrowed bandwidth or frequency shift. At the same time, the structure and limitations of the metal casing need to be considered when designing the antenna to ensure that the antenna and the metal casing can be tightly integrated.

[0003] It can be seen that how to reduce the influence of the metal casing on the antenna and ensure a certain integration effect is a problem that technical personnel in this field need to solve. Summary of the invention

[0004] The purpose of an embodiment of the present invention is to provide a resonant cavity antenna, which can use the antenna as a part of the casing structure to achieve an integrated connection between the antenna and the casing, does not occupy the internal space of the communication terminal, and ensures the electromagnetic wave receiving and transmitting performance of the antenna through the antenna structure, and has good radiation characteristics and impedance matching.

[0005] In order to solve the above technical problems, an embodiment of the present invention provides a resonant cavity antenna, which is placed in a housing and includes:

[0006] A dielectric layer structure is built into the hollowed-out right-angle edge of the housing, wherein at least one side of the dielectric layer structure is parallel to the right-angle edge of the housing, and an opening corresponding to the position of the dielectric layer is provided on a first side of the right-angle edge, so that the dielectric layer structure is exposed relative to the housing;

[0007] The antenna structure comprises a second radiator arranged on the other side of the dielectric layer structure and a first radiator connected to the second radiator, wherein the first radiator is located at the opening and exposed relative to the housing.

[0008] In some embodiments, the dielectric layer structure is a square structure of low-loss dielectric material, the dielectric layer structure has at least one right-angle surface abutting against the inner wall of the right-angle edge, and a first surface of the right-angle surface corresponds to the first edge.

[0009] In some embodiments, the housing is a square housing, the hollow area at the right-angle edge is a square structure corresponding to the dielectric layer structure, the dielectric layer structure is embedded in the hollow area, and the second surface of the right-angle surface abuts against the second side of the right-angle edge.

[0010] In some embodiments, the first radiator and the second radiator are metal patch structures, the first radiator is attached to the first surface, the second radiator is attached to the third surface of the dielectric layer structure, and the third surface is parallel to the shell of the housing.

[0011] In some embodiments, the first surface is parallel to the first edge, the first radiator attached to the first surface is parallel to the first edge, and the second radiator attached to the third surface is parallel to the housing.

[0012] In some embodiments, a bending strip extends from a side of the second radiator, the bending strip is attached to the dielectric layer structure, and expands to the opening to form the first radiator, and the first radiator and the second radiator are integrally connected.

[0013] In some embodiments, the first radiator is located within a corresponding range of the opening and is spaced apart from the housing.

[0014] In some embodiments, the width of the second radiator is smaller than the width of the third surface, and the width of the first radiator is smaller than the width of the first surface.

[0015] In some embodiments, the antenna structure also includes a signal introduction structure located at one end of the second radiator, the second radiator having an end portion of the signal introduction structure protruding from the dielectric layer structure, the signal introduction structure is integrally connected to the protruding portion of the second radiator, and the signal introduction structure extends toward the side where the dielectric layer structure is located until it extends to a shell close to the casing and is spaced apart from the shell.

[0016] In some embodiments, metal protrusions are provided at positions corresponding to the shell and the signal introduction structure. The metal protrusions are spaced apart from the signal introduction structure and are connected to external input signals at the spaced apart positions.

[0017] In some embodiments, the sidewall of the signal introduction structure abuts against the end of the dielectric layer structure to form a semi-enclosed structure in which the first radiator, the second radiator, and the signal introduction structure are respectively located on three different surfaces of the dielectric layer structure.

[0018] In some embodiments, the other end of the second radiator extends toward the inner wall of the second side of the right-angle edge and is in contact with and connected to the housing.

[0019] In some embodiments, the shell is provided with a protruding metal plane at the hollow area, a column structure is provided on the metal plane, the column structure penetrates the dielectric layer structure and extends toward the second radiator, and an end of the column structure is spaced apart from the second radiator.

[0020] In some embodiments, the outer structural surfaces of the housing, the dielectric layer structure and the antenna structure are coated with low-loss dielectric material.

[0021] A communication terminal comprises the resonant cavity antenna described above.

[0022] It can be seen from the above technical scheme that the beneficial effect of the present invention is that the dielectric layer structure is placed at the hollowed-out right-angle edge of the casing, and the antenna, as a part of the casing, does not occupy the internal space of the communication terminal. At the same time, the location of the hollowed-out area makes the communication terminal have the least wiring, which can avoid the influence of the antenna on the internal wiring of the communication terminal; due to the existence of the metal casing, the hollowed-out area at the right-angle edge can be regarded as a resonant cavity, so that the electromagnetic waves generated by the antenna structure resonate in the resonant cavity, and it is not necessary to occupy other positions of the communication terminal to form a resonant cavity antenna, thereby improving the electromagnetic wave radiation efficiency of the antenna structure. An opening corresponding to the dielectric layer is provided on the right-angle edge, and a first radiator is provided on the dielectric layer. The first radiator is exposed relative to the casing through the opening, thereby avoiding the influence of the metal casing on the electromagnetic waves. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A three-dimensional schematic diagram of the position of the resonant cavity antenna on the housing provided by an embodiment of the present invention;

[0025] Figure 2 A diagram showing the positional relationship between the dielectric layer structure provided by an embodiment of the present invention and the right-angle edge of the housing;

[0026] Figure 3 A schematic diagram of the three-dimensional structure of an antenna structure provided in an embodiment of the present invention;

[0027] Figure 4 A top view of the antenna structure provided by an embodiment of the present invention;

[0028] Figure 5 A right view of the antenna structure provided by an embodiment of the present invention;

[0029] Figure 6 A left view of the antenna structure provided by an embodiment of the present invention;

[0030] Figure 7 A schematic diagram of simulation of scattering parameters of a resonant cavity antenna provided in an embodiment of the present invention;

[0031] Figure 8 A schematic diagram of the simulation of the total working efficiency of the resonant cavity antenna provided in an embodiment of the present invention.

[0032] In the figure:

[0033] 1- housing; 11- first side; 111- opening; 12- second side; 13- shell; 2- dielectric layer structure; 21- first surface; 22- second surface; 23- third surface; 3- antenna structure; 31- first radiator; 32- second radiator; 33- bent strip; 34- columnar structure; 35- metal plane; 36- signal introduction structure; 37- metal protrusion. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0036] Next, a resonant cavity antenna provided by an embodiment of the present invention is introduced in detail. The resonant cavity antenna mainly involves using a resonant cavity structure to improve antenna gain and optimize antenna performance. The resonant cavity is a metal cavity that allows high-frequency electromagnetic waves to oscillate continuously within it; when the resonant frequency within the resonant cavity matches the antenna size, the electromagnetic waves generated by the radiator will be repeatedly reflected within the resonant cavity, generating a resonance phenomenon, thereby radiating energy outward.

[0037] Then the resonant cavity antenna first needs to have a cavity structure that forms a resonant cavity, and the cavity structure is usually a closed or semi-closed metal cavity structure. However, for the antenna, it is necessary to continuously send and receive signals during operation, so the resonant cavity in some embodiments should be a semi-closed structure to ensure that electromagnetic wave signals can be transmitted with the outside world through the semi-closed structure. The resonant cavity of this embodiment is a hollow area arranged inside the communication terminal casing 1; of course, the casing 1 of the communication terminal should be a metal casing 1, and have an opening 111 structure of a certain volume at the hollow area, thereby forming a semi-closed resonant cavity.

[0038] Specifically, the resonant cavity antenna of the present application is disposed in the housing 1, and the resonant cavity antenna includes a dielectric layer structure 2 and an antenna structure 3. The dielectric layer structure 2 serves as a supporting component of the antenna structure 3, and is built into the hollow area of ​​the right-angle edge of the housing 1. Figure 1 The casing 1 is usually used as the external structure of a communication terminal, generally adopting a regular square structure, such as a tablet computer, a portable computer, a mobile phone, etc., so the casing 1 has at least one right-angle edge, and the hollow area can be set at a suitable right-angle edge according to the actual distribution of components inside the casing 1.

[0039] It should be pointed out that the casing 1 usually includes two opposite flat shells 13, and a metal connecting structure is distributed on the periphery of the shell 13 to connect the two shells 13. The metal connecting structure can be an integral structure with the shell 13 or a split structure. No excessive restrictions are made here. For details, please refer to relevant technologies to ensure that the two opposite shells 13 can form a hollow casing 1 structure.

[0040] Other components such as circuit boards are also distributed in the hollow structure of the housing 1 to ensure the normal use of the communication terminal. The hollow area of ​​this embodiment is correspondingly set at the hollow structure of the housing 1. Of course, the setting of the hollow area does not affect the arrangement of other components in the housing 1. On this basis, the corresponding hollow area is set at the right-angle edge of the housing 1, and a resonant cavity structure wrapped by the metal housing 1 will be formed.

[0041] The dielectric layer structure 2 is correspondingly arranged at the hollow area, and at least one side of the dielectric layer structure is parallel to the right-angle edge of the casing 1. It should be noted that the right-angle edge of the casing 1 is composed of two right-angled sides. In this embodiment, the two right-angled sides are respectively recorded as the first side 11 and the second side 12. Of course, the first side 11 and the second side 12 are actually surface structures. The two sides are recorded here only to distinguish the first surface 21, the second surface 22, etc. on the dielectric layer structure 2, and there is no other literal meaning. The purpose of the dielectric layer structure 2 being parallel to a right-angled side of the casing 1 is to ensure that the radiator arranged on the dielectric layer structure 2 can be parallel to the casing 1, thereby changing the electric field distribution of the metal radiator to achieve a higher electromagnetic wave gain. At the same time, the parallel arrangement of the dielectric layer structure 2 is more convenient in terms of stability. For example, when the casing 1 and the dielectric layer structure 2 are abutted and fixed, the parallel arrangement can make the contact surface between the two larger, thereby improving the stability of the dielectric layer.

[0042] An opening 111 corresponding to the position of the dielectric layer structure 2 is provided on the first side 11 of the right-angle edge, so that the dielectric layer can be exposed through the metal housing 1. However, it should be noted that the opening 111 corresponding to the dielectric layer structure 2 is not necessarily completely corresponding, but can also be partially corresponding; that is, the opening 111 on the housing 1 only corresponds to a part of the structure of the dielectric layer structure 2, ensuring that the dielectric layer structure 2 can be exposed relative to the housing 1, so that the resonant cavity structure forms a semi-enclosed cavity structure with an opening 111 on one side.

[0043] The antenna structure 3 includes a second radiator 32 disposed on the other side of the dielectric layer structure 2 and a first radiator 31 connected to the second radiator 32. The other side here refers to the above-mentioned "the dielectric layer structure 2 has a side parallel to the right-angle edge of the housing 1", that is, the first radiator 31 is disposed on the side of the dielectric layer structure 2 parallel to the right-angle edge, which is recorded as the first surface 21 for the convenience of introduction; the second radiator 32 is disposed on the other side of the dielectric layer structure 2. The first radiator 31 is connected to the second radiator 32. At the same time, in some embodiments, the first radiator 31 is a high-frequency radiator and the second radiator 32 is a low-frequency radiator, thereby realizing a multi-frequency common antenna, that is, by connecting radiators of different frequencies, a single antenna can simultaneously support signal transmission of multiple different frequencies, which not only improves the flexibility and efficiency of the communication terminal, but also reduces the complexity and cost of communication.

[0044] In some embodiments, the first radiator 31 is arranged at the opening 111 of the first side 11, so that the first radiator 31 can be exposed relative to the casing 1, thereby avoiding the metal casing 1 from affecting the radiator's return loss, signal bandwidth, transceiver performance and other indicators. In addition, the metal casing 1 will also absorb the signal radiated by the radiator, especially on the grounded metal conductor and the large area metal conductor, which reduces the energy conversion efficiency of the communication system and affects the communication effect. The first radiator 31 of this embodiment can be exposed relative to the metal casing 1, thereby avoiding the above-mentioned problems and improving the radiation characteristics and impedance matching of the antenna.

[0045] In summary of the above embodiments, the resonant cavity antenna of the present invention places the dielectric layer structure 2 at the hollowed-out right-angle edge of the housing 1. As a part of the housing 1, the antenna does not occupy the internal space of the communication terminal. At the same time, the location of the hollowed-out area makes the communication terminal have the least wiring, which can avoid the influence of the antenna on the internal wiring of the communication terminal. Due to the existence of the metal housing 1, the hollowed-out area at the right-angle edge can be regarded as a resonant cavity, so that the electromagnetic waves generated by the antenna structure 3 resonate in the resonant cavity, and it is not necessary to occupy other positions of the communication terminal to form a resonant cavity antenna, thereby improving the electromagnetic wave radiation efficiency of the antenna structure 3. An opening 111 corresponding to the dielectric layer is provided on the right-angle edge, and a first radiator 31 is provided on the dielectric layer. The first radiator 31 is exposed relative to the housing 1 through the opening 111, thereby avoiding the influence of the metal housing 1 on the electromagnetic waves.

[0046] In some embodiments, the dielectric layer structure 2 is a square structure of a low-loss dielectric material, such as a lead glass material with a dielectric constant of six, including but not limited to lead glass material. The square dielectric layer structure 2 has a specific dielectric constant and thickness, which can ensure the stability and efficiency of electromagnetic waves when transmitted inside it, which is crucial to the performance of the antenna. By designing the size and material properties of the dielectric layer structure 2, effective control of the reflection and scattering of electromagnetic waves can be achieved, and the direction of the electromagnetic waves can be accurately controlled. At the same time, the hollow area at the right-angle edge of the casing 1 is also a square structure, and corresponds to the dielectric layer structure 2, so that a right-angle surface of the dielectric layer structure 2 is against the inner wall of the right-angle edge, that is, the first surface 21 in the right-angle surface corresponds to the first edge 11.

[0047] Please refer to Figure 2 , Figure 2 The position relationship diagram of the dielectric layer structure 2 and the right-angle edge of the housing 1 provided in the embodiment of the present invention shows that the first surface 21 and the second surface 22 of the dielectric layer structure 2 can respectively abut against the first edge 11 and the second edge 12 of the housing 1, so that the dielectric layer structure 2 is stably set in the hollow area.

[0048] Of course, the above-mentioned dielectric layer structure 2 and hollow area include but are not limited to square structures, and can also be columnar structures, that is, a columnar hollow area is set inside the housing 1, and the dielectric layer structure 2 is a corresponding columnar structure. However, for a flat housing 1, it is more difficult to set a columnar hollow area inside it than to set a square hollow area, but it is also achievable.

[0049] However, for square resonant cavities and cylindrical resonant cavities, their main differences lie in their geometric shapes and sizes, which directly affect their electromagnetic field distribution and resonant frequency. The choice of which type of resonant cavity structure to use depends on the specific application needs and the requirements of the electromagnetic field distribution, which will not be elaborated here.

[0050] Please refer to Figure 1 The first radiator 31 and the second radiator 32 are both metal radiating patch structures, the first radiator 31 is attached to the first surface 21, and the second radiator 32 is attached to the third surface 23 of the dielectric layer structure 2. It should be pointed out that the first surface 21 and the third surface 23 of the dielectric layer structure 2 are two perpendicular surfaces to each other, and the first radiator 31 and the second radiator 32 are radiator structures with different frequencies, thereby enhancing the directivity and adaptability of the antenna to different bands, and improving the efficiency and flexibility of wireless communication.

[0051] As for the metal radiation patch, it is usually a thin and long metal strip, which is responsible for capturing and radiating electromagnetic waves. The radiation patch is located on the surface of the dielectric layer structure 2, and the other surfaces of the dielectric layer structure 2 have a floor structure. For example, the side of the dielectric layer structure 2 opposite to the second radiator 32 has a housing 1. The housing 1 can be regarded as an overall floor structure, which forms a capacitive coupling with the radiation patch, so that a standing wave is formed between the metal radiation patch and the floor structure, resulting in the radiation of electromagnetic waves. And by adjusting the shape, size and characteristics of the metal radiation patch and the dielectric layer structure 2, precise control of the radiation efficiency and directivity can be achieved, thereby meeting specific communication or signal transmission requirements.

[0052] In addition, since the dielectric layer structure 2 adopts a square structure, there must be six faces as its second structure, the first face 21 is parallel to the first side 11, the second face 22 is parallel to the second side 12, and the third face 23 of the dielectric layer structure 2 is also parallel to the housing 1. On this basis, the first face 21 of the dielectric layer structure 2 is parallel to the first side 11, thereby ensuring that the first radiator 31 attached to the first face 21 is parallel to the first side 11, and the second radiator 32 attached to the third face 23 is parallel to the housing 1. The parallel arrangement of the radiator and the floor structure can make the electromagnetic wave distribution between the two more uniform, thereby improving the radiation efficiency of the antenna, and also helps to concentrate energy to radiate in a specific direction, enhancing the transmission efficiency of the signal. And by adjusting the distance between the radiator and the floor structure and their size and shape, the radiation mode of the antenna, that is, the propagation direction and intensity of the electromagnetic wave, can be accurately controlled. Combined with the resonant cavity structure, the resonance effect of the electromagnetic wave in the resonant cavity can be effectively enhanced.

[0053] At the same time, the radiator and the housing 1 are parallel to each other, which can save the internal space of the communication terminal as much as possible, thereby ensuring the compactness of the internal structure of the communication terminal.

[0054] In some embodiments, please refer to Figure 1 and Figure 3The first radiator 31 is a metal strip extending from the side of the second radiator 32, specifically, a bent strip 33 extending from the side of the second radiator 32, and the bent strip 33 extends toward the position of the opening 111 according to the shape of the dielectric layer structure 2, and when reaching the first surface 21 of the dielectric layer structure 2, extends along the surface of the first surface 21, thereby forming the first radiator 31 corresponding to the position of the opening 111; that is, the first radiator 31 is a continuation of the second radiator 32, and is arranged at the position of the opening 111 by extension.

[0055] In addition, the bending strip 33 is also attached to the surface of the dielectric layer structure 2, so that the first radiator 31 and the second radiator 32 are connected as a whole. Of course, this embodiment emphasizes that the first radiator 31 and the second radiator 32 can be electrically connected. As for whether they are in an integrated form, there is no restriction here. It can also be achieved by other electrical connection methods. It will not be repeated here. For details, please refer to the relevant technology.

[0056] Please refer to Figure 1 , the first radiator 31 is located within the corresponding range of the opening 111, that is, the first radiator 31 is located inside the range of the opening 111, and is spaced apart from the first side 11 forming the opening 111, so that the first radiator 31 is spaced apart from the casing 1. The casing 1 serves as a floor structure. In some embodiments, the floor structure can be electrically connected to the radiator. At this time, a continuous conductive path is formed between the floor structure and the radiator, which is conducive to signal transmission and radiation efficiency. In this case, the radiator and the floor structure work together, and through the above-mentioned resonant cavity structure and the setting method of the antenna structure 3, the electromagnetic wave signal can be effectively concentrated and emitted, thereby achieving better signal coverage and reception effects. However, the part where the radiator is connected to the casing 1 is not located on the first radiator 31, but specifically on the second radiator 32. The specific connection method will be explained below.

[0057] In some embodiments, the floor structure may not be electrically connected to the radiator, but the interaction between them will be weakened. However, under the action of the resonant cavity structure and the antenna structure 3, the electromagnetic wave can still be stably transmitted and received. In general, the electrical connection state between the radiator and the floor structure directly affects the performance of the antenna, including the transmission distance, coverage range, and reception quality of the signal, which can be set according to actual needs.

[0058] Please refer to Figure 1 and Figure 2, the width of the second radiator 32 should be smaller than the width of the third surface 23, and the width of the first radiator 31 should be smaller than the width of the first surface 21; on this basis, it helps to concentrate the energy of electromagnetic waves to radiate in a specific direction, thereby improving the directivity of the signal and further improving the communication quality. At the same time, the width of the radiator also determines the overall width of the antenna, that is, under the premise that the dielectric layer structure 2 serves as the supporting structure of the antenna structure 3, the width of the radiator is smaller than the width of the dielectric layer structure 2, then the overall contour structure of the antenna is similar to the contour structure of the dielectric layer structure 2; if the width of the radiator is too large or even larger than the width of the dielectric layer structure 2, it will invisibly increase the overall width of the antenna, making it difficult to maintain the portability and compactness of the communication terminal.

[0059] Please refer to Figure 3 In some embodiments, the antenna structure 3 further includes a signal introduction structure 36 located at one end of the second radiator 32, and the signal introduction structure 36 is used to connect an external input signal. The end of the second radiator 32 having the signal introduction structure 36 protrudes out of the dielectric layer structure 2, and the signal introduction structure 36 is electrically connected to the protruding portion of the second radiator 32. The other side of the signal introduction structure 36 extends toward the side where the dielectric layer structure 2 is located, and extends to the shell 13 close to the housing 1, and is spaced apart from the shell 13.

[0060] Since there are two housings 13 and they are arranged opposite to each other, the second radiator 32 is arranged close to one of the housings 13, and the signal introduction structure 36 extends toward the first housing 13. An external input signal is connected to the gap between the signal introduction structure 36 and the corresponding housing 13, and the signal introduction structure 36 converts the external input electrical signal into an electromagnetic wave signal, which enters the two radiators, thereby completing the characteristic of radiating outward.

[0061] As mentioned above, the housing 13 of the housing 1 can be used as a floor structure. Therefore, the radiation direction and strength of the signal can be optimized by adjusting the interval between the signal introduction structure 36 and the floor structure, so that the antenna can radiate electromagnetic waves more effectively, thereby improving the communication quality. At the same time, the appropriate interval setting helps to expand the bandwidth of the antenna, so that the antenna can work effectively in a wider frequency range and adapt to different communication needs.

[0062] In addition, please refer to Figure 4 and Figure 5A metal protrusion 37 is provided at the corresponding position of the housing 13 and the signal introduction structure 36. The metal protrusion 37 and the housing 13 can be regarded as an integral connection structure. The metal protrusion 37 and the signal introduction structure 36 are arranged at intervals, and the external input signal is connected at the interval. The shape and thickness of the metal protrusion 37 are not specifically limited here. It should be pointed out that since the size and thickness of the housing 13 in the existing communication terminal have a certain setting standard, in order to adaptively adjust the interval width between the signal introduction structure 36 and the floor structure, the metal protrusion 37 can be used as an intermediate transition structure here, so as to adapt to different communication requirements by adjusting the thickness and shape of the metal protrusion 37.

[0063] On the basis of the above embodiment, the side wall of the signal introduction structure 36 is also against the end of the dielectric layer structure 2, and the second radiator 32 and the first radiator 31 are also respectively attached to the two side surfaces of the dielectric layer structure 2, so that the first radiator 31, the second radiator 32, and the signal introduction structure 36 are respectively located on three different surfaces of the dielectric layer structure 2. The first radiator 31 and the second radiator 32 are attached to the dielectric layer structure 2, and the signal introduction structure 36 is against the end of the dielectric layer structure 2, so that the antenna structure 3 can half surround the dielectric layer structure 2, so that the dielectric layer structure 2 supports the antenna structure 3 more stably, and the performance and efficiency of the antenna are improved.

[0064] In some embodiments, the other end of the second radiator 32 extends toward the inner wall of the second side 12 of the right-angle edge and is in contact with the housing 1. Figure 2 It is pointed out above that the radiator can be electrically connected to the floor structure or not, and the electrical connection is achieved through the second radiator 32, that is, the end of the second radiator 32 can directly contact the first side 11. After the floor structure is electrically connected to the second radiator 32, the electromagnetic wave signal is effectively concentrated and emitted, thereby achieving better signal coverage and reception effect, which will not be described here in detail, and the details can be referred to the above embodiment.

[0065] Also, please refer to Figure 4 and Figure 6 In some embodiments, a protruding metal plane 35 is further provided on the housing 13 corresponding to the hollow area, and a column structure 34 is provided on the metal plane 35. The column structure 34 penetrates the dielectric layer structure 2 and extends toward the second radiator 32. The end of the column structure 34 is spaced apart from the second radiator 32. It can be seen that the metal plane 35 is provided on the housing 13 opposite to the second radiator 32. The metal plane 35 can be integrally connected to the housing 13, or can be electrically connected in other ways to ensure the stability of the connection between the two.

[0066] The column structure 34 is arranged in the middle of the dielectric layer structure 2, which can improve the isolation of the antenna, reduce the interference between electromagnetic waves of different frequencies of the antenna, and provide an effective reflection effect for the electromagnetic waves. At the same time, the arrangement of the column structure 34 can also position and install the dielectric layer structure 2, improve the installation accuracy of the dielectric layer structure 2 and the antenna, and thus ensure the communication performance of the antenna.

[0067] It should be noted that, in some embodiments, low-loss dielectric material can be applied to the outer structural surfaces of the casing 1, the dielectric layer structure 2 and the antenna structure 3. The low-loss dielectric material between the radiator and the casing 1 can be regarded as the dielectric layer structure 2. At the same time, the low-loss dielectric material on the outside of the casing 1 can separate the casing 1 from the grounding system, so that the casing 1 serves as another radiator in the radiator structure, thereby cooperating with the first radiator 31 and the second radiator 32 to form an antenna device larger than two radiators, thereby further improving the communication performance of the antenna.

[0068] Please refer to Figure 7 and Figure 8 , Figure 7 A schematic diagram of simulation of scattering parameters of a resonant cavity antenna provided in an embodiment of the present invention; Figure 8 A schematic diagram of the overall efficiency simulation of the resonant cavity antenna provided in an embodiment of the present invention. In an embodiment of the present invention, the embodiment can achieve a performance of an S11 (return loss coefficient) parameter less than -10dB in the WLAN (wireless local area network) frequency band of 2400MHz-2480MHz and the frequency band of 5150MHz-5875MHz, and an overall radiation efficiency greater than 80%, so that the resonant cavity antenna of this embodiment achieves good WLAN communication transceiver performance.

[0069] In addition, the present invention also discloses a communication terminal, including the above-mentioned resonant cavity antenna, so that the antenna is integrally connected to the housing 1 and does not occupy the internal space of the communication terminal. At the same time, the communication terminal has good radiation characteristics and impedance matching, and the structure is more compact, which greatly improves the portability and space utilization of the communication terminal.

[0070] The above is a detailed introduction to a retractable antenna device, namely a communication terminal, provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A resonant cavity antenna, characterized in that: Placed in the housing (1), comprising: A dielectric layer structure (2) is built into the hollowed-out right-angle edge of the housing (1); the dielectric layer structure (2) has at least one side surface parallel to the right-angle edge of the housing (1); and an opening (111) corresponding to the position of the dielectric layer is provided on a first side (11) of the right-angle edge, so that the dielectric layer structure (2) is exposed relative to the housing (1); An antenna structure (3) comprising a second radiator (32) disposed on the other side of the dielectric layer structure (2) and a first radiator (31) connected to the second radiator (32), wherein the first radiator (31) is located at the opening (111) and is exposed relative to the housing (1); The dielectric layer structure (2) is a square structure of a low-loss dielectric material, the dielectric layer structure (2) has at least one right-angled surface that abuts against the inner wall of the right-angled edge, and the first surface (21) of the right-angled surface corresponds to the first edge (11); The housing (1) is a square housing (1), the hollow area at the right-angle edge is a square structure corresponding to the dielectric layer structure (2), the dielectric layer structure (2) is embedded in the hollow area, and the second surface (22) of the right-angle surface abuts against the second side (12) of the right-angle edge; The first radiator (31) is attached to the first surface (21), and the first radiator (31) attached to the first surface (21) is parallel to the first edge (11); the second radiator (32) is attached to the third surface (23) of the dielectric layer structure (2), and the second radiator (32) attached to the third surface (23) is parallel to the housing (1).

2. The resonant cavity antenna according to claim 1, characterized in that: The first radiator (31) and the second radiator (32) are metal patch structures, and the third surface (23) is parallel to the shell (13) of the casing (1).

3. The resonant cavity antenna according to claim 2, characterized in that: The first surface (21) is parallel to the first edge (11).

4. The resonant cavity antenna according to claim 1, characterized in that: A bent strip (33) extends from a side of the second radiator (32); the bent strip (33) is attached to the dielectric layer structure (2) and extends to the opening (111) to form the first radiator (31); the first radiator (31) and the second radiator (32) are integrally connected.

5. The resonant cavity antenna according to claim 1, characterized in that: The first radiator (31) is located within a corresponding range of the opening (111) and is spaced apart from the housing (1).

6. The resonant cavity antenna according to claim 3, characterized in that: The width of the second radiator (32) is smaller than the width of the third surface (23), and the width of the first radiator (31) is smaller than the width of the first surface (21).

7. The resonant cavity antenna according to any one of claims 1 to 6, characterized in that: The antenna structure (3) further comprises a signal introduction structure (36) located at one end of the second radiator (32); the second radiator (32) has an end portion of the signal introduction structure (36) protruding from the dielectric layer structure (2); the signal introduction structure (36) is integrally connected to the protruding portion of the second radiator (32); and the signal introduction structure (36) extends toward the side where the dielectric layer structure (2) is located until it extends to a shell (13) close to the housing (1) and is spaced apart from the shell (13).

8. The resonant cavity antenna according to claim 7, characterized in that: A metal protrusion (37) is provided at a position corresponding to the housing (13) and the signal introduction structure (36); the metal protrusion (37) and the signal introduction structure (36) are spaced apart and connected to an external input signal at the spaced apart position.

9. The resonant cavity antenna according to claim 7, characterized in that: The side wall of the signal introduction structure (36) abuts against the end of the dielectric layer structure (2) to form a semi-enclosed structure in which the first radiator (31), the second radiator (32), and the signal introduction structure (36) are respectively located on three different surfaces of the dielectric layer structure (2).

10. The resonant cavity antenna according to claim 7, characterized in that: The other end of the second radiator (32) extends towards the inner wall of the second side (12) of the right-angle edge and is in contact with and connected to the housing (1).

11. The resonant cavity antenna according to claim 7, characterized in that: The housing (13) is provided with a protruding metal plane (35) at the hollowed-out area, and a column structure (34) is provided on the metal plane (35); the column structure (34) penetrates the dielectric layer structure (2) and extends toward the second radiator (32); an end of the column structure (34) is spaced apart from the second radiator (32).

12. The resonant cavity antenna according to claim 7, characterized in that: The outer structural surfaces of the casing (1), the dielectric layer structure (2) and the antenna structure (3) are coated with a low-loss dielectric material.

13. A communication terminal, characterized in that: The resonant cavity antenna comprises any one of claims 1-12.

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