Dual frequency dual feed antenna and communication device

Abstract

The application discloses a dual-frequency dual-feed antenna and a communication device, and relates to the technical field of communication, which comprises a ring radiation structure, a waveguide structure, a first feed port and a second feed port, wherein the first feed port and the second feed port are used for exciting the ring radiation structure respectively, so that the same ring radiation structure generates two radiation modes with different resonance frequencies, and correspondingly radiates two electromagnetic waves with mutually orthogonal polarization directions. Compared with a traditional split dual-antenna scheme, the two modes of the application share the same radiation aperture, effectively breaking through the space limitation of an AP / FTTR product. The current distribution of the two modes is orthogonal and the polarization is orthogonal, realizing high-isolation coexistence under a compact physical layout and eliminating the multi-antenna mutual coupling problem. The electric field direction of one of the polarized waves is perpendicular to the wall surface, effectively improving the through-wall coverage capability; meanwhile, the dual-orthogonal polarization characteristics can reduce the polarization mismatch loss in the communication process.

Description

Technical Field

[0001] This application relates to the field of communication technology, and more particularly to a dual-frequency dual-feed antenna and communication equipment. Background Technology

[0002] Panel-mounted access points (APs) and FTTRs are characterized by their miniaturization. The small overall size limits the antenna layout and leaves little clearance around the antennas. Furthermore, with the development of Wi-Fi protocols, antenna specifications have increased, leading to a significant increase in the number of antennas. Panel-mounted APs and FTTRs often require the placement of multiple antennas operating on different Wi-Fi frequency bands. How to arrange multiple antennas operating on different frequency bands within a limited layout space, while ensuring good coexistence and minimizing inter-antenna coupling, is a major bottleneck in the development of current panel-mounted APs and FTTRs.

[0003] Meanwhile, traditional antenna designs are often vertically polarized. However, the antenna patterns of terminals used with panel APs and FTTR products are not purely vertically polarized, but rather exhibit hybrid polarization, meaning they contain both horizontal and vertical polarization components. Traditional purely vertically polarized antenna designs often suffer from polarization mismatch when paired with horizontally polarized / hybridly polarized terminals. Furthermore, the electric field vector trajectory of the emitted wave from a traditional vertically polarized antenna is parallel to the wall surface, resulting in significant losses. Therefore, traditional fully vertically polarized antenna designs have poor wall penetration performance. Utility Model Content

[0004] The main purpose of this application is to provide a dual-band dual-feed antenna and communication device, which aims to solve the technical problems of difficulty in coexistence of multi-band antennas and severe mutual coupling caused by crowded layout space in panel AP and FTTR products, as well as the poor wall penetration performance of traditional vertical polarized antennas.

[0005] To achieve the above objectives, this application proposes a dual-frequency dual-fed antenna, comprising: A circuit board having a first surface and a second surface disposed opposite to each other; A ring-shaped radiating structure is disposed on the first surface; A waveguide structure is disposed on the second surface, and the end of the waveguide structure passes through the circuit board and is electrically connected to the annular radiating structure. The first power supply port is located on the annular radiating structure; The second power supply port is located on the waveguide structure; The first feed port and the second feed port are used to excite the annular radiation structure so that the same annular radiation structure generates two radiation modes with different resonant frequencies and radiates electromagnetic waves with two mutually orthogonal polarization directions.

[0006] In one embodiment, the first feed port is a low-frequency feed port, which excites the annular radiation structure to operate in a first operating mode and radiates a low-frequency first polarization wave; The second feed port is a high-frequency feed port, which excites the annular radiation structure to operate in the second working mode and radiates a high-frequency second polarization wave that is orthogonal to the first polarization wave. And / or, when the first feed port is fed, the annular radiating structure operates in dipole mode; When the second feed port is powered, the annular radiating structure operates in ring antenna mode.

[0007] In one embodiment, the annular radiating structure includes a first ring and a second ring, with the first feed port bridging the first ring and the second ring.

[0008] In one embodiment, the first ring and the second ring are rectangular rings, each having a long side and a short side, and the first ring and the second ring are arranged side by side along the long side of the rectangular ring on the first surface; wherein, the first power supply port is connected across the middle of the adjacent short side of the first ring and the second ring.

[0009] In one embodiment, the outer long sides of the first ring and the second ring are the same length, while the inner long sides are different lengths. The lengths of the outer long sides of the first ring and the second ring are matched with the resonant points of the first operating mode, and the inner circumferences of the first ring and the second ring are matched with different resonant points of the second operating mode.

[0010] In one embodiment, the length of the outer long side of the first ring and the second ring is one-quarter of the wavelength corresponding to the resonant point of the first operating mode; The inner circumference of the first ring is the wavelength corresponding to the first resonant point of the second operating mode; The inner circumference of the second ring is the wavelength corresponding to the second resonant point of the second operating mode.

[0011] In one embodiment, the annular radiating structure further includes: At least two ring units are cascaded with the first / second ring.

[0012] In one embodiment, the waveguide structure includes: The first arm and the second arm are mirror-symmetrically arranged on the second surface, and the second power supply port is connected across the first arm and the second arm.

[0013] In one embodiment, the first arm and the second arm together form a parallel double-line waveguide structure. The end of the parallel double-line waveguide structure is vertically connected to four branches. The end of each branch away from the parallel double-line waveguide structure passes through the circuit board through a short-circuit via and is electrically connected to the first ring or the second ring.

[0014] In addition, to achieve the above objectives, this application also proposes a communication device, including a housing, circuit components and a dual-frequency dual-feed antenna as described above, wherein the dual-frequency dual-feed antenna is disposed inside the housing, and when the housing is installed on a wall, one of the electromagnetic waves radiated by the annular radiating structure is a vertically polarized wave and the other electromagnetic wave is a horizontally polarized wave.

[0015] One or more technical solutions proposed in this application have at least the following technical effects: This application utilizes a shared annular radiating structure, excited by a first feed port and a second feed port respectively, to generate two radiation modes with different resonant frequencies and mutually orthogonal polarization directions. Compared to traditional split dual-antenna schemes, both modes share the same radiating aperture, reducing antenna layout size and effectively overcoming the space limitations of panel AP / FTTR products. Thanks to the synergistic design of the annular radiating structure and the back waveguide structure, the current distributions of the two modes are naturally orthogonal. Combined with the polarization orthogonality of their radiated fields, high isolation is achieved in a compact physical layout, eliminating the problem of mutual coupling between multiple antennas. By mounting the antenna on a wall with the first and second surfaces perpendicular to the mounting surface, the electric field direction of one of the polarized waves is perpendicular to the wall. This polarized wave experiences less attenuation when penetrating the wall, effectively improving wall penetration coverage. Simultaneously, the dual orthogonal polarization characteristics can better match the random polarization direction of the terminal device, reducing polarization mismatch losses during communication, thereby improving connection stability and signal quality. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a structural diagram of a dual-frequency dual-fed antenna according to one embodiment of the present application; Figure 2 This is a structural diagram of a second embodiment of a dual-frequency dual-fed antenna provided in this application; Figure 3This is a structural diagram of a third embodiment of a dual-frequency dual-fed antenna provided in this application; Figure 4 This is a structural diagram of a fourth embodiment of a dual-frequency dual-fed antenna provided in this application; Figure 5 This is a current distribution diagram corresponding to the dipole mode of a dual-frequency dual-fed antenna according to this application; Figure 6 This is a directional shape diagram corresponding to the dipole mode of a dual-frequency dual-fed antenna according to this application; Figure 7 This is a polarization diagram corresponding to the loop antenna mode of a dual-frequency dual-fed antenna according to this application; Figure 8 This is a current distribution diagram corresponding to the loop antenna mode of a dual-frequency dual-fed antenna according to this application; Figure 9 This is a directional shape diagram corresponding to the loop antenna mode of a dual-frequency dual-fed antenna according to this application; Figure 10 This is a polarization diagram corresponding to the dipole mode of a dual-frequency dual-fed antenna according to this application; Figure 11 This is a simulation result diagram of the inter-port isolation of an embodiment of a dual-frequency dual-fed antenna according to this application; Figure 12 This is a reflection coefficient diagram of an embodiment of a dual-frequency dual-fed antenna according to this application; Figure 13 This is a structural diagram of a multi-ring cascaded embodiment of a dual-frequency dual-fed antenna according to this application; Figure 14 This is a current distribution diagram of a multi-ring cascaded embodiment of a dual-frequency dual-fed antenna according to this application; Figure 15 This is a directional shape diagram of a multi-ring cascaded dual-frequency dual-fed antenna embodiment of this application; Figure 16 This is a structural diagram of a communication device according to an embodiment of this application.

[0019] The reference numerals in the attached diagrams are as follows: 01. Annular radiating structure; 11. First ring; 12. Second ring; 02. Waveguide structure; 21. First arm; 22. Second arm; 03. First feed port; 04. Second feed port; 05. Circuit board; 06. First coaxial cable; 07. Second coaxial cable; 08. Short-circuit via; 09. Circuit assembly; 10. Housing.

[0020] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] It should be understood that the specific embodiments described herein are merely illustrative of the technical solutions of this application and are not intended to limit this application.

[0022] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0023] The main solution in this application embodiment is: This application proposes a dual-frequency dual-fed antenna, such as... Figure 1 and Figure 2 As shown, it includes: a circuit board 05 having a first surface and a second surface disposed opposite to each other; an annular radiating structure 01 disposed on the first surface; a waveguide structure 02 disposed on the second surface, the end of the waveguide structure 02 penetrating the circuit board 05 and electrically connected to the annular radiating structure 01; a first feed port 03 disposed on the annular radiating structure 01; and a second feed port 04 disposed on the waveguide structure 02; wherein the first feed port 03 and the second feed port 04 are respectively used to excite the annular radiating structure 01 so that the same annular radiating structure 01 generates two radiation modes with different resonant frequencies and correspondingly radiates two electromagnetic waves with mutually orthogonal polarization directions.

[0024] More specifically, panel access points (APs) and fiber-to-the-room (FTTR) terminal products, due to their miniaturized design and compact size, have extremely limited physical space available for antenna placement, resulting in insufficient clearance around the antennas. Meanwhile, to adapt to the ever-evolving Wi-Fi protocols with ever-increasing bandwidth and speed requirements, the antenna specifications required for these products are continuously improving, significantly increasing the number of antennas, and often necessitating the integration of multiple antennas operating in different Wi-Fi frequency bands (such as 2.4GHz, 5GHz, and 6GHz) within the same confined space. This coexistence of high-density, multi-band antennas presents a significant challenge: how to effectively arrange these antennas in such a crowded environment, ensuring their good coexistence and minimizing performance degradation caused by inter-antenna coupling, has become a critical bottleneck that urgently needs to be overcome in the development of current panel AP and FTTR products.

[0025] In terms of polarization matching, traditional panel access points (APs) and FTTR products generally employ vertically polarized antennas. However, the radiation patterns of the built-in antennas of various terminal devices used with them, such as smartphones, laptops, wireless network cards, and IoT devices, are not purely vertically polarized but exhibit hybrid polarization characteristics, containing both horizontal and vertical polarization components. Further complicating matters, the placement of the terminal device, such as a phone lying flat or standing upright, dynamically changes the polarization direction of its antenna relative to the AP. When a traditional purely vertically polarized AP antenna attempts to communicate with these terminal antennas that have horizontal polarization components or are in a non-vertical polarization state, a significant polarization mismatch problem occurs. This mismatch is essentially a polarization loss, which weakens the energy of the wireless signal during transmission, resulting in a decrease in received signal strength and directly affecting the stability and speed of communication.

[0026] Furthermore, the typical installation methods of panel APs and FTTR products—embedded in walls or closely attached to walls—introduce another critical issue: the strong attenuation effect of walls on wireless signals. Traditional vertically polarized antennas radiate electromagnetic waves whose electric field vector direction propagates parallel to the wall surface. When this polarization wave is incident on a wall medium with a high dielectric constant, it induces a strong current, resulting in significant signal energy loss and generally poor wall penetration / diffraction performance. In contrast, horizontally polarized electromagnetic waves have an electric field vector direction perpendicular to the wall surface, and the induced current generated when interacting with the wall is weaker. Therefore, their ability to penetrate walls or diffract is relatively stronger, and they can more effectively resist the attenuation effect of walls. Therefore, to improve the coverage capability of products in real-world deployment environments, especially to improve wall penetration performance, it is urgent to introduce antenna elements capable of effectively generating horizontally polarized radiation into existing antenna systems.

[0027] Currently, the mainstream technical approach in the industry to address the coexistence of multiple frequency bands and antennas is to physically space antennas operating at different frequencies as much as possible. This increases the spatial spacing between antenna elements to reduce mutual coupling and improve isolation. Simultaneously, specially designed isolation parasitic units, such as metal strips or resonant structures, are loaded between adjacent antennas to further suppress interference. However, the core drawback of this "space-spaced + isolation structure" method is its enormous demand for valuable layout space. Each antenna needs to occupy a relatively independent area, making space reuse and sharing impossible. This directly leads to difficulties in achieving a compact overall structure, creating a sharp contradiction with the size constraints of panel APs and FTTR products. With the increasing number of antennas, its application versatility is severely limited.

[0028] On the other hand, existing technologies also face their own challenges in realizing the required horizontally polarized antennas. Although horizontally polarized antennas can theoretically better match the mixed polarization state of the terminal and improve wall penetration performance, traditional methods for implementing such antennas, such as certain dipole or patch designs, often struggle to maintain performance while miniaturizing them. They generally suffer from low gain, narrow operating bandwidth, and relatively large physical size. These shortcomings directly contradict the core requirements of panel APs / FTTRs for high-performance, wide-bandwidth, and ultra-compact antennas. Therefore, seeking a new antenna design method or structure that can simultaneously achieve good horizontal polarization radiation characteristics within extremely limited space, and can be highly integrated and effectively coexist with vertically polarized antennas and other frequency band antennas, has become an important breakthrough and research direction for solving the above multiple challenges.

[0029] To address the aforementioned shortcomings, this application proposes a dual-band dual-fed antenna that utilizes a shared radiator structure and a dual-port feeding mechanism to simultaneously achieve polarized radiation in two mutually perpendicular directions within a compact space, while ensuring high isolation between the two. Its components include a supporting main circuit board 05, an annular radiating structure 01 located on the first surface of the circuit board 05, a waveguide structure 02 located on the other surface of the circuit board 05, and a first feed port 03 and a second feed port 04 corresponding to different frequency bands, respectively.

[0030] This can be understood as follows: circuit board 05 constitutes the physical foundation platform of the antenna, having a first surface and a second surface that are parallel to each other. The main radiating structure of the antenna is arranged on these two surfaces. Circuit board 05 provides the layout plane for the antenna components and determines their relative positional relationships. To clearly define its physical layout, this application introduces a spatial Cartesian coordinate system (e.g., X, Y, Z axes) and uses it to elaborate on the position, orientation, and function of each component. (See attached reference.) Figures 1-5 , Figure 8 as well as Figure 16 The coordinate system is defined as follows: the plane containing the first and second surfaces of circuit board 05 is defined as the XZ plane, and the thickness direction of circuit board 05 itself is the Y-axis direction. This coordinate system provides a reference for describing the polarization direction of the antenna.

[0031] The annular radiating structure 01, located on the first surface, is a multi-band shared radiator. The "annular" shape of the annular radiating structure 01, with its inner and outer rings, readily generates multiple resonant modes, providing a physical basis for dual-frequency operation. The annular radiating structure 01 is a ring-shaped structure unfolding in the XZ plane, and the physical path of its metallic conductor creates a pre-defined current path. When excited, current flows along this annular path. The dominant direction of current flow directly determines the polarization direction of the radiated electromagnetic wave. For example, if the long side of the ring is parallel to the X-axis, then when current flows along the line segment in the X-axis direction, it will primarily generate an electric field in the X direction. The waveguide structure 02 is disposed on the second surface of the circuit board 05, and this structure has a specific geometry in the XZ plane. Its key feature is that the end of the waveguide structure 02 penetrates the circuit board 05 in the Y-axis direction through a metallized via, achieving electrical connection with a specific point on the annular radiating structure 01 on the XZ plane. This via connects the structures on two different planes in the Y direction, forming a current path.

[0032] The first feed port 03 is directly disposed on the annular radiating structure 01. When a first frequency signal is injected through this port, it directly excites a current mode distributed in the XZ plane on the annular radiating structure 01. This current path determines one operating mode of the antenna. At this time, the annular radiating structure 01 acts as a planar resonator, and the polarization of its radiation field is determined by the dominant direction of the planar current. The second feed port 04 is disposed on the waveguide structure 02. When a second frequency signal is input from this port, a current is first generated on the waveguide structure 02 located on the second surface. This current flows along the waveguide structure 02 to the connecting via, then through the circuit board 05, and is injected into the annular radiating structure 01 on the first surface, thereby exciting a current mode that is completely different from the first feed port 03 and distributed in the XZ plane. This new current path is different from the first current path, thus generating another operating mode. Specifically, the physical lengths of the outer and inner ring paths of the annular radiating structure 01 are different. When the two ports inject current at different positions on the outer and inner ring paths, two operating modes with different current directions will be generated.

[0033] The most crucial point lies in the generation of polarization direction. The effective current direction of the current loop excited by the second feed path on the annular radiator is orthogonal to the current direction directly excited by the first feed port 03. For example, if the current excited by the first feed port 03 is mainly along the X-axis, then the current excited by the second feed port 04 will generate a current component mainly along the Z-axis on the annular radiator. The current excited by the first feed port 03 will radiate electromagnetic waves with an electric field direction along the X-axis, while the current excited by the second feed port 04 will radiate electromagnetic waves with an electric field direction along the Z-axis. When the antenna is mounted perpendicularly to the wall along the XZ plane, the polarized wave excited by the first feed port 03 along the X-axis is a vertically polarized wave; the polarized wave excited by the second feed port 04 along the Z-axis is a horizontally polarized wave.

[0034] This application utilizes a shared annular radiating structure 01. Driven by the first feed port 03, it operates in its first mode, radiating a first polarized wave. Driven by the second feed port 04, due to the different energy injection point and path, the radiator operates in a second mode, radiating a second polarized wave orthogonal to the first polarized wave. The two modes, with their naturally orthogonal current paths and separated operating frequency bands, coupled with the physical isolation of the ports located on opposite sides of the circuit board 05, achieve extremely high port isolation, effectively avoiding self-interference issues. Furthermore, by sharing the radiator and selecting the feed port, the radiating structures of the two antennas are integrated into one, successfully solving the challenges of multi-antenna coexistence, dual-band coverage, and dual-polarized radiation without increasing physical space requirements. This provides a high-performance antenna solution for miniaturized AP and FTTR devices. By mounting the antenna on the wall and making the first and second surfaces perpendicular to the mounting surface, the electric field direction of one of the polarized waves can be perpendicular to the wall. This polarized wave will experience less attenuation when penetrating the wall, effectively improving wall penetration coverage. At the same time, the dual orthogonal polarization characteristics can better match the random polarization direction of the terminal device, reducing polarization mismatch loss during communication, thereby improving connection stability and signal quality.

[0035] In one embodiment, the first feed port 03 is a low-frequency feed port, which excites the annular radiation structure 01 to operate in a first operating mode and radiates a low-frequency first polarized wave; the second feed port 04 is a high-frequency feed port, which excites the annular radiation structure 01 to operate in a second operating mode and radiates a high-frequency second polarized wave that is orthogonal to the first polarized wave.

[0036] This can be understood as the annular radiating structure 01 being an annular structure with an outer ring and an inner ring. At the same time, the circuit board 05 physically separates the annular radiating structure 01 from the waveguide structure 02, creating the prerequisite for effective electromagnetic isolation and distinct operating modes between the two.

[0037] In this embodiment, the first feed port 03 is a low-frequency feed port. When a low-frequency signal is injected through the first feed port 03, it directly excites a current mode distributed in the XZ plane on the annular radiating structure 01. The current flows along the outer ring path of the annular radiating structure 01, exciting the annular radiating structure 01 to operate in the first operating mode and radiating a low-frequency first polarized wave. The second feed port 04 is a high-frequency feed port. The second feed port 04 is connected to the waveguide structure 02 located on the second surface. The current flows along the waveguide structure 02 to the connection via, then through the circuit board 05, and is injected into the annular radiating structure 01 on the first surface, thereby exciting a current mode that is completely different from that of the first feed port 03 and distributed in the XZ plane. The current flows along the inner ring path of the annular radiating structure 01, exciting the annular radiating structure 01 to operate in the second operating mode and radiating a high-frequency second polarized wave that is orthogonal to the first polarized wave. Specifically, the first power supply port 03 operates in the 2.4-2.5 GHz frequency band, exciting 2.4G Wi-Fi radiation; the second power supply port 04 operates in the 5.15-5.85 GHz frequency band, exciting 5G Wi-Fi radiation.

[0038] The proposed design places the 2G and 5G antennas on the same circuit board (05), sharing the same radiator to generate radiation in two different frequency bands and the same radiating aperture. Compared to existing technologies, the overall antenna layout size is significantly reduced. Compared to traditional multi-antenna spacing layouts, the size is reduced by more than half.

[0039] In one embodiment, when the first feed port 03 is powered, the annular radiating structure 01 operates in dipole mode; when the second feed port 04 is powered, the annular radiating structure 01 operates in ring antenna mode.

[0040] In dipole mode, the current on the antenna flows in the same direction along a straight or nearly straight path. This current distribution pattern makes the entire antenna electrically equivalent to a classic dipole antenna. When a signal is fed in from a specific port, the current is excited and flows in phase and direction primarily along the longest, relatively straight part of the ring structure (i.e., the "long side"). The polarization direction of the radiated electromagnetic wave is determined by the direction of the current flow. The ring-shaped radiating structure 01 is a ring structure unfolded in the XZ plane, with the long side of the current flow along the X-axis. Therefore, in this mode, the antenna's polarization direction is along the X-axis.

[0041] In loop antenna mode, the current on the antenna flows in a closed loop. This mode fully utilizes the inherent characteristics of the loop structure, allowing it to function as a loop antenna. When a signal is fed from the second feed port 04 through the waveguide structure 02 on the back, the current is excited in a special way, causing it to flow in a loop primarily within the closed path inside the loop. At this point, the antenna behaves like a loop antenna. In a small loop antenna, its radiation characteristics are determined by the area of ​​the loop and the current flowing through it. The polarization direction of the radiated electromagnetic wave is perpendicular to the effective current direction in loop antenna mode. Since the effective radiator is the shorter side, and the shorter side of the current flow is along the Z-axis, the polarization direction in loop antenna mode is along the Z-axis, which is orthogonal to the X-axis polarization direction in dipole mode.

[0042] The two modes are independently controlled by different feed ports and do not interfere with each other. Ultimately, one physical antenna is transformed into two high-performance antennas with independent electrical performance, which solves the fundamental contradiction of the multi-antenna requirement of modern compact wireless devices.

[0043] In one embodiment, the annular radiating structure 01 includes a first ring 11 and a second ring 12, and a first power supply port 03 is connected across the first ring 11 and the second ring 12.

[0044] When fed through the first feed port 03, the antenna operates at low frequency, and the first loop 11 and the second loop 12 operate in dipole mode. The current distribution corresponding to the dipole mode is as follows: Figure 5 As shown, the current flows in the same direction along the long side of the ring. Due to the edge effect, the current mainly flows in the outer ring, and the total length of the flow path is 2*L. out Since Lout = 0.25*λ| fL Therefore, the total length of the current flow at this time is half a wavelength, and the antenna is equivalent to a 2.4 GHz half-wave dipole. The radiation pattern shape corresponding to the low-frequency dipole mode formed when the first feed port 03 is fed is as follows. Figure 6 As shown, it radiates omnidirectionally (when placed inside the housing, its radiation pattern is distorted by reflections from other circuit modules / hardware motherboards, becoming a peach shape). It's also important to note that the low-frequency antenna's polarization direction is along the X-axis; when the antenna is mounted perpendicularly to the wall along the XZ plane, this polarization is vertical. In summary, the antenna fed by the first feed port 03 is a low-frequency (2.4GHz) vertically polarized antenna, with both loops operating in dipole mode during feeding.

[0045] When fed through the second feed port 04, the antenna operates at a high frequency, and the first loop 11 and the second loop 12 operate in loop antenna mode, forming two resonant points f in the 5.15-5.85GHz frequency band. H1 and f H2The broadband effect is achieved through the combination of two resonant points. Figure 5 As shown. For the first loop 11, the total path length of the current circulation is 2*(W). in1 +L in1 )= λ| fH1 That is, the total path of the current circulation in the first ring 11 is f. H1 The corresponding wavelength is one time, therefore an f will be generated. H1 Resonance at a specific frequency; for the second ring 12, the current circulation path length is 2*(W) in2 +L in2 )= λ| fH2 That is, the total path of the current circulation in the second ring 12 is f. H2 The corresponding wavelength is one time, therefore an f will be generated. H2 Frequency resonance. The coordinated operation of two resonant points can broaden the operating bandwidth of the antenna.

[0046] When the second feed port 04 is powered, the currents on the long sides of the first ring 11 and the second ring 12 are distributed in opposite directions, so the resulting radiation will cancel each other out. The currents on the short sides of the first ring 11 and the second ring 12 are distributed in the same direction, so the resulting radiation will superimpose, forming high-gain radiation. When operating in ring mode, the short sides of the rings are the effective radiators of the antenna, and the long sides are the ineffective radiators. The radiation pattern formed by the antenna at this time is as follows: Figure 9 As shown, it is butterfly-shaped. It's also important to note that the polarization of a high-frequency antenna is determined by the direction of the current along the short side along the Z-axis. When the antenna is mounted perpendicularly to the wall along the XZ plane, this polarization is horizontal. In summary, the antenna fed by the second feed port 04 is a horizontally polarized antenna operating at a high frequency (5GHz), and both loops of the antenna operate in loop antenna mode during feeding.

[0047] In one embodiment, the first ring 11 and the second ring 12 are rectangular rings, each having a long side and a short side, and the first ring 11 and the second ring 12 are arranged side by side along the long side of the rectangular ring on the first surface; wherein, the first power supply port 03 is connected across the middle of the adjacent short side of the first ring 11 and the second ring 12.

[0048] This can be understood as follows: both the first ring 11 and the second ring 12 have a rectangular frame structure, each with two long sides and two short sides. The long sides of the first ring 11 and the second ring 12 are oriented along the X-axis, and the short sides are oriented along the Z-axis. The two rings are arranged side-by-side along the X-axis on the first surface of the circuit board 05, with one of their short sides adjacent. The side-by-side distribution of the long sides forms a continuous X-axis radiating surface, providing a symmetrical current path for the dipole mode. The adjacent short sides are the physical interface for low-frequency energy injection. The first feed port 03 directly spans and connects the adjacent short sides of the first ring 11 and the second ring 12, forming a "bridge" structure. When a low-frequency signal is input, the first feed port 03 simultaneously injects equal-amplitude, in-phase current into the adjacent short sides of the two rings. The current is split from the feed point along the adjacent short sides to both sides and synchronously introduced into the outer long sides of the two rings. When low-frequency current is injected from the port, due to the coupling between the two short sides through the feed point, the current forms a unidirectional flow path along the long sides of the outer rings. This path is equivalent to connecting the long sides of the two rings in series into a linear dipole with a total length ≈ λ / 2. The current is distributed in phase and at the same amplitude along the long sides of the two rings, and the radiation fields are coherently superimposed, suppressing the excitation of the inner ring current and preventing the accidental activation of high-frequency modes.

[0049] In one embodiment, such as Figure 3 As shown, the outer long side lengths of the first ring 11 and the second ring 12 are the same, while the inner long side lengths are different. The lengths of the outer long side lengths of the first ring 11 and the second ring 12 are matched with the resonant points of the first working mode, and the inner circumferences of the first ring 11 and the second ring 12 are matched with the different resonant points of the second working mode.

[0050] The length of the outer long side of the first ring 11 and the second ring 12 is one-quarter of the wavelength corresponding to the resonant point of the first working mode; the circumference of the inner ring of the first ring 11 is the wavelength corresponding to the first resonant point of the second working mode; the circumference of the inner ring of the second ring 12 is the wavelength corresponding to the second resonant point of the second working mode.

[0051] Specifically, the first feed port 03 is a low-frequency feed port, exciting the annular radiating structure 01 to operate in the first operating mode; the second feed port 04 is a high-frequency feed port, exciting the annular radiating structure 01 to operate in the second operating mode. This can be understood as the two rings having the same outer ring length, but different inner ring circumferences. The common outer ring circumference of the two rings is precisely matched to ensure effective resonance near the center frequency of the target low-frequency band; while their differentiated inner ring circumferences are independently matched to two specific resonant points (i.e., the first high-frequency resonant point and the second high-frequency resonant point) within the target high-frequency band. Specifically, the length L of the long side of the outer ring of the first ring 11 and the second ring 12... out They are the same, both equal to the low-frequency resonant point f. L One-quarter of the corresponding wavelength, i.e., L out = 0.25 * λ| fLThe lengths of the inner long sides of the first ring 11 and the second ring 12 are L respectively. in1 and L in2 The lengths of the shorter sides of the inner ring are W in1 and W in2 Among them, L in1 ≠L in2 And the circumference of the inner rings of the first ring 11 and the second ring 12 satisfies 2*(W in1 +L in1 )= λ| fH1 2*(W) in2 +L in2 )= λ| fH2 Where f H1 and f H2 These are the first high-frequency resonant point and the second high-frequency resonant point, respectively. It is this structure of a shared outer ring and differentiated inner rings that lays the physical foundation for the subsequent wide-band operation of dual resonances.

[0052] like Figure 5-7 As shown, when the first feed port 03 is excited, the current mainly flows along the outer edges of the first ring 11 and the second ring 12. The current flows in the same direction of rotation on both rings, with the current amplitude on the shorter side of the outer ring being smaller and alternating in direction, contributing little to the radiation. Therefore, the entire structure is equivalent to a dipole antenna, since the total length of the flow path is 2*L. out Because of L out =0.25*λ| fL Therefore, the total length of the current flow is half a wavelength, and the antenna is equivalent to a half-wave dipole. The currents in the same direction flow along the X-axis, generating a superimposed and enhanced electric field in the X-axis direction on the long side. The small-amplitude alternating currents on the short side cancel each other out due to their opposite directions. Therefore, the polarization direction of this mode is the X-axis direction.

[0053] like Figure 8-10 As shown, when the second feed port 04 is excited, current is injected into the inner ring of the double ring through the short-circuit via 08, forming a closed-loop path. On the long sides of the inner rings of the first ring 11 and the second ring 12, the current flows in opposite directions. The closed current path in the inner ring conforms to the working mechanism of a loop antenna, and its radiation efficiency depends on the effective magnetic moment formed by the current within the ring. The reverse current on the long side of the inner ring generates vertical electric fields with opposite directions and similar amplitudes, which significantly cancel out the vertical polarization components in far-field radiation due to phase cancellation. The current flowing in the same direction on the short side of the inner ring generates a superimposed and enhanced electric field in the Z-axis direction. Since the inner ring circumferences of the first ring 11 and the second ring 12 are different, they are excited at their matched high-frequency first resonant point and high-frequency second resonant point, respectively. At this time, the current mainly flows in a closed loop along the inner ring path of the ring, and the entire structure works together in loop antenna mode. The current flows along the Z-axis direction, therefore the polarization direction of this mode is the Z-axis direction. The current distribution corresponding to the loop antenna mode is as follows: Figure 8 As shown. For the first loop 11, the total path length of the current circulation is 2*(W). in1 +L in1 )= λ| fH1 That is, the total path of the current circulation in the first ring 11 is f. H1 The corresponding wavelength is one time, therefore an f will be generated. H1 Resonance at a specific frequency; for the second ring 12, the current circulation path length is 2*(W) in2 +L in2 )= λ| fH2 That is, the total path of the current circulation in the second ring 12 is f. H2 The corresponding wavelength is one time, therefore an f will be generated. H2 Frequency resonance. The coordinated operation of two resonant points can broaden the operating bandwidth of the antenna.

[0054] This embodiment utilizes the different circumferences of the inner rings of the first ring 11 and the second ring 12. These two different circumferences correspond to two similar but different resonant frequency points within the high-frequency band. When the second feed port 04 is excited, the double arms and the short-circuit via 08 structure effectively couple energy, simultaneously exciting these two resonant points. These two resonant points form two adjacent peaks in the frequency response, like two "humps," which together broaden the overall operating bandwidth of the high-frequency band.

[0055] In one embodiment, the annular radiating structure 01 further includes at least two ring units cascaded with the first ring 11 / second ring 12.

[0056] This can be understood as, for example Figure 13-15 As shown, this embodiment extends at least two ring units on the basic double-ring structure, achieving cascading through a shared inner conductor. Specifically, by cascading the ring units with the first ring 11 and the second ring 12, an equivalent antenna array can be constructed. Since the structure and perimeter of each ring unit are the same, the current flows in the same direction along the Z-axis in the annular radiating structure 01. At this time, the corresponding radiating arm of each ring unit can be regarded as an independent, in-phase excited radiation source. When the second feed port 04 is fed, the current forms closed loops with the inner ring of the first ring 11, the second ring 12, and the ring unit, respectively. The current flows in the same direction along the Z-axis to form an array, superimposing horizontally polarized waves to improve the antenna's gain performance.

[0057] In one embodiment, the waveguide structure 02 includes: The first arm 21 and the second arm 22 are mirror-symmetrically arranged on the second surface, and the second power supply port 04 is connected across the first arm 21 and the second arm 22. The first arm 21 and the second arm 22 together form a parallel double-line waveguide structure. The end of the parallel double-line waveguide structure is vertically connected to four branches. The end of each branch away from the parallel double-line waveguide structure passes through the circuit board 05 through the short-circuit via 08 and is electrically connected to the first ring 11 or the second ring 12.

[0058] This can be understood as follows: the first arm 21 and the second arm 22 are symmetrically arranged on the second surface along the X-axis. The first arm 21 and the second arm 22, as parallel metal strips of equal width and spacing, are set on the surface of circuit board 05, together forming a parallel double-line waveguide structure. The parallel double-line waveguide structure consists of parallel metal lines of equal width and spacing, constructing a transmission channel with constant characteristic impedance. This characteristic impedance value is achieved by precisely adjusting the line width and gap size to achieve a preset target. At the end of the waveguide structure, multiple stub structures are connected to the double-line terminal in a vertical orientation. The stubs, as impedance transformation carriers, use the same line width process as the parallel double lines to ensure the continuity of characteristic impedance. Each stub end penetrates the dielectric layer of circuit board 05 through a short-circuit via 08. The lower end of the via forms a three-dimensional electrical connection with the annular radiator. The location of this connection point needs to be determined through dynamic optimization using full-wave electromagnetic simulation.

[0059] The second feed port 04 bridges the first arm 21 and the second arm 22. When an RF signal is injected into the parallel bi-line waveguide through the second feed port 04, it propagates along the bi-line. The parallel bi-line maintains stable characteristic impedance through a balanced electric field distribution, and the ratio of its gap width to its linewidth directly determines the wave impedance value. When energy is transferred to the end of the waveguide, the stub structure plays a crucial role. Its quarter-wavelength physical length makes the stub an impedance inverter, transforming the amplitude of the end load impedance. The short-circuit via 08 acts as a vertical interconnect channel, penetrating the dielectric substrate to achieve interlayer energy coupling. Notably, the short-circuit via 08 is a metallized cylinder that vertically penetrates the dielectric layer of the circuit board 05. Its upper end connects to the end of the stub on the second surface, and its lower end is soldered to the first ring 11 / second ring 12 on the first surface. The via wall is fully metallized through a chemical copper plating / hole-filling process, forming a low-impedance current path. At the DC level, the potential of the via connection point is equal to the reference ground level, forming a current return closed loop; at the high-frequency level, the via exhibits low impedance characteristics in the target frequency band, making the connection point equivalent to an electromagnetic field node.

[0060] The entire power supply system achieves impedance matching through multi-level parameter coordination. The characteristic impedance maintained by the parallel twin lines serves as the system reference, and the quarter-wavelength characteristic of the stubs makes its input impedance inversely related to the load impedance. This transformation converts the complex impedance of the ring radiator into a controllable state. The positioning of the short-circuit via 08 becomes a key regulator for matching accuracy. By scanning the phase distribution of the inner current through full-wave simulation, a stable current amplitude region is selected as the connection point, ensuring that this location presents a preset target purely resistive impedance. Finally, the parallel twin lines transform the impedance again via a quarter-wavelength transmission line, converging to the standard system impedance value at the RF port. This distributed matching mechanism eliminates the need for traditional lumped element networks, completing the entire impedance transformation process at the structural level.

[0061] Specifically, the characteristic impedance of the parallel double-wire structure is Z. T = 100Ω, linewidth W of parallel double lines T and line spacing gap T The characteristic impedance requirement must be met. This impedance value is established based on transmission line theory; increasing the line width reduces the inductance per unit length, while reducing the gap increases the distributed capacitance. The combined effect of these two factors stabilizes the wave impedance in the hundreds of ohms range. At the bi-line termination, a vertically extending stub acts as an impedance conversion bridge, its characteristic impedance strictly consistent with the parallel bi-line, maintaining impedance continuity. The stub end penetrates the dielectric substrate through a metallized short-circuit via 08, forming a three-dimensional electrical connection with the inner wall of the annular radiator. This connection point is located at (L... T The selection of ( ) becomes a key adjustment variable for the system's matching accuracy. The connection point (L) between the short-circuit via 08 and the ring wall... T The system was dynamically optimized through full-wave electromagnetic simulation. When the connection point is located in the antinode region, the equivalent impedance approaches zero; when located in the node region, the impedance approaches infinity, both leading to matching failure. The load impedance at the connection point is 50Ω. RF energy is injected into the parallel bi-wire waveguide from the second feed port 04, transmitting while maintaining a characteristic impedance of 100Ω. Upon reaching the end, the stub structure inverts the 50Ω ring wall load to a 200Ω intermediate impedance. This impedance undergoes a second transformation via a λ / 4 parallel bi-wire, resulting in an impedance of 50Ω at the input to the second feed port 04, achieving good impedance matching. Notably, the second feed port 04 also uses a coaxial inner conductor-outer conductor connection to the first arm 21 and the second arm 22.

[0062] In addition, this application also proposes a communication device, such as Figure 16 As shown, the device includes a housing 10, a circuit assembly 09, and a dual-frequency dual-feed antenna as described above. The dual-frequency dual-feed antenna is located inside the housing 10, and the first surface / second surface is perpendicular to the mounting surface of the housing. When the housing is mounted on a wall, one of the electromagnetic waves radiated by the annular radiation structure 01 is a vertically polarized wave, and the other electromagnetic wave is a horizontally polarized wave.

[0063] In conjunction with the above embodiments, such as Figure 7 and 10 As shown, in low-frequency mode operation, when a low-frequency signal is injected through the first feed port 03, energy is directly applied to the adjacent edges of the first ring 11 and the second ring 12. At this time, the low-frequency resonant points of the first ring 11 and the second ring 12, with matching outer ring lengths, are excited. Since the feed point is located on the adjacent edge of the ring, the current mainly flows along the outer edge path of the two rings, forming a current distribution pattern similar to an extended dipole antenna. In this mode, the dominant current direction flows in the same direction along the long side of the first ring 11 and the second ring 12. Due to the edge effect, the current mainly flows along the outer edge of the ring, and the total length of the flow path is 2*L. out Because of L out = 0.25 * λ| fL Therefore, the total length of the current flow is half a wavelength, and the antenna is equivalent to a low-frequency half-wave dipole. The radiation pattern corresponding to the low-frequency dipole mode formed when the first feed port 03 is fed is as follows. Figure 6 As shown, it radiates omnidirectionally. It is worth noting that when placed inside housing 10, its radiation pattern is distorted by reflections from other circuit modules / hardware motherboards, becoming a peach shape. The polarization direction of the low-frequency antenna is along the X-axis. When the panel AP and FTTR are mounted vertically along the XZ plane, this polarization is vertical. Therefore, the antenna fed by the first feed port 03 is a low-frequency vertically polarized antenna, and the two rings of the antenna operate in dipole mode during feeding.

[0064] In high-frequency mode, when a signal is injected through the second feed port 04, energy is first applied to the first arm 21 and the second arm 22 on the back side. Current flows along the first arm 21 and the second arm 22 to their ends, where short-circuit vias 08 guide the current from the second surface to the first ring 11 and the second ring 12 on the first surface. The position and connection of these vias allow current to be injected into the inner ring region of the rings. Because the inner ring circumferences of the first ring 11 and the second ring 12 are different, they are each excited at their matching high-frequency first resonant point and high-frequency second resonant point. At this time, the current mainly flows in a closed loop along the inner ring path, and the entire structure operates in ring antenna mode. The current distribution corresponding to the ring antenna mode is as follows: Figure 8 As shown. For the first loop 11, the total path length of the current circulation is 2*(W). in1 +L in1 )= λ| fH1 That is, the total path of the current circulation in the first ring 11 is f. H1 The corresponding wavelength is one time, therefore an f will be generated. H1 Resonance at a specific frequency; for the second ring 12, the current circulation path length is 2*(W) in2 +L in2= λ|f H2 That is, the total path of the current circulation in the second ring 12 is f. H2 The corresponding wavelength is one time, therefore an f will be generated. H2 Resonance at a specific frequency point. For example... Figure 12 As shown, the two resonant points work together to broaden the antenna's operating bandwidth.

[0065] When the second feed port 04 is powered, the currents on the long sides of the inner rings of the first ring 11 and the second ring 12 are distributed in opposite directions, so the resulting radiation cancels each other out. The currents on the short sides of the inner rings of the first ring 11 and the second ring 12 are distributed in the same direction, so the resulting radiation superimposes, forming high-gain radiation. When operating in ring mode, the short sides of the rings are the effective radiators of the antenna, and the long sides are the ineffective radiators. The radiation pattern formed by the antenna at this time is as follows: Figure 9 As shown, it is butterfly-shaped. It's also important to note that the polarization of a high-frequency antenna is determined by the direction of the short-side current along the Z-axis. When the panel AP and FTTR are mounted perpendicularly to the wall along the XZ plane, this polarization is horizontal. Therefore, the antenna fed by the second feed port 04 is a horizontally polarized antenna operating at high frequencies, and the two loops of the antenna operate in loop antenna mode during feeding.

[0066] Throughout the operation, the first ring 11 and the second ring 12 of this scheme act as a shared radiator, serving both the low-frequency dipole mode and the high-frequency ring antenna mode. Low-frequency and high-frequency signals share the same physical aperture area for radiation. This fundamentally differs from traditional schemes where different frequency band antennas require their own independent layout areas, significantly compressing the overall antenna layout size and adapting to the stringent space constraints of panel AP / FTTR products. Simultaneously, the first feed port 03 and the second feed port 04 operate in different frequency bands, inherently isolating them. The low-frequency mode generates vertically polarized waves, and the high-frequency mode generates horizontally polarized waves; their polarization directions are perpendicular, reducing mutual interference. The low-frequency mode current mainly flows along the outer ring length, while the high-frequency mode current mainly flows along the inner ring; this non-interfering current path further reduces mutual coupling. Figure 11 As shown, these three orthogonal characteristics work together to achieve high isolation, better than -34dB, even when there is a high degree of physical overlap. This effectively eliminates the problem of mutual coupling between multiple antennas and is beneficial for antenna layout in high-specification panel APs and FTTRs.

[0067] In one embodiment, it further includes: The first coaxial line 06 is the coaxial line of the first feed port 03. The outer conductor and inner conductor of the first coaxial line 06 are respectively welded to the annular radiation structure 01. The second coaxial line 07 is the coaxial line of the second feed port 04. The outer conductor and inner conductor of the second coaxial line 07 are welded to the waveguide structure 02.

[0068] In conjunction with the above embodiments, such as Figure 6 and Figure 9 As shown, circuit component 09 is housed within housing 10, and its surface is perpendicular to the first / second surface, forming an L-shaped spatial configuration. This can be understood as the surface of circuit component 09 being parallel to the XY plane, reducing the motherboard's obstruction of antenna radiation. When the dual-band dual-feed antenna is placed inside housing 10, its radiation pattern will be distorted due to the reflection effect of circuit component 09. In dipole mode, the antenna's radiation pattern is peach-shaped, and in loop antenna mode, it is butterfly-shaped.

[0069] Furthermore, the first coaxial line 06 is the coaxial line of the first power supply port 03, the outer conductor of the first coaxial line 06 is welded to the center of the short side of the first ring 11, and the inner conductor of the first coaxial line 06 is welded to the center of the short side of the second ring 12; the second coaxial line 07 is the coaxial line of the second power supply port 04, the outer conductor of the second coaxial line 07 is welded to the first arm 21, and the inner conductor of the second coaxial line 07 is welded to the second arm 22.

[0070] In this embodiment, the first feed port 03 uses a first coaxial cable to connect the first ring 11 and the second ring 12. The inner and outer conductors of the coaxial cable form a two-wire transmission system, with a dielectric insulation layer filling the center. The outer conductor is welded to the center of the adjacent short side of the first ring 11, forming a current injection point, and the inner conductor is welded to the center of the adjacent short side of the second ring 12, forming a current return path. The welding point is located at the exact center of the gap between the two rings, ensuring that the feed structure is strictly symmetrical, and the welding distance between the inner and outer conductors is equal to the gap width of the short sides of the two rings. The inner and outer conductors are welded equidistantly and in opposite directions to the adjacent short sides of the two rings, forcing the injected current to flow into the two rings in opposite directions with equal amplitude. The outer conductor injects a reverse current (-I) into the first ring 11, and the inner conductor injects a forward current (+I) into the second ring 12. The welding point is located at the center of the short side, ensuring that the current is evenly distributed from the center point to both ends of the short side, avoiding phase distortion caused by edge effects. The inner conductor is directly welded to the metal body of the second ring 12, grounding the cable shielding layer to the radiator, significantly suppressing external electromagnetic interference coupling. When a signal is input, the outer conductor drives the short side of the first ring 11 to generate an upward current (along the +Z direction), while the inner conductor simultaneously drives the short side of the second ring 12 to generate a downward current (along the -Z direction). The short-side current is rapidly conducted to the long sides of the two rings, and due to the reverse current injection, a current flows along the -X direction on the long side. Similarly, the second feed port 04 connects the first arm 21 and the second arm 22 via the second coaxial cable 07.

[0071] The characteristic impedance of the first feed port 03 is 50Ω, to match the 50Ω RF circuit. 50Ω is the reference impedance in RF engineering, derived from the optimized balance of power capacity and loss of the coaxial cable. The antenna port impedance = 50Ω, which can be directly connected to the RF front-end circuit, avoiding signal reflection caused by impedance mismatch and insertion loss introduced by the additional matching network.

[0072] The above description is only a part of the embodiments of this application and does not limit the patent scope of this application. All equivalent structural transformations made under the technical concept of this application and using the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this application.

Claims

1. A dual-frequency dual-fed antenna, characterized in that, include: A circuit board having a first surface and a second surface disposed opposite to each other; A ring-shaped radiating structure is disposed on the first surface; A waveguide structure is disposed on the second surface, and the end of the waveguide structure passes through the circuit board and is electrically connected to the annular radiating structure. The first power supply port is located on the annular radiating structure; The second power supply port is located on the waveguide structure; The first feed port and the second feed port are used to excite the annular radiation structure so that the same annular radiation structure generates two radiation modes with different resonant frequencies and radiates electromagnetic waves with two mutually orthogonal polarization directions.

2. The dual-frequency dual-fed antenna as described in claim 1, characterized in that, The first feed port is a low-frequency feed port, which excites the annular radiation structure to operate in the first operating mode and radiates a low-frequency first polarization wave; The second feed port is a high-frequency feed port, which excites the annular radiation structure to operate in the second working mode and radiates a high-frequency second polarization wave that is orthogonal to the first polarization wave. And / or, when the first feed port is fed, the annular radiating structure operates in dipole mode; When the second feed port is powered, the annular radiating structure operates in ring antenna mode.

3. The dual-frequency dual-fed antenna as described in claim 2, characterized in that, The annular radiating structure includes a first ring and a second ring, with the first feed port bridging the first ring and the second ring.

4. The dual-frequency dual-fed antenna as described in claim 3, characterized in that, The first ring and the second ring are both rectangular rings, each having a long side and a short side, and the first ring and the second ring are arranged side by side along the long side of the rectangular ring on the first surface; wherein, the first power supply port is connected across the middle of the adjacent short side of the first ring and the second ring.

5. The dual-frequency dual-fed antenna as described in claim 4, characterized in that, The first ring and the second ring have the same length on their outer long side and different length on their inner long side. The lengths of the outer long side of the first ring and the second ring are matched with the resonant points of the first working mode. The inner circumferences of the first ring and the second ring are matched with different resonant points of the second working mode.

6. The dual-frequency dual-feed antenna as described in claim 5, characterized in that, The length of the outer long side of the first ring and the second ring is one-quarter of the wavelength corresponding to the resonant point of the first working mode; The inner circumference of the first ring is the wavelength corresponding to the first resonant point of the second operating mode; The inner circumference of the second ring is the wavelength corresponding to the second resonant point of the second operating mode.

7. The dual-frequency dual-fed antenna as described in claim 3, characterized in that, The annular radiating structure also includes: At least two ring units are cascaded with the first / second ring.

8. The dual-frequency dual-feed antenna as described in claim 1, characterized in that, The waveguide structure includes: The first arm and the second arm are mirror-symmetrically arranged on the second surface, and the second power supply port is connected across the first arm and the second arm.

9. The dual-frequency dual-feed antenna as described in claim 8, characterized in that, The first arm and the second arm together form a parallel double-line waveguide structure. The end of the parallel double-line waveguide structure is vertically connected to four branches. The end of each branch away from the parallel double-line waveguide structure passes through the circuit board through a short-circuit via and is electrically connected to the first ring or the second ring.

10. A communication device, characterized in that, The device includes a housing, circuit components, and a dual-frequency dual-feed antenna as described in any one of claims 1 to 9. The dual-frequency dual-feed antenna is disposed within the housing. When the housing is mounted on a wall, one of the electromagnetic waves radiated by the annular radiating structure is a vertically polarized wave, and the other electromagnetic wave is a horizontally polarized wave.

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